两步晶化法制备介孔材料及其催化性能研究

doi:10.3724/SP.J.1077.2010.00272

摘要/Abstract

摘要： 采用两步晶化法,由MCM-22沸石前驱体合成了一种介孔材料.通过XRD、N₂吸附脱附、TEM、^27Al MAS NMR以及吡啶吸附红外光谱等技术对样品进行了表征.结果显示所合成的样品不是微孔沸石与介孔材料的混合物,而是含强酸性中心、水热稳定性良好的新型介孔分子筛.利用异丙苯的裂解反应、苯和1十二烯烃的烷基化反应,评价了其对大分子的酸催化活性,并与常规介孔材料MCM-41进行了比较.在350℃时,所合成的介孔材料和常规介孔材料MCM-41对异丙苯的裂解转化率分别为68.98%和48.80%.在210℃苯和1十二烯烃的烷基化反应时,所合成的介孔材料和MCM41对1十二烯烃的转化率分别约为95.20%和86.89%,产物直链烷基苯的选择性分别约为88.11%和90.06%.结果表明所合成的介孔材料对大分子的酸催化性能优越于常规介孔材料MCM-41

关键词: 介孔材料, 两步晶化法, 制备, 催化性能

Abstract: A mesoporous material was synthesized by using the precursor of MCM22 zeolite through a twostep synthesis route, and characterized by XRD, N2 physical adsorptiondesorption, TEM, 27Al MAS NMR, IR spectra of pyridine adsorbed methods and so on. It was found that the synthesized sample was not a mixture of microporous zeolite and mesoporous material but a new mesoporous molecular sieve with strong acid sites and good thermal stability. The acid catalytic activity for macromolecules was evaluated and compared with conventional mesoporous material MCM-41 through the cracking reaction of cumene and alkylation reaction of benzene with 1dodecen. The results show that the conversions of cumene cracking at 350℃ over the new mesoporous material and MCM-41 are 68.98% and 48.80%, respectively. For the alkylation reaction of benzene with 1dodecen at 210℃, the conversions of 1dodecen over the new mesoporous materials and MCM-41 are around 95.20% and 86.89%, respectively. The selectivities of linear alkylbenzene over the new mesoporous materials and MCM-41 are around 88.11% and 90.06%, respectively. The results show that the catalytic property of the new mesoporous materials for macromolecules is superior to that of MCM-41.

Key words: mesoporous material, two-step crystallization, synthesis, catalytic performance

中图分类号:

O643

刘维桥,尚通明,李工,吴非克,佟惠娟2,孙予罕. 两步晶化法制备介孔材料及其催化性能研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00272.

LIU Wei-Qiao,SHANG Tong-Ming,LI Gong,WU Fei-Ke,TONG Hui-Juan,SUN Yu-Han. Synthesis and Catalytic Performance of Mesoporous Material by Twostep Crystallization[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00272.

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