New insight into the activity of ZSM-5 supported Co and CoRu bifunctional Fischer–Tropsch synthesis catalyst
New insight into the activity of ZSM-5 supported Co and CoRu bifunctional Fischer–Tropsch synthesis catalyst
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DOI：
10.1016/j.cej.2013.11.050
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发表时间：
2014-03
影响因子：
15.1
通讯作者：
Man Yao;N. Yao;Yan Shao;Qian Han;Chengcheng Ma;Changkun Yuan;Chengen Li;Xiaonian Li
中科院分区：
文献类型：
--
作者：
Man Yao;N. Yao;Yan Shao;Qian Han;Chengcheng Ma;Changkun Yuan;Chengen Li;Xiaonian Li
采用PEG-添加剂法制备了ZSM-5负载的钴基和钴钌基双功能费托合成（FTS）催化剂。该方法有利于Co 3 O 4颗粒在ZSM-5载体外表面的沉积。与传统浸渍法制备的催化剂相比，该催化剂具有更好的还原性能。虽然PEG添加剂可以提高Co/ZSM-5催化剂上CO的转化率，但ZSM-5负载Co催化剂对H物种的吸附强度大于SiO2负载Co催化剂。结果表明，Co/ZSM-5催化剂的转化率（TOF）低于Co/SiO2催化剂。通过PEG-添加法添加微量Ru助剂，可在CoRu/ZSM-5催化剂上形成稳定的CoRu颗粒。Co-Ru协同效应通过削弱H物种与催化剂之间的相互作用而不是改变Co 0位的性质，提高了CoRu/ZSM-5催化剂的TOF值和C5+选择性。这种效应使得CoRu/ZSM-5催化剂在FTS反应中比Co/ZSM-5催化剂产生更多的汽油烃。
The PEG-additive method was used to prepare the ZSM-5 supported Co- and CoRu-based bifunctional Fischer–Tropsch synthesis (FTS) catalysts. This method facilitated the deposition of Co3O4particles on the exterior surface of ZSM-5 support. The resultant catalyst had better reducibility than the conventional impregnation method derived catalyst. Although the PEG-additive protocol could improve the CO conversion on Co/ZSM-5 catalyst, the ZSM-5 supported Co catalyst adsorbed H species stronger than the SiO2supported Co catalyst. As a result, the Co/ZSM-5 catalyst had lower turnover frequency (TOF) than Co/SiO2catalyst. The presence of trace Ru promoter by the PEG-additive method could form bimetallic CoRu particles on CoRu/ZSM-5 catalyst. The Co–Ru synergistic effect improved the TOF value and the C5+selectivity of CoRu/ZSM-5 catalyst by weakening the interaction between the H species and catalyst instead of altering the nature of Co0sites. This effect allowed the CoRu/ZSM-5 catalyst produce more gasoline-range hydrocarbons than Co/ZSM-5 catalyst in the FTS reaction.