NDLI: Verifying the dominant catalytic cycle of the methanol-to-hydrocarbon conversion over SAPO-41

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Catalysis Science & Technology Vol - 4 Issue - 2

Catalysis Science & Technology Vol -3

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

Verifying the dominant catalytic cycle of the methanol-to-hydrocarbon conversion over SAPO-41

Content Provider	Royal Society of Chemistry (RSC)
Author	Hunger, Michael Wang, Xin Li, Landong Guan, Naijia Dai, Weili Wu, Guangjun
Copyright Year	2014
Abstract	In the present work, the mechanism of the methanol-to-hydrocarbon (MTH) conversion over the silicoaluminophosphate SAPO-41 with one-dimensional 10-ring pores has been investigated. For this purpose, catalytic experiments with co-feeding of reactants, in situ FTIR and UV/Vis spectroscopy, and 1H MAS NMR spectroscopy of used catalysts upon loading of ammonia were performed. Using these methods, only a low content of aromatics could be observed on the working SAPO-41 catalyst. These findings and the characteristic changes in the ethene selectivity during the co-feeding experiments indicate that alkylaromatics can be excluded as active hydrocarbon pool compounds on SAPO-41 applied as MTH catalysts. On the other hand, dienes and enylic carbenium ions were detected using FTIR and UV/Vis spectroscopy and the formation of amines by reaction of alkenes with ammonia was detected via1H MAS NMR spectroscopy. These results are experimental evidence that large olefins partially existing in their carbenium state dominate the catalytically active hydrocarbon pool on the working SAPO-41. Due to this dominant alkene-based reaction mechanism and the limited formation of aromatics, SAPO-41 is a suitable catalyst for the C3+C4 olefin as well as gasoline production.
Starting Page	688
Ending Page	696
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c3cy00740e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Ammonia Alkene Magic angle spinning Ethylene Alkane Reaction mechanism FB Vis Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Catalysis

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