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Study of the properties of supported Pd catalysts for steam and autothermal reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
39842 45837 2014 14 PDF Available
Title
Study of the properties of supported Pd catalysts for steam and autothermal reforming of methane
Abstract

•La-containing Pd catalysts exhibit the highest TOFsCH4TOFsCH4 in SR of methane.•La-containing Pd catalysts show a high stability in ATR of methane due to the small particle size.•A relation between the particle size and the kind of carbon formation is found.

The effect of support kind on the structure, surface properties and catalytic behavior of Pd catalysts supported on alumina and mixed La2O3–Al2O3 oxides, prepared by impregnation and sol–gel method was studied. It was found that the catalytic performances of Pd catalysts in steam reforming (SR) and autothermal reforming (ATR) of methane were significantly affected by the kind of support. The highest specific reaction rate and TOFsCH4TOFsCH4 of La-containing Pd catalysts in SRM were related to the electronic interaction between Pd and modified alumina support surface with La oxide species and formation of Pd0[Pdδ+OxLa] like species, promoting the CH4 activation and carbon oxidation. Despite the filamentous carbon formation these catalysts exhibited the highest activity and stability in ATR caused by the presence of small Pd particles with average particle size of about 14–17 nm. It was shown that the wide particle size distribution up to 70 nm and the formation of encapsulated carbon species are responsible for the fast deactivation of non-La promoted Pd/Al catalyst.

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Keywords
Hydrogen; Methane reforming; Pd catalysts; La-modified alumina; Characterization
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Study of the properties of supported Pd catalysts for steam and autothermal reforming of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 256–269
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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