1-Butene metathesis over Mo/mordenite-alumina catalyst: Effect of sodium exchange degree in mordenite zeolite
1-Butene metathesis over Mo/mordenite-alumina catalyst: Effect of sodium exchange degree in mordenite zeolite
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DOI：
10.1016/j.molcata.2013.02.015
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发表时间：
2013-06
影响因子：
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通讯作者：
Xiujie Li;Dazhou Zhang;Xiangxue Zhu;Chen Fucun;Shenglin Liu;Sujuan Xie;Longya Xu
中科院分区：
文献类型：
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作者：
Xiujie Li;Dazhou Zhang;Xiangxue Zhu;Chen Fucun;Shenglin Liu;Sujuan Xie;Longya Xu
制备了一系列丝光沸石钠交换度递增的Mo/丝光沸石-氧化铝催化剂，并评价了其在1-丁烯歧化反应中的性能。丝光沸石交换度的变化对产物分布和催化活性有显著影响。NH_3-TPD和~ 1HMASNMR结果表明，丝光沸石中钠离子的交换程度直接影响催化剂上的酸中心密度和分布。载体酸性的变化导致钼物种在载体上的不同锚定方式和分散度，进而导致钼物种在烯烃气氛下的不同还原行为。提出了产物分布与催化剂性能之间的良好相关性。
A series of Mo/mordenite-alumina catalysts with progressive sodium exchange degrees in mordenite were prepared and their performance in 1-butene metathesis reaction was evaluated. Significant variations in product distribution and catalytic activity were observed when the exchange degree of mordenite changed. As revealed by NH3-TPD and1H MAS NMR results, the acid site density and distribution over the catalysts were directly related to the degree of ion-exchange of sodium in mordenite. The change of support acidity led to different anchoring modes and dispersion of Mo species on the support which further resulted in the different reduction behavior of Mo species under olefin atmosphere. A good correlation between product distribution and properties of the catalysts was proposed.