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OALib Journal期刊
ISSN: 2333-9721
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制备方法对ni-al2o3催化剂在co2-ch4重整反应中催化性能的影响
, PP. 1083-1091
Keywords: ch4/co2重整,ni-al2o3催化剂,制备方法,nial2o4尖晶石
Abstract:
？为提高镍基催化剂的干法重整活性,采用溶液燃烧法、等体积浸渍法、胶体磨循环浸渍法和水热-沉积法制备了scm、imp、t310和htp四种催化剂,在800℃考察了其在co2-ch4重整反应中的催化性能,并结合icp-aes、n2吸附-脱附、xrd、h2-tpr和tem等表征手段对催化剂进行分析。结果表明,水热-沉积法和胶体磨循环浸渍法制备的催化剂比表面积较大,分别为190.83和182.21m2/g,可为反应提供较多的接触面积,进而提高催化剂的初始活性(htp试样ch4和co2初始转化率相对较高,分别达85.15%和90.84%);而溶液燃烧法和等体积浸渍法制备的催化剂具有较多的nial2o4尖晶石,其还原峰面积占总还原峰面积90%以上,还原后可获得更多晶粒粒径更小的稳定活性组分ni(scm和imp试样稳定性更好,反应50h后活性超过htp和t310试样,100h后ch4转化率方降至50%以下)。因此,决定催化剂稳定活性的更重要的因素应该是活性组分ni晶粒粒径的大小及其抗烧结能力的强弱。
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