甲基叔丁基醚裂解制备高纯度异丁烯
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摘要: 制备了一系列用于甲基叔丁基醚（MTBE）裂解制异丁烯反应的硅酸铝催化剂，评价了其反应活性和选择性，用X光衍射（XRD）、物理吸附、傅立叶变换红外（FT-IR）等技术对催化剂结构性质进行表征。结果表明，添加合适的助剂、适宜的温度下焙烧有助于MTBE裂解制异丁烯硅酸铝催化剂的性能改善和活性提高。在催化剂的物化性质中，与活性关系较密切的是催化剂的比表面积、总酸量和B酸与L酸的比值。同时发现，一种添加助剂并经过特殊处理的催化剂WVI，在常压、WHSV为2 h－1条件下，反应温度从220 ℃提高到360 ℃，累计时间达3 840 h时，MTBE转化率可达99.9%，异丁烯选择性可维持在99%。
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关键词:
- 甲基叔丁基醚（MTBE） /
- 硅酸铝催化剂 /
- 异丁烯
Abstract: Physiochemical properties and their activity, selectivity of a series of aluminum silicate catalysts for MTBE cracking to isobutene were examined by catalytivity test, XRD, physical adsorption and FT-IR. The results showed that the addition of suitable promoter and calcining at an appropriate temperature could improve the physiochemical properties and activity of the catalyst. In all properties measured in this paper, specific surface area, total acid amount and the ratio of Bronsted acid to Lewis acid could have close relations with catalystic activity. It was also found that the MTBE conversion and isobutene selectivity over the catalyst named WVI were 99.9% and 99% respectively under the conditions of atmospheric pressure, 2 h－1 and a wide temperature range from 220 ℃ to 360 ℃.-
Key words:
- MTBE /
- aluminum silicate catalyst /
- isobutene
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