TY - JOUR
T1 - Vanadia-chromia grafted on titania
T2 - Structural and catalytic properties in the selective catalytic reduction of NO by NH3
AU - Köhler, K.
AU - Engweiler, J.
AU - Baiker, A.
N1 - Funding Information:
Financial support by the Swiss National Science Foundation is kindly acknowledged. K.K. thanks the Fonds der Chemischen Industrie in Germany for financial support.
PY - 2000/11/20
Y1 - 2000/11/20
N2 - Chromia-vanadia on titania catalysts were prepared by sequential and simultaneous chemical reaction (grafting) of alkoxide and amide precursors of the transition metals with hydroxyl groups of the surface of titania. Their structure and redox properties under mild conditions were investigated by temperature programmed reduction by hydrogen (TPR) and spectroscopic methods, including UV-VIS and EPR. The oxidation state of the grafted transition metals depended strongly on pre-treatment conditions. Catalysts derived by grafting both transition metals (CrO(x)-VO(x)/TiO2) as well as corresponding titania-supported single oxide catalysts, VO(x)/TiO2 and CrO(x)/TiO2, were investigated in the selective catalytic reduction of nitric oxide by ammonia. The catalytic properties of CrO(x)-VO(x)/TiO2 could be explained by the superimposed characteristic behaviours (activity, temperature range, selectivity) of the reference systems VO(x)/TiO2 and CrO(x)/TiO2. Neither catalytic nor spectroscopic investigations indicated any interaction between grafted VO(x) and CrO(x). (C) 2000 Elsevier Science B.V.
AB - Chromia-vanadia on titania catalysts were prepared by sequential and simultaneous chemical reaction (grafting) of alkoxide and amide precursors of the transition metals with hydroxyl groups of the surface of titania. Their structure and redox properties under mild conditions were investigated by temperature programmed reduction by hydrogen (TPR) and spectroscopic methods, including UV-VIS and EPR. The oxidation state of the grafted transition metals depended strongly on pre-treatment conditions. Catalysts derived by grafting both transition metals (CrO(x)-VO(x)/TiO2) as well as corresponding titania-supported single oxide catalysts, VO(x)/TiO2 and CrO(x)/TiO2, were investigated in the selective catalytic reduction of nitric oxide by ammonia. The catalytic properties of CrO(x)-VO(x)/TiO2 could be explained by the superimposed characteristic behaviours (activity, temperature range, selectivity) of the reference systems VO(x)/TiO2 and CrO(x)/TiO2. Neither catalytic nor spectroscopic investigations indicated any interaction between grafted VO(x) and CrO(x). (C) 2000 Elsevier Science B.V.
KW - Grafting
KW - Selective catalytic reduction of nitric oxide by ammonia
KW - Vanadia-chromia/titania catalysts
UR - http://www.scopus.com/inward/record.url?scp=68149110530&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:68149110530
SN - 1381-1169
VL - 162
SP - 423
EP - 430
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -