摘要
考察和分析了Pt/Al2O3体系的乙苯脱氢-氢选择性氧化催化剂的失活原因。研究结果表明,该催化剂的失活主要是由于长期在高温和水蒸气条件下运行,造成Pt晶粒团聚导致的;另外,来自前段脱氢催化剂的铁元素,由于非选择性氧化活性较高也会在一定程度上使催化剂中毒失活;而表面积炭对催化性能的影响不大。
Deactivation of Pt/Al2O3 catalyst for selective oxidation of hydrogen from ethylbenzene dehydrogenation was studied. Experimental results indicated that deactivation of Pt/Al2O3 catalyst was caused mainly by the agglomeration of Pt particles after a long-time operation under severe hydrothermal conditions, in addition, the deposition of iron species from the ethylbenzene dehydrogenation catalyst in the previous reactor could also lower the selectivity of hydrogen oxidation, because iron oxides could catalysis the deep oxidation of hydrocarbons. Furthermore, it was proved that the effect of coking on the deactivation was insignificant.
出处
《化学反应工程与工艺》
EI
CAS
CSCD
北大核心
2006年第2期125-130,共6页
Chemical Reaction Engineering and Technology
关键词
乙苯脱氢
氢选择性氯化
催化剂
失活
ethylbenzene dehydrogenation
selective oxidation of hydrogen
Pt/Al2O3 catalyst
deactivation
