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

Paper ID Volume ID Publish Year Pages File Format Full-Text
43177 45957 2009 6 PDF Available
Title
Microwave assisted in situ synthesis of USY-encapsulated heteropoly acid (HPW-USY) catalysts
Abstract

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. 31P MAS NMR, transmission electron microscopy (HR-TEM), N2 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 Brönsted 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.

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Keywords
12-Tungstophosphoric acid; USY; Encapsulation; Microwave irradiation
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Microwave assisted in situ synthesis of USY-encapsulated heteropoly acid (HPW-USY) catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 352, Issues 1–2, 15 January 2009, Pages 259–264
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us