Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Ortloff, Felix; Bohnau, Jan; Graf, Frank; Kolb, Thomas

doi:10.1016/j.apcatb.2015.09.025

Cited by 20 publications

(19 citation statements)

References 31 publications

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“…EleyRideal presumes oxygen to be present in excess at the active sites of the catalyst at any time. Validity of this mechanism was confirmed in [41] for very low oxygen partial pressures as used in this work. Thus the partial pressure of oxygen shows no influence on the rate of reaction (r CH4 ~ p O2 0 ).…”

Section: At T = 240 °C (…); Y So20 At T = 290 °C: (---)supporting

confidence: 63%

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Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Ortloff

Bohnau

Kramar

et al. 2016

Applied Catalysis B: Environmental

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This work focuses on the deactivation and in-situ regeneration effects of a commercial PdO/Al 2 O 3 catalyst for removal of oxygen by oxidation of CH 4 at low O 2 :CH 4 ratios when hydrogen sulfide and sulfur dioxide are applied. The experimental work is carried out at an operating temperature range of 200 °C < T < 300 °C, atmospheric pressures and H 2 S contents of < 50 ppmv. SO 2 and H 2 S show a different behavior in the examined range of operating conditions. Due to the low operating temperatures and low oxygen contents applied in this work, it was possible to identify an intermediate species, presumably PdSO 3 , with an increased activity for the oxidation of methane. This stands in contrast to the literature, where SO 2 typically causes catalyst deactivation. Based on the experimental results, a reaction scheme was derived and kinetic measurements for each of the participating reactions were carried out separately.

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Section: At T = 240 °C (…); Y So20 At T = 290 °C: (---)supporting

confidence: 63%

“…Recently, kinetic data for the catalytic removal of oxygen by combustion of CH 4 for very low O 2 :CH 4 ratios was determined for a set of reference catalysts on noble metal basis (platinum and palladium on Al 2 O 3 support) [41].…”

Section: Introductionmentioning

confidence: 99%

Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Ortloff

Bohnau

Kramar

et al. 2016

Applied Catalysis B: Environmental

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“…In these cases, catalytic oxygen conversion can be a cost‐effective and, therefore, economical option , . The challenge is to catalytically remove traces of oxygen from multi‐component gas mixtures such as those found in industry , . Tab.…”

Section: Low Oxygen Concentration In Coke Oven Gasmentioning

confidence: 99%

“…The research group Kolb et al investigated the conversion of small amounts of oxygen depending on different methane concentrations on a 0.5 wt % Pt/Al 2 O 3 catalyst . The oxygen concentration was varied between 1000 – 8000 ppm.…”

Section: Low Oxygen Concentration In Coke Oven Gasmentioning

confidence: 99%

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Techniques to Remove Traces of Oxygen by Catalytic Conversion from Gas Mixtures

Wiesmann¹,

Hamel²,

Kaluza³

2018

Chemie Ingenieur Technik

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This review presents the technical possibilities of removing traces of oxygen in process gases. The processes are divided into physical and chemical processes. The focus is on the catalytic removal of oxygen traces in gas streams. The descriptions present catalyst systems based on precious metals and non‐precious metals. In most studies, methane, which is present in excess, is converted with small amounts of oxygen (< 1 vol %). The reaction‐inhibiting gases examined were carbon dioxide and water vapor.

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Methods for the Trace Oxygen Removal from Methane‐Rich Gas Streams

et al. 2016

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Oxygen removal to very low residual contents in methane-rich gas streams and carbon dioxide as co-component (simulated biogas) was achieved via three different methods at various temperatures, namely, by reduction with hydrogen admixtures on Pt/g-Al 2 O 3 catalysts, by oxygen absorption affinity of YBaCo 4 O 7+d , and by the catalytic reaction with methane on both the materials, respectively. The three methods have characteristic advantages and disadvantages which are discussed in the context of existing methods for gas treatments focused on oxygen removal. Finally, the advantage of dielectric radio-frequency heating on the powdered functional materials is suggested as alternative to conventional routes.

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Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Cited by 20 publications

References 31 publications

Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Techniques to Remove Traces of Oxygen by Catalytic Conversion from Gas Mixtures

Methods for the Trace Oxygen Removal from Methane‐Rich Gas Streams

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