On the reaction mechanism for methane partial oxidation over yttria/zirconia

A. G. Steghuis; J. G. Van Ommen; J. A. Lercher

doi:10.1016/S0920-5861(98)00330-7

On the reaction mechanism for methane partial oxidation over yttria/zirconia

A. G. Steghuis
, J. G. Van Ommen
, J. A. Lercher

University of Twente

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

43 Scopus citations

Abstract

Oxidation of methane over yttria/zirconia mixed oxide shows two parallel oxidation pathways, i.e. partial oxidation to CO+H₂+H₂O and full oxidation to CO₂+2H₂O. Both reactions proceed via a Mars van Krevelen mechanism with first order kinetics for methane and oxygen and are retarded by water. A mechanism is suggested in which methane is homolitically dissociated over O^-_(s) sites and via the formation and decomposition of a formaldehyde precursor reacted to CO, H₂ and H₂O. In parallel, CO₂ is obtained from decomposition of bicarbonate that is formed via further oxidation of dioxymethylene.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Catalysis Today
Volume	46
Issue number	2-3
DOIs	https://doi.org/10.1016/S0920-5861(98)00330-7
State	Published - 16 Nov 1998
Externally published	Yes

Keywords

Kinetics
Methane partial oxidation
Methane pulse
Yttria/zirconia

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10.1016/S0920-5861(98)00330-7

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title = "On the reaction mechanism for methane partial oxidation over yttria/zirconia",

abstract = "Oxidation of methane over yttria/zirconia mixed oxide shows two parallel oxidation pathways, i.e. partial oxidation to CO+H2+H2O and full oxidation to CO2+2H2O. Both reactions proceed via a Mars van Krevelen mechanism with first order kinetics for methane and oxygen and are retarded by water. A mechanism is suggested in which methane is homolitically dissociated over O-(s) sites and via the formation and decomposition of a formaldehyde precursor reacted to CO, H2 and H2O. In parallel, CO2 is obtained from decomposition of bicarbonate that is formed via further oxidation of dioxymethylene.",

keywords = "Kinetics, Methane partial oxidation, Methane pulse, Yttria/zirconia",

author = "Steghuis, \{A. G.\} and \{Van Ommen\}, \{J. G.\} and Lercher, \{J. A.\}",

note = "Funding Information: Financial support of the E.U. under contract JOU2-0073 is gratefully acknowledged.",

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T1 - On the reaction mechanism for methane partial oxidation over yttria/zirconia

AU - Steghuis, A. G.

AU - Van Ommen, J. G.

AU - Lercher, J. A.

N1 - Funding Information: Financial support of the E.U. under contract JOU2-0073 is gratefully acknowledged.

PY - 1998/11/16

Y1 - 1998/11/16

N2 - Oxidation of methane over yttria/zirconia mixed oxide shows two parallel oxidation pathways, i.e. partial oxidation to CO+H2+H2O and full oxidation to CO2+2H2O. Both reactions proceed via a Mars van Krevelen mechanism with first order kinetics for methane and oxygen and are retarded by water. A mechanism is suggested in which methane is homolitically dissociated over O-(s) sites and via the formation and decomposition of a formaldehyde precursor reacted to CO, H2 and H2O. In parallel, CO2 is obtained from decomposition of bicarbonate that is formed via further oxidation of dioxymethylene.

AB - Oxidation of methane over yttria/zirconia mixed oxide shows two parallel oxidation pathways, i.e. partial oxidation to CO+H2+H2O and full oxidation to CO2+2H2O. Both reactions proceed via a Mars van Krevelen mechanism with first order kinetics for methane and oxygen and are retarded by water. A mechanism is suggested in which methane is homolitically dissociated over O-(s) sites and via the formation and decomposition of a formaldehyde precursor reacted to CO, H2 and H2O. In parallel, CO2 is obtained from decomposition of bicarbonate that is formed via further oxidation of dioxymethylene.

KW - Kinetics

KW - Methane partial oxidation

KW - Methane pulse

KW - Yttria/zirconia

UR - https://www.scopus.com/pages/publications/0037634126

U2 - 10.1016/S0920-5861(98)00330-7

DO - 10.1016/S0920-5861(98)00330-7

M3 - Article

AN - SCOPUS:0037634126

SN - 0920-5861

VL - 46

SP - 91

EP - 97

JO - Catalysis Today

JF - Catalysis Today

IS - 2-3

ER -

On the reaction mechanism for methane partial oxidation over yttria/zirconia

Abstract

Keywords

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