107-02-8Relevant articles and documents
UV/Vis/near-IR spectroscopic characteristics of H4-xCsxPVMo11O40 (x = 0, 2) catalyst under different temperatures and gas atmospheres
Melsheimer,Kroehnert,Ahmad,Klokishner,Jentoft,Mestl,Schloegl
, p. 2398 - 2408 (2002)
In order to understand the transformations of the Keggin-type H4-xCsxPV-Mo11O40 (x = 0, 2) compounds with rising temperature over a long time in a stream of different gas atmospheres, in situ UV/Vis/near-IR spectroscopic studies were carried out. Diffuse reflectance spectra were recorded using an improved spectrometer and a suitable microreactor. Visible and near-IR peak intensities, peak positions and the band gap energies were determined from apparent absorption spectra. Propene, isopropanol, water and the oxidation products were analyzed by GC. The experimentally observed blue shift of the visible absorption band in the region of crystal water loss and the increase in the near-IR absorption were explained on the basis of quantum-mechanical calculations of the shapes and positions of the charge transfer and d-d bands arising from Mo5+-Mo6+ and V4+-Mo6+ pairs in intact and ill-defined fragments of the Keggin structure. It was concluded that with removal of crystal water during the action of He, He/H2O, propene, O2/propene and increasing temperature, reduced species with protons located at the bridging oxygens promote a blue shift of the visible band, while a large number of ill-defined species form the near-IR part of the spectra in the temperature range 326-600 K.
Catalytic amination of glycerol with dimethylamine over different type ofheteropolyacid/Zr-MCM-41 catalysts
Ding, Jianfei,Cui, Mingyu,Ma, Tianlin,Shao, Rong,Xu, Wei,Wang, Pengfei
, p. 51 - 58 (2018)
The effect of different type of heteropolyacid/Zr-MCM-41 catalysts on the catalytic amination of glycerol with dimethylamine to produce Dimethylamino-3-propanal was researched. Under the premise of their respective optimum loading amount, the specific sur
Selective acceptorless dehydrogenation and hydrogenation by iridium catalysts enabling facile interconversion of glucocorticoids
Ngo, Anh H.,Adams, Michael J.,Do, Loi H.
, p. 6742 - 6745 (2014)
An iridium(III) pentamethylcyclopentadienyl catalyst supported by 6,6'-dihydroxy-2,2'-bipyridine displays exquisite selectivity in acceptorless alcohol dehydrogenation of cyclic α,β-unsaturated alcohols over benzylic and aliphatic alcohols under mild aqueous reaction conditions. Hydrogenation of aldehydes and ketones occurs indiscriminately using the same catalyst under hydrogen, although chemoselectivity could be achieved when other potentially reactive carbonyl groups present are sterically inaccessible. This chemistry was demonstrated in the reversible hydrogenation and dehydrogenation of the A ring of glucocorticoids, despite the presence of other alcohol/or carbonyl functionalities in rings C and D. NMR studies suggest that an iridium(III) hydride species is a key intermediate in both hydrogenation and dehydrogenation processes.
Highly efficient VOχ/SBA-15 mesoporous catalysts for oxidative dehydrogenation of propane
Liu, Yong-Mie,Cao, Yong,Zhu, Ka-Ke,Yan, Shi-Run,Dai, Wei-Lin,He, He-Yong,Fan, Kang-Nian
, p. 2832 - 2833 (2002)
Highly dispersed vanadia species on SBA-15 mesoporous silica have been found to exhibit a highly efficient catalytic performance for the oxidative dehydrogenation (ODH) of propane to light olefins (propene + ethylene).
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Vaidya
, (1929)
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Sustainable acrolein production from bio-alcohols on spinel catalysts: Influence of magnesium substitution by various transition metals (Fe, Zn, Co, Cu, Mn)
Auroux, Aline,Dubois, Jean-Luc,Folliard, Vincent,Marra, Livia,Postole, Georgeta
, (2020)
Acrolein is a widely used intermediate of synthesis for value-added compounds in a number of domains of application. This work reports on the sustainable synthesis of acrolein by oxidative coupling of bio-alcohols, which constitutes a very promising alternative to fossil fuel-based production. The synthesis is performed in two sequential reactors, using an iron molybdate catalyst for oxidation and then a magnesium aluminate spinel where magnesium is partly or totally substituted by transition metals (Fe, Zn, Co, Cu, Mn) as a catalyst for cross-aldolization. The acid-base properties of the latter catalysts were determined using SO2 and NH3 adsorption microcalorimetry. Adsorption microcalorimetry was also used to study the adsorption properties of the reactants, with formaldehyde, acetaldehyde and propionaldehyde as probe molecules, and was complemented by a FT-IR investigation of reactant adsorption in order to better understand the mechanisms of adsorption and reaction. Acrolein production was found to be correlated to the ionic radius of the transition metals used in the catalysts, indicating that electronic effects are likely a factor influencing the acrolein production.
Photooxidation of propene by molecular oxygen over FSM-16
Yoshida, Hisao,Murata, Chizu,Inaki, Yoshitaka,Hattori, Tadashi
, p. 1121 - 1122 (1998)
Mesoporous silica (FSM-16) was found to exhibit a much higher activity for propene photooxidation than amorphous silica and to give different products distribution from those on silica, thus proposing FSM-16 as a new type of photooxidation catalyst.
Synthesis of fibrous nano-silica-supported TEMPO and its application in selective oxidation of alcohols
Zhu, Jie,Zhao, Xue-Jing,Wang, Peng-Cheng,Lu, Ming
, p. 1505 - 1507 (2013)
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A new and convenient method for the preparation of aldehydes by oxidation of primary alcohols with chromium trioxide in dimethyl sulfoxide
Lou,Lou
, p. 767 - 772 (1992)
A new and convenient method is described to oxidize primary alcohols into the corresponding aldehydes utilizing chromium trioxide-dimethyl sulfoxide system.
Characterization and reactivity of 11-molybdo-1-vanadophosphoric acid catalyst supported on zirconia for dehydration of glycerol to acrolein
Viswanadham, Balaga,Srikanth, Amirineni,Chary, Komandur V. R.
, p. 445 - 454 (2014)
A series of vanadium-substituted phosphomolybdic acid (HPA) catalysts supported on zirconia were prepared by impregnation method with varying the HPA active phase content from 10 to 50 wt% on the support. The calcined catalysts were characterized by X-ray diffraction, Raman spectroscopy, temperature-programmed desorption of NH3, FT-IR spectra of pyridine adsorption and surface area measurements. XRD results suggest that the active phase of heteropolyacid is present in a highly dispersed state at lower loadings and as a crystalline phase at higher HPA loadings and these findings are well-supported by the results of FT-IR and Raman spectra. Calcination of the samples did not affect the Keggin ion structure of HPA. The ammonia TPD results suggest that acidity of the catalysts was found to increase with increase of HPA loading up to 40 wt% and decreases at higher loadings. FT-IR spectra of pyridine adsorption show that the Bronsted acidic sites increase with increase of HPA loadings up to 40 wt% catalyst. However, Lewis acid sites decrease with increase of HPA loading. Catalytic properties were evaluated during vapour phase dehydration of glycerol to acrolein. The catalyst with 40 wt% HPA has exhibited excellent selectivity towards acrolein formation with complete conversion of glycerol at 225°C under atmospheric pressure. Catalytic performances during dehydration of glycerol are well-correlated with acidity of the catalysts.
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Gritter,Wallance
, p. 1051 (1959)
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IMPROVEMENT OF PROPERTIES OF CATALYST FOR INDUSTRIAL PRODUCTION OF ACROLEIN FROM PROPYLENE
Machek, Jaroslav,Tichy, Josef,Martinec, Alexander,Svachula, Jiri
, p. 1536 - 1544 (1994)
The catalytic gas-phase oxidation of propylene on a multicomponent Mo-Co-Fe-Bi-K-O catalyst gives up to 85percent yield of acrolein and acrylic acid along with undesirable side products - formaldehyde and acetaldehyde.Effect of four factors have now been studied with the aim of suppressing of formation of the by-product viz. the effect of potassium content in the catalyst, that of final annelating temperature of the catalyst, and those of addition of other components (tungsten, nickel).It has been found that a charge in potassium content in catalyst affect distinctly its activity and also selectivity for products of total oxidation of propylene but does not practically affect the yields of formaldehyde and acetaldehyde.The yields of the said side products decreased with increasing annelating temperature, however, with concominant considerable decrease in the catalytic activity.Whereas a partial substitution of molybdenum atoms in the catalyst by tungsten atoms is accompanied by an increase in production of formaldehyde and acetaldehyde, some catalysts with nickel gave acrolein as the only aldehyde.
Highly dispersible and magnetically recyclable poly(1-vinyl imidazole) brush coated magnetic nanoparticles: An effective support for the immobilization of palladium nanoparticles
Pourjavadi, Ali,Safaie, Niloofar,Hosseini, Seyed Hassan,Bennett, Craig
, p. 1729 - 1736 (2016)
A heterogeneous recoverable catalyst was prepared via the complexation of palladium onto the surface of magnetic nanoparticles coated by a poly(1-vinyl imidazole) brush. The stable, active and reusable catalyst was proven to be highly active in aerobic oxidation of primary and secondary alcohols with excellent yields. Only 0.1 mol% of the catalyst was used to oxidize 1 mmol of primary and secondary alcohols. The catalyst was readily recovered and reused up to 10 times under the described reaction conditions without significant loss of activity.
Direct oxidative transformation of glycerol into acrylic acid over phosphoric acid-added WVNb complex metal oxide catalysts
Omata, Kaori,Matsumoto, Keeko,Murayama, Toru,Ueda, Wataru
, p. 435 - 437 (2014)
The addition of phosphoric acid to WNbO catalyst active for glycerol transformation to acrolein and to WVNbO catalyst active for direct transformation of glycerol to acrylic acid appreciably improved their catalytic performance. The phosphoric acid-added WNbO catalyst gave acrolein yield of 81.8%, and the phosphoric acid-addedWVNbO catalyst gave acrylic acid yield of 59.2% in the direct glycerol transformation. The improvement of the catalytic performance seems due to the increases of the acid amount and the Bronsted acidity.
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Voisenet
, p. 363,898 (1911)
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Bismuth molybdates prepared by solution combustion synthesis for the partial oxidation of propene
Farin, Benjamin,Monteverde Videla, Alessandro H.A.,Specchia, Stefania,Gaigneaux, Eric M.
, p. 11 - 17 (2015)
The solution combustion method (SCS) is demonstrated as an easy and fast alternative method allowing the synthesis of mixed oxides with thermally sensitive metals, still keeping a good control on their stoichiometry and phase composition. Bismuth molybdates with different theoretical Bi/Mo atomic ratios, namely α-Bi2Mo3O12, β-Bi2Mo2O9, and γ-Bi2MoO6 were synthesized by the SCS, fully characterized by XRD, Raman, SEM/EDX, BET and XPS analyses, and tested in the partial oxidation of propene to acrolein. The SCS method allowed obtaining crystalline catalysts with Bi/Mo atomic ratios close to the theoretical values and very good catalytic properties namely high propene conversion (from 13.4 to 23.4%) and acrolein selectivity (from 71.5 to 80.0%) at 425°C. A high purity of the SCS prepared bismuth molybdates was obtained by means of a subsequent calcination treatment. Such treatment did not alter the high catalytic activity of the catalysts, which slightly increased (from 12.3 to 25.5%), but induced a marked loss of acrolein selectivity (from 66.2 to 48.4%) at 425°C. This effect is due to a strong increase of the oxidation states of Mo and Bi and reduction of the specific surface area during the calcination.
Sustainable production of acrolein: Effects of reaction variables, modifiers doping and ZrO2 origin on the performance of WO 3/ZrO2 catalyst for the gas-phase dehydration of glycerol
Chai, Song-Hai,Tao, Li-Zhi,Yan, Bo,Vedrine, Jacques C.,Xu, Bo-Qing
, p. 4619 - 4630 (2014)
Zirconia-supported tungsten oxide (WO3/ZrO2 or WZ) is known as an efficient catalyst for selective acrolein (AC) production from gas-phase dehydration of glycerol (GL). Two catalysts (WZ-CP and WZ-AN) were prepared herein using, respectively, a ZrO(OH)2 hydrogel (ZrO(OH)2-CP) and its derived alcogel (ZrO(OH)2-AN) for a precursor of ZrO2. To optimize the reaction variables and improve the catalyst performance, the WZ-CP catalyst was employed to show the effects of (A) reaction variables (temperature, partial pressures of GL and H2O, and co-feeding H2 or O2); (B) catalyst modification with alkali and alkali earth metal ions (Na+, K+ and Mg 2+), or transition metals (Pt, Pd, Rh and Ni). The reaction at 315 °C always produced the highest AC selectivity, and this temperature was then used to investigate the effects of the other variables and catalyst modifications. Increasing the molar GL/H2O ratio led to lower AC selectivity and accelerated the catalyst deactivation. Introducing 4-8 kPa O2 to the reaction feed significantly reduced the catalyst deactivation rate but the AC selectivity was only slightly lowered. However, an addition of 4 kPa H2 produced almost no effect on the reaction. The modified catalysts performed no better during the reaction unless the modifier was Pt or Pd, whose catalytic stabilities in the O2-containing (4 kPa) feed were significantly higher and their selectivity for AC production slightly lowered. Working under the conditions optimized with WZ-CP, the WZ-AN catalyst offered a high AC yield (62-68%) for longer than 30 h, during which the GL conversion remained higher than 93%.
Selectivity Control in the Reaction of Allyl Alcohol Over Zeolite Y
Hutchings, Graham J.,Lee, Darren F.
, p. 2503 - 2504 (1994)
Allyl alcohol can be converted into hydrocarbons, acrolein and diallyl ether and control of product selectivity can be achieved by selection of the cation exchanged form of zeolite Y used as catalyst.
Karrer,Schick,Schwyzer
, p. 784 (1948)
Effect of potassium addition to the TiO2 support on the structure of V2O5/TiO2 and its catalytic properties in the oxidative dehydrogenation of propane
Courcot, Dominique,Grzybowska, Barbara,Barbaux, Yolande,Rigole, Monique,Ponchel, Anne,Guelton, Michel
, p. 1609 - 1617 (1996)
Vanadium oxide has been deposited by a grafting technique onto TiO2 anatase, both pure and doped with potassium [(1.2 and 2.5) atoms nm-2]. The V content varied between 0.1 and 20 atoms nm-2 [0.01-2 V2O5 monolayers (ML)]. The prepared samples were characterized by X-ray photoelectron spectroscopy (XPS), 51V magic-angle spinning (MAS) NMR and a surface potential (SP) technique and tested as catalysts in the oxidative dehydrogenation (ODH) of propane and propan-2-ol decomposition, a probe reaction for acid-base properties. From the XPS and SP data it has been inferred that VOx are located beside the K centres on the bare surface of TiO2 with the lower K content sample, whereas they cover the K-doped fraction of the surface for the sample with higher K content. Monomeric and polymeric VOx species and V2O5 were detected by 51V NMR on pure and K-doped catalysts. For the K-doped samples the polymeric species were observed only at high V content and new tetrahedral VOx species and traces of KVO3 appeared. It has been found that the presence of K on the TiO2 surface leads to (a) a decrease in the reducibility of the vanadia phase at low V content; (b) a decrease in the surface potential (electronic work function); (c) a decrease in acidity and increase in basicity and (d) a decrease in the total activity for ODH of propane. The pattern of the activity and selectivity changes with the total V content depends on the amount of K on the support surface: with K 2O5 ML. At higher K content, higher amounts of vanadium (> 1 ML) are required to obtain the same catalytic performance. Polymeric [VOx] species seem to be more active and selective in the ODH of propane than monomeric species or bulk V2O5.
High catalytic performance of MoO3-Bi2SiO 5/SiO2 for the gas-phase epoxidation of propylene by molecular oxygen
Pang, Yijun,Chen, Xiaohui,Xu, Chengzhi,Lei, Yangjun,Wei, Kemei
, p. 876 - 884 (2014)
MoO3-Bi2SiO5/SiO2 catalysts with a Mo/Bi molar ratio of 5, prepared by a two-step hydrothermal and simple impregnation method, were investigated for the epoxidation of propylene by O2 and characterized by XRD, N2 absorption-desorption isotherms, thermogravimetric analysis (TGA), temperature-programmed reduction, NH3 temperature-programmed desorption (TPD), and IR, Raman, and X-ray photoelectron spectroscopy (XPS). On MoO3-Bi2SiO 5/SiO2 with Mo/Bi=5 calcined at 723K, a propylene conversion of 21.99 % and a propylene oxide selectivity of 55.14 % were obtained at 0.15MPa, 673K, and flow rates of C3H6/O 2/N2=1/4/20cm3 min-1. XRD, IR spectroscopy, and XPS results show that Bi2SiO5 and MoO3 are crystalline nanoparticles. NH3-TPD results indicate that the surface acid sites are necessary for the high catalytic activity. The results of TGA and N2 absorption-desorption isotherms reveal that a reasonable calcination temperature is 723K. The reaction mechanism of propylene epoxidation on MoO3-Bi2SiO 5/SiO2 catalysis is hypothesized to involve an allylic radical generated at the molybdenum oxide species and the activation of O 2 at the bismuth oxide cations. A new sensation in epoxidation: We describe the probable synergistic effects of MoO3 and Bi 2SiO5 in propylene epoxidation. The reactive centers consist of nanoparticulate species of crystalline MoO3 to activate the propylene and bismuth oxide cluster cations to activate O2.
Silylation enhances the performance of Au/Ti-SiO2 catalysts in direct epoxidation of propene using H2 and O2
Kanungo,Keshri, Kumer Saurav,van Hoof,d'Angelo, M.F. Neira,Schouten,Nijhuis,Hensen,Chowdhury
, p. 434 - 444 (2016)
The effect of silylation on a series of Au/Ti-SiO2 catalysts for the direct epoxidation of propylene in the presence of H2 and O2 was studied. It was found that silylation significantly improved catalyst performance: propylene conversion, propylene oxide (PO) selectivity, and H2 efficiency increased. The extent of improvement depended on the Au and Ti content of the catalysts. The catalyst showing the best activity (Au(0.1)/Ti(1)-SiO2) exhibited an average PO formation rate of 121 gPO kgcat?1 h?1 and a PO selectivity of 92% at 473 K, while the catalyst having the maximum Au and Ti loading (Au(1)/Ti(5)-SiO2) showed the most significant improvement in performance with a 78% increase in the rate of PO formation upon silylation. The catalysts were characterized by contact angle measurements, FTIR, TGA, TEM, ICP-OES and these observations were used to elucidate the key factors governing the enhanced catalytic performance upon silylation. It was found that the silylated catalyst exhibited superior performance due to increased hydrophobicity, which aids product desorption, a decrease in acidic sites that are responsible for side-product formation, and a possible redistribution of the Au particles.
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de la Mare,Vernon
, p. 3679,3681,3683 (1954)
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Oxidation of Propene in the Gas Phase
Stark, Moray S.,Waddington, David J.
, p. 123 - 152 (1995)
A series of laboratory and modelling experiments on the oxidation of propene in the gas phase has been undertaken to determine conditions which give high yields of propene oxide.The conditions under which the experiments were conducted were 505 - 549 K and up to 4 bar pressure.It is proposed that propene oxide is formed from propene by reaction with several peroxy radicals including HO2 and CH3CO3.However, one of the more important radicals is hydroxypropylperoxy.Its reaction with propene, under these conditions (107) HOCH2CHO2CH3 + C3H6 -> HOCH2CHOCH3 + C3H6O is more important than concerted decomposition to formaldehyde and acetaldehyde.
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Maksorow,Andrianow
, p. 827 (1932)
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HETEROARYL DERIVATIVE, METHOD FOR PRODUCING SAME, AND PHARMACEUTICAL COMPOSITION COMPRISING SAME AS EFFECTIVE COMPONENT
-
, (2022/02/02)
The present invention relates to a 6-(isooxazolidin-2-yl)-N-phenylpyrimidin-4-amine derivative, and a pharmaceutical composition for preventing or treating cancer comprising the compound as an effective component. The compound exhibits high inhibitory activity against an epidermal growth factor receptor (EGFR) variant, or wild-type or variants of one or more of ERBB2 and ERBB4, and thus may be usefully used in the treatment of cancers in which same are expressed. In particular, the compound exhibits excellent inhibitory activity on proliferation of lung cancer cell lines, and can thus be usefully used in the treatment of lung cancer.
Novel Mo-V Oxide Catalysts with Nanospheres as Templates for the Selective Oxidation of Acrolein to Acrylic Acid
Wang, Weihua,Xu, Wenjie,Song, Weilin,Yang, Bin,Li, Li,Guo, Xuhong,Wu, Lianghua,Liu, Hongxing
, p. 2326 - 2338 (2021/01/11)
Abstract: Novel Mo-V-PMMA and Mo-V-PS catalysts are prepared by addition of hard polymethyl methacrylate (PMMA) and polystyrene (PS) nanospheres into Mo/V compounds in the preparation process, respectively. The catalytic tests in selective oxidation of acrolein reveal that Mo-V-PMMA catalyst shows very high acrolein conversion (99.1%) and the yield of acrylic acid (90.7%). The BET, DLS, SAXS, XRD, XPS, H2-TPR and NH3-TPD measurements reveal that the addition of PMMA and PS nanospheres causes the obvious changes of porous structure, crystal phases composition and chemical properties of catalysts. These differences between Mo-V-PMMA and Mo-V-PS catalysts are attributed to the totally different “real” nano–environment during heat treatment in the high–concentration component mixture. PS nanospheres are in a state of adhesion or agglomeration or not uniformly distributed in the active component solution, while PMMA nanospheres with much better hydrophilicity and monodispersed state promote Mo and V ions more easily and uniformly dispersed in the mixture. Graphic abstract: Novel Mo-V catalysts are prepared by addition of hard polymethyl methacrylate (PMMA) and polystyrene (PS) nanospheres into Mo/V mixture. Obvious changes of porous structure, crystal phases and chemical properties of catalysts are caused by the nanospheres introduction, showing very high acrolein conversion (99.1%) and the yield of acrylic acid (90.7%) in selective oxidation of acrolein.[Figure not available: see fulltext.].
Chemical Imaging of Mixed Metal Oxide Catalysts for Propylene Oxidation: From Model Binary Systems to Complex Multicomponent Systems
Sprenger, Paul,Stehle, Matthias,Gaur, Abhijeet,Wei?, Jana,Brueckner, Dennis,Zhang, Yi,Garrevoet, Jan,Suuronen, Jussi-Petteri,Thomann, Michael,Fischer, Achim,Grunwaldt, Jan-Dierk,Sheppard, Thomas L.
, p. 2483 - 2493 (2021/04/05)
Industrially-applied mixed metal oxide catalysts often possess an ensemble of structural components with complementary functions. Characterisation of these hierarchical systems is challenging, particularly moving from binary to quaternary systems. Here a quaternary Bi?Mo?Co?Fe oxide catalyst showing significantly greater activity than binary Bi?Mo oxides for selective propylene oxidation to acrolein was studied with chemical imaging techniques from the microscale to nanoscale. Conventional techniques like XRD and Raman spectroscopy could only distinguish a small number of components. Spatially-resolved characterisation provided a clearer picture of metal oxide phase composition, starting from elemental distribution by SEM-EDX and spatially-resolved mapping of metal oxide components by 2D Raman spectroscopy. This was extended to 3D using multiscale hard X-ray tomography with fluorescence, phase, and diffraction contrast. The identification and co-localisation of phases in 2D and 3D can assist in rationalising catalytic performance during propylene oxidation, based on studies of model, binary, or ternary catalyst systems in literature. This approach is generally applicable and attractive for characterisation of complex mixed metal oxide systems.
