NDLI: Elucidating the nature and role of Cu species in enhanced catalytic carbonylation of dimethyl ether over Cu/H-MOR

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Elucidating the nature and role of Cu species in enhanced catalytic carbonylation of dimethyl ether over Cu/H-MOR

Content Provider	Royal Society of Chemistry (RSC)
Author	Lv, Jing Li, Ying Wang, Shengping Zhan, Huimin Ma, Xinbin Huang, Shouying
Copyright Year	2015
Abstract	To investigate the role of Cu species in dimethyl ether (DME) carbonylation over Cu/H-MOR catalysts, ion-exchange with copper ammonia solution (Cu/H-M(x)) and solid state ion-exchange with CuCl (SSIE Cu/H-M(x)) methods were applied to prepare a series of samples with different Cu loadings. Compared to H-MOR, the reduced Cu/H-M(x) samples dramatically facilitated the conversion of DME, in which Cu+ and Cu0 species as well as Brønsted acid sites coexisted. Physical adsorption, powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) were carried out to prove the negligible influence of the preparation processes on the textural and morphological properties of MOR. Fourier transform infrared (FTIR) spectroscopy, adsorption of pyridine, CO temperature programmed desorption (CO-TPD), and X-ray photoelectron spectroscopy (XPS) were employed to qualitatively and quantitatively explore the variation of both Brønsted acid sites and Cu species in 8-membered ring (8-MR) and 12-membered ring (12-MR) channels. With an increase of the Cu dopant, the amount of Cu0 increased gradually while Cu+ had no obvious regularity. The relationship between Cu0 and catalyst activity was established for Cu/H-M(x) catalysts. In addition, the formation of methyl acetate (MA) over SSIE Cu/H-M(x) catalysts decreased sharply with increasing Cu+ loading, which further excluded the promoting effect of Cu+ species present in MOR.
Starting Page	4378
Ending Page	4389
Page Count	12
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00460h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Infrared spectroscopy Spectroscopy Acid Dimethyl ether Fourier transform Photoemission spectroscopy CO Copper(I) chloride X-ray crystallography Ammonia Cu Carbonylation Transmission electron microscopy Pyridine Fourier Adsorption Magnetic resonance imaging Dopant Methyl acetate Copper X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Catalysis

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