摘要
研究了使用负载法制备的VOx／SiO2催化剂上的异丁烷催化脱氢制异丁烯的反应。使用XRD和Raman光谱技术表征了催化剂的表面结构，考察了催化剂的钒氧化物负载量、反应温度和H2／n-C4H10比对反应性能的影响。研究结果表明：钒氧化物最大单层覆盖量为9％左右，大于9％催化剂表面开始形成V2O5晶体，堵塞载体孔道，使催化剂活性位减少；V2O5负载量9％为最佳钒氧化物负载景；反应温度在590-620℃，氢烷比为1-3为最佳反应条件。同时C1-C3裂解收率受反应温度影响较大，而与氢烷比及钒氧化物负载量影响不大。
Isobutane catalytic dehydrogenation to isobutylene on VOx/SiO2 catalysts prepared by impregnation method was studied in a micro-fixed bed reactor under various conditions. The surface composition of catalysts was characterized by XRD and Raman techniques. The effects of V2O5 loading, reaction temperature and molar ratio of hydrogen to isobutane on the dehydrogenation of isobutane to isobutylene was investigated. The results showed that when the V2O5 loading exceeding 9% ,the catalysts surface started to form crystal V2O5, and the activity situ reduced owing to the pore jammed by crystal. The 9% V2O5 loading was the best loading. When reaction temperature was between 590-620℃, ratio of H2 to n - C4H10 was between 1-3, the catalystic activity was highest. The paper also pointed out the C1-C3 cracking was influenced mainly by reaction temperature,hardly by the conditions of ratio of H2 to n-C4H10 and V2O5 loadings.
出处
《山东化工》
CAS
2009年第3期7-9,14,共4页
Shandong Chemical Industry
