Citation: HUANG Jin-jin, CAI Liang-feng, LIU Xi, YANG Jian-ping, QU Wen-qi, LI Hai-long. Mechanism for the enhancement of the resistance of the OMS-2 mercury oxidation catalyst to sulfur by modifying with cerium[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(12): 1433-1441. shu

Mechanism for the enhancement of the resistance of the OMS-2 mercury oxidation catalyst to sulfur by modifying with cerium

School of Energy Science and Engineering, Central South University, Changsha 410083, China

Corresponding author: LI Hai-long, hailong_li@126.com
Received Date: 11 September 2020
Revised Date: 26 October 2020

Fund Project: the National Natural Science Foundation of China 51906260The project was supported by the National Natural Science Foundation of China (51776227, 51906260)the National Natural Science Foundation of China 51776227

Figures(9)

In view of the poor resistance of manganese oxide octahedral molecular sieve (OMS-2) catalyst to sulfur in the oxidation of elemental mercury, CeO₂ was used to modify the OMS-2 catalyst. The mechanism for the enhancement of the resistance of the OMS-2 catalyst to sulfur by modifying with CeO₂ was investigated, with the help of thermodynamic analysis, fixed-bed reaction test and various characterization methods like nitrogen sorption, XRD ICP and XPS. The results indicate: The OMS-2 catalyst modified by Ce has a large surface area and void-rich structure, which can adsorb more Hg⁰ through chemical adsorption; More Mn defects are formed on the OMS-2 catalyst through modifying with Ce, leading to an increase in the electron mobility, the proportion of adsorbed oxygen (O_β) species, and the density of catalytically active sites; The Ce-modified OMS-2 catalyst can quickly re-oxidize the reduced Hg⁰ or HgSO₄ species (facilely formed on the pristine OMS-2 catalyst surface in the presence of SO₂) to HgO, which can then improve the apparent Hg⁰ oxidation efficiency. The results should be helpful for the development of high-performance anti-thio catalysts for mercury oxidation.
- mercury oxide,
- SO₂,
- reduction,
- thermodynamics,
- coal-fired flue gas
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