ARSENIC POISONING OF NICKEL-CATALYSTS FOR THE ADSORPTION OF ETHENE

Authors
NG CF YE H SHE L CHEN H LAI SY
Citation
Cf. Ng et al., ARSENIC POISONING OF NICKEL-CATALYSTS FOR THE ADSORPTION OF ETHENE, Applied catalysis. A, General, 171(2), 1998, pp. 293-299
Citations number
13
Categorie Soggetti
Chemistry Physical","Environmental Sciences
Journal title
Applied catalysis. A, General → ACNP
ISSN journal
0926860X
Volume
171
Issue
2
Year of publication
1998
Pages
293 - 299
Database
ISI
SICI code
0926-860X(1998)171:2<293:APONFT>2.0.ZU;2-I
Abstract
The effect of arsenic poisoning of nickel catalysts for ethene adsorpt ion was studied by the magnetic method and by infrared spectroscopy. E thene adsorbed dissociatively on clean nickel. Arsine preadsorbed on t he surface of nickel inhibited ethene dissociation and so reduced the ethene bond number at low coverage from 8 for clean nickel to 1.3 for nickel preadsorbed with arsine to the amount of 0.55 mmol/g nickel. He ating the arsine-covered nickel to 672-773 K led to segregation of ars enic into the bulk of the nickel, lessening its inhibiting effect for ethene dissociation. Infrared spectroscopy for ethene adsorbed on nick el-arsenic bimetallic catalysts showed that dissociation and self-hydr ogenation of adsorbed ethene on nickel was inhibited by arsenic. For t he bimetallic catalyst with As:Ni mole ratio of 0.16:1, only pi-bonded ethene was observed by infrared spectroscopy. (C) 1998 Elsevier Scien ce B.V. All rights reserved.