Mesoporous synthetic clays : synthesis, characterization, and use as HDS catalyst supports.

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Mesoporous synthetic clays (MSCs) are obtained when polymer-containing silicate gels are hydrothermally crystallized to form layered magnesium silicate hectorite clays containing polymers that are incorporated in situ. Polyvinylpyrrolidone of several average molecular weights ranging from 10K to 1.3M, in gel loadings varying from 5-30 wt%, were used. The organic polymer template molecules were removed from synthetic polymer-clay complexes via calcination. Pore radii, surface areas, and pore volumes of the resulting porous inorganic networks were then measured. For the most part there is a direct correlation between both PVP molecular weight and polymer loading on the diameter of the average pore. ... continued below

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10 p.

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Bloomquist, C. A. A.; Carrado, K. A.; Marshall, C. L.; Seifert, S.; Wei, D. & Xu, L. August 10, 1999.

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Description

Mesoporous synthetic clays (MSCs) are obtained when polymer-containing silicate gels are hydrothermally crystallized to form layered magnesium silicate hectorite clays containing polymers that are incorporated in situ. Polyvinylpyrrolidone of several average molecular weights ranging from 10K to 1.3M, in gel loadings varying from 5-30 wt%, were used. The organic polymer template molecules were removed from synthetic polymer-clay complexes via calcination. Pore radii, surface areas, and pore volumes of the resulting porous inorganic networks were then measured. For the most part there is a direct correlation between both PVP molecular weight and polymer loading on the diameter of the average pore. In addition to conventional techniques, the polymer-clay materials were also characterized by small angle x-ray scattering to ascertain the disposition of the polymeric matrix. The MSC materials after calcination were examined as potential supports for hydrodesulfurization (HDS). They were loaded with a bimetallic Co/Mo catalyst system for comparison with a commercial Co/Mo alumina catalyst. Dibenzothiophene (DBT) diluted with hexadecane (0.75 wt% S) was utilized as a liquid feed for the HDS tests. This feed was chosen as a deep HDS test of a heavy model oil. The pore diameters of the MSC catalysts were found to have a strong effect on both the HDS activity and selectivity.

Physical Description

10 p.

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OSTI as DE00011853

Medium: P; Size: 10 pages

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  • Access in Nanoporous Materials II Symposium, Banff, Alberta (CA), 05/25/2000--05/28/2000

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  • Report No.: ANL/CHM/CP-99251
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11853
  • Archival Resource Key: ark:/67531/metadc621776

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  • August 10, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 6:59 p.m.

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Bloomquist, C. A. A.; Carrado, K. A.; Marshall, C. L.; Seifert, S.; Wei, D. & Xu, L. Mesoporous synthetic clays : synthesis, characterization, and use as HDS catalyst supports., article, August 10, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc621776/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.