甲苯、甲醇在碱性沸石上侧链烷基化反应的研究 Ⅱ.X型沸石交换度对侧链反应的影响 |
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引用本文: | 王宇红,张志新,周敬来. 甲苯、甲醇在碱性沸石上侧链烷基化反应的研究 Ⅱ.X型沸石交换度对侧链反应的影响[J]. 天然气化工, 1998, 0(3) |
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作者姓名: | 王宇红 张志新 周敬来 |
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作者单位: | 中国科学院山西煤炭化学研究所 |
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摘 要: | 以催化剂的评价和表征结果为依据,探讨了交换度、总碱度和总产率三者的关系。认为随着沸石中钾离子交换度的提高,分子筛表面总碱度急剧上升,甲苯、甲醇的侧链反应性能逐渐增强,但总收率存在一峰值,这说明苯乙烯和乙苯的总产率不是无限制地随着沸石阳离子交换度的提高而提高。总碱度与总收率成正比关系,总碱量有一最大值,苯乙烯和乙苯的总产率有一峰值,最大值和峰值是相对应的。
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关 键 词: | 沸石 交换度 甲苯 侧链烷基化 |
Investigation on side chain alkylation of toluene with methanol over a basic zeolite catalystⅡ.Effect of exchange degree on the alkylation |
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Abstract: | ased on the results from evaluation and characterization of a K+ exchanged zeolite catalyst for side chain alkylation of toluene with methanol, the effect of K+ exchange degree is investigated on the total basicity of the zeolite surface and the catalytic activity of the zeolite for alkyla tion. It is found that, with an increase in K+ exchange degree, the total surface basicity is significantly increased and the performance of side chain alkylation is gradually enhanced. There is a maximum in total yield of styrene and ethylbenzene, showing that the total yield will not increase unlimitedly with the increase of exchange degree. At an optimal value of K+ exchange degree, both the total basicity and total yield reach their maximum, indicating a positive effect of the total basicity on the total yield. |
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Keywords: | zeolite exchange degree toluene side chain alkylation |
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