scholarly journals Influence of CO on Dry CH4 Oxidation on Pd/Al2O3 by Operando Spectroscopy: A Multitechnique Modulated Excitation Study

ACS Catalysis ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 4791-4804
Author(s):  
Valentina Marchionni ◽  
Maarten Nachtegaal ◽  
Davide Ferri
Keyword(s):  
Ch4 Oxidation ◽  
Operando Spectroscopy

Optimized Landfill Biocover for CH4 Oxidation II: Implications of Spatially Heterogeneous Fluxes for Monitoring and Emission Prediction

2016 ◽  
Vol 3 (2) ◽  
pp. 94-106 ◽  
Author(s):  
Inga Ute-Röwer ◽  
Jan Streese-Kleeberg ◽  
Heijo Scharff ◽  
Eva-Maria Pfeiffer ◽  
Julia Gebert
Keyword(s):  
Ch4 Oxidation

scholarly journals Increased Ir–Ir Interaction in Iridium Oxide during the Oxygen Evolution Reaction at High Potentials Probed by Operando Spectroscopy

ACS Catalysis ◽  
2021 ◽  
pp. 10043-10057
Author(s):  
Steffen Czioska ◽  
Alexey Boubnov ◽  
Daniel Escalera-López ◽  
Janis Geppert ◽  
Alexandra Zagalskaya ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Iridium Oxide ◽  
Operando Spectroscopy ◽  
High Potentials

A decade+ of operando spectroscopy studies

2017 ◽  
Vol 283 ◽  
pp. 27-53 ◽  
Author(s):  
Anisha Chakrabarti ◽  
Michael E. Ford ◽  
Daniel Gregory ◽  
Rongrong Hu ◽  
Christopher J. Keturakis ◽  
...  
Keyword(s):  
Operando Spectroscopy ◽  
Spectroscopy Studies

Characterization of plasma catalytic decomposition of methane: role of atomic O and reaction mechanism

2021 ◽  
Author(s):  
Yudong Li ◽  
Jingkai Jiang ◽  
Michael Hinshelwood ◽  
Shiqiang Zhang ◽  
Peter Bruggeman ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Gas Phase ◽  
Vibrational Frequency ◽  
Catalyst Surface ◽  
Atmospheric Pressure Plasma ◽  
Catalytic Decomposition ◽  
Fold Increase ◽  
Co2 Absorption ◽  
Ch4 Oxidation ◽  
Frequency Changes

Abstract In this work, we investigated atmospheric pressure plasma jet (APPJ)-assisted methane oxidation over a Ni-SiO2/Al2O3 catalyst. We evaluated possible reaction mechanisms by analyzing the correlation of gas phase, surface and plasma-produced species. Plasma feed gas compositions, plasma powers, and catalyst temperatures were varied to expand the experimental parameters. Real-time Fourier-transform infrared spectroscopy (FTIR) was applied to quantify gas phase species from the reactions. The reactive incident fluxes generated by plasma were measured by molecular beam mass spectroscopy (MBMS) using an identical APPJ operating at the same conditions. A strong correlation of the quantified fluxes of plasma-produced atomic oxygen with that of CH4 consumption, and CO and CO2 formation implies that O atoms play an essential role in CH4 oxidation for the investigated conditions. With the integration of APPJ, the apparent activation energy was lowered and a synergistic effect of 30% was observed. We also performed in-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) to analyze the catalyst surface. The surface analysis showed that surface CO abundance mirrored the surface coverage of CHn at 25 oC. This suggests that CHn adsorbed on the catalyst surface as an intermediate species that was subsequently transformed into surface CO. We observed very little surface CHn absorbance at 500 oC, while a ten-fold increase of surface CO and stronger CO2 absorption were seen. This indicates that for a nickel catalyst at 500 oC, the dissociation of CH4 to CHn may be the rate-determining step in the plasma-assisted CH4 oxidation for our conditions. We also found the CO vibrational frequency changes from 2143 cm-1 for gas phase CO to 2196 cm-1 for CO on a 25 oC catalyst surface, whereas the frequency of CO on a 500 oC catalyst was 2188 cm-1. The change in CO vibrational frequency may be related to the oxidation of the catalyst.

The effects of acid nitrogen and acid sulphur deposition on CH4 oxidation in a forest soil: a laboratory study

2001 ◽  
Vol 33 (12-13) ◽  
pp. 1695-1702 ◽  
Author(s):  
M.A Bradford ◽  
P Ineson ◽  
P.A Wookey ◽  
H.M Lappin-Scott
Keyword(s):  
Forest Soil ◽  
Laboratory Study ◽  
Ch4 Oxidation ◽  
Sulphur Deposition

Support effect on the catalytic performance of Au/Co3O4–CeO2 catalysts for CO and CH4 oxidation

2008 ◽  
Vol 139 (3) ◽  
pp. 174-179 ◽  
Author(s):  
L.F. Liotta ◽  
G. Di Carlo ◽  
A. Longo ◽  
G. Pantaleo ◽  
A.M. Venezia
Keyword(s):  
Catalytic Performance ◽  
Support Effect ◽  
Ch4 Oxidation

scholarly journals Biogeochemistry of manganese in ferruginous Lake Matano, Indonesia

2011 ◽  
Vol 8 (10) ◽  
pp. 2977-2991 ◽  
Author(s):  
C. Jones ◽  
S. A. Crowe ◽  
A. Sturm ◽  
K. L. Leslie ◽  
L. C. W. MacLean ◽  
...  
Keyword(s):  
Water Column ◽  
Transport Modeling ◽  
Ch4 Oxidation ◽  
X Ray ◽  
Lake Matano ◽  
Sinking Particles ◽  
Modern Analogue ◽  
Reaction Transport ◽  
Kinetics Of ◽  
Mn Oxides

Abstract. This study explores Mn biogeochemistry in a stratified, ferruginous lake, a modern analogue to ferruginous oceans. Intense Mn cycling occurs in the chemocline where Mn is recycled at least 15 times before sedimentation. The product of biologically catalyzed Mn oxidation in Lake Matano is birnessite. Although there is evidence for abiotic Mn reduction with Fe(II), Mn reduction likely occurs through a variety of pathways. The flux of Fe(II) is insufficient to balance the reduction of Mn at 125 m depth in the water column, and Mn reduction could be a significant contributor to CH4 oxidation. By combining results from synchrotron-based X-ray fluorescence and X-ray spectroscopy, extractions of sinking particles, and reaction transport modeling, we find the kinetics of Mn reduction in the lake's reducing waters are sufficiently rapid to preclude the deposition of Mn oxides from the water column to the sediments underlying ferruginous water. This has strong implications for the interpretation of the sedimentary Mn record.

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