Dandapat, Anirban and Jana, Debrina and De, Goutam (2011) Pd nanoparticles supported mesoporous gamma-Al(2)O(3) film as a reusable catalyst for reduction of toxic Cr(VI) to Cr(III) in aqueous solution. Applied Catalysis A: General, 396 (1-2). pp. 34-39. ISSN 0926-860X

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Abstract

Pd nanoparticles (NPs) were generated inside the nanocrystalline mesoporous gamma-Al(2)O(3) films of thickness similar to 2 mu m. The support gamma-Al(2)O(3) films were prepared from boehmite sols derived from Al-alkoxide in presence of CTAB. The BET surface area (171 m(2)g(-1)) and pore size (4.3 nm) of the undoped gamma-Al(2)O(3) films were found to be decreased to 139 m(2)g(-1) and 3.5 nm respectively after incorporation of Pd NPs. The films were characterized by GIXRD, cross-sectional FESEM, and TEM. TEM/GIXRD confirmed the existence of uniformly dispersed Pd NPs inside the gamma-Al(2)O(3) films. The Pd NPs (average size similar to 4.1 nm)-incorporating mesoporous gamma-Al(2)O(3) films were used as catalyst to reduce toxic Cr(VI) compounds to non-toxic Cr(III) in presence of formic acid as reducing agent at different temperatures (30, 40, 50 and 60 degrees C). This catalytic reduction process was monitored by UV-visible spectrometer. The rate constant value for the reduction was estimated to be 0.085 min(-1) at 50 degrees C. The same catalytic film can be used for three consecutive cycles by simple washing with water. The catalytic property started to deteriorate after the third cycle. The original catalytic property can be restored fully after heat-treatment of the used films at 300 degrees C in nitrogen atmosphere. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Pd NPs-incorporating mesoporous γ-Al2O3 films; Sol-gel; Film catalyst; CrVI reduction; Reuse of catalyst
Subjects:	Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Jan 2012 12:04
Last Modified:	30 Mar 2016 05:49
URI:	http://cgcri.csircentral.net/id/eprint/87

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