Monodisperse and high-surface-area mesoporousinorganic spheres of various compositions including metal oxides, mixed oxides, and metal phosphates are prepared by templatingmesoporous carbon spheres which are replicated from spherical mesoporous silica. Due to the rigid and thermally stable framework of carbon template, the crystalline phases of the obtained metal oxide spheres can be readily tailored
Zinc zirconium phosphate as an efficient catalyst for chemoselective synthesis of 1,1-diacetates under solvent-free conditions
作者:ABDOL R HAJIPOUR、HIRBOD KARIMI
DOI:10.1007/s12039-015-0955-2
日期:2015.11
eco-friendliness, chemoselectivity, simple experimental and work-up procedure, solvent-freeconditions and usage of only a stoichiometric amount of AA. Zinc zirconium phosphate nanoparticles were prepared as a green and chemically stable catalyst. Selective protection and deprotection of aldehydes were performed undersolvent-free condition with fair yields.
Conversion of fructose, glucose and sucrose to 5-hydroxymethyl-2-furfural over mesoporous zirconium phosphate catalyst
作者:Archana Jain、Andrew M. Shore、Subash C. Jonnalagadda、Kandalam V. Ramanujachary、Amos Mugweru
DOI:10.1016/j.apcata.2014.10.020
日期:2015.1
catalyst for the conversion of sugars into HMF. The catalyst was synthesized using a hydrothermal method and was characterized using powder XRD, FT-IR spectroscopy and FESEM. The as-prepared catalyst showed porous structure and a very high surface area. Mesoporous zirconium phosphate exhibited excellent catalytic activity for the formation of HMF, from fructose, glucose and sucrose. The effect of various
Synthesis of isoprene from formaldehyde and isobutene over phosphate catalysts
作者:V.L. Sushkevich、V.V. Ordomsky、I.I. Ivanova
DOI:10.1016/j.apcata.2012.06.034
日期:2012.10
NbP, while the selectivity to isoprene showed the reverse tendency. The main side reaction was formaldehyde decomposition into carbon monoxide and dihydrogen. It is proposed that isoprene is formed on the Brønsted acid sites of the catalyst, while Mδ+Oδ− ion pairs are responsible for competitive carbon monoxide formation. The high resistance of ZrP and NbP catalysts to deactivation is accounted for
异丁烯与甲醛的汽相Prins缩合反应已在硼(BP),铝(AlP),钛(TiP),锆(ZrP)和铌(NbP)磷酸盐上进行了研究。通过元素分析,X射线衍射,氮气的低温吸附,氨的TPD和吡啶的FTIR对催化剂进行了表征。发现异丁烯和甲醛在磷酸盐上的转化按以下顺序增加:BP≪ AlP
Decomposition of Chlorobenzene over Phosphate and Sulfate Catalysts Properties
The catalytic conversion of chlorobenzene (CB) over some metal phosphates and sulfate was studied in the presence of water vapor and oxygen. The conversion of CB proceeded in the order of AlPO 4 , Zr 3 (PO 4 ) 4 , CePO 4 -AlPO 4 , and La 2 (SO 3 ) 3 above 673 K. The major products were CO, CO 2 , and HCl. The reaction proceeded in the absence of water vapor; however, the activity was greatly reduced