20292-08-4Relevant articles and documents
A novel poly(p-styrenesulfonic acid) grafted carbon nanotube/graphene oxide architecture with enhanced catalytic performance for the synthesis of benzoate esters and fatty acid alkyl esters
Bian, Gang,Jiang, Pingping,Zhang, Weijie,Jiang, Kelei,Hu, Ling,Jian, Zhang,Shen, Yirui,Zhang, Pingbo
, p. 90757 - 90765 (2015/11/16)
Considering the issue of low yield in the synthesis of benzoate esters and fatty acid alkyl esters, designing a high catalytic activity composite catalyst is very significant and attractive. In this study, the rational design strategy was used to develop a novel poly(p-styrenesulfonate acid, namely PSSF) grafted multi-walled carbon nanotube composite with graphene oxide nanomaterial (PSSF-mCNTs-GO) using a simple two-step method. FT-IR and Raman spectroscopy, XRD, SEM, TEM, and NH3-TPD were used to characterize the inorganic-organic hybrid material. In particular, the addition of GO remarkably enhanced its catalytic performance in the production of fatty acid alkyl esters (92.16%) and benzoate esters (90.27%), in which the conversion was more than doubled as a result of its strong π-π interaction with the substrate. In addition, PSSF-mCNTs-GO can be separated from the substrate conveniently and still maintained a relatively high catalytic activity even after 6 times recycling, which indicates its rather good reusability. This novel catalyst is promising in the synthesis of biodiesel and benzoate esters.
A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan
Jin, Junjiang,Zhang, Xingdi,Li, Yongsheng,Li, Hua,Wu, Wei,Cui, Yunlong,Chen, Qian,Li, Liang,Gu, Jinlou,Zhao, Wenru,Shi, Jianlin
, p. 16549 - 16555 (2013/02/22)
Uniform mesoporous zeolite ZSM-5 crystals have been successfully fabricated through a simple hydrothermal synthetic method by utilizing ammonium-modified chitosan and tetrapropylammonium hydroxide (TPAOH) as the meso- and microscale template, respectively. It was revealed that mesopores with diameters of 5-20nm coexisted with microporous network within mesoporous ZSM-5 crystals. Ammonium-modified chitosan was demonstrated to serve as a mesoporogen, self-assembling with the zeolite precursor through strong static interactions. As expected, the prepared mesoporous ZSM-5 exhibited greatly enhanced catalytic activities compared with conventional ZSM-5 and Al-MCM-41 in reactions involving bulky molecules, such as the Claisen-Schmidt condensation of 2-hydroxyacetophenone with benzaldehyde and the esterification reaction of dodecanoic acid and 2-ethylhexanol. Mesoporous zeolite: Ammonium-modified chitosan served as a mesoporogen in the hydrothermal synthesis of mesoporous zeolite Socony Mobil (ZSM)-5, self-assembling with the zeolite precursor through strong static interactions (see figure; TPA=tetrapropylammonium, HTCC=N-(2-hydroxy)propyl-3-trimethylammonium chitosan chloride).
WAX COMPOSITION OF SARGASSUM FULVELLUM
Miyazawa, Mitsuo,Uematsu, Tosihisa,Kameoka, Hiromu
, p. 1788 - 1791 (2007/10/02)
Sixty-seven compounds were characterized in the wax of Sargassum fulvellum.Characteristic components were the 5-methylhexyl esters of octanoic, decanoic, lauric, myristic, palmitic, palmitoleic, stearic, oleic, linoleic and linolenic, and the 2-ethylhexyl esters of the same acids.The wax of S. fulvellum contains hydrocarbons (1.6percent), esters (21.8percent), free acids (74.9percent) and free alcohols (0.3percent).The principal free alcohols range in chain length only from C6 to C7. - Key Word Index: Sargassum fulvellum; Sargassaceae; Phaeophyta; wax; 5-methylhexyl esters; 2-ethylhexyl esters; 5-methylhexanol; 2-ethylhexanol.
