The first measurement of an absolute surface concentration of reaction intermediates in ethylene hydrogenation

Paul S. Cremer; Xingcai Su; Y. Ron Shen; Gabor A. Somorjai

doi:10.1007/BF00815274

The first measurement of an absolute surface concentration of reaction intermediates in ethylene hydrogenation

Paul S. Cremer, Xingcai Su, Y. Ron Shen, Gabor A. Somorjai

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Abstract

The first measurement of a turnover rate with respect to surface intermediate concentration in a high pressure heterogeneous catalytic reaction is reported. By using infrared-visible sum frequency generation to study the hydrogenation of ethylene on Pt(111), it was found that the surface concentration of π-bonded ethylene, the key reaction intermediate, represented approximately 4% of a monolayer. Thus the absolute turnover rate per surface adsorbed ethylene molecule is 25 times faster than the rate measured per platinum atom. To explain these results, we propose a model of weakly adsorbed ethylene intermediates reacting on atop sites.

Original language	English (US)
Pages (from-to)	143-145
Number of pages	3
Journal	Catalysis Letters
Volume	40
Issue number	3-4
DOIs	https://doi.org/10.1007/BF00815274
State	Published - Aug 1996

All Science Journal Classification (ASJC) codes

Catalysis
General Chemistry

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10.1007/BF00815274

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title = "The first measurement of an absolute surface concentration of reaction intermediates in ethylene hydrogenation",

abstract = "The first measurement of a turnover rate with respect to surface intermediate concentration in a high pressure heterogeneous catalytic reaction is reported. By using infrared-visible sum frequency generation to study the hydrogenation of ethylene on Pt(111), it was found that the surface concentration of π-bonded ethylene, the key reaction intermediate, represented approximately 4% of a monolayer. Thus the absolute turnover rate per surface adsorbed ethylene molecule is 25 times faster than the rate measured per platinum atom. To explain these results, we propose a model of weakly adsorbed ethylene intermediates reacting on atop sites.",

author = "Cremer, {Paul S.} and Xingcai Su and {Ron Shen}, Y. and Somorjai, {Gabor A.}",

year = "1996",

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language = "English (US)",

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pages = "143--145",

journal = "Catalysis Letters",

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AU - Cremer, Paul S.

AU - Su, Xingcai

AU - Ron Shen, Y.

AU - Somorjai, Gabor A.

PY - 1996/8

Y1 - 1996/8

N2 - The first measurement of a turnover rate with respect to surface intermediate concentration in a high pressure heterogeneous catalytic reaction is reported. By using infrared-visible sum frequency generation to study the hydrogenation of ethylene on Pt(111), it was found that the surface concentration of π-bonded ethylene, the key reaction intermediate, represented approximately 4% of a monolayer. Thus the absolute turnover rate per surface adsorbed ethylene molecule is 25 times faster than the rate measured per platinum atom. To explain these results, we propose a model of weakly adsorbed ethylene intermediates reacting on atop sites.

AB - The first measurement of a turnover rate with respect to surface intermediate concentration in a high pressure heterogeneous catalytic reaction is reported. By using infrared-visible sum frequency generation to study the hydrogenation of ethylene on Pt(111), it was found that the surface concentration of π-bonded ethylene, the key reaction intermediate, represented approximately 4% of a monolayer. Thus the absolute turnover rate per surface adsorbed ethylene molecule is 25 times faster than the rate measured per platinum atom. To explain these results, we propose a model of weakly adsorbed ethylene intermediates reacting on atop sites.

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JF - Catalysis Letters

IS - 3-4

ER -

The first measurement of an absolute surface concentration of reaction intermediates in ethylene hydrogenation

Abstract

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