50810-32-7Relevant articles and documents
Machida, Masato,Eguchi, Koichi,Arai, Hiromichi
, p. 385 - 393 (1987)
Evaluation of crystalline structure and SO2 storage capacity of a series of composition-sensitive De-SO2 catalysts
Wang,Chen,Limas-Ballesteros,Montoya,Dominguez
, p. 181 - 193 (2003)
A series of non-stoichiometric magnesium-aluminate solid solution spinels, used as sulfur-transfer catalysts in the fluid catalytic cracking units for SOx emissions abatement, were prepared by using coprecipitation method and characterized with BET, TGA, AES, XRD and in situ IR techniques. It was found that both the crystalline structures and De-SOx activities of magnesium-aluminate spinels are very sensitive to catalyst compositions. Several phase domains were produced by changing the mole ratio of alumina to magnesia in the preparation process. Owing to substitution of magnesium or aluminum ions in the spinel structure, that leads to a polarization of Al3+ or Mg2+ ions to adjacent oxygen lattices, the lattice cell parameter of spinel structure regularly varied with chemical compositions, producing a contraction or expansion effect in the lattice cell, that strongly affects De-SOx activity. TG analysis showed that during SO2 oxidative adsorption, most of sulfur species were captured on the surface and some sulfur species were stored in bulk of the solids. The IR and AES results confirmed that both surface and bulk-like sulfates with different H2-reducibilities were formed on the catalysts, which is in good agreement with results of SO2 monolayer adsorption measurement. Ten-cycle tests of SO2 oxidative adsorption and reductive decomposition of the formed sulfate showed that the sample with XAl = 0.33 is the optimum catalyst, its SO2 capturing capacity reached 124.4 mg/g.
The Influence of the Nature of the Support on the Copper-Palladium Catalysed Suzuki-Miyaura-Coupling
Fodor, Anna,Hell, Zoltán,Pirault-Roy, Laurence
, p. 596 - 608 (2016/02/26)
Copper-palladium bimetallic catalysts supported on mixed oxides (MgO)0.75(Al2O3)0.25 (MgAlO) were prepared with two step impregnation (TSI) and co-impregnation (CI). These materials were studied to determine the effect of the support on the activity and stability in the Suzuki-Miyaura reaction and on the properties of a catalyst. The catalyst prepared by CI was active and selective during 6 catalytic cycles in Suzuki coupling, whereas the activity of the catalyst prepared with TSI dropped at the sixth use. The kinetics of the reaction was examined along with its scope. The relationship between the basic properties of the support and the catalytic performances were examined too. The importance of the nature of the support was also studied by catalyst characterization methods. (Chemical Equation Presented).
One-pot synthesis of potassium-loaded MgAl oxide as solid superbase catalyst for Knoevenagel condensation
Zhao, Jin,Xie, Jun,Au, Chak-Tong,Yin, Shuang-Feng
, p. 33 - 37 (2013/09/02)
We report a new strategy for one-pot synthesis of potassium-loaded MgAl oxides using KOH to adjust the pH value of the reaction system. The as-prepared solid superbases were studied by N2 physisorption method, energy-dispersive X-ray spectrosco
