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