| 郭洪臣教授.正丁烷和异丁烷在改性纳米HZSM-5上的芳构化反应[J].分子催化,2012,(3):257-264 |
| 正丁烷和异丁烷在改性纳米HZSM-5上的芳构化反应 |
| Aromatization of n-butane and i-butane over modified nano-HZSM-5 catalyst |
| 投稿时间：2012-04-06 修订日期：2012-06-03 |
| DOI： |
| 中文关键词: 正丁烷，异丁烷，芳构化，脉冲微反，改性纳米HZSM-5 |
| 英文关键词:butane aromatization, nano-HZSM-5, zinc modifycation, mini-scale pulse reactor. |
| 基金项目:本文没有资助 |
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| 摘要点击次数: 2065 |
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| 中文摘要: |
| 本文用脉冲微反装置评价了正丁烷和异丁烷在氢型和锌改性的纳米ZSM-5催化剂上的反应活性和芳构化选择性。结果表明，在550℃下，异丁烷在氢型和不同锌负载量的纳米ZSM-5催化剂上的转化率都远高于正丁烷，但其芳构化选择性低于正丁烷。脱甲基活化是异丁烷和正丁烷的重要活化方式，也是影响其芳构化选择性的主要因素。锌改性在提高异丁烷和正丁烷转化率的同时，也促进了正丁烷和异丁烷的脱甲基活化。在混合丁烷进料反应的情况下，正丁烷和异丁烷的转化率与其单独进料时十分接近，这说明正丁烷和异丁烷共存时不会发生明显的竞争吸附和反应。纳米ZSM-5因晶粒度小，孔道短和微孔扩散阻力低而有利于异丁烷转化。 |
| 英文摘要: |
| The conversion of n-butane and i-butane over HZSM-5 and Zn/HZSM-5 catalysts were evaluated with mini-scale pulse reactor in terms of reactivity and aromatization selectivity. Results show that, i-butane has higher conversion than n-butane at 550℃ on both HZSM-5 and Zn/HZSM-5 catalysts, however, the aromatics selectivity of i-butane is lower than that of n-butane. Demethylation is the main path of n-butane and i-butane activation, and which is also an important factor to affect aromatization selectivity. Zinc modificatioin remarkably increases the conversion of i-butane and n-butane and, at the same time, promotes their demethylation activation. When the mixture of n-butane and i-butane were used as feedstock, no difference is seen in terms of n-butane and i-butane conversions compared with the pure butane feedstocks, which implies that there is no obvious competition between n-butane and i-butane during adsorption activation and subsequent reactions. Nano-ZSM-5 zeolite is beneficial to the conversion of i-butane due to its small grain size, short channel and lower diffusion resistence. |
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