Microwave assisted in situ synthesis of USY-encapsulated heteropoly acid (HPW-USY) catalysts

被引：50

作者：

Jin, Dingfeng ^{[1
]}

Gao, Jing ^{[1
]}

Hou, Zhaoyin ^{[1
]}

Guo, Yan ^{[1
]}

Lu, Xiuyang ^{[2
]}

Zhu, Yinghong ^{[3
]}

Zheng, Xiaoming ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Chem, Key Lab Appl Chem Zhejiang Prov, Hangzhou 310028, Zhejiang, Peoples R China

[2] Zhejiang Univ, Dept Chem & Biomech Engn, Hangzhou 310027, Zhejiang, Peoples R China

[3] Zhejiang Univ Technol, Coll Chem Engn & Mat, Hangzhou 310012, Zhejiang, Peoples R China

来源：

APPLIED CATALYSIS A-GENERAL | 2009年 / 352卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

12-Tungstophosphoric acid; USY; Encapsulation; Microwave irradiation; Y-TYPE ZEOLITE; LIQUID-PHASE REACTIONS; MN-ZN CATALYSTS; 12-MOLYBDOPHOSPHORIC ACID; 12-TUNGSTOPHOSPHORIC ACID; H3PW12O40; SHIP; DIMETHYLDIPHENYLMETHANE; SPECTROSCOPY; SUPERCAGES;

D O I：

10.1016/j.apcata.2008.10.020

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Under microwave irradiation, 12-tungstophosphoric acid (HPW) could be successfully synthesized in situ and encapsulated in the supercage of ultra stable Y (USY) in several minutes. But the framework of USY collapsed easily in traditional hydrothermal synthesis routine. P-31 MAS NMR, transmission electron microscopy (HR-TEM), N-2 adsorption, inductively coupled plasma (ICP) and X-ray diffraction (XRD) characterizations found that the formed HPW molecule located separately in the supercage of USY. Temperature-programmed desorption of NH3 (NH3-TPD) showed that HPW-USY exhibited stronger acidity than that of pure USY, and adsorbed pyridine infrared (Py-IR) disclosed that the concentration of Bronsted acid sites was enhanced. This hybrid solid acid exhibited higher activity in the synthesis of 4,4'-dimethyldiphenylmethane via toluene and formaldehyde and could be utilized as a solid acid catalyst in aqueous solutions. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：259 / 264

页数：6

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