论文部分内容阅读
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 WO3 / ZrO2 solid acid catalysts activated by transition metal M (M = Pt, Co, Ni, Mn, Fe and Cu) were prepared and their crystal structures were determined by XRD, DTA TG, H2 TPR and NH3 TPD , The surface state and the amount of acid.The results show that the ZrO2 in each sample mainly exists in the T crystal phase, but the proportion of the T crystal phase ZrO2 varies with the transition metal, the specific surface area slightly decreases than the WO3 / ZrO2; The surface state of WO3 was changed in monolayer.The alkylation of isobutane / butene was studied, and the reaction activity was correlated with the determination of acidity. Compared with WO3 / ZrO2, M The conversion of butene on WO3 / ZrO2 both decreased slightly, but had a higher i C08 selectivity. The reaction mechanism was analyzed for the reason of no significant effect of adding transition metal.