Citation: SHANG Hong-Yan, HU Wei, WANG Yun, REN Cheng-Jun, NG Mao-Chu, CHEN Yao-Qiang. Effects of H₂O and O₂ on the Reaction of NO Reduction by CH₄ under Stoichiometric Natural Gas Vehicles[J]. Acta Physico-Chimica Sinica, ;2015, 31(4): 750-756. doi: 10.3866/PKU.WHXB201502051 shu

Effects of H₂O and O₂ on the Reaction of NO Reduction by CH₄ under Stoichiometric Natural Gas Vehicles

1.
1 College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
2 Sichuan Zhongzi Exhaust Gas Cleaning Co., Ltd., Chengdu 611731, P. R. China;
3 Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received Date: 2 November 2014
Available Online: 5 February 2015
Fund Project: 国家自然科学基金(21173153) (21173153) 四川省环境保护厅项目(2011HB002) (2011HB002)四川省科技厅科技支撑项目(2012FZ0008)资助 (2012FZ0008)

Composite support CeZrYLa + LaAl was prepared by co-precipitation, and platinum catalyst supported on the composite support was prepared by impregnation. The behavior of the Pt catalyst for the reaction of NO reduction by CH₄ from the exhausts of natural gas vehicles (NGVs) was studied under stoichiometric conditions. Additionally, the effects of 10% (volume fraction, φ) H₂O and stoichiometric O₂ on the reaction in the presence of CO₂ were also investigated. Results show that N₂ and CO₂ were the main products for the different reactions, CO was detected under high temperature, and NO_x was detected under low temperature (in the presence of O₂, the NO_x was NO₂, whereas the NO_x was N₂O when no O₂ was present). In the presence of 10% (φ) H₂O, the conversion of CH₄ noticeably decreased and NO conversion remained unchanged, possibly because the presence of H₂O weakens the reforming reaction of CH₄ with CO₂, but does not affect the activity of NO reduction by CH₄. In the presence of stoichiometric O₂, there was an obvious increase of CH₄ conversion and a decrease of NO conversion. These could be explained by the competition between NO and O₂, where the oxidation of methane by O₂ is the main reaction, limiting the reaction of NO reduction by CH₄. Moreover, in the presence of 10% (φ) H₂O and stoichiometric O₂, CO₂ reforming of CH₄ was negligible. Numerous reactions were detected simultaneously, such as the oxidation of CH₄ by NO, steam reforming of CH₄, and the reduction of NO by CH₄, thus improving the conversions of CH₄ and NO.
- Pt,
- CeZrYLa+LaAl,
- Gas composition,
- Reduction of NO by CH₄,
- Natural gas vehicle exhaust purification
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Effects of H2O and O2 on the Reaction of NO Reduction by CH4 under Stoichiometric Natural Gas Vehicles

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Effects of H₂O and O₂ on the Reaction of NO Reduction by CH₄ under Stoichiometric Natural Gas Vehicles