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OALib Journal期刊
ISSN: 2333-9721
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au/hzsm-5沸石催化剂的正丁烷异构化反应性能的研究
, PP. 980-989
Keywords: au/hzsm-5,催化剂,正丁烷,异构化
Abstract:
？采用脉冲微反装置评价了纯正丁烷、含有不同比例异丁烷的混合丁烷在au改性的纳米hzsm-5催化剂上的反应活性和异构化选择性。结果表明,在300℃时,载金量为1.31%的催化剂上纯正丁烷原料的转化率可达7.0%,异丁烷选择性可达80%以上。相比之下,在纳米hzsm-5载体上正丁烷的转化率只有0.55%,异丁烷选择性仅为11.67%。在au负载量为0.12%~1.91%,随着au负载量的增加,正丁烷转化率先增后减,异丁烷选择性在低负载量时增加明显。在反应温度低于400℃时,纯正丁烷在载金催化剂上主要发生异构化反应;高于400℃时,主要发生裂解和芳构化等反应,即400℃是正丁烷在脉冲微反条件下异构化和裂解等反应的分水岭。另外,混合丁烷的组成对正丁烷异构化反应有一定影响,但在适当温度下正丁烷异构化时裂解产物很少,表现出金属-酸双功能催化特征。au+在反应中发挥了脱氢和加氢作用。
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