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采用柠檬酸络合法,经900℃热处理制备了CuAl2O4、CuFe2O4和CuCr2O4三种尖晶石,并进行了甲醇重整性能评价。结合XRD、H2-TPR、SEM和BET等表征,研究了铜基尖晶石的催化特性。结果表明,三种铜基尖晶石的形貌和大小有极大差异,表现出不同的催化性能,CuAl2O4尖晶石获得最优的稳定性和最低的CO选择性,CuFe2O4尖晶石上CO选择性最高且稳定性差,CuCr2O4尖晶石上石墨碳沉积最严重。根据长时间评价结果和表征数据发现,在反应气氛中铜基尖晶石不稳定,通过释放活性铜而起催化作用;同时铜的烧结长大与积炭现象共同影响催化性能。
Three kinds of spinel, CuAl2O4, CuFe2O4 and CuCr2O4, were prepared by citric acid complexation method and heat treated at 900 ℃. The properties of methanol reforming were also evaluated. Combined with XRD, H2-TPR, SEM and BET characterization, the catalytic properties of copper-based spinel were studied. The results show that the morphology and size of the three copper-based spinels are very different, showing different catalytic properties, CuAl2O4 spinel to obtain the best stability and the lowest CO selectivity, CuFe2O4 spinel CO selection The highest and least stable CuCr2O4 spinel graphite carbon deposition on the most serious. According to long-term evaluation results and characterization data, it was found that the copper-based spinel was unstable in the reaction atmosphere and catalyzed by the release of active copper. Simultaneously, the sintering and growth of copper affected the catalytic performance together with coke deposition.