摘要
研究了C_2选择加氢催化剂的结焦对催化剂性能的影响,结焦造成比表面积损失90%以上,比孔容损失约85%,催化剂质量增加21%,结焦使催化剂孔径分布产生较大变化,催化剂活性大幅度降低。结焦物形成过程中,主要发生狄尔斯-阿德尔反应、羟甲酰化反应和齐聚反应。采取降低床层温度、提高C_2:物料纯度、减少C_3组分含量、在反应物料中不加入CO、减少物料中含氧化物含量以及提高氢气分压的措施,可以降低催化剂结焦速率,延长催化荆使用周期和寿命。
The influence of coke formation on the performance of C2 hydrogenation catalysts was studied. Coke formation resulted in loss of surface area and specific pore volume by 90% and 85%, respectively, increase in mass of the catalyst by 21%, remarkable change in pore size distribution and hence remarkable decrease in the catalytic activity. There occurred mainly Diels-Alder, hydroxyformylation and oligomerization reactions during coke formation. The coke formation rate could be lowered by lowering the bed temperature, enhancing purity of the C2 feed, eliminating CO in the feed, reducing oxo-compounds in the feed and increasing the hydrogen pressure, and thus operation cycle and service life of the catalysts were prolonged.
出处
《工业催化》
CAS
2009年第3期38-41,共4页
Industrial Catalysis
基金
国家高技术研究发展计划(863计划)(2008AA030800)
关键词
石油化学工程
C2加氢催化剂
结焦
petrochemical technology
C2 hydrogenation catalyst
coke formation
