NDLI: Catalytic reduction of N$_{2}$O by H$_{2}$ over well-characterized Pt surfaces

Content Provider	Springer Nature Link
Author	Yang, Won Ho Kim, Moon Hyeon
Copyright Year	2006
Abstract	A 0.65% Pt/SiO$_{2}$ catalyst has been prepared using an ion exchange technique and extensively characterized prior to being used for continuous catalytic N$_{2}$O reduction by H$_{2}$ at very low temperatures, such as 363 K. The supported Pt with a high dispersion of 92% gave no presence of O atoms remaining on an H-covered Pt$_{ s }$, based on in situ DRIFTS spectra of CO adsorbed on Pt$_{ s }$ after either N$_{2}$O decomposition at 363 K or subsequent exposure to H$_{2}$ for more than 1 h; thus the residual uptake gravimetrically observed even after the hydrogen titration on an O-covered surface is associated with H$_{2}$O produced by introducing H$_{2}$ at 363 K onto the oxidized Pt$_{ s }$. Dissociative N$_{2}$O adsorption at 363 K on Pt$_{ s }$ was not inhibited by the H$_{2}$O$_{(ad)}$ on the silica surface but not on Pt$_{ s }$, as acquired by IR peaks at 3,437 and 1,641 cm$^{−1}$, in very consistent with the same hydrogen coverage, established via H$_{2}$-N$_{2}$O titration on a reduced Pt$_{ s }$, as that revealed upon the titration reaction with a fully wet surface on which all bands and their position in IR spectra for CO are very similar to that obtained after H2 titration on a reduced Pt$_{ s }$. Based on the characterization using chemisorption and in situ DRIFTS and TPD measurements, the complete loss in the rate of N$_{2}$O decomposition at 363 K after a certain on-stream hour, depending significantly on N$_{2}$O concentrations used, is due to self-poisoning by the strong chemisorption of O atoms on Pt$_{ s }$, while the presence of H$_{2}$ as a reductant could readily catalyze continuous N$_{2}$O reduction at 363 K that is a greatly lower temperature than that reported earlier in the literature.
Starting Page	908
Ending Page	918
Page Count	11
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	23
Issue Number	6
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2006-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalytic N$_{2}$O Reduction Supported Pt Chemisorption DRIFTS Global Warming Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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