H-type zeolite coated iron-based multiple-functional catalyst for direct synthesis of middle isoparaffins from syngas
H-type zeolite coated iron-based multiple-functional catalyst for direct synthesis of middle isoparaffins from syngas
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DOI：
10.1016/j.apcata.2010.12.041
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发表时间：
2011-02-28
影响因子：
5.5
通讯作者：
Tsubaki, Noritatsu
中科院分区：
文献类型：
--
作者：
Bao, Jun;Yang, Guohui;Tsubaki, Noritatsu
通过水热合成方法，在铁熔催化剂颗粒表面直接结晶出致密、完整的H-ZSM-5沸石壳。合成的催化剂具有核壳结构，无针孔和裂纹。在合成气直接合成异链烷烃的反应中，C10+烃类的生成在这种核壳催化剂上被完全抑制，中间异构烷烃成为主要产物。特别地，实现了期望的低甲烷选择性。该催化剂的核壳结构提供了一个具有空间限制效应和形状选择性的定制的受限反应环境，其中从一个核壳催化剂外表面逸出的异链烷烃由于其较大的空间障碍而很难通过表面沸石壳进入另一个核壳催化剂，从而确保了较高的异链烷烃选择性。此外，与传统的膜反应器相比，这种类型的核壳催化剂具有非常高的单位反应器体积的膜面积并且易于制备。 (C) 2011 Elsevier B.V. 保留所有权利。
A compact, integral zeolite shell of H-ZSM-5 was directly crystallized on the surface of fused-iron catalyst pellet by a hydrothermal synthesis method. The synthesized catalyst has a core-shell structure without pinholes and cracks. For the reaction of direct synthesis of isoparaffin from syngas, the formation of C10+ hydrocarbons is suppressed completely on this core-shell catalyst, and the middle isoparaffins become the main products. Especially, desirable low methane selectivity is achieved. The core-shell structure of the catalyst provides a tailor-made confined reaction environment with spatially confined effect and shape selectivity, where isoparaffins escaping from outer surface of one core-shell catalyst hardly enter another core-shell catalyst via surface zeolite shell, due to its large steric obstacle, ensuring the elevated isoparaffin selectivity. Furthermore, this type of core-shell catalyst has very high membrane area per unit reactor volume and easy to be prepared, in contrast to the conventional membrane reactor. (C) 2011 Elsevier B.V. All rights reserved.