| 改性HZSM-5沸石对二甲苯异构化的影响 |
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| 引用本文： | 徐文旸,曹景慧,窦涛,李建权,马静红. 改性HZSM-5沸石对二甲苯异构化的影响[J]. 石油化工, 1988, 0(12) |
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| 作者姓名： | 徐文旸 曹景慧 窦涛 李建权 马静红 |
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| 作者单位： | 太原工业大学精细化工研究所，太原工业大学精细化工研究所，太原工业大学精细化工研究所，太原工业大学精细化工研究所，太原工业大学精细化工研究所 |
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| 摘 要： | 采用脉冲微反技术对改性 ZSM-35沸石(Cr、Co、Ni)的性能进行了考察。吡啶、2,6-二甲基吡啶对 CrHZSM-35的酸度和酸强度试验表明,邻二甲苯异构化的活性中心是 B 酸中心,但主要是弱 B 酸中心。随温度升高,部分弱酸中心转化为强酸中心。Cr~(3+)的加入使 CrHZSM-35的活性比HZSM-35的活性高约10%,平衡选择性高约1%。金属离子的含最增加,催化活性增加。但邻二甲苯的异构化反应机理不变。
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Xylene Isomerization on HZSM-35 Modified by Metallic Cation |
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| Abstract: | The properties of HZSM-35 modified by Cr、Co、Ni was studied with a pulsemicroreaction.The acidity and acid strength of CrHZSM-35 as determined by techniques of pulsed poisoning experiment(PPE)showed that the activity sites ofo-xylene isomerization were chiefly weak Br(?)nsted acid sites.The weak acid siteswere partly transferred into strong ones with increase in temperature.The activ-ity and equilibrium selectivity of CrHZSM-35 increased by 10% and 1% respect-ively.But the mechanism of o-xylene isomerization remained unchanged.Thecatalytic activity increased with increasing content of metal. |
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