Influence of Pd Precursor and Method of Preparation on Hydrodechlorination Activity of Alumina Supported Palladium Catalysts |
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Authors: | Rajesh Gopinath N Seshu Babu J Vinod Kumar N Lingaiah P S Sai Prasad |
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Affiliation: | (1) Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad, India |
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Abstract: | A series of alumina supported Pd catalysts were prepared by the novel deposition-precipitation method adopting the chloride
precursor (DP-Cl) of Pd and varying the metal content from 0.25 to 1.0 wt%. The catalytic properties of prepared catalysts
were studied by various characterization techniques such as N2 adsorption, CO chemisorption, TPR, XRD, XPS, and TEM techniques. The activity and stability of the catalysts were evaluated
for the gas phase hydrodechlorination (HDC) of chlorobenzene operating at atmospheric pressure. At 1 wt% of Pd the catalyst
showed higher chlorobenzene conversion with good stability when tested for a period of 25 h, whereas the other catalysts exhibited
a loss in activity with time. In order to elucidate the exceptional activity and stability of this catalyst, a few more catalysts
with 1 wt% Pd were prepared by impregnation technique and also using a non-chloride precursor, palladium nitrate. The 1 wt%
DP-Cl catalyst again was found to be the best among the others. The activity and stability of the DP-Cl catalyst was also
found to be superior to two low-dispersed catalysts, each with 10 wt% Pd, prepared by conventional impregnation method using
the chloride and nitrate as the precursors. The characterization results reveal that the high activity and stability of the
DP-Cl catalyst is related to the formation of electron deficient Pd species and its stabilization in the octahedral vacancies
of alumina. |
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Keywords: | Hydrodechlorination Chlorobenzene Pd/Al2O3 catalyst Deposition– precipitation |
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