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 language | English |
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Pages (from-to) | 3265-3277 |
Number of pages | 13 |
Journal | Research on Chemical Intermediates |
Volume | 39 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2013 Sept |
Keywords
- Acidity
- NH-SCR
- NO conversion
- Pore size
- TiO
ASJC Scopus subject areas
- Chemistry(all)