Partial oxidation of methane to CO and H2 over nickel and/or cobalt containing ZrO2, ThO2, UO2, TiO2 and SiO2 catalysts

Choudhary, Vasant Ramchandra ; Rajput, A. M. ; Prabhakar, B. ; Mamman, A. S. (1998) Partial oxidation of methane to CO and H2 over nickel and/or cobalt containing ZrO2, ThO2, UO2, TiO2 and SiO2 catalysts Fuel, 77 (15). pp. 1803-1807. ISSN 0016-2361

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00162...

Related URL: http://dx.doi.org/10.1016/S0016-2361(98)00072-6

Abstract

The influence of different metal oxide supports (i.e. ZrO2, ThO2, UO2, TiO2 and SiO2) on the performance of Ni- and/or Co-containing catalysts [Ni and/or Co/MO2 mole ratio (where M=Zr, Th, U, Ti or Si)=1.0] in the oxidative methane-to-syngas conversion at very low contact time (GHSV=5.2×105 cm3 g-1 h-1 at STP) was investigated. The nickel-containing ZrO2, ThO2 and UO2 catalysts (with or without pre-reduction by hydrogen at 500°C) showed good performance in the process; the order of their performance is NiO-ThO2>NiO-UO2>NiO-ZrO2. The NiO-TiO2 showed appreciable catalytic activity only after its reduction at 800°C. However, this catalyst and the NiO-SiO2 catalyst showed poor performance in the process. These two catalysts are also deactivated very fast, mostly because of sintering of Ni and/or formation of catalytically inactive binary metal oxide phases by solid-solid reaction at the high catalyst calcination and/or catalytic reaction temperature. Although the Ni-containing ThO2, UO2 and ZrO2 catalysts showed good performance, carbon deposition on them during the process is fast. However, because of the addition of cobalt to these catalysts (with Co/Ni=1.0), the rate of carbon deposition on them in the process is drastically reduced. This Co addition however resulted in a significant decrease in both the conversion and selectivity; the decrease in the selectivity was small.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Oxidation of Methane to Syngas; Nickel Catalysts; Cobalt Catalysts; Ni-Co Catalysts
ID Code:10395
Deposited On:04 Nov 2010 05:19
Last Modified:04 Nov 2010 05:19

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