The delaminating and pillaring of MCM-22 for Fischer-Tropsch synthesis over cobalt
The delaminating and pillaring of MCM-22 for Fischer-Tropsch synthesis over cobalt
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MCM-22 在钴上费托合成中的分层和柱化
DOI：
10.1016/j.cattod.2016.01.042
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发表时间：
2016-10-01
期刊：
影响因子：
5.3
通讯作者：
Liu, Zhong-Wen
中科院分区：
文献类型：
--
作者：
Hao, Qing-Qing;Lei, Chun-Yan;Liu, Zhong-Wen
为了研究层状分子筛结构演变对Co/MCM-22衍生分子筛费托合成性能的影响，以MCM-22（P）为前驱体，通过直接焙烧、柱撑和脱层制备了MCM-22、MCM-36和具有不同MWW纳米片排列的脱层分子筛。结果表明，钴的还原程度在钴负载柱撑和脱层沸石上增加，并且催化剂的活性（即，Co/MCM-22 < Co/Al_2O_3-MCM-36 < Co/SiO_2-MCM-36 < Co/脱层沸石。与Co/MCM-22相比，Co柱撑和脱层分子筛的甲烷选择性明显降低。此外，Co负载的SiO2-MCM-36和Al 2 O3-MCM-36可以有效地缩小FT合成的产物分布，表现出明显提高的C4-C12选择性。然而，C-21+烃的选择性比Co/脱层沸石显着增加。基于MCM-22分子筛的结构和酸性以及催化剂的还原行为，很好地解释了这些结果。(C)© 2016 Elsevier B. V.版权所有。
To investigate the effect of structural evolution of layered zeolite on the performance of Co/MCM-22 derived zeolites for Fischer-Tropsch (FT) synthesis, the MCM-22, MCM-36 and delaminated zeolite characterized by different arrangement of MWW nanosheets were prepared through directly calcination, pillaring and delaminating of the layered precursor of the MCM-22 (MCM-22(P)). The results show that the extent of reduction of cobalt was increased over Co-supported pillared and delaminated zeolites, and the activities of the catalysts (i.e., CO conversions) were increased in the order of Co/MCM-22 < Co/Al2O3-MCM-36 < Co/SiO2-MCM-36 < Co/delaminated zeolite. Compared to Co/MCM-22, the selectivity of CH4 over Co-supported pillared and delaminated zeolites was decreased clearly. Moreover, Co-supported SiO2-MCM-36 and Al2O3-MCM-36 can effectively narrow the product distribution of FT synthesis showing clearly increased C-4-C-12 selectivity. However, the selectivity of C-21+ hydrocarbons over Co/delaminated zeolite was significantly increased. The results are well explained based on the structural and acidic properties of the MCM-22 derived zeolites together with the reduction behaviors of the catalysts. (C) 2016 Elsevier B.V. All rights reserved.