Steam Reforming of Methanol in a Pd-Composite Membrane Reactor
Steam Reforming of Methanol in a Pd-Composite Membrane Reactor
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DOI：
10.1080/01496395.2012.672357
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发表时间：
2012-01
影响因子：
2.8
通讯作者：
M. A. Islam;S. Ilias
中科院分区：
文献类型：
--
作者：
M. A. Islam;S. Ilias
正在研究钯基膜用于通过平衡移动在单一单元操作中从重整反应中同时生产和分离H2。本文采用管式Pd复合膜作为燃料重整器，研究了Al_2 O_3载体上Zn/Ni催化剂上甲醇水蒸气重整反应。采用表面活性剂诱导化学镀（SIEP）法在微孔不锈钢（MPSS）载体上沉积钯膜，制备了钯复合膜。考察了水蒸气与甲醇摩尔比（S/M）、温度和催化剂时间因素对SRM膜反应器中甲醇转化率、H2-和CO-选择性的影响。为了研究SRM膜反应器的性能，建立了一个二维拟均相膜反应器模型。实验结果表明，通过平衡移动可显著提高H2选择性Pd-MPSS膜反应器中甲醇的转化率。S/M比对甲醇转化率的影响不大，在高S/M比下，水蒸气起稀释剂的作用。温度对甲醇转化率影响较大，随着催化剂时间因子的增加，甲醇转化率有一定程度的提高。CO选择性对温度敏感，对S/M比敏感程度较低。相反，H2-选择性对温度和S/M比都不敏感。在该实验中观察到的趋势在Pd-MPSS膜反应器中的SRM与2-D伪均相SRM膜反应器模型吻合良好。
Palladium-based membranes are being studied for simultaneous production and separation of H2 from reforming reactions in a single-unit operation by equilibrium shift. In this work a Pd-composite membrane in tubular configuration as fuel reformer was used to study the steam reforming of methanol (SRM) over Zn/Ni catalyst on Al2O3 support. The Pd-composite membrane was fabricated by depositing thin Pd film on microporous stainless steel (MPSS) support by surfactant induced electroless plating (SIEP) method. The effects of steam to methanol molar feed ratio (S/M), temperature, and catalyst time factor on methanol conversion, H2- and CO-selectivity were studied for the SRM in the membrane reactor. A two-dimensional, pseudo-homogeneous membrane-reactor model for the SRM reactions was developed to study the membrane reactor performance. Experimental results show that a significant enhancement of methanol conversion is achievable in H2-selective Pd-MPSS membrane reactor by equilibrium shift. The S/M ratio has marginal effect on methanol conversion, and at high S/M ratio, steam acts as diluent. The temperature has a greater effect on methanol conversion and with increased catalyst time factor, methanol conversion increased to some extent. The CO-selectivity was sensitive to temperature and to a lesser extent to the S/M ratio. On the contrary, H2-selectivity was insensitive to both temperature and S/M ratio. The trends observed in this experimental SRM in Pd-MPSS membrane reactor were in good agreement with a 2-D pseudo-homogeneous SRM membrane reactor model.