Preparation and characterization of MCM-41 supported Pt-Al catalysts

doi:10.11949/j.issn.0438-1157.20180789

Abstract

Abstract:

The Pt-Al/MCM-41 catalysts were prepared by impregnation method, using mesoporous silica MCM-41 as carrier, anhydrous alcohol as dissolvent and AlCl₃ as accelerator. The catalysts were systematically characterized by X-ray diffraction assay, X-ray photoelectron spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, N2 adsorption-desorption and automatic chemical adsorption analyzer. The effects of different Pt-Al interaction sequences on the structure and performance of the catalysts were emphatically discussed, and the catalytic application in hydrosilylation was investigated. The results showed that different Pt-Al interaction sequences had an effect on degree of order and acidity of the catalysts and the dispersion of platinum particle, among them, the Pt-Al/MCM-41 catalyst has the relatively best degree of order, acidity and platinum dispersion. The order of influence of different catalysts on the conversion with reaction time in the hydrosilylation of heptamethyltrisiloxane and allyl polyether is Pt-Al/MCM-41 > Pt+Al/MCM-41 > Al-Pt/MCM-41 > Pt/MCM-41.

Key words: support, hydrosilylation, aluminum chloride, catalysis, reactivity

摘要：

以介孔硅MCM-41为载体、无水乙醇为溶剂、氯化铝为促进剂，采用浸渍法制备了Pt-Al/MCM-41催化剂。利用XRD、XPS、TEM、FTIR、N₂吸附-脱附、NH₃-TPD对催化剂进行了表征，重点讨论了不同Pt-Al负载顺序对催化剂结构和性能的影响，并将其应用于硅氢加成反应。结果表明，Pt和Al的负载顺序不同会影响催化剂的有序度、Pt颗粒的分散程度和酸性，其中，Pt-Al/MCM-41催化剂的有序度和Pt颗粒的分散程度相对最好，酸性相对较强。在七甲基三硅氧烷与烯丙醇聚氧乙烯醚的硅氢加成反应中，不同催化剂对七甲基三硅氧烷的转化率影响顺序为Pt-Al/MCM-41 > Pt+Al/MCM-41 > Al-Pt/MCM-41 > Pt/MCM-41。

关键词: 载体, 硅氢加成反应, 氯化铝, 催化, 活性

CLC Number:

TQ426.82

CHEN Xiuying, XIE Huilin, HU Wenbin, ZHOU Xinhua, ZHOU Hongjun, SHU Xugang. Preparation and characterization of MCM-41 supported Pt-Al catalysts[J]. CIESC Journal, 2018, 69(S1): 72-79.

陈秀莹, 谢慧琳, 胡文斌, 周新华, 周红军, 舒绪刚. MCM-41负载Pt-Al催化剂的制备及其表征[J]. 化工学报, 2018, 69(S1): 72-79.

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