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n(SiO_2)/n(Al_2O_3)对MCM-22分子筛的结晶度及烷基化性能的影响 被引量:3

Influence of n(SiO_2)/n(Al_2O_3) on the Crystallinity and Alkylation Performance of MCM-22 Zeolite
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摘要 试验考察了n(SiO2)/n(Al2O3)=12~90的范围内,硅铝比对MCM22分子筛的结晶度及烷基化性能的影响。结果表明,在固定结晶时间5天、结晶温度150℃的条件下,当n(SiO2)/n(Al2O3)=30~90时容易得到结晶度较高的纯相样品,随着硅铝比的增大,结晶度略有降低;B酸量呈现先增加后降低的趋势,L酸量基本呈现下降趋势。当n(SiO2)/n(Al2O3)=12~30时,水硅比的范围更窄,只有当n(H2O)/n(SiO2)≥25时才能得到纯相样品,但结晶度降低。在苯与丙烯的烷基化反应中,相同条件下n(SiO2)/n(Al2O3)=18~30时,MCM22分子筛的催化活性最高,降低或增大硅铝物质的量比,活性逐渐降低。 Experiments showed that in the synthesis of MCM - 22 zeolite, the product with high crystallinity could be easily prepared when n(SiO2)/n(Al2O3) ranged from 30 to 90, and the product with low crystallinity could be obtained only under the condition of n(H2O)/n(SiO2)≥25 when n(SiO2)/n(Al2O3) ranged from 12 to 30.The alkylation of benzene with propylene was investigated over MCM- 22. The results indicated that the zeolite with n(SiO2)/n(Al2O3) from 18 to 30 had the highest activity, and the activity gradually declined when n ( SiO2 )/n ( Al2O3 )increased or decreased beyond the range. At the same time,the selectivity of cumene gradually increased. When n(SiO2)/n(Al2O3) ranged from 30 to 90, the amount of B acid first increased and then decreased, while the amount of L acid basically decreased.
出处 《化工进展》 EI CAS CSCD 北大核心 2005年第8期885-888,共4页 Chemical Industry and Engineering Progress
关键词 MCM-22分子筛 合成 丙烯 异丙苯 烷基化 硅铝物质的量比 MCM-22 zeolite synthesis benzene propylene cumene alkylation
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  • 1刘冠华,左丽华,舒兴田,何鸣元.β沸石合成方法(一)[P]中国专利:CN1108213.

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