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Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior

Paper ID Volume ID Publish Year Pages File Format Full-Text
41187 45879 2012 8 PDF Available
Title
Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior
Abstract

Methanol has been converted to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI. The gallium based zeotypes are analogous to H-ZSM-5, but the Brønsted acidity is introduced by framework incorporation of gallium rather than aluminum, which leads to lower intrinsic acid strength. In the methanol-to-hydrocarbons (MTH) process, H-ZSM-5 is subjected to coke formation leading to catalyst deactivation. Here we show that when the gallium containing zeotypes are employed in the MTH process, only insignificant amounts of coke are present in the deactivated catalysts, indicating distinct differences in deactivation mechanisms of the two different catalysts. This is investigated further through FT-IR measurements as well as catalytic experiments employing regenerated and steamed catalysts. From this it is concluded that the H-Ga-MFI is subjected to irreversible deactivation by steaming (hydrolysis) of the GaO bonds in the zeolite structure rather than coke deposition.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (363 K)Download as PowerPoint slideHighlights► Methanol is converted over conventional and mesoporous H-ZSM-5 and H-Ga-MFI. ► The rate of coke formation during conversion of methanol is very low for H-Ga-MFI. ► The H-ZSM-5 based zeolites deactivate through coke deposition. ► The gallium based zeotypes deactivate through steaming rather than coke deposition.

Keywords
Zeolite; Gallium; Methanol-to-hydrocarbons (MTH); Deactivation; Regeneration
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Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 290–297
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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