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OALib Journal期刊
ISSN: 2333-9721
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焙烧温度对二甲醚水蒸气重整制氢cu/zno/al2o3/cr2o3+h-zsm-5双功能催化剂性能的影响
, PP. 1240-1245
Keywords: cu/zno/al2o3/cr2o3+h-zsm-5催化剂,焙烧温度,水蒸气重整,二甲醚,氢
Abstract:
？采用共沉淀耦合机械混合法制备了cu/zno/al2o3/cr2o3+h-zsm-5双功能催化剂,并用于二甲醚水蒸气重整制氢反应,结合热重、傅里叶红外光谱、xrd、bet、h2-tpr表征,考察了焙烧温度对cu/zno/al2o3/cr2o3催化剂物理化学性质及双功能催化剂催化性能的影响。研究结果表明,400℃焙烧时,析出cuo粒子的同时伴有尖晶石相,进而在反应过程中对金属铜粒子起到良好的隔离作用。而焙烧温度较低时,催化剂分解不完全,催化剂活性位较少。焙烧温度大于500℃时,cuo粒子发生二次团聚,同时尖晶石相大量生成,造成催化剂活性位减少,活性较低。合适的焙烧温度为400℃,此时二甲醚转化率为92.9%,氢气收率可达到76.5%,具有较好的反应效果。
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