Morphologic effect of CeO<sub>2</sub> on the catalytic performance of Ni/CeO<sub>2</sub> in CO methanation

YAN Ning; ZHOU An-ning; ZHANG Ya-gang; YANG Zhi-yuan; HE Xin-fu; ZHANG Ya-ting

Volume 48 Issue 4

Apr. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(4): 466-475

YAN Ning, ZHOU An-ning, ZHANG Ya-gang, YANG Zhi-yuan, HE Xin-fu, ZHANG Ya-ting. Morphologic effect of CeO2 on the catalytic performance of Ni/CeO2 in CO methanation[J]. Journal of Fuel Chemistry and Technology, 2020, 48(4): 466-475.

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YAN Ning, ZHOU An-ning, ZHANG Ya-gang, YANG Zhi-yuan, HE Xin-fu, ZHANG Ya-ting. Morphologic effect of CeO₂ on the catalytic performance of Ni/CeO₂ in CO methanation[J]. Journal of Fuel Chemistry and Technology, 2020, 48(4): 466-475.

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Morphologic effect of CeO₂ on the catalytic performance of Ni/CeO₂ in CO methanation

YAN Ning¹,
ZHOU An-ning^{1, 2
,
,},
ZHANG Ya-gang^{1, 2},
YANG Zhi-yuan^{1, 2},
HE Xin-fu^{1, 2},
ZHANG Ya-ting^{1, 2}

1.
College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
2.
Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Xi'an 710021, China

Funds:

the Shaanxi Key Industry Innovation Chain Industrial Field Project 2017ZDCXL-GY-10-01-02

More Information

Corresponding author: ZHOU An-ning, Tel: 0298-5583549, E-mail: psu564@139.com
Received Date: 2019-12-30
Rev Recd Date: 2020-03-26

Available Online: 2021-01-23

Publish Date: 2020-04-10

Abstract

Abstract

CeO₂ supports with different morphologies (including spherical CeO₂-S, bud-shaped CeO₂-F, and polyhedral CeO₂-P) were synthesized and the supported Ni/CeO₂ catalysts were prepared by ammonia-water coordination impregnation method; the effect of CeO₂ morphology on the catalytic performance of Ni/CeO₂ in CO methanation was then investigated. The results indicate that CeO₂-S, CeO₂-F, and CeO₂-P supports are rather different in the exposed crystal planes and oxygen vacancies, which have a significant effect on the catalytic performance of Ni/CeO₂ in CO methanation. In particular, CeO₂-S has the most oxygen vacancies; for CO methanation over the Ni/CeO₂-S catalyst, the conversion of CO and selectivity to CH₄ at 350 ℃ reach 99.19% and 88.88%, respectively. After 10 h thermal stability test, the Ni/CeO₂-S catalyst displays lowest carbon deposit (2.5%); the selectivity to CH₄ over the Ni/CeO₂-S catalyst remains above 80%, which is 1.3 times of that over Ni/CeO₂-F and 17.6 times of that over Ni/CeO₂-P. The excellent catalytic performance of Ni/CeO₂-S may be ascribed to that CeO₂-S support has large surface area and mainly exposes the [111] crystal plane with a large amount of oxygen vacancies, which can enhance the interaction between the support and the active center and alleviate the carbon deposition.
- CO methanation,
- Ni/CeO₂,
- support structure,
- morphology,
- preparation method

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References(30)

References

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