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Wang X, Pan J, Wei H, Li W, Zhao J, Hu Z. H-assisted CO 2 dissociation on Pd nPt (4-n)/In 2O 3 catalysts: a density functional theory study. Phys Chem Chem Phys 2024; 26:23116-23124. [PMID: 39188237 DOI: 10.1039/d4cp02389g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
CO2 hydrogenation into valuable chemical compounds can effectively address the issues of greenhouse gas emissions and energy scarcity. The activation and dissociation processes of CO2 are crucial for its reduction reactions, but the effects of *H adatoms on the C-O cleavage are still confusing. This study investigates the H-assisted CO2 dissociation pathways on the PdnPt(4-n)/In2O3 (n = 0-4) catalysts via DFT calculation. Initially, the adsorption properties of *H2, *COOH, and *HCOO species are calculated. Then, two H-assisted CO2 dissociation channels, i.e., *CO2 + *H → *COOH → *CO + *OH and *CO2 + *H → *HCOO → *CHO + *O, are studied. Results show that Pt and Pd promote the CO2 hydrogenation and C-O bond cleavage reactions, respectively. In comparison to CO2 direct dissociation, the COOH-mediated and HCOO-mediated channels facilitate and impede the C-O bond cleavage, respectively. Overall, the Pd3Pt/In2O3 constituent is suggested for the H-assisted CO2 dissociation reaction. The electronic effects of the PdnPt(4-n) bimetals adjust the stabilities of the intermediates and barriers of the elementary steps, and the interactions between PdnPt(4-n) and In2O3 provide extra sites for the adsorbates and reaction steps. This study reveals the effects of *H on the C-O bond dissociation processes and provides useful insight into designing PdPt/In2O3 catalysts for CO2 hydrogenation reactions.
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Affiliation(s)
- Xiaowen Wang
- State Key Laboratory of Engines, Tianjin University, Tianjin 300071, China.
| | - Jiaying Pan
- State Key Laboratory of Engines, Tianjin University, Tianjin 300071, China.
| | - Haiqiao Wei
- State Key Laboratory of Engines, Tianjin University, Tianjin 300071, China.
- National Industry-Education Platform of Energy Storage, Tianjin University, Tianjin 300072, China
| | - Wenjia Li
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jun Zhao
- National Industry-Education Platform of Energy Storage, Tianjin University, Tianjin 300072, China
- Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, Tianjin 300071, China
| | - Zhen Hu
- State Key Laboratory of Engines, Tianjin University, Tianjin 300071, China.
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Huang W, Wei C, Li Y, Zhang Y, Lin W. The role of Mo species in Ni-Mo catalysts for dry reforming of methane. Phys Chem Chem Phys 2022; 24:21461-21469. [PMID: 36048173 DOI: 10.1039/d2cp02120j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Ni-Mo catalyst has attracted significant attention due to its excellent coke-resistance in dry reforming of methane (DRM) reaction, but its detailed mechanism is still vague. Herein, Mo-doped Ni (Ni-Mox) and MoOx adsorbed Ni surfaces (MoOx@Ni) are employed to explore the DRM reaction mechanism and the effect of coke-resistance. Due to the electron donor effect of Mo, the antibonding states below the Fermi level between Ni and C increase and the adsorption of C decrease, thereby inhibiting the carbonization of Ni. On account of the strong Mo and O interaction, more O atoms gather around Mo, which inhibits the oxidation of Ni and may promote the formation of MoOx species on the Ni-Mo catalyst. The presence of Mo-O species promotes the carbon oxidation, forming a unique redox cycle (MoOx ↔ MoOx-1) similar to the Mars-van Krevelen (MvK) mechanism, explaining the excellent anti-carbon deposition effect on the Ni-Mo catalyst.
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Affiliation(s)
- Weiqiao Huang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China.
| | - Changgeng Wei
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China.
| | - Yi Li
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China. .,Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen, Fujian 361005, China
| | - Yongfan Zhang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China. .,Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen, Fujian 361005, China
| | - Wei Lin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China. .,Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen, Fujian 361005, China
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Shtansky DV, Matveev AT, Permyakova ES, Leybo DV, Konopatsky AS, Sorokin PB. Recent Progress in Fabrication and Application of BN Nanostructures and BN-Based Nanohybrids. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2810. [PMID: 36014675 PMCID: PMC9416166 DOI: 10.3390/nano12162810] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/11/2022] [Accepted: 08/12/2022] [Indexed: 05/27/2023]
Abstract
Due to its unique physical, chemical, and mechanical properties, such as a low specific density, large specific surface area, excellent thermal stability, oxidation resistance, low friction, good dispersion stability, enhanced adsorbing capacity, large interlayer shear force, and wide bandgap, hexagonal boron nitride (h-BN) nanostructures are of great interest in many fields. These include, but are not limited to, (i) heterogeneous catalysts, (ii) promising nanocarriers for targeted drug delivery to tumor cells and nanoparticles containing therapeutic agents to fight bacterial and fungal infections, (iii) reinforcing phases in metal, ceramics, and polymer matrix composites, (iv) additives to liquid lubricants, (v) substrates for surface enhanced Raman spectroscopy, (vi) agents for boron neutron capture therapy, (vii) water purifiers, (viii) gas and biological sensors, and (ix) quantum dots, single photon emitters, and heterostructures for electronic, plasmonic, optical, optoelectronic, semiconductor, and magnetic devices. All of these areas are developing rapidly. Thus, the goal of this review is to analyze the critical mass of knowledge and the current state-of-the-art in the field of BN-based nanomaterial fabrication and application based on their amazing properties.
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Affiliation(s)
- Dmitry V. Shtansky
- Labotoary of Inorganic Nanomaterials, National University of Science and Technology “MISiS”, Leninsky Prospect 4, 119049 Moscow, Russia
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Hu P, Wang S, Zhuo Y. CO 2 adsorption enhancement over Al/C-doped h-BN: A DFT study. CHEMOSPHERE 2022; 292:133396. [PMID: 34968508 DOI: 10.1016/j.chemosphere.2021.133396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
Reducing energy barriers of CO2 being chemisorbed on hexagonal boron nitride (h-BN) is a kernel step to efficiently and massively capture CO2. In this study, aluminum/carbon (Al/C) atoms are used as dopants to alter surface potential fields of h-BN, which aims at lowering energy barriers of adsorption processes. Through theoretical calculations, direct-adsorption structures/properties of CO2, joint-adsorption structures/properties of CO2/H2O, transition state (TS) energy barriers, effects of temperatures on adsorption energies/TS energy barriers and changes of reaction rate constants over different adsorbents are investigated in detail in order to reveal how doping of Al/C atoms promotes CO2 adsorption strength over doped h-BN. According to DFT calculation results, the average adsorption energy of CO2 being directly adsorbed on Al/C-doped h-BN arrives at -59.43 kJ/mol, which is about 5 times as big as that over pure h-BN. As to the average adsorption energy of CO2/H2O and relevant TS energy barrier, they are modified to -118.89 kJ/mol and 40.23 kJ/mol over Al/C-doped h-BN in contrast with -33.91 kJ/mol and 1695.11 kJ/mol over pure h-BN, respectively. What is more, based on thermodynamic analyses and reaction dynamics, the average desorption temperatures of CO2(/H2O) are promoted over doped h-BN and the temperature power exponent is negatively correlated with the activation energy in the Arrhenius equation form. The complete understanding of this study would supply crucial information for applying Al/C-doped h-BN to effectively capturing CO2 in real industries.
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Affiliation(s)
- Pengbo Hu
- Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, PR China; Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, PR China
| | - Shujuan Wang
- Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, PR China; Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, PR China; Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline-Alkaline and Desert Land, Tsinghua University, Beijing, 00084, PR China
| | - Yuqun Zhuo
- Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, PR China; Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, PR China; Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline-Alkaline and Desert Land, Tsinghua University, Beijing, 00084, PR China.
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Bezerra DM, Ferreira GR, Assaf EM. Catalysts applied in biogas reforming: phases behavior study during the H2 reduction and dry reforming by in situ X-ray diffraction. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1007/s43153-021-00213-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Coking-resistant dry reforming of methane over Ni/γ-Al 2O 3 catalysts by rationally steering metal-support interaction. iScience 2021; 24:102747. [PMID: 34278257 PMCID: PMC8261659 DOI: 10.1016/j.isci.2021.102747] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/25/2021] [Accepted: 06/14/2021] [Indexed: 11/22/2022] Open
Abstract
The coking issue is the main challenge for dry reforming of methane (DRM) over Ni-based catalysts. Herein, we excavate the reasons for the enhanced coking resistance of the bounded Ni over the free state Ni in Ni/γ-Al2O3 catalysts for DRM. Rational metal-support interaction of the bounded Ni would facilitate desorption of CO, thus suppressing CO disproportionation and decreasing carbon deposition. The higher activity of the bounded Ni is ascribed to better methane cracking ability, stronger adsorption, and activation of CO2 by forming polydentate carbonate. The better activation of CO2 over the bounded Ni would also contribute to the gasification of formed coke. We gain an insight into the anti-coking mechanism of DRM determined by metal-support interaction in Ni/γ-Al2O3 catalysts through mechanistic studies. It is believed that our findings would enlighten the design of more efficient catalysts for DRM. The anti-coking ability of the bounded Ni is better than the free state Ni The bounded Ni has a stronger ability to activate CO2 to produce active O∗ species High reactivity and stable polydentate carbonate enables efficient reaction Rational metal-support interaction results in good resistance to CO poisoning
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