合成气直接制取低碳烯烃的单管扩大试验Ⅲ．催化剂再生性能研究

Single tube scaleup tests on direct conversion of syngas to light olefins Ⅲ. studies of regenerated catalyst properties

对Ｋ－Ｆｅ－ＭｎＯ／Ｓｉｌｉｃａｌｉｔｅ－２催化剂积炭及烧炭的差热与热重分析结果表明，在ＣＯ加氢反应过程中催化剂表面可形成两种类型的积炭，其中Ⅰ型炭有利于提高ＣＯ加氢制低碳烯烃的选择性，而Ⅱ型炭则不能。研究结果还表明，Ｋ－Ｆｅ－ＭｎＯ／Ｓｉｌｉｃａｌｉｔｅ－２催化剂经再生后可恢复其新鲜态催化剂性能。在单管扩大试验中，反应器入口高温区催化剂表面容易形成Ⅰ型和Ⅱ型积炭，而恒温区催化剂表面只有Ⅰ型积炭。

he differential thermal and thermo gravimetric analyses of K Fe MnO/silicalite 2 catalyst carbon deposit and carbon burning show that two types of carbon deposit may be formed on the catalyst surface during CO hydrogenation reaction, in which type I carbon deposit is advantagous to increase light olefins selectivity in CO hydrogenation, but type Ⅱ carbon deposit is not. The analytic results also show that K Fe MnO/silicalite 2 catalyst can be restored to its fresh state catalytic properties after regeneration. In the single tube scaleup tests, type Ⅰ and Ⅱ carbon deposits can easily be formed on the catalyst surface at the high temperature zone of the reactor inlet, and only type I carbon deposit is formed on the catalyst surface at the constant temperature zone, which will cause the displacement of the highest temperature zone in catalyst bed.