Effect of acid property on selective catalytic reduction of NO with ammonia over photungstic acid modified CeO<sub>2</sub> catalyst

DUAN Yan-kang; SONG Zhong-xian; ZHANG Qiu-lin; LIU Qi-xian; ZHANG Jin-hui; ZHANG Teng-fei; SUN Er-bo

Volume 44 Issue 10

Oct. 2016

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Article Navigation > Journal of Fuel Chemistry and Technology > 2016 > 44(10): 1259-1265

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.

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.

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.

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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

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Corresponding author: Tel: 13668788376, E-mail: qiulinzhang_kmust@163.com
Received Date: 2016-04-15
Rev Recd Date: 2016-07-10

Available Online: 2021-01-23

Publish Date: 2016-10-10

Abstract

Abstract

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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References(28)

References

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