fulltext.study @t Gmail

Pd nanoparticles supported mesoporous γ-Al2O3 film as a reusable catalyst for reduction of toxic CrVI to CrIII in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
41677 45896 2011 6 PDF Available
Title
Pd nanoparticles supported mesoporous γ-Al2O3 film as a reusable catalyst for reduction of toxic CrVI to CrIII in aqueous solution
Abstract

Pd nanoparticles (NPs) were generated inside the nanocrystalline mesoporous γ-Al2O3 films of thickness ∼2 μm. The support γ-Al2O3 films were prepared from boehmite sols derived from Al-alkoxide in presence of CTAB. The BET surface area (171 m2g−1) and pore size (4.3 nm) of the undoped γ-Al2O3 films were found to be decreased to 139 m2g−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 γ-Al2O3 films. The Pd NPs (average size ∼4.1 nm)-incorporating mesoporous γ-Al2O3 films were used as catalyst to reduce toxic CrVI compounds to non-toxic CrIII in presence of formic acid as reducing agent at different temperatures (30, 40, 50 and 60 °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 °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 °C in nitrogen atmosphere.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (184 K)Download as PowerPoint slideResearch highlights► Mesoporous γ-Al2O3 films using CTAB were synthesized. ► Pd NPs were incorporated within the mesopores of the γ-Al2O3 films. ► Toxic CrVI was reduced to CrIII by Pd−γ-Al2O3 film catalyst. ► The film catalyst can be reused several times.

Keywords
Pd NPs-incorporating mesoporous γ-Al2O3 films; Sol-gel; Film catalyst; CrVI reduction; Reuse of catalyst
First Page Preview
Pd nanoparticles supported mesoporous γ-Al2O3 film as a reusable catalyst for reduction of toxic CrVI to CrIII in aqueous solution
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 396, Issues 1–2, 15 April 2011, Pages 34–39
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us