The complete hydrogenation mechanisms of CO2 are explored on Ni(110) surface catalyst using density functional theory. We have studied the possible hydrogenation mechanism to form product methane from the stable adsorption-co-adsorption intermediates of CO2 and H2 on Ni(110) surface. Our computations clearly elucidate that the mechanism for the formation of methyl, methoxy and methane moieties from carbon dioxide on the nickel catalyst. Moreover, our studies clearly show that the methane formation via hydroxyl carbonyl intermediate requires a lower energy barrier than via carbon monoxide and formate intermediates on the Ni(110) surface.
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http://dx.doi.org/10.1039/c3cp44495c | DOI Listing |
ACS Appl Mater Interfaces
January 2025
Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States.
Understanding the carbon formation on Ni surfaces is critical for the controlled Ni-based nanofabrication and heterogeneous catalysis. Due to the high solubility of carbon in nickel and the complicated migrations of carbon in the near-surface area, achieving a fundamental understanding of the initial carbonation of a Ni surface at an atomic level is experimentally challenging. Herein, the initial formation of surface carbon adsorbates on Ni(111) from the Boudouard reaction (2CO ↔ CO + C) is studied by scanning tunneling microscopy (STM) in combination with density functional theory (DFT) calculations.
View Article and Find Full Text PDFPhys Chem Chem Phys
June 2023
College of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Crystal-plane effects have pivotal roles in the design of catalysts. In this study, a branched Ni (Ni-BN) catalyst was mainly exposed at the Ni(322) surface and was synthesized in the presence of H. A Ni nanoparticle (Ni-NP) catalyst was mainly exposed at Ni(111) and Ni(100) surfaces and was synthesized without H.
View Article and Find Full Text PDFJ Phys Chem Lett
May 2023
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
The structure sensitivity of CO activation in the presence of H has been identified by ambient-pressure X-ray photoelectron spectroscopy (APXPS) on Ni(111) and Ni(110) surfaces under identical reaction conditions. Based on the APXPS results and computer simulations, we propose that, around room temperature, the hydrogen-assisted activation of CO is the major reaction path on Ni(111), while the redox pathway of CO prevails on Ni(110). With increasing temperature, the two activation pathways are activated in parallel.
View Article and Find Full Text PDFJ Mol Model
October 2022
Institute of Resources and Environment, School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China.
Based on the modified embedded atom method (MEAM) potential suggested by Jin et al. (Appl. Phys.
View Article and Find Full Text PDFJ Colloid Interface Sci
June 2022
College of Biological, Chemical Science and Engineering Jiaxing University, Jiaxing, Zhejiang 314001, PR China. Electronic address:
The electrochemical carbon dioxide (CO) reduction reaction (CORR) used for converting higher-value chemicals is a promising solution to mitigate CO emissions. Nickel (Ni)-based catalysts have been identified as a potential candidate for CO activation and conversion. However, in the CORR, the size effect of the Ni-based electrocatalysts has not been well explored.
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