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Nitrate hydrogenation on Pd–Cu/TiO2 catalyst prepared by photo-deposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
55762 47063 2011 6 PDF Available
Title
Nitrate hydrogenation on Pd–Cu/TiO2 catalyst prepared by photo-deposition
Abstract

Bimetallic Pd–Cu/TiO2 is prepared by successive photo-deposition process and characterized by means of TEM, H2-TPR and FTIR spectra of CO adsorption. The as-prepared Pd–Cu/TiO2 is studied as promising catalyst for nitrate hydrogenation and a step-wise reaction process, divided into nitrate hydrogenation to nitrite and nitrite hydrogenation to nitrogen, is observed. The active sites for nitrate and nitrite hydrogenation over Pd–Cu/TiO2 are discussed individually. It is observed that basic conditions of reaction solution favor the hydrogenation of nitrate to nitrite, while acidic conditions favor the hydrogenation of nitrite to nitrogen. For nitrite hydrogenation, acetic acid is more efficient acidic buffer than hydrochloric acid due to an in situ buffering effect. Based on these results, a two-step process, by changing the reaction solution from basic conditions to acidic conditions at midterm, is developed to realize the hydrogenation of nitrate to nitrogen over bimetallic Pd–Cu/TiO2.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► Bimetallic Pd–Cu/TiO2, with typical structure of Cu@Pd@TiO2, is prepared by successive photo-deposition. ► A step-wise reaction process, including nitrate hydrogenation to nitrite and nitrite hydrogenation to nitrogen, is observed. ► A two-step process, by changing the reaction solution from basic conditions to acid conditions at midterm, is developed for nitrate hydrogenation to nitrogen.

Keywords
Photo-deposition; Nitrate; Hydrogenation; Pd–Cu/TiO2
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Nitrate hydrogenation on Pd–Cu/TiO2 catalyst prepared by photo-deposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 356–361
Authors
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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