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11C-Radiolabeling study of methanol decomposition on chromium modified SBA-15 silica

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Abstract

Chromium modified mesoporous SBA-15 silica was prepared by incipient wetness impregnation of the silica support with toluene solution of chromium acetylacetonate. Powder X-ray diffraction, Nitrogen physisorption, FTIR, UV–Vis and XPS techniques as well as temperature programmed reduction with hydrogen were used for the characterization of the obtained materials. The catalytic behaviour of the samples was tested in methanol decomposition to CO and hydrogen. Novel catalytic radio isotopic based method was applied for the elucidation of the role of different chromium surface species in the catalytic process. This approach is based on the selective coverage of the surface active sites with 11C- and 12C-methanol and simultaneous observation of the products of their conversion. It was found that the supported active phase represents a complex mixture of chromium oxide nanoparticles (mainly Cr2O3, CrO3) and anchored to the silica surface mono- and polychromate structures. It was established that these species differ significantly in their catalytic behavior during the methanol decomposition and the reaction mechanism of the formation of different products was discussed.

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Acknowledgments

Financial support by Bulgarian Academy of Sciences, the Bulgarian-Hungary interacademic exchange, National Scientific Found of Bulgarian Ministry of Education and Science (project DO 02-184) is gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Nuclear Research, Hungarian Academy of Science, Debrecen, Hungary

    Eva Sarkadi-Priboczki

  2. Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria

    Tanya Tsoncheva

Authors
  1. Eva Sarkadi-Priboczki
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  2. Tanya Tsoncheva
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Correspondence to Tanya Tsoncheva.

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Sarkadi-Priboczki, E., Tsoncheva, T. 11C-Radiolabeling study of methanol decomposition on chromium modified SBA-15 silica. J Porous Mater 19, 705–711 (2012). https://doi.org/10.1007/s10934-011-9522-5

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