In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support

J. C. Yang, Yong-Gun Shul, C. Louis, M. Che

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Ni/SiO2 catalysts were prepared by wetness impregnation method (INi) and by a new two-step method (ENien2.5/600+ INi2.5). The two-step method consists of formation of chemical glue, "nickel nuclei", having strong metal support interaction with SiO2 and preparation of the "nickel reservoir" which has weak interaction with support. The nucleation and growth behaviors of such Ni/SiO2 catalysts in the preparation stage were continuously monitored by in situ EXAFS spectroscopy. The in situ EXAFS spectra of INi catalyst began to change after 320°C and bulk NiO like structure was formed at 500°C heat treatment. The Ni/SiO2 prepared with the two-step method had larger coordination number of Ni with silica support in the initial stage of in situ monitoring than that of INi catalyst, which showed the coexistence of Ni nuclei and Ni reservoir. The ENien2.5/600+INi2.5 had smaller particles of Ni compared with INi after high temperature calcination. The formation of small Ni particles could be attributed to the strong ion-support interaction of nickel nuclei with nickel reservoir in ENien2.5/600+ INi2.5 catalyst. Slight particle growth occurred after 370°C calcination in Ni/SiO2 prepared by two-step method.

Original languageEnglish
Pages (from-to)315-325
Number of pages11
JournalCatalysis Today
Volume44
Issue number1-4
DOIs
Publication statusPublished - 1998 Sep 30

Fingerprint

Crystallization
Catalyst supports
Crystal growth
Nickel
Nucleation
Impregnation
Catalysts
Calcination
Extended X ray absorption fine structure spectroscopy
Glues
Silicon Dioxide
Metals
Heat treatment
Silica
Ions
Monitoring
Temperature

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Yang, J. C. ; Shul, Yong-Gun ; Louis, C. ; Che, M. / In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support. In: Catalysis Today. 1998 ; Vol. 44, No. 1-4. pp. 315-325.
@article{1fd6927341544ffeaf34e12d25864bb5,
title = "In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support",
abstract = "Ni/SiO2 catalysts were prepared by wetness impregnation method (INi) and by a new two-step method (ENien2.5/600+ INi2.5). The two-step method consists of formation of chemical glue, {"}nickel nuclei{"}, having strong metal support interaction with SiO2 and preparation of the {"}nickel reservoir{"} which has weak interaction with support. The nucleation and growth behaviors of such Ni/SiO2 catalysts in the preparation stage were continuously monitored by in situ EXAFS spectroscopy. The in situ EXAFS spectra of INi catalyst began to change after 320°C and bulk NiO like structure was formed at 500°C heat treatment. The Ni/SiO2 prepared with the two-step method had larger coordination number of Ni with silica support in the initial stage of in situ monitoring than that of INi catalyst, which showed the coexistence of Ni nuclei and Ni reservoir. The ENien2.5/600+INi2.5 had smaller particles of Ni compared with INi after high temperature calcination. The formation of small Ni particles could be attributed to the strong ion-support interaction of nickel nuclei with nickel reservoir in ENien2.5/600+ INi2.5 catalyst. Slight particle growth occurred after 370°C calcination in Ni/SiO2 prepared by two-step method.",
author = "Yang, {J. C.} and Yong-Gun Shul and C. Louis and M. Che",
year = "1998",
month = "9",
day = "30",
doi = "10.1016/S0920-5861(98)00205-3",
language = "English",
volume = "44",
pages = "315--325",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",
number = "1-4",

}

In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support. / Yang, J. C.; Shul, Yong-Gun; Louis, C.; Che, M.

In: Catalysis Today, Vol. 44, No. 1-4, 30.09.1998, p. 315-325.

Research output: Contribution to journalArticle

TY - JOUR

T1 - In situ EXAFS study of the nucleation and crystal growth of Ni particles on SiO2 support

AU - Yang, J. C.

AU - Shul, Yong-Gun

AU - Louis, C.

AU - Che, M.

PY - 1998/9/30

Y1 - 1998/9/30

N2 - Ni/SiO2 catalysts were prepared by wetness impregnation method (INi) and by a new two-step method (ENien2.5/600+ INi2.5). The two-step method consists of formation of chemical glue, "nickel nuclei", having strong metal support interaction with SiO2 and preparation of the "nickel reservoir" which has weak interaction with support. The nucleation and growth behaviors of such Ni/SiO2 catalysts in the preparation stage were continuously monitored by in situ EXAFS spectroscopy. The in situ EXAFS spectra of INi catalyst began to change after 320°C and bulk NiO like structure was formed at 500°C heat treatment. The Ni/SiO2 prepared with the two-step method had larger coordination number of Ni with silica support in the initial stage of in situ monitoring than that of INi catalyst, which showed the coexistence of Ni nuclei and Ni reservoir. The ENien2.5/600+INi2.5 had smaller particles of Ni compared with INi after high temperature calcination. The formation of small Ni particles could be attributed to the strong ion-support interaction of nickel nuclei with nickel reservoir in ENien2.5/600+ INi2.5 catalyst. Slight particle growth occurred after 370°C calcination in Ni/SiO2 prepared by two-step method.

AB - Ni/SiO2 catalysts were prepared by wetness impregnation method (INi) and by a new two-step method (ENien2.5/600+ INi2.5). The two-step method consists of formation of chemical glue, "nickel nuclei", having strong metal support interaction with SiO2 and preparation of the "nickel reservoir" which has weak interaction with support. The nucleation and growth behaviors of such Ni/SiO2 catalysts in the preparation stage were continuously monitored by in situ EXAFS spectroscopy. The in situ EXAFS spectra of INi catalyst began to change after 320°C and bulk NiO like structure was formed at 500°C heat treatment. The Ni/SiO2 prepared with the two-step method had larger coordination number of Ni with silica support in the initial stage of in situ monitoring than that of INi catalyst, which showed the coexistence of Ni nuclei and Ni reservoir. The ENien2.5/600+INi2.5 had smaller particles of Ni compared with INi after high temperature calcination. The formation of small Ni particles could be attributed to the strong ion-support interaction of nickel nuclei with nickel reservoir in ENien2.5/600+ INi2.5 catalyst. Slight particle growth occurred after 370°C calcination in Ni/SiO2 prepared by two-step method.

UR - http://www.scopus.com/inward/record.url?scp=0000795388&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000795388&partnerID=8YFLogxK

U2 - 10.1016/S0920-5861(98)00205-3

DO - 10.1016/S0920-5861(98)00205-3

M3 - Article

AN - SCOPUS:0000795388

VL - 44

SP - 315

EP - 325

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

IS - 1-4

ER -