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Title: Metal-support effects on the activity and selectivity of Ni catalysts in CO/H/sub 2/ synthesis reactions

Abstract

Titania-supported nickel catalysts exhibit unusual properties in CO--H/sub 2/ reactions relative to conventional nickel catalysts. The activity of Ni/TiO/sub 2/ is significantly greater than that of Ni powder or Ni on SiO/sub 2/, Al/sub 2/O/sub 3/, or graphite when compared on a per gram of catalyst basis or on the basis of specific activities determined from hydrogen chemisorption. In addition, the selectivity of Ni/TiO/sub 2/ relative to the other catalysts is shifted to higher molecular hydrocarbons which are paraffinic. The shift in selectivity is not accompanied by a suppression of the methanation activity, but results from an increase in the rates of chain growth reactions producing an overall increase in catalyst activity. Studies of on-stream deactivation and of the rates of Ni(CO)/sub 4/ formation gave further evidence of the unusual properties of Ni/TiO/sub 2/. Whereas Ni/Al/sub 2/O/sub 3/ deactivated with time on feed, Ni/TiO/sub 2/ showed little or no loss in activity, indicating a greater resistance to carbon deposition and/or metal sintering. With regard to Ni(CO)/sub 4/ formation, Ni/TiO/sub 2/ exhibited rates of formation at least an order of magnitude less than Ni/SiO/sub 2/ catalysts. The evidence from catalytic and chemical studies and, to a lesser extent, chemisorption and XRDmore » investigations is indicative of a unique metal-support interaction in the Ni/TiO/sub 2/ system. The nature of the interaction which so markedly modifies catalytic and chemical properties of metals is not yet well understood. 6 figures, 5 tables.« less

Authors:
;
Publication Date:
Research Org.:
Exxon Research and Engineering Co., Linden, NJ
OSTI Identifier:
6454988
Alternate Identifier(s):
OSTI ID: 6454988
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 56:2
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALKANES; CHEMICAL REACTION YIELD; ALUMINIUM OXIDES; CATALYTIC EFFECTS; CARBON MONOXIDE; METHANATION; GRAPHITE; NICKEL; NICKEL OXIDES; SILICA; TITANIUM OXIDES; CARBONYLS; CATALYST SUPPORTS; CATALYSTS; CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; CHEMISORPTION; COMPARATIVE EVALUATIONS; DEACTIVATION; EXPERIMENTAL DATA; HIGH TEMPERATURE; HYDROGEN; ISOLATED VALUES; MEDIUM PRESSURE; NICKEL COMPOUNDS; POWDERS; PRESSURE DEPENDENCE; REACTION INTERMEDIATES; REACTIVITY; SPECIFICITY; SYNTHESIS GAS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; ALUMINIUM COMPOUNDS; CARBON; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; COHERENT SCATTERING; CRYOGENIC FLUIDS; DATA; DATA FORMS; DIFFRACTION; ELEMENTS; FLUIDS; GASES; HYDROCARBONS; INFORMATION; KINETICS; MECHANICAL STRUCTURES; METALS; MINERALS; NONMETALS; NUMERICAL DATA; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; SCATTERING; SEPARATION PROCESSES; SILICON COMPOUNDS; SILICON OXIDES; SORPTION; SUPPORTS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; YIELDS 090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989); 400201 -- Chemical & Physicochemical Properties

Citation Formats

Vannice, M.A., and Garten, R.L. Metal-support effects on the activity and selectivity of Ni catalysts in CO/H/sub 2/ synthesis reactions. United States: N. p., 1979. Web.
Vannice, M.A., & Garten, R.L. Metal-support effects on the activity and selectivity of Ni catalysts in CO/H/sub 2/ synthesis reactions. United States.
Vannice, M.A., and Garten, R.L. Thu . "Metal-support effects on the activity and selectivity of Ni catalysts in CO/H/sub 2/ synthesis reactions". United States.
@article{osti_6454988,
title = {Metal-support effects on the activity and selectivity of Ni catalysts in CO/H/sub 2/ synthesis reactions},
author = {Vannice, M.A. and Garten, R.L.},
abstractNote = {Titania-supported nickel catalysts exhibit unusual properties in CO--H/sub 2/ reactions relative to conventional nickel catalysts. The activity of Ni/TiO/sub 2/ is significantly greater than that of Ni powder or Ni on SiO/sub 2/, Al/sub 2/O/sub 3/, or graphite when compared on a per gram of catalyst basis or on the basis of specific activities determined from hydrogen chemisorption. In addition, the selectivity of Ni/TiO/sub 2/ relative to the other catalysts is shifted to higher molecular hydrocarbons which are paraffinic. The shift in selectivity is not accompanied by a suppression of the methanation activity, but results from an increase in the rates of chain growth reactions producing an overall increase in catalyst activity. Studies of on-stream deactivation and of the rates of Ni(CO)/sub 4/ formation gave further evidence of the unusual properties of Ni/TiO/sub 2/. Whereas Ni/Al/sub 2/O/sub 3/ deactivated with time on feed, Ni/TiO/sub 2/ showed little or no loss in activity, indicating a greater resistance to carbon deposition and/or metal sintering. With regard to Ni(CO)/sub 4/ formation, Ni/TiO/sub 2/ exhibited rates of formation at least an order of magnitude less than Ni/SiO/sub 2/ catalysts. The evidence from catalytic and chemical studies and, to a lesser extent, chemisorption and XRD investigations is indicative of a unique metal-support interaction in the Ni/TiO/sub 2/ system. The nature of the interaction which so markedly modifies catalytic and chemical properties of metals is not yet well understood. 6 figures, 5 tables.},
doi = {},
journal = {J. Catal.; (United States)},
number = ,
volume = 56:2,
place = {United States},
year = {1979},
month = {2}
}