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

Kyung Ju Lee, Muhammad Salman Maqbool, Pullur Anil Kumar, Kwang Ho Song, Heon Phil Ha

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7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3265-3277
Number of pages13
JournalResearch on Chemical Intermediates
Volume39
Issue number7
DOIs
Publication statusPublished - 2013 Sep 1

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Keywords

  • Acidity
  • NH-SCR
  • NO conversion
  • Pore size
  • TiO

ASJC Scopus subject areas

  • Chemistry(all)

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