Temperature-programmed surface reaction (TPSR)of CH4 synthesis by PdxNi100-x nanoparticles

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Title:	Temperature-programmed surface reaction (TPSR)of CH4 synthesis by PdxNi100-x nanoparticles
Authors:	Wang,KW;Chung,SR;Wei,YC;Lee,JF;Perng,TP
Contributors:	化學工程與材料工程學系
Keywords:	ALLOY NANOPARTICLES;SEGREGATION;CATALYSTS;METHANE;CO;HYDROGENATION;OXIDE;ADSORPTION;PALLADIUM;TPD/TPSR
Date:	2009
Issue Date:	2010-06-29 17:28:12 (UTC+8)
Publisher:	中央大學
Abstract:	A series of PdxNi100-x nanoparticles were prepared by the co-precipitation method and analyzed using a temperature-programmed surface reaction (TPSR) of their methanation reactions. ESCA measurement suggested that the as-prepared Pd-Ni alloys had Pd-core/Ni-shell structure. Surface Pd segregation occurred during H-2 reduction and resulted in a surface composition close to the nominal value. The TPSR experiments were performed by pre-adsorption of CO with H-2 to form methane. The peak temperature of methanation increased as Pd content increased, indicating that a methanation reaction is favored on Ni and Ni-rich alloy nanoparticles. For physical mixtures of Pd and Ni nanoparticles, methanation behaviors is similar to those of alloy nanoparticles; but the methanation temperatures of physical mixtures are always higher than those of alloy nanoparticles. This may be due to the formation of a Pd-enriched alloy surface layer during reduction in H-2 at 400 degrees C, or because the CO molecules adsorbed on the Pd sites spill over onto the Ni sites for methanation. Using TPSR technique and measuring methanation temperature, the top-most surface of such bimetallic nanoparticles can be probed. (C) 2009 Elsevier B. V. All rights reserved.
Relation:	APPLIED SURFACE SCIENCE
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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