Soot oxidation and NO{sub x} reduction over BaAl{sub 2}O{sub 4} catalyst
- Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiaotong University, Shanghai 200240 (China)
This study addresses soot oxidation and NO{sub x} reduction over a BaAl{sub 2}O{sub 4} catalyst. By XRD analysis, the catalyst was shown to be of spinel structure. Temperature Programmed Oxidation (TPO) and Constant Temperature Oxidation (CTO) at 673 K show that the presence of O{sub 2} decreases the ignition temperature of soot, and it enhances the conversion of NO{sub x} to N{sub 2} and N{sub 2}O. The kinetic features of soot oxidation in the TPO test are similar to that in the TG-DTA analysis. Analysis by Diffuse Reflectance Fourier Infrared Transform Spectroscopy (DRIFTS) indicates that the nitrates formed from NO{sub x} adsorption and the C(O) intermediates from soot oxidation are the key precursors of the redox process between soot and NO{sub x} over surfaces of the BaAl{sub 2}O{sub 4} catalyst. Moreover, DRIFTS tests suggest that nitrates act as the principal oxidants for C(O) oxidation, through which nitrates are reduced to N{sub 2} and N{sub 2}O. The O{sub 2} in the gas mixture presents a positive effect on the conversion of NO{sub x} to N{sub 2} and N{sub 2}O by promoting the oxidation of nitrites into nitrates species. (author)
- OSTI ID:
- 21235974
- Journal Information:
- Combustion and Flame, Vol. 156, Issue 11; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
33 ADVANCED PROPULSION SYSTEMS
01 COAL, LIGNITE, AND PEAT
NITROUS OXIDE
ALUMINATES
OXIDATION
SOOT
NITRATES
REDUCTION
CATALYSTS
ADSORPTION
NITRITES
REDOX PROCESS
TEMPERATURE RANGE 0400-1000 K
SPINELS
MIXTURES
IGNITION
PRECURSOR
BARIUM OXIDES
ALUMINIUM OXIDES
NITROGEN OXIDES