Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO2 and γ-Al2O3 supported Ni and Ni-Ce catalysts

Yimin Zhang; Ruiming Zeng; Yun Zu; Linhua Zhu; Yi Mei; Yongming Luo; Dedong He

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Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO₂ and γ-Al₂O₃ supported Ni and Ni-Ce catalysts

Updated：2026-01-06

- Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO₂ and γ-Al₂O₃ supported Ni and Ni-Ce catalysts
- Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO₂ and γ-Al₂O₃ supported Ni and Ni-Ce catalysts
- 中国化学工程学报（英文版） 2022年48卷第8期页码：76-90
- Affiliations：
  
  1. Faculty of Chemical Engineering, Kunming University of Science and Technology,Kunming,China,650500
  2. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology,Kunming,China,650500
  3. National Engineering Laboratory for Flue Gas Pollutants Control Technology and Equipment, Tsinghua University,Beijing,China,100084
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2022
- Accepted：
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Yimin Zhang, Ruiming Zeng, Yun Zu, 等. Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO₂ and γ-Al₂O₃ supported Ni and Ni-Ce catalysts[J]. 中国化学工程学报（英文版）, 2022,48(8):76-90.

and
Yimin Zhang, Ruiming Zeng, Yun Zu, 等. Low-temperature dry reforming of methane tuned by chemical speciations of active sites on the SiO₂ and γ-Al₂O₃ supported Ni and Ni-Ce catalysts[J]. 中国化学工程学报（英文版）, 2022,48(8):76-90. DOI：

and DOI：

摘要

Abstract

The cognition of active sites in the Ni-based catalysts plays a vital role and remains a huge challenge in improving catalytic performance of low temperature CO

dry reforming of methane (LTDRM). In this work

typical catalysts of SiO

and

-Al

supported Ni and Ni-Ce were designed and prepared. Importantly

the difference in the chemical speciations of active sites on the Ni-based catalysts is revealed by advanced characterizations and further estimates respective catalytic performance for LTDRM. Results show that larger[Ni

]

particles mixed with [Ni-O-Si

]

) species on the Ni/SiO

(R) make CH

excessive decomposition

leading to poor activity and stability. Once the Ce species is doped

however

superior activity (59.0% CH

and 59.8% CO

conversions)

stability and high H

/CO ratio (0.96) at 600?℃ can be achieved on the Ni-Ce/SiO

(R)

in comparison with other catalysts and even reported studies. The improved performance can be ascribed to the formation of integral ([Ni

]

-[Ce

III

-□-Ce

III

]

) species on the Ni-Ce/SiO

(R) catalyst

containing highly dispersed [Ni

]

particles and rich oxygen vacancies

which can synergistically establish a new stable ba

lance between gasification of carbon species and CO

dissociation. With respect to Ni-Ce/

-Al

(R)

the Ni and Ce precursors are easily captured by extra-framework Al

-OH groups and further form stable isolated ([Ni

]

-[Ni-O-Al

]

) and [Ce

III

-O-Al

]

species. In such a case

both of them preferentially accelerate CO

adsorption and dissociation

causing more carbon deposition due to the disproportionation of superfluous CO product. This deep distinguishment of chemical speciations of active sites can guide us to further develop new efficient Ni-based catalysts for LTDRM in the future.

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