Selective catalytic reduction of NO with ammonia over porous clay heterostructures modified with copper and iron species

• Published in: Catalysis today Vol. 119; no. 1; pp. 181 - 186
• Main Authors: Chmielarz, L., Kuśtrowski, P., Dziembaj, R., Cool, P., Vansant, E.F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.01.2007; Elsevier Science
• Subjects: Ammonia; Catalysis; Chemistry; Colloidal state and disperse state; DeNO x; Exact sciences and technology; General and physical chemistry; NH 3-TPD; PCH-NH 3; Porous materials; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; UV–vis-DRS; Ammonia; NH 3-TPD; UV–vis-DRS; PCH-NH 3; DeNO x; Nitrogen oxide; Clay; Air pollution control; Catalytic reaction; UV-vis-DRS; Transition metal; Iron; Porous material; Chemical reduction; Heterogeneous catalysis; PCH-NH3; NH3-TPD; DeNOx; Copper; Environmental protection
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2006.08.017

Porous clay heterostructures (PCH), obtained on the basis of synthetic saponite, were modified with copper and iron ions by an ion-exchange method and tested as catalysts for the selective reduction of NO with ammonia (NH 3-SCR). Transition metal ions were introduced into H + and NH 4 + forms of PCH. The catalysts were characterized with respect to their texture (BET), composition (EPMA), coordination of transition metals (UV–vis-DRS) and surface acidity (FT-IR, NH 3-TPD). The PCH-based catalysts have been found to be active, selective and stable in the NH 3-SCR process. The Cu-containing catalysts effectively operated at temperatures significantly lower than the Fe-modified samples. The catalyst obtained by exchanging copper ions in the ammonium form of PCH was considerably more active compared to the sample obtained from H +-PCH.