Ren X, Tan H, Jie Q, Liu J. DFT studies of the CH
4-SCR of NO on Fe-doped ZnAl
2O
4(100) surface under oxygen conditions.
RSC Adv 2020;
11:927-933. [PMID:
35423704 PMCID:
PMC8693394 DOI:
10.1039/d0ra10017j]
[Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 12/16/2020] [Indexed: 11/21/2022] Open
Abstract
The catalytic reduction performance of NO on the surface of Fe-doped ZnAl2O4 (100) was calculated based on DFT. The adsorption of NO and other molecules, the change of reaction energy of CH4 and C2H4 as reducing agents, and the activation energy barrier of CH4 were studied. It was found that the best adsorption energy of NO is −2.166 eV. Compared with Al and Zn sites, doped Fe atoms are better adsorption catalytic sites. At temperatures of 300 K and 600 K, the molecules will move in the direction of the Fe atoms. O2 adsorption will repel NO, reduce its adsorption energy, and cause NO to lose electrons and be oxidized. The reaction enthalpy with CH4 as the reducing agent is −7.02 eV, and with C2H4 is −3.45 eV. Transition state calculations show that O reduces the dissociation barrier of CH4 by about 2 eV. The smaller adsorption energy and negative reaction enthalpy of the product indicate that the iron-doped ZnAl2O4 has a good catalytic NO potential. This also provides a basis for future research on the catalytic mechanism of different hydrocarbons.
The catalytic reduction performance of NO on the surface of Fe-doped ZnAl2O4 (100) was calculated based on DFT.![]()
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