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HZSM-5 treated with ammonia and water vapor: Characterization and cracking activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
55182 47043 2012 7 PDF Available
Title
HZSM-5 treated with ammonia and water vapor: Characterization and cracking activity
Abstract

HZSM-5 was treated with ammonia water vapor at 373 and 473 K, and the catalytic activities for alkane cracking were evaluated. The treatment removed a fraction of silicon from the framework, but the meso-pore was not generated and the micro-pore volume was decreased. The solid acidity was characterized by infrared/mass spectroscopy-temperature programmed desorption (IRMS-TPD) of ammonia experiment. Two kinds of Brønsted acid sites were observed on the unmodified HZSM-5, and the solid acidity did not change largely by the treatment. Catalytic cracking of hexane and octane was enhanced by the treatment, and the second order reaction of cracking became accompanied with the first order reaction. From the products distribution in the propane cracking, the proceeding of bimolecular reaction was confirmed. Discussion was made on the morphology change of the modified HZSM-5 and the resulting enhanced cracking activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (164 K)Download as PowerPoint slideHighlights► HZSM-5 was treated with ammonia water vapor at 373–473 K. ► Desilication occurred, but the meso-pore was not generated unlike as the NaOH treatment. ► Solid acidity was little altered. ► Cracking activity was enhanced, and bimolecular cracking was accompanied with usual monomolecular reaction. ► Generation of spatially unrestricted active site which enabled the bimolecular reaction was estimated.

Keywords
HZSM-5; Ammonia water vapor treatment; Alkane cracking; Monomolecular and bimolecular reaction; Ammonia TPD
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HZSM-5 treated with ammonia and water vapor: Characterization and cracking activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 198, Issue 1, 30 December 2012, Pages 12–18
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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