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Probing the role of a non-thermal plasma (NTP) in the hybrid NTP-catalytic oxidation of CH4
Authors:
Emma K.
Gibson
(University College London; UK Catalysis Hub)
,
C. Elena
Stere
(University of Manchester)
,
Bronagh
Curran-mcateer
(Queen's University of Belfast)
,
Wilm
Jones
(UK Catalysis; Cardiff Catalysis Institute, Cardiff University)
,
Giannantonio
Cibin
(Diamond Light Source)
,
Diego
Gianolio
(Diamond Light Source)
,
Alexandre
Goguet
(Queen's University of Belfast)
,
Peter
Wells
(UK Catalysis Hub; Diamond Light Source; University of Southampton)
,
C. Richard A.
Catlow
(UK Catalysis Hub; University College London)
,
Paul
Collier
(Johnson Matthey Technology Centre)
,
Peter
Hinde
(Johnson Matthey Technology Centre)
,
Christopher
Hardacre
(University of Manchester)
Co-authored by industrial partner:
Yes
Type:
Journal Paper
Journal:
Angewandte Chemie International Edition
State:
Published (Approved)
Published:
June 2017
Diamond Proposal Number(s):
12986
,
10306
Abstract: Three recurring hypothesis are often used to explain the effect of non-thermal plasma (NTP) on NTP-catalytic hybrid reactions, namely, modification or heating of the catalyst or the ability of plasma produced species to open up new reaction pathways. By directly monitoring the catalyst by X-ray absorption fine structure (XAFS) coupled with end of pipe mass spectrometry the NTP assisted CH4 oxidation over Pd/Al2O3 was investigated. This in situ study has shown that the catalyst did not undergo any significant structural changes under NTP conditions. However, the NTP did lead to the Pd nanoparticle temperature increasing but this temperature rise was insufficient to activate the thermal CH4 oxidation reaction. The contribution of a lower activation barrier alternative reaction pathway involving the formation of CH3(g) via electron impact reactions is proposed.
Journal Keywords: non-thermal plasma; EXAFS spectroscopy; oxidation; Heterogeneous Catalysis; Methane
Subject Areas:
Chemistry
Instruments:
B18-Core EXAFS