Effect of vanadium on the behaviour of unsulfated and sulfated Ti-pillared clay catalysts in the SCR of NO by NH3 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Catalysis Today Année : 2009

Effect of vanadium on the behaviour of unsulfated and sulfated Ti-pillared clay catalysts in the SCR of NO by NH3

Résumé

Vanadium supported on unsulfated and sulfated Ti-pillared clays are developed for the selective catalytic reduction (SCR) of nitrogen oxide (NO) by ammonia. The unsulfated Ti-pillared clays (TiM-PILC) were prepared by hydrolysis of titanium methoxide (Ti(OCH3)4) with HCl. The same procedure was employed using H2SO4 in order to obtain the sulfated Ti-pillared clays (STiM-PILC). All the pillared materials were characterized before and after vanadium addition by chemical analysis, XRD, N2-physisorption, TGA, NH3-TPD, H2-TPR and UV–vis. It was found that the sulfation or the addition of a low amount of vanadium into the TiM-PILC reduces the surface area but improves the acidity of the material. The addition of vanadium to the STiM-PILC decreases the surface area, the number of acid sites and the stability of the sulfate species but enhances the redox properties of the material. The STiM-PILC and the V-TiM-PILC exhibit higher NO removal activity at high temperature than the TiM-PILC. The presence of both sulfate and a low amount of vanadium (2 wt.%) in the TiM PILC leads to an excellent active and selective catalyst for SCR-NO with NH3

Domaines

Catalyse

Dates et versions

hal-00375782 , version 1 (16-04-2009)

Identifiants

Citer

Jihene Arfaoui, Lilia Khalfallah Boudali, Abdelhamid Ghorbel, Gerard Delahay. Effect of vanadium on the behaviour of unsulfated and sulfated Ti-pillared clay catalysts in the SCR of NO by NH3. Catalysis Today, 2009, 142, pp.234-238. ⟨10.1016/j.cattod.2008.07.032⟩. ⟨hal-00375782⟩
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