Carbon dioxide reforming of methane reaction catalyzed by stable nickel copper catalysts
Carbon dioxide reforming of methane reaction catalyzed by stable nickel copper catalysts
复制标题
DOI：
10.1016/j.cattod.2004.03.067
复制
发表时间：
2004-10-27
期刊：
影响因子：
5.3
通讯作者：
Liao, PH
中科院分区：
文献类型：
--
作者：
Chen, HW;Wang, CY;Liao, PH
开发了一种800 ℃下甲烷二氧化碳重整制合成气的长期稳定Cu/Ni/SiO2催化剂。Cu/Ni催化剂的稳定性取决于反应温度和Cu/Ni比。采用程序升温氧化和CO2程序升温反应对Ni和Cu/Ni催化剂进行了研究，考察了Cu对Ni催化剂的影响。这种稳定性不能完全用Cu对Ni金属的系综效应来解释，这种系综效应可能会抑制Ni催化剂上的成碳速率。铜可以稳定用于甲烷裂化反应的Ni表面上的活性位点的结构，防止由烧结或由镍微晶的损失引起的Ni催化剂的失活。在Ni催化剂体系中添加Cu可以微调催化剂活性，使得CH 4裂解和CO2去除焦炭平衡，并防止非活性焦炭在Ni颗粒上积累。因此，在负载的Cu/Ni上没有形成包覆的碳层，从而使催化剂具有稳定的活性。(C)2004 Elsevier B. V.保留所有权利。
A long-term stable Cu/Ni/SiO2 catalyst for carbon dioxide reforming of methane to produce synthesis gas at 800 degreesC was developed. The stability of the Cu/Ni catalysts depends on the reaction temperature and Cu/Ni ratio. Temperature programmed oxidation and temperature programmed reaction with CO2 were applied to Ni and Cu/Ni catalysts to study the effect of Cu on Ni catalyst. The stability can not be fully explained by the ensemble effect of the Cu on Ni metal that may inhibit the carbon formation rate on Ni catalyst. Copper may stabilize the structure of the active site on Ni surface for methane cracking reaction, preventing the deactivation of the Ni catalyst caused by sintering or by loss of nickel crystallites. The addition of Cu into Ni catalyst system can fine-tune the catalytic activity so that the CH4 cracking and removal of coke by CO2 is balanced and prevent inactive coke accumulation on Ni particle. Thus encapsulated carbon layer does not formed on supported Cu/Ni giving the catalyst a stable activity. (C) 2004 Elsevier B.V. All rights reserved.