Production from ilmenite of TiO2-supported catalysts for selective catalytic reduction of NO with NH3

Title
Production from ilmenite of TiO2-supported catalysts for selective catalytic reduction of NO with NH3
Authors
이경주막불아닐송광호하헌필
Keywords
NO conversion; acidity; Pore size; TiO2; NH3-SCR
Issue Date
2013-09
Publisher
Research on chemical intermediates
Citation
VOL 39, NO 7, 3265-3277
Abstract
Economic production of titanium dioxide (yield > 98 %) from ilmenite has been achieved by use of a modified sulfate reduction process. A series of samples were prepared by varying the concentration of titanium dioxide nuclei (0.2, 0.3, and 0.6 %) and further impregnation with antimony and vanadia. The structural and acidic properties of the samples were comprehensively studied by X-ray diffraction (XRD), transmission electron microscopy, BJH pore size distribution, and temperature-programmed desorption of NH3. The XRD results revealed the presence of intense peaks from anatase titanium dioxide. Enhancement of surface area was observed for second-time filtered samples, possibly because of loss of iron from the bulk. As a result, formation of additional micropores was apparent from N2 adsorption and desorption isotherms. Among all the antimony and vanadia-doped samples, the first-time filtered sample with the low concentration of nuclei (0.2 %) had the highest catalytic activity at low temperatures, owing to its larger pore size and abundant acidic species.
URI
http://pubs.kist.re.kr/handle/201004/50141
ISSN
09226168
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KIST Publication > Article
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