Oxidative CO2 reforming of methane on alumina-supported Co-Ni catalyst

Say Yei Foo, Chin Kui Cheng, Tuan Huy Nguyen, Adesoji A. Adesina

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

CO2 reforming of CH4 in the presence of O2 in the feed has been investigated in a fixed bed reactor containing a Co-Ni catalyst. The reforming rate increased with O2 partial pressure before leveling out at O2:CH4 = 1 at temperature greater than 823 K. Although CO production decreased with O2 addition, H 2 formation initially rose to a maximum before a slow decline. An expression relating the optimum O2 partial pressure for H2 production as a function of temperature was obtained as, PO2,max = 1.008 × 10-3e8420/T. The H2:CO product ratio increased from 0.9 for pure CO2 reforming and peaked at 1.73 as O2 partial pressure increased to an equimolar level in the feed. The increased reaction temperature resulted in lower H2:CO due to increased CO2 reforming kinetics. The complete consumption of O 2 in the final product stream means that the oxidative CO2 reforming of CH4 may be used to generate nearly ideal syngas composition for Fischer-Tropsch synthesis if feed CO2:CH4 is unity. In particular, the overall heat demand for the reforming reaction could be reduced (or become exothermic) for a judicious combination of CO 2/CH4/O2. The postreaction analysis revealed that even mild O2 dosing leads to negligible carbon deposition. Thus, this form of reactor operation is energetically attractive and provided efficient carbon utilization.

Original languageBritish English
Pages (from-to)10450-10458
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume49
Issue number21
DOIs
StatePublished - 3 Nov 2010

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