摘要
制备了一系列用过渡金属M (M =Pt,Co ,Ni,Mn ,Fe,Cu)活化的WO3 /ZrO2 固体强酸催化剂 ,用XRD ,DTA TG ,H2 TPR ,NH3 TPD等测定了其晶型结构、表面状态和酸量 .结果表明 ,各样品中的ZrO2 主要以T晶相存在 ,但T晶相ZrO2 所占的比例因过渡金属不同而异 ,比表面积比WO3 /ZrO2 稍有下降 ;金属Pt的引入使呈单层分散的WO3 的表面状态发生了改变 .研究了异丁烷 /丁烯烷基化反应 ,其反应活性与酸量的测定结果有对应关系 ;与WO3 /ZrO2 相比 ,M WO3 /ZrO2 上的丁烯转化率均稍有下降 ,但具有更高的i C08选择性 .从反应机理分析了添加过渡金属无显著效果的原因 .
A series of M WO 3/ZrO 2 (WMZ) solid strong acid catalyst samples with transition metal (M=Pt, Cu, Mn, Fe, Co, Ni) were prepared, and their crystal structure, surface state and acid amount were determined by XRD, TG DTA, H 2 TPR and NH 3 TPD. The results showed that ZrO 2 in the samples mainly existed in tetragonal phase, but its content varied with different transition metals. The specific surface area of WMZ decreased compared with WZ. The surface state of WO 3 dispersed in monolayer changed only in WPtZ sample. The alkylation of isobutane with butene was studied, and the reactivity was related with the measured surface acid sites, the butene conversion over WMZ declined but the selectivity for i C 0 8 increased compared with that over WZ. Based on the reaction mechanism, it was elucidated that the addition of transition metal had scarcely any effect on the catalytic performance.
出处
《催化学报》
CSCD
北大核心
2000年第3期229-233,共5页
基金
国家自然科学基金!"九五"重大资助项目(29792076)
关键词
WO3/ZRO2
固体强酸催化剂
异丁烷
丁烯
烷基化
transition metal
tungsten trioxide
zirconia
strong solid acid
isobutane
butene
alkylation
