Kinetics of the complex oxidation of methane over supported palladium catalysts

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1092· OSTI ID:7036594

Ribeiro, F H; Chow, M; Dalla Betta, R A ^[1]

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1. Catalytica Inc., Mountain View, CA (United States)

The complete oxidation of methane by supported Pd was studied in a reaction mixture of 2% CH[sub 4] in air at 550 K, and atmospheric pressure. The catalysts were Pd supported on Al[sub 2]O[sub 3] and ZrO[sub 2] deposited from PdCl[sub 2] or Pd(NH[sub 3])[sub 2](NO[sub 2])[sub 2] precursors. For the determination of how the turnover rate varies with the structure of the catalyst, the average Pd particle size on the series of catalysts was varied in the critical size range (1-10 nm). The number of active sites were measured before and after reaction by the method of H[sub 2] titration of adsorbed oxygen at 373 K. The number of active sites remained the same, although the rate per gram of catalyst increased with time on-stream for all catalysts. At steady-state, the turnover rate for the series of catalysts tested varied in the range 2 [times] 10[sup [minus]2] to 8 [times] 10[sup [minus]2] s[sup [minus]1] under the conditions of these experiments. It is concluded that the reaction is structure insensitive. In an investigation of the kinetics of methane oxidation on palladium, the reaction products were found to strongly inhibit the oxidation of methane. 32 refs., 6 figs., 4 tabs.

• OSTI ID: 7036594
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 146:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000 -- Natural Gas-- Transport
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& Storage
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
KINETICS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDATION
PALLADIUM
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS