Catalytic activity of ni-based oxygen-carriers for steam methane reforming in chemical-looping processes
Catalytic activity of ni-based oxygen-carriers for steam methane reforming in chemical-looping processes
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DOI：
10.1021/ef2013612
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发表时间：
2012-01
期刊：
影响因子：
5.3
通讯作者：
M. Ortiz;L. F. D. Diego;A. Abad;F. García-Labiano;P. Gayán;J. Adánez
中科院分区：
文献类型：
--
作者：
M. Ortiz;L. F. D. Diego;A. Abad;F. García-Labiano;P. Gayán;J. Adánez
化学循环技术被认为是降低使用化石燃料捕获二氧化碳成本的最有前途的技术之一。该技术涉及使用氧载体，其将氧从空气转移到燃料，避免它们之间的直接接触。基于镍的氧载体在文献中得到了最广泛的分析，因为它们在高温（900-1100 °C）下具有良好的性能。众所周知，Ni催化蒸汽甲烷重整（SMR）和水煤气变换（WGS）反应，其在化学链燃烧（CLC）和化学链重整（CHR）过程中产生。在固定床反应器中，考察了浸渍法制备的NiO_（18）-α-Al_2 O_3和NiO_（21）-γ-Al_2 O_3两种镍基载氧体在不同操作条件下对SMR和WGS反应的催化活性。两种载氧体的催化活性相似，但低于传统的镍催化剂。
Chemical-looping technology has been suggested as one of the most promising technologies for reducing the cost of CO2 capture using fossil fuels. This technology involves the use of an oxygen-carrier, which transfers oxygen from air to the fuel avoiding the direct contact between them. Oxygen carriers based on nickel have been the most extensively analyzed in the literature because of their good performance working at high temperatures (900–1100 °C). It is well-known that Ni catalyzes steam methane reforming (SMR) and water–gas shift (WGS) reactions, which are produced both in chemical-looping combustion (CLC) and chemical-looping reforming (CLR) processes. In this work, the catalytic activity of two Ni-based oxygen-carriers prepared by impregnation, NiO18-αAl2O3 and NiO21-γAl2O3, with respect to SMR and WGS reactions, have been determined in a fixed-bed reactor at different operating conditions. The catalytic activity was similar for both oxygen-carriers but lower than that exhibited by conventional Ni c...