OALib Journal期刊
ISSN: 2333-9721
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不同载体ni基负载型催化剂对甲烷部分氧化制合成气催化行为研究
, PP. 228-234
Keywords: 甲烷,部分氧化,镍,载体
Abstract:
?采用浸渍法制备了单一载体(al2o3、zro2、ceo2)和zro2、ceo2改性的al2o3复合载体的ni催化剂,考察了在甲烷部分氧化制备合成气反应中的催化性能。通过n2-物理吸附、h2程序升温还原、x射线衍射、nh3程序升温脱附和程序升温氧化等技术对催化剂进行了表征。结果表明,在单一载体催化剂中,ni/al2o3具有较大的比表面积,其初始反应活性较高,但该催化剂表面易形成大量的积炭而快速失活。ni/zro2和ni/ceo2催化剂比表面积较小,活性金属ni在其表面分散性差,催化剂具有较低的ch4转化率。而ceo2和zro2改性的al2o3复合载体催化剂,具有较大的比表面积,反应活性明显高于单一载体催化剂。ceo2-al2o3复合载体催化剂具有最高的反应活性和较好的反应稳定性。同时表明,含ceo2催化剂反应后表面积炭较少,ceo2的储放氧功能增强了催化剂对o2的活化,提高催化剂活性的同时,可以抑制积炭的生成。
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