Selective oxidation of methane to formaldehyde by oxygen over SBA-15-supported molybdenum oxides

Yinchuan Lou; Qinghu Tang; Hongru Wang; Beitian Chia; Ye Wang; Yanhui Yang

doi:10.1016/j.apcata.2008.08.006

Selective oxidation of methane to formaldehyde by oxygen over SBA-15-supported molybdenum oxides

Yinchuan Lou, Qinghu Tang, Hongru Wang, Beitian Chia, Ye Wang, Yanhui Yang

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The selective oxidation of CH₄ to formaldehyde by oxygen and its kinetics studies were investigated over MoO_x/SBA-15 under atmospheric pressure. The comparative studies on catalytic reaction showed that the activity of polymeric MoO_x species was significantly higher than that of isolated MoO_x. The maximum HCHO yield was achieved over 20 wt% MoO_x/SBA-15 catalyst at 873 K. Although the studies on contact time effect indicated that HCHO was the primary product over both isolated and polymeric Mo species, the CH₄ conversion followed different mechanisms: the reaction over isolated MoO_x species was a first-order reaction, whereas the other was a higher-order reaction. The catalytic activity of SBA-15-supported Mo-V-O mixed oxide was also investigated in this study. Hydrogen temperature-programmed reduction (H₂-TPR), UV-visible (UV-vis) spectroscopy and X-ray photoelectron spectra (XPS) studies were performed to characterize the supported MoO_x species, results showed that the nature of MoO_x species remained unchanged during the reaction.

Original language	English
Pages (from-to)	118-125
Number of pages	8
Journal	Applied Catalysis A: General
Volume	350
Issue number	1
DOIs	https://doi.org/10.1016/j.apcata.2008.08.006
State	Published - 15 Nov 2008
Externally published	Yes

Keywords

CH selective oxidation
Isolated MoO
Kinetics study
Mo-V-O mixed oxide
Polymeric MoO

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10.1016/j.apcata.2008.08.006

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title = "Selective oxidation of methane to formaldehyde by oxygen over SBA-15-supported molybdenum oxides",

abstract = "The selective oxidation of CH4 to formaldehyde by oxygen and its kinetics studies were investigated over MoOx/SBA-15 under atmospheric pressure. The comparative studies on catalytic reaction showed that the activity of polymeric MoOx species was significantly higher than that of isolated MoOx. The maximum HCHO yield was achieved over 20 wt% MoOx/SBA-15 catalyst at 873 K. Although the studies on contact time effect indicated that HCHO was the primary product over both isolated and polymeric Mo species, the CH4 conversion followed different mechanisms: the reaction over isolated MoOx species was a first-order reaction, whereas the other was a higher-order reaction. The catalytic activity of SBA-15-supported Mo-V-O mixed oxide was also investigated in this study. Hydrogen temperature-programmed reduction (H2-TPR), UV-visible (UV-vis) spectroscopy and X-ray photoelectron spectra (XPS) studies were performed to characterize the supported MoOx species, results showed that the nature of MoOx species remained unchanged during the reaction.",

keywords = "CH selective oxidation, Isolated MoO, Kinetics study, Mo-V-O mixed oxide, Polymeric MoO",

author = "Yinchuan Lou and Qinghu Tang and Hongru Wang and Beitian Chia and Ye Wang and Yanhui Yang",

year = "2008",

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doi = "10.1016/j.apcata.2008.08.006",

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T1 - Selective oxidation of methane to formaldehyde by oxygen over SBA-15-supported molybdenum oxides

AU - Lou, Yinchuan

AU - Tang, Qinghu

AU - Wang, Hongru

AU - Chia, Beitian

AU - Wang, Ye

AU - Yang, Yanhui

PY - 2008/11/15

Y1 - 2008/11/15

N2 - The selective oxidation of CH4 to formaldehyde by oxygen and its kinetics studies were investigated over MoOx/SBA-15 under atmospheric pressure. The comparative studies on catalytic reaction showed that the activity of polymeric MoOx species was significantly higher than that of isolated MoOx. The maximum HCHO yield was achieved over 20 wt% MoOx/SBA-15 catalyst at 873 K. Although the studies on contact time effect indicated that HCHO was the primary product over both isolated and polymeric Mo species, the CH4 conversion followed different mechanisms: the reaction over isolated MoOx species was a first-order reaction, whereas the other was a higher-order reaction. The catalytic activity of SBA-15-supported Mo-V-O mixed oxide was also investigated in this study. Hydrogen temperature-programmed reduction (H2-TPR), UV-visible (UV-vis) spectroscopy and X-ray photoelectron spectra (XPS) studies were performed to characterize the supported MoOx species, results showed that the nature of MoOx species remained unchanged during the reaction.

AB - The selective oxidation of CH4 to formaldehyde by oxygen and its kinetics studies were investigated over MoOx/SBA-15 under atmospheric pressure. The comparative studies on catalytic reaction showed that the activity of polymeric MoOx species was significantly higher than that of isolated MoOx. The maximum HCHO yield was achieved over 20 wt% MoOx/SBA-15 catalyst at 873 K. Although the studies on contact time effect indicated that HCHO was the primary product over both isolated and polymeric Mo species, the CH4 conversion followed different mechanisms: the reaction over isolated MoOx species was a first-order reaction, whereas the other was a higher-order reaction. The catalytic activity of SBA-15-supported Mo-V-O mixed oxide was also investigated in this study. Hydrogen temperature-programmed reduction (H2-TPR), UV-visible (UV-vis) spectroscopy and X-ray photoelectron spectra (XPS) studies were performed to characterize the supported MoOx species, results showed that the nature of MoOx species remained unchanged during the reaction.

KW - CH selective oxidation

KW - Isolated MoO

KW - Kinetics study

KW - Mo-V-O mixed oxide

KW - Polymeric MoO

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DO - 10.1016/j.apcata.2008.08.006

M3 - 文章

AN - SCOPUS:52949139403

SN - 0926-860X

VL - 350

SP - 118

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1

ER -

Selective oxidation of methane to formaldehyde by oxygen over SBA-15-supported molybdenum oxides

Abstract

Keywords

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