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Nitrate hydrogenation over Pt,In/Al2O3 and Pt,In/SiO2. Effect of aqueous media and catalyst surface properties upon the catalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
52094 46865 2008 6 PDF Available
Title
Nitrate hydrogenation over Pt,In/Al2O3 and Pt,In/SiO2. Effect of aqueous media and catalyst surface properties upon the catalytic activity
Abstract

In this work, bimetallic Pt,In catalysts supported on alumina and silica were studied for the reduction of nitrate to N2 in water, using H2 as reducing agent. Kinetic and characterization results suggest that the active sites are bimetallic particles with the surface enriched in Indium, probably Pt2In3 and/or Pt3In7 species. Of all the catalysts studied in this work, Pt(1 wt.%)In(0.25 wt.%)/Al2O3 is the most active one. At low time-on-stream it has a very high conversion rate, but it decreases with time due to the segregation of Pt and Indium oxide phases under reacting conditions in the aqueous media. The remarkable high activity of this catalyst during the initial stage of the reaction makes this system very interesting for further studies on the reaction mechanism including the possibility of regenerating the active sites.

Keywords
Nitrates; Nitrites; Catalytic reduction
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Nitrate hydrogenation over Pt,In/Al2O3 and Pt,In/SiO2. Effect of aqueous media and catalyst surface properties upon the catalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 6, 31 March 2008, Pages 1021–1026
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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