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The roles of ammonia and ammonium bicarbonate in the preparation of nickel particles from nickel chloride

Published online by Cambridge University Press:  31 January 2011

B. Xia ,
I. W. Lenggoro  and
K. Okuyama
B. Xia
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
I. W. Lenggoro
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
K. Okuyama
Affiliation:
Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima, 739–8527, Japan
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Abstract

The roles of NH3 · H2O and NH4HCO3 in the preparation of Ni particles from NiCl2 · 6H2O aqueous solution by ultrasonic spray pyrolysis were investigated. The results showed that both ammonia and ammonium bicarbonate had a remarkable influence on the solution chemistry and the resulting particles, and could significantly modify the reaction pathway. After the addition of these additives to the precursor solution, intermediate NiO was formed initially, followed by reduction to metallic Ni in the presence of a reductive gas. H2 is a powerful reducing agent; however, metallic Ni could also be obtained in the absence of H2 in the carrier gas. In the latter case, it was shown that NH3 was primarily responsible for Ni formation. A description of the mechanisms and processes of Ni formation during spray pyrolysis is proposed.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2157 - 2166
Copyright
Copyright © Materials Research Society 2000

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