Citation: CHENG Lin, WANG Rui. Ce-Ti Mixed Oxides Supported H₃PW₁₂O₄₀ for Effective Adsorption-Decomposition of NO_x[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(6): 1206-1214. doi: 10.3969/j.issn.1001-4861.2013.00.195 shu

Ce-Ti Mixed Oxides Supported H₃PW₁₂O₄₀ for Effective Adsorption-Decomposition of NO_x

CHENG Lin ,
WANG Rui

1.
School of Environmental Science & Engineering, Shandong University, Jinan 250100, China

Received Date: 11 October 2012
Available Online: 12 March 2013
Fund Project: 国家自然科学基金(No.20576064,20776080,20911120088) 、教育部“新世纪优秀人才”支持计划(No.NECT-05-0584) (No.20576064,20776080,20911120088) 、教育部“新世纪优秀人才”支持计划(No.NECT-05-0584)教育部博士点基金 (No.20070422087) (No.20070422087)山东省科技计划(No.2006BS08020,2008GG10006005)资助项目。 (No.2006BS08020,2008GG10006005)

Ce-Ti mixed oxides (CeO₂-TiO₂) were prepared as the support for solid tungstophosphoric acid (H₃PW₁₂O₄₀). FTIR, XRD, BET surface area measurement, SEM and TPD-MS were employed for characterization and mechanism analysis. CeO₂-TiO₂ is an excellent support for H₃PW₁₂O₄₀. By loading on CeO₂-TiO₂, the NO_x adsorption efficiency of H₃PW₁₂O₄₀ increases, with a peak efficiency of 90%, which is much higher than that of H₃PW₁₂O₄₀ (60%). With the increase of H₃PW₁₂O₄₀ loading, the NO_x adsorption efficiency tends to reach a peak value before dropping down. The mechanical grinding method is superior to the incipient impregnation method for preparing H₃PW₁₂O₄₀/CeO₂-TiO₂. In NO_x adsorption process, NO_x reacts with H₃PW₁₂O₄₀ to produce NOH⁺. The crystal water in the secondary structure of H₃PW₁₂O₄₀ plays an important role in NO_x adsorption. The lost crystal water and oxygen vacancy can be effectively compensated by adding water vapor to regenerate the catalyst. Furthermore, the adsorbed NO_x is decomposed into N₂, O₂ and N₂O, and rapid heating contributes significantly to the decomposition of NO_x over the catalyst, where a yield of 30.5% is achieved for N₂ with the supported catalyst at a temperature ramp of 50 ℃·min^-1.
- Ce-Ti mixed oxides;H₃PW₁₂O₄₀;NO_x;adsorption-decomposition
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Ce-Ti Mixed Oxides Supported H₃PW₁₂O₄₀ for Effective Adsorption-Decomposition of NO_x