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Title: Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO{sub 2}

Abstract

Low concentrations of acetaldehyde in air (60 ppm) were oxidized over TiO{sub 2} (Degussa P25) and 0.5% Pt/TiO{sub 2} catalysts from 24 to 200 C by photocatalytic and thermal catalytic reactions. On Pt/TiO{sub 2}, the contribution by photocatalytic oxidation (PCO) is a maximum at 140 C, where conversion is 2.8 times that at 24 C. Titania without Pt deactivates rapidly during PCO at elevated temperature due to a thermal catalytic reaction that takes place in parallel with PCO, but the addition of Pt dramatically slows deactivation. Apparently, Pt supplies spillover oxygen onto the TiO{sub 2}, and the oxygen oxidizes the acetaldehyde decomposition products in a dark reaction. Deactivated TiO{sub 2} without Pt was regenerated by PCO at room temperature. Seven distinct reactions (photocatalytic and thermal catalytic) are identified on Pt/TiO{sub 2}.

Authors:
 [1];  [2]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Chemical Engineering
  2. National Renewable Energy Lab., Golden, CO (United States)
Publication Date:
Sponsoring Org.:
National Renewable Energy Lab., Golden, CO (United States); Colorado Univ., Boulder, CO (United States)
OSTI Identifier:
672465
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 179; Journal Issue: 1; Other Information: PBD: 1 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 14 SOLAR ENERGY; ACETALDEHYDE; PHOTOLYSIS; OXIDATION; PLATINUM; TITANIUM OXIDES; CATALYTIC EFFECTS; AIR POLLUTION CONTROL; DEACTIVATION; REGENERATION; SOLAR RADIATION

Citation Formats

Falconer, J L, and Magrini-Bair, K A. Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO{sub 2}. United States: N. p., 1998. Web. doi:10.1006/jcat.1998.2215.
Falconer, J L, & Magrini-Bair, K A. Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO{sub 2}. United States. doi:10.1006/jcat.1998.2215.
Falconer, J L, and Magrini-Bair, K A. Thu . "Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO{sub 2}". United States. doi:10.1006/jcat.1998.2215.
@article{osti_672465,
title = {Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO{sub 2}},
author = {Falconer, J L and Magrini-Bair, K A},
abstractNote = {Low concentrations of acetaldehyde in air (60 ppm) were oxidized over TiO{sub 2} (Degussa P25) and 0.5% Pt/TiO{sub 2} catalysts from 24 to 200 C by photocatalytic and thermal catalytic reactions. On Pt/TiO{sub 2}, the contribution by photocatalytic oxidation (PCO) is a maximum at 140 C, where conversion is 2.8 times that at 24 C. Titania without Pt deactivates rapidly during PCO at elevated temperature due to a thermal catalytic reaction that takes place in parallel with PCO, but the addition of Pt dramatically slows deactivation. Apparently, Pt supplies spillover oxygen onto the TiO{sub 2}, and the oxygen oxidizes the acetaldehyde decomposition products in a dark reaction. Deactivated TiO{sub 2} without Pt was regenerated by PCO at room temperature. Seven distinct reactions (photocatalytic and thermal catalytic) are identified on Pt/TiO{sub 2}.},
doi = {10.1006/jcat.1998.2215},
journal = {Journal of Catalysis},
number = 1,
volume = 179,
place = {United States},
year = {1998},
month = {10}
}