Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 203, Issue -, Pages 199-209Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.10.010
Keywords
NOx removal; Highly-ordered mesoporous; W-Ce oxides; Low temperature SCR
Funding
- Natural Science Foundation of China [21377061, 81270041]
- Key Technologies R&D Program of Tianjin [15JCYBJC48400, 14ZCZDSF00001, 15JCZDJC41200, 16YFZCSF00300]
- NIH [R21AI107415, SC2GM105584]
- UT STARS Award
- BBRC Pilot
- UTEP
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To eliminate nitrogen oxides (NOx), a series of highly ordered mesoporous WO3(chi)-CeO2 nanomaterials (chi represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NOx with NH3 at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H-2-TPR, NH3-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO3(chi)-CeO2 (chi = 0, 0.5, 0.75,1 and 1.25) showed highly ordered mesoporous channels. Furthermore, mesoporous WO3(1)-CeO2 exhibited the best removal efficiency of NOx, and its NOx conversion ratio could reach 100% from 225 degrees C to 350 degrees C with a gas hourly space velocity of 30 000 h(-1), which was due to higher Ce3+ concentrations, abundant active surface oxygen species and Lewis acid sites based on XPS, H-2-TPR, NH3-TPD and in situ DRIFTS. In addition, several key performance parameters of mesoporous WO3(1)-CeO2, such as superior water resistance, better alkali metal resistance, higher thermal stability and N-2 selectivity, were systematically studied, indicating that the synthesized mesoporous WO3(1)-CeO2 has great potential for industrial applications. (C) 2016 Elsevier B.V. All rights reserved.
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