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

Abstract

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.

Catalytic Oxygen Removal from Synthetic Coke Oven Gas: A Comparison of Sulfided CoMo/γ‐Al2O3 and NiMo/γ‐Al2O3 Catalysts with Pt/γ‐Al2O3 as Benchmark Catalyst

“…Wiesmann et al summarized the state of research in the field of catalytic oxygen removal in a review article [8]. Methods for trace oxygen removal from methane-rich gas plants are explored in detail by Peppel et al [5]. This work presents the removal of catalytic oxygen from the synthetic coke oven gas.…”

“…The research of catalytic combustion using a noble-metal catalyst is the basis of the catalytic removal of oxygen. Platinum-based catalysts have mainly been studied for oxygen removal in hydrogen or methane excess, and the presence of carbon monoxide and water has also been considered [5,[9][10][11]. The current challenge deals with the investigation of the catalyst systems due to the multi-component gas mixture in terms of its very low oxygen content and the presence of catalyst poison, such as H 2 S. Catalytic performance of the noble metal catalysts, especially Pt/γ-Al 2 O 3 , has been intensively studied for the oxygen removal system, but they are also the most expensive materials.…”

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

“…The catalytic removal of traces of oxygen can be applied where oxygen must be removed from process gases to achieve higher added value. 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 , .…”

“…In the field of chemical processes, in addition to the possibility of catalytic conversion of components, there is the option of chemical adsorption and absorption processes. The literature mentions copper or chromium as adsorbents , , . Some recent papers report of iron‐based adsorbents .…”

“…With a possible feed of biogas into the natural gas network, oxygen components in the gas can lead to corrosion within the pipes and to oxidation of other components contained in the gas , . Therefore, the oxygen content in German natural gas networks is limited to 10 ppm by law , , . Another aspect is process safety.…”