| 安良成.高浓度体系小晶粒B改性ZSM-5分子筛的制备及甲醇制丙烯催化性能[J].分子催化,2016,30(1):10-19 |
| 高浓度体系小晶粒B改性ZSM-5分子筛的制备及甲醇制丙烯催化性能 |
| High Concentration Synthesis of mall crystal B-modified ZSM-5 Zeolites and Their Catalytic Performance for Methanol to Propylene Reaction |
| 投稿时间：2016-01-14 修订日期：2016-01-25 |
| DOI： |
| 中文关键词: 高浓度体系 小晶粒 B改性 ZSM-5 甲醇制丙烯 |
| 英文关键词:High concentration system small crystal B-modified ZSM-5 Methanol to propylene |
| 基金项目:国家自然科学基金国际(地区)合作与交流(批准号：2015DFA40660)项目 |
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| 中文摘要: |
| 在高浓度体系(n(H2O):n(SiO2)＜4)下，以粗孔硅胶和偏铝酸钠为原料，TPABr为模板剂，水热晶化法制备了小晶粒B改性ZSM-5分子筛，单釜产率达50%以上。采用XRD、FT-IR、SEM、NH3-TPD、XRF、N2物理吸附等方法对其结构进行了表征，评价了其在甲醇制丙烯(MTP)反应中的催化性能。结果表明，制备的小晶粒B改性ZSM-5分子筛粒度分布均匀，粒径约500 nm。在MTP反应中，B改性的样品比未改性样品含有更多的弱酸位，表现出更好的的活性、选择性和稳定性，其中n(Al2O3):n(B2O3)=1:1的样品效果最好，甲醇转化率在95%以上运行476 h，丙烯平均选择性46.32%。 |
| 英文摘要: |
| A small crystal B-modified ZSM-5 zeolites were synthesized by hydrothermal crystallization method and using macroporous silica gel and sodium aluminate as raw materials and TPABr as template. The batch yield was above 50%. The samples were characterized by XRD, FT-IR, SEM, NH3-TPD, XRF and nitrogen adsorption, and their catalytic performance for methanol to propylene(MTP) reaction were evaluated. Results showed that the synthesized all samples had uniform particle size distribution and the particle sizes were about 500 nm. In MTP process, the synthesized B-modified samples exhibited good activity, selectivity and stability, which were comparable to present sample with more weak acid sites and better products distribution, and the best sample was n(Al2O3):n(B2O3)=1:1, its methanol conversion maintained above 95% and the selectivity to propylene remained about46.23% even after running for 476 h． |
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