MCM-41分子筛负载钼钴系催化剂的程序升温硫化研究

TPS Study of MCM-41 Supported Mo-Co Catalysts

采用程序升温硫化 (TPS)技术 ,研究了负载于 MCM- 41分子筛的钼钴系催化剂的性能 .根据 TPS结果可知 ,(1)载体和 Mo O3相互作用的强度顺序如下 :Al2 O3>Al2 O3- MCM- 41>MCM- 41>Ti O2 - MCM- 41,说明 Ti O2具有削弱 MCM- 41和 Mo O3作用的能力 ;而 Al2 O3则相反 ,它增强了 Mo O3 和 MCM- 41的相互作用 .(2 )助剂Co O对负载于未经改性的 MCM- 41载体上的 Mo O3的硫化没有明显的促进作用 ,这和以 Al2 O3为载体的情况不同 ,在 Al2 O3上 ,Mo O3和 Co O可能生成 Co- Mo- O复合相 ,从而促进了 Mo O3的硫化 .(3)助剂 Co O对负载于经Ti O2 和 Al2 O3改性的 MCM- 41上的 Mo

The characters of MoO 3 and MoO 3\|CoO supported on meso\|porous molecular sieve MCM 41 and modified MCM 41 were studied by temperature\|programmed sulfidization(TPS) technique. The results of TPS indicate that: (1) The order of the interaction intensity of MoO 3 with supports are as follows: \{Al\-2O\-3>\}Al\-2O\-3\|MCM 41>MCM 41>TiO\-2\|MCM 41, thus it can be deduced that TiO\-2 weakens the interaction of MoO 3 with MCM 41, while Al\-2O\-3 strengthens such interaction. (2) On Al\-2O\-3 support, MoO 3 may interact with CoO to form Co\|Mo\|O composite phase, however, unlike Al\-2O\-3, on MCM 41 support, CoO does not obviously affect the character of MoO 3. (3) CoO accelerates the sulfidization of MoO 3 on TiO\-2 and Al\-2O\-3 modified MCM 41.