Combined reforming of methane over co-precipitated Ni–CeO2, Ni–ZrO2 and Ni–Ce0.8Zr0.2O2 catalysts to produce synthesis gas for gas to liquid (GTL) process
Combined reforming of methane over co-precipitated Ni–CeO2, Ni–ZrO2 and Ni–Ce0.8Zr0.2O2 catalysts to produce synthesis gas for gas to liquid (GTL) process
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DOI：
10.1016/j.cattod.2009.01.001
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发表时间：
2009-08
期刊：
影响因子：
5.3
通讯作者：
Hyun-Seog Roh;K. Koo;W. Yoon
中科院分区：
文献类型：
--
作者：
Hyun-Seog Roh;K. Koo;W. Yoon
采用共沉淀法制备了Ni-CeO2、ni - zro2和ni - ce0.8 zr0.2催化剂，开发了适用于气液合成气（GTL）工艺的催化剂。采用常规浸渍法制备了Ni/CeO2、Ni/ zro2和Ni/ ce0.8 zr0.2催化剂，并将浸渍催化剂与共沉淀催化剂进行了比较。两种情况下，Ni含量均固定在15%。结果表明，共析出的Ni - ceo2和Ni - ce0.8 zr0.2 2o催化剂具有较高的活性和稳定性，而浸渍的Ni/ ceo2和Ni/ ce0.8 zr0.2 2o催化剂在800℃下随时间缓慢失活。在700 ~ 750℃范围内，共沉淀ni - ce0.8 zr0.2催化剂的ch4和co2转化率高于ni - ceo2催化剂。共沉淀Ni - ce0.8 zr0.2催化剂的催化活性和稳定性增强是由于立方ce0.8 zr0.2载体的纳米晶性质与纳米NiO晶粒的精细分散相结合，使得Ni与载体紧密接触，Ni分散性更好，反应过程中氧转移增强。
Ni–CeO2, Ni–ZrO2and Ni–Ce0.8Zr0.2O2catalysts have been prepared by a co-precipitation method to develop catalysts suitable for synthesis gas production for gas to liquid (GTL) process. A conventional impregnation method was also employed to prepare Ni/CeO2, Ni/ZrO2and Ni/Ce0.8Zr0.2O2catalysts to compare the impregnated catalysts with the co-precipitated ones. Ni content was fixed at 15% for both cases. It has been confirmed that the co-precipitated Ni–CeO2and Ni–Ce0.8Zr0.2O2catalysts exhibited relatively high activity as well as stability, while the impregnated Ni/CeO2and Ni/Ce0.8Zr0.2O2catalysts slowly deactivated with time on stream at 800°C. At the temperature range from 700 to 750°C, co-precipitated Ni–Ce0.8Zr0.2O2catalyst showed higher CH4and CO2conversion than Ni–CeO2catalyst. The enhanced catalytic activity and stability of the co-precipitated Ni–Ce0.8Zr0.2O2catalyst is due to the combination of nano-crystalline nature of cubic Ce0.8Zr0.2O2support and finely dispersed nano-sized NiO crystallites resulting in intimate contact between Ni and support, better Ni dispersion, and enhanced oxygen transfer during the reaction.