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1 Polish Journal of Chemistry

1 2007

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Chlorine Removal from 1,2-Dichloroethane over Ni/C Catalysts

Śrębowata A., Stefanowicz-Pięta I., Juszczyk W., Karpiński Z.

Polish Journal of Chemistry

2007

Vol. 81, nr 8

1521-1529

Active carbon-supported nickel catalysts prepared from nitrate and sulfate nickel salts have been investigated in the hydrodechlorination of 1,2-dichloroethane at 210–230°C. The ex-sulfate catalyst showed practically 100% selectivity towards ethene. In contrast, the ex-nitrate sample, which additionally has been subjected to a high temperature pretreatment exhibited a steadily increasing selectivity towards vinyl chloride (up to 11%), resembling the catalytic behavior of previously investigated Ni/C catalysts characterized by low metal dispersions. The X-ray diffraction study of reduced and used catalysts as well as the temperature programmed hydrogenation of deposited coke from used catalysts showed a different extent of nickel carbiding during hydrodechlorination. The presence of residual sulfur in the ex-sulfate catalyst clearly inhibits carbon incorporation into nickel.