Active carbon-supported nickel–palladium catalysts for hydrodechlorination of 1,2-dichloroethane and 1,1,2-trichloroethene

I I Kamińska,A Śrębowata

doi:10.1007/s11164-015-1992-7

I I Kamińska, A Śrębowata

Open Access

https://doi.org/10.1007/s11164-015-1992-7

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Abstract

Norit active carbon-supported Ni–Pd catalysts were prepared, by incipient wetness impregnation, from the metal chlorides NiCl2·6H2O and PdCl2. The catalysts were characterized by temperature-programmed reduction, X-ray diffraction, and scanning electron microscopy, and by temperature-programmed hydrogenation (TPH) of the catalysts after use. When the catalysts were used for gas-phase hydrodechlorination (HDC) of 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethene (TCE), very high activity and stability at a relatively low reaction temperature (503 K) were observed. Hydrodechlorination of TCE led to formation of hydrocarbons as the main products. Use of Ni and Ni–Pd catalysts for hydrodechlorination of 1,2-DCA resulted in very high (~100 %) selectivity for ethene. TPH of the catalysts after use for HDC of 1,2-DCA and TCE revealed the presence of carbon and chlorine-containing deposits on the surfaces of the catalysts. Formation of the NiC x fcc phase and the Ni3C hcp carbide phase were detected for the monometallic nickel and Ni95Pd05 catalysts.

Highlights

The continuous development of industry results in large amounts of harmful substances in the atmosphere, water, and soil
The catalysts were characterized by temperature-programmed reduction, X-ray diffraction, and scanning electron microscopy, and by temperature-programmed hydrogenation (TPH) of the catalysts after use
When the catalysts were used for gasphase hydrodechlorination (HDC) of 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethene (TCE), very high activity and stability at a relatively low reaction temperature (503 K) were observed

Summary

Introduction

The continuous development of industry results in large amounts of harmful substances in the atmosphere, water, and soil. Finding effective and inexpensive methods for removal of these compounds is extremely important. An inexpensive metal with very good catalytic properties in the transformation of chlorinated compounds into value added products, can be an attractive alternative for Pd and Pt [7,8,9,10,11,12,13,14,15,16,17,18,19,20]. Application of supports with acidic properties, for example the acidic form of BEA zeolite or c-Al2O3, usually leads to formation of vinyl chloride as the main product of HDC of 1,2-DCA [15, 16]; TCE conversion usually leads to hydrocarbons [20]

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