Citation: DUAN Yan-kang, SONG Zhong-xian, ZHANG Qiu-lin, LIU Qi-xian, ZHANG Jin-hui, ZHANG Teng-fei, SUN Er-bo. Effect of acid property on selective catalytic reduction of NO with ammonia over photungstic acid modified CeO₂ catalyst[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(10): 1259-1265. shu

Effect of acid property on selective catalytic reduction of NO with ammonia over photungstic acid modified CeO₂ catalyst

1.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
2.
Sinope Group, Luoyang 471000, China

Corresponding author: ZHANG Qiu-lin, qiulinzhang_kmust@163.com
Received Date: 15 April 2016
Revised Date: 10 July 2016

Figures(9)

A series of CeO₂ catalysts was modified with different acids including phosphotungstic acid (P-W), phosphate acid (P), partial ammonium tungstate (W), and phosphate acid plus partial ammonium tungstate (P+W); the effect of acid modification on the performance of CeO₂ catalyst in the selective catalytic reduction of NO with ammonia (NH₃-SCR) was then investigated. The results indicated that the CeO₂ catalyst after acid modification possesses abundant surface acid sites of weak-medium strength and the acid quantity of various catalysts follows the order of P-W/CeO₂ >W/CeO₂ >P+W/CeO₂ >P/CeO₂. Due to the interaction between P and W species, the P-W/CeO₂ catalyst modified with phosphotungstic acid exhibits high amount of weak-medium surface acid sites and active Ce and O species, which may promote the adsorption and activation of NH₃ and then enhance its catalytic activity in the NH₃-SCR of NO; over the P-W/CeO₂ catalyst, the conversion of NO keeps above 90% at 225-450℃.
- acid modification,
- phosphotungstic acid,
- CeO₂,
- selective catalytic reduction with ammonia,
- NO removal
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of acid property on selective catalytic reduction of NO with ammonia over photungstic acid modified CeO2 catalyst

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通讯作者: 陈斌, bchen63@163.com

Effect of acid property on selective catalytic reduction of NO with ammonia over photungstic acid modified CeO₂ catalyst