Papers by Keyword: Methane Combustion

Abstract: This paper introduces several kinds of reactors for methane catalytic combustion. Furthermore, we briefly summarize and compare advantages, disadvantages, research progresses and experimental applications of fixed-bed reactor, catalytic fluidized-bed reactor, catalytic reverse flow reactor, micro-channel reactor and catalytic membrane reactor for methane catalytic combustion.

Abstract: The sulfur tolerance over palladium supported on pure alumina and on alumina modified with barium of catalytic combustion of methane is investigated. Characterization of the catalysts is performed by, XRD and H₂-TPR techniques. Barium nitrate as the precursor to the formation of Ba(NO₂)₂ species can inhibit the SO₂ and SO₃ overflow from Al₂(SO₃)₃ and Al₂(SO₄)₃ sulfate to the adjacent PdO. Ba content on the performance of the catalyst resistance to sulfur poisoning has important implications. 0.7% Ba-1% Pd/Al₂O₃ catalyst resistance to sulfur poisoning property is close to that of high load capacity 5% Pd/Al₂O₃ catalyst.

Abstract: Influence of steam, loading amounts of Pd (viz., 0.7, 2.1, 5.4 wt %) and other process parameters (viz. GHSV and temperature) on methane-based MCFC anodeeffluents over Pd-based La2O3-Al2O3 supported on honeycomb substrate have been investigated. TGA study reveals precise temperature of decomposition of Pd-O in catalytic combustion at high temperature. An increase in methane conversion at elevated temperature is attributable to decomposition of PdO to Pd active phase. The XRD analysis of spent catalysts suggests that the reflections corresponding to PdO gradually become weaker with increase in the Pd loading. The addition of 4% water in the feed decreases the methane conversion due to the reversible reaction of PdO with water adduct resulting in the formation of inactive Pd(OH)2 phase. However, the methane conversion remains unaffected and increases monotonously with 100% water concentration in the feed.