Low Temperature Complete Combustion of Lean Methane over Cobalt–Nickel Mixed‐Oxide Catalysts. Issue 4 (12th October 2016)

• Record Type: Journal Article
• Authors: Shao, Chunyu; Li, Wenzhi; Lin, Qizhao; Huang, Qifu; Pi, Dong
• Is Part Of: Energy technology. Volume 5:Issue 4(2017:Apr.)
• Page Start: 604
• Page End: 610
• Publication Date: 2016-10-12
• Subjects: combustion -- heterogeneous catalysis -- lean methane -- mixed oxides -- structure-property relationship; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201600402
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: Cobalt–nickel mixed oxides with different Co/Ni molar ratios were prepared by co‐precipitation and used for the catalytic combustion of lean methane. The catalytic performances for methane combustion were evaluated at steady‐state conditions at temperatures ranging from 250 to 500 °C, which were increased in step sizes of 25 °C. Among the catalysts, the cobalt–nickel mixed‐oxide catalysts with an appropriate Co/Ni ratio exhibit a high catalytic performance for the lean methane combustion, with the catalyst having a Co/Ni molar ratio of 1:4 showing the highest catalytic activity (methane conversion reached 100 % at 425 °C). On the basis of TEM and XRD results, the nanoparticles of the catalysts have a suitable interparticle spacing and more crystal defects. X‐ray photoelectron spectroscopy (XPS) results reveal a high number of surface‐active oxygen species and appropriate aliovalent cobalt ion numbers in the catalysts for high catalytic activity. All these effects contribute to the outstanding performance of these catalysts in the combustion of lean methane at low temperatures. Abstract : NiCo says: get me the right amount ! Cobalt–nickel mixed‐oxide catalysts with varying Co/Ni ratios are prepared and tested for lean methane combustion. The catalyst with a Co/Ni molar ratio of 1:4 exhibits the best catalytic performance among the prepared catalysts. Various characterization techniques are applied to investigate the relationship between structure and catalytic performance of these cobalt–nickel mixed oxides.