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Use of tailored zeolites in abatement of gaseous pollutants
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Dissertation
Use of tailored zeolites in abatement of gaseous pollutants
2003
Overview
A range of porous siliceous materials has been synthesised and ion-exchanged with various metal centres. These materials include several zeolites (A, P, X, Y, synthetic and natural mordenites and natural clinoptilolite) and M41S type solids. Characterisation of these materials was carried out using a variety of techniques including nitrogen sorption studies, power X-ray diffraction, 29Si- and 27Al MAS NMR, FT-IR, thermal analysis, and particle size analysis. The prepared materials were tested for catalytic/destruction activity towards two specific nitrogenous pollutants, hydrogen cyanide and nitrous oxide. Results from hydrogen cyanide testing show that the most active centre tested is copper(II) supposed in a zeolite-P matrix, which reacts with HCN to form cyanogen. Initial studies into the removal of cyanogen using chromium and cobalt showed promising results for the use of cobalt supported within a zeolite-P host as a cyanogen remover. Tests into the removal of nitrous oxide showed promising results, with several materials showing 100% conversion of N2O. Mordenite materials were found to be highly active towards N2O, with the synthetic material only slightly more active than the natural analogue. No other study has investigated the activity of natural materials in this application; this study has shown that a high purity and uniformity of the parent material gives only slight advantages. Although three different transition metal centres (Fe, Co, Cu) were tested for activity in each support, no one metal came out as most active in each support, indicating that the choice of metal is dictated by the support in use and vice versa. The varying activity of samples under differing conditions showed
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
1073237362, 9781073237364
