摘要
本文主要分析了改性β沸石催化剂失活的原因并考察其再生方法。研究表明，钠的毒化作用可经水洗过氧化氢异丙苯（CHP）而抑制。程序升温氧化（TPO）表明改性β沸石催化剂上的积碳量较少。色质联用分析表明，改性β沸石催化剂上的积炭物质主要是对甲乙苯、枯酚及二元波酸酯等。这些物质是由于苯酚聚合或苯酚与副产物发生副反应而产生的。第一次再生后的催化剂活性和单程寿命虽有一定程度的下降，但在后续再生后，催化剂活性和单程寿命基本稳定。
The causes for deactivation of modified β-zeolite catalyst and the way for its regeneration were investigated. It was shown that the poisoning effect of Na2O can be suppressed by water washing of CHP. Temperature-programmed oxidation (TPO)showed that amount of coke in.deacti-vated catalyst is very small. GC-MS analysis indicated that the coke is mainly composed of p-methyl ethyl benzene, p-methoxy ethyl benzene, cumene phenol and benzenedicarboxylic acid es-ter. The deactivation may be caused by phenol polymerization and side reactions between phenol and by-products. Single-pass life of the catalyst was declined by 60% after the first regeneration and tended to keep stable after several times of regeneration.
出处
《工业催化》
CAS
1999年第5期18-23,共6页
Industrial Catalysis
关键词
沸石
催化剂
过氧化氢
分解
异丙苯
再生
活性
deactivation
coke forrnation
modified β-zeolite
regeneration
CHP decomposition
