Zeolite-encapsulated vanadium oxo species for the selective catalytic reduction of NO by NH3
Conference
·
OSTI ID:214606
- Purdue Univ., West Lafayette, IN (United States)
Vanadium oxo species have been introduced into the supercages of Y-zeolite by adsorption and decomposition of VOCl{sub 3} and VO(O-i-C{sub 3}H{sub 7}){sub 3} to produce catalysts for the study of the effects of oxovanadium site isolation on selective catalytic reduction (SCR) of NO with NH{sub 3} and on partial oxidation reactions. {sup 51}V solid-state magic angle spinning NMR and EXAFS of calcined samples with up to 4 V atoms per supercage show that the host Y-zeolite typically stabilizes the vanadium in distorted tetrahedral coordination. DRIFTS studies show that at 100{degrees}C ammonia adsorbs primarily on Bronsted acid sites. DRIFTS experiments during NO reaction with preadsorbed NH{sub 3} show that some of the Bronsted sites correspond to V-OH at 3690 cm{sup -1}. For the SCR reaction in the 350-450{degrees}C range, the turnover frequencies (TOF), based on NO conversion and total V loading, range from 1 x 10{sup -5} to 2 x 10{sup -4} s{sup -1} with selectivity to N{sub 2} of 100% at 350 and 400 and 70-80% at 450{degrees}C. The dependence of the SCR TOF on vanadium loading and other trends will be discussed.
- OSTI ID:
- 214606
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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