MICROKINETIC ANALYSIS OF DIVERSE EXPERIMENTAL-DATA FOR ETHYLENE HYDROGENATION ON PLATINUM

被引：111

作者：

REKOSKE, JE ^{[1
]}

CORTRIGHT, RD ^{[1
]}

GODDARD, SA ^{[1
]}

SHARMA, SB ^{[1
]}

DUMESIC, JA ^{[1
]}

机构：

[1] UNIV WISCONSIN,DEPT CHEM ENGN,MADISON,WI 53706

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 04期

关键词：

D O I：

10.1021/j100183a067

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Kinetic analysis employing a mechanism that captures the essential surface chemistry of the reaction allows quantitative interpretation of diverse experimental data. This approach is used with a Horiuti-Polanyi mechanism, modified by hydrogen activation steps, to describe the surface chemistry for ethylene hydrogenation over platinum catalysts. In this investigation, kinetic analysis provides a quantitative means of comparing, contrasting, and consolidating results from steady-state kinetic studies, deuterium tracing measurements, vibrational spectroscopy, and temperature programmed desorption. A noncompetitive pathway is dominant at low temperatures, involving sites for hydrogen adsorption that are not blocked by carbonaceous species. At higher temperatures and lower ethylene pressures, more surface sites become available for hydrogen adsorption, and the reaction shifts to a pathway involving competitive hydrogen and ethylene adsorption.

引用

页码：1880 / 1888

页数：9

共 52 条

[21]

HORIUTI J, 1968, NBSNSRDS13

[22]

KAZANSKII VB, 1960, KINET CATAL+, V1, P517

[23] LEED ANALYSIS OF ACETYLENE AND ETHYLENE CHEMISORPTION ON THE PT(111) SURFACE - EVIDENCE FOR ETHYLIDYNE FORMATION [J].