Preparation and evaluation of novel hydrous metal oxide (HMO)-supported noble metal catalysts

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Hydrous Metal Oxides (HMOs) are chemically synthesized materials that, because of their high cation exchange capacity, possess a unique ability to allow the preparation of highly dispersed supported-metal catalyst precursors with high metal loadings. This study evaluates high weight loading Rh/HMO catalysts with a wide range of HMO support compositions, including hydrous titanium oxide (HTO), silica-doped hydrous titanium oxide (HTO:Si), hydrous zirconium oxide (HZO), and silica-doped hydrous zirconium oxide (HZO:Si), against conventional oxide-supported Rh catalysts with similar weight loadings and support chemistries. Catalyst activity measurements for a structure-sensitive model reaction (n-butane hydrogenolysis) as a function of catalyst activation conditions show ... continued below

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12 p.

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Gardner, T.J.; McLaughlin, L.I.; Evans, L.R. & Datye, A.K. April 1, 1998.

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Description

Hydrous Metal Oxides (HMOs) are chemically synthesized materials that, because of their high cation exchange capacity, possess a unique ability to allow the preparation of highly dispersed supported-metal catalyst precursors with high metal loadings. This study evaluates high weight loading Rh/HMO catalysts with a wide range of HMO support compositions, including hydrous titanium oxide (HTO), silica-doped hydrous titanium oxide (HTO:Si), hydrous zirconium oxide (HZO), and silica-doped hydrous zirconium oxide (HZO:Si), against conventional oxide-supported Rh catalysts with similar weight loadings and support chemistries. Catalyst activity measurements for a structure-sensitive model reaction (n-butane hydrogenolysis) as a function of catalyst activation conditions show superior activity and stability for the ZrO{sub 2}, HZO, and HZO:Si supports, although all of the Rh/HMO catalysts have high ethane selectivity indicative of high Rh dispersion. For the TiO{sub 2}-, HTO-, and HTO:Si supported Rh catalysts, a significant loss of both catalyst activity and Rh dispersion is observed at more aggressive activation conditions, consistent with TiO{sub x} migration associated with SMSI phenomena. Of all the Rh/HMO catalysts, the Rh/HZO:Si catalysts appear to offer the best tradeoff in terms of high Rh dispersion, high activity, and high selectivity.

Physical Description

12 p.

Notes

OSTI as DE98005780

Source

  • 7. international symposium on scientific bases for the preparation of heterogeneous catalysts, Louvain-la-Neuve (Belgium), 1-4 Sep 1998

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  • Other: DE98005780
  • Report No.: SAND--98-0879C
  • Report No.: CONF-980908--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/671938 | External Link
  • Office of Scientific & Technical Information Report Number: 671938
  • Archival Resource Key: ark:/67531/metadc704706

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  • April 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 7:35 p.m.

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Gardner, T.J.; McLaughlin, L.I.; Evans, L.R. & Datye, A.K. Preparation and evaluation of novel hydrous metal oxide (HMO)-supported noble metal catalysts, report, April 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc704706/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.