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Jiang Y, Huang Y, Guo H, Zhu H, Chen ZX. Comparative simulations of methanol steam reforming on PdZn alloy using kinetic Monte Carlo and mean-field microkinetic model. J Chem Phys 2024; 161:024701. [PMID: 38980094 DOI: 10.1063/5.0206139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 06/19/2024] [Indexed: 07/10/2024] Open
Abstract
Methanol steam reforming (MSR) is an attractive route for producing clean energy hydrogen. PdZn alloys are extensively studied as potential MSR catalysts for their stability and high CO2 selectivity. Here, we investigated the reaction mechanism using density functional calculations, mean-field microkinetic modeling (MF-MKM), and kinetic Monte Carlo (kMC) simulations. To overcome the over-underestimation of CO2 selectivity by log-kMC, an ads-kMC algorithm is proposed in which the adsorption/desorption rate constants were reduced under certain requirements and the diffusion process was treated by redistributing surface species each time an event occured. The simulations show that the dominant pathway to CO2 at low temperatures is CH3OH → CH3O → CH2O → H2COOH → H2COO → HCOO → CO2. The ads-kMC predicted OH coverage is 2-3 times that of MF-MKM, while they produce similar coverage for other species. Analyses indicate that surface OH promotes the dehydrogenation of CH3OH, CH3O, and H2COOH significantly and plays a key role in the MSR process. The dissociation of water/methanol is the most important rate-limiting/rate-inhibiting step. The CO2 selectivity obtained by the two methods is close to each other and consistent with the experimental trend with temperature. Generally, the ads-kMC results agree with the MF-MKM ones, supporting the previous finding that kMC and MF-MKM predict similar results if the diffusion is very fast and adsorbate interactions are neglected. The present study sheds light on the MSR process on PdZn alloys, and the proposed scheme to overcome the stiff problems in kMC simulations is worthy of being extended to other systems.
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Affiliation(s)
- Yongjie Jiang
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Yucheng Huang
- College of Chemistry and Material Science, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu 241000, China
| | - Hui Guo
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hong Zhu
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Zhao-Xu Chen
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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2
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Claudio-Piedras A, Ramírez-Zamora RM, Alcántar-Vázquez BC, Gutiérrez-Martínez A, Mondragón-Galicia G, Morales-Anzures F, Pérez-Hernández R. One dimensional Pt/CeO2-NR catalysts for hydrogen production by steam reforming of methanol: Effect of Pt precursor. Catal Today 2021. [DOI: 10.1016/j.cattod.2019.08.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Brix F, Desbuis V, Piccolo L, Gaudry É. Tuning Adsorption Energies and Reaction Pathways by Alloying: PdZn versus Pd for CO 2 Hydrogenation to Methanol. J Phys Chem Lett 2020; 11:7672-7678. [PMID: 32787294 DOI: 10.1021/acs.jpclett.0c02011] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The tunability offered by alloying different elements is useful to design catalysts with greater activity, selectivity, and stability than single metals. By comparing the Pd(111) and PdZn(111) model catalysts for CO2 hydrogenation to methanol, we show that intermetallic alloying is a possible strategy to control the reaction pathway from the tuning of adsorbate binding energies. In comparison to Pd, the strong electron-donor character of PdZn weakens the adsorption of carbon-bound species and strengthens the binding of oxygen-bound species. As a consequence, the first step of CO2 hydrogenation more likely leads to the formate intermediate on PdZn, while the carboxyl intermediate is preferentially formed on Pd. This results in the opening of a pathway from carbon dioxide to methanol on PdZn similar to that previously proposed on Cu. These findings rationalize the superiority of PdZn over Pd for CO2 conversion into methanol and suggest guidance for designing more efficient catalysts by promoting the proper reaction intermediates.
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Affiliation(s)
- Florian Brix
- Univ. Lorraine, CNRS, Institut Jean Lamour, Campus Artem, 2 Allée André Guinier, F-54011 Nancy, France
| | - Valentin Desbuis
- Univ. Lorraine, CNRS, Institut Jean Lamour, Campus Artem, 2 Allée André Guinier, F-54011 Nancy, France
- École des Mines de Nancy, Campus Artem, CS 14 234, 92 Rue Sergent Blandan, 54042 Nancy, France
| | - Laurent Piccolo
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626 Villeurbanne, France
| | - Émilie Gaudry
- Univ. Lorraine, CNRS, Institut Jean Lamour, Campus Artem, 2 Allée André Guinier, F-54011 Nancy, France
- École des Mines de Nancy, Campus Artem, CS 14 234, 92 Rue Sergent Blandan, 54042 Nancy, France
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4
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Ke C, Lin Z. Catalytic Effect of Hydrogen Bond on Oxhydryl Dehydrogenation in Methanol Steam Reforming on Ni(111). Molecules 2020; 25:molecules25071531. [PMID: 32230888 PMCID: PMC7181061 DOI: 10.3390/molecules25071531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 03/25/2020] [Accepted: 03/25/2020] [Indexed: 11/16/2022] Open
Abstract
Dehydrogenation of H3COH and H2O are key steps of methanol steam reforming on transition metal surfaces. Oxhydryl dehydrogenation reactions of HxCOH (x = 0-3) and OH on Ni (111) were investigated by DFT calculations with the OptB88-vdW functional. The transition states were searched by the climbing image nudged elastic band method and the dimer method. The activation energies for the dehydrogenation of individual HxCOH* are 68 to 91 kJ/mol, and reduced to 12-17 kJ/mol by neighboring OH*. Bader charge analysis showed the catalysis role of OH* can be attributed to the effect of hydrogen bond (H-bond) in maintaining the charge of oxhydryl H in the reaction path. The mechanism of H-bond catalysis was further demonstrated by the study of OH* and N* assisted dehydrogenation of OH*. Due to the universality of H-bond, the H-bond catalysis shown here, is of broad implication for studies of reaction kinetics.
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Affiliation(s)
- Changming Ke
- Hefei National Laboratory for Physical Sciences at Microscales, Department of Physics, School of Physical Sciences, University of Science and Technology of China, Hefei 230052, Anhui, China;
| | - Zijing Lin
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, School of Physical Sciences, University of Science and Technology of China, Hefei 230052, Anhui, China
- Correspondence: ; Tel.: +86-551-63606345; Fax: +86-551-63606348
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5
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Chen M, Han Y, Goh TW, Sun R, Maligal-Ganesh RV, Pei Y, Tsung CK, Evans JW, Huang W. Kinetics, energetics, and size dependence of the transformation from Pt to ordered PtSn intermetallic nanoparticles. NANOSCALE 2019; 11:5336-5345. [PMID: 30843547 DOI: 10.1039/c8nr10067e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The outstanding catalytic activity and chemical selectivity of intermetallic compounds make them excellent candidates for heterogeneous catalysis. However, the kinetics of their formation at the nanoscale is poorly understood or characterized, and precise control of their size, shape and composition during synthesis remains challenging. Here, using well-defined Pt nanoparticles (5 nm and 14 nm) encapsulated in mesoporous silica, we study the transformation kinetics from monometallic Pt to intermetallic PtSn at different temperatures by a series of time-evolution X-ray diffraction studies. Observations indicate an initial transformation stage mediated by Pt surface-controlled intermixing kinetics, followed by a second stage with distinct transformation kinetics corresponding to a Ginstling-Brounstein (G-B) type bulk diffusion mode. Moreover, the activation barrier for both surface intermixing and diffusion stages is obtained through the development of appropriate kinetic models for the analysis of experimental data. Our density-functional-theory (DFT) calculations provide further insights into the atomistic-level processes and associated energetics underlying surface-controlled intermixing.
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Affiliation(s)
- Minda Chen
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
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6
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Fan F, Zhao L, Hou H, Zhang Q. Insights into the CO Formation Mechanism during Steam Reforming of Dimethyl Ether over NiO/Cu-Based Catalyst. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b02628] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Feiyue Fan
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Long Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Hong Hou
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Qi Zhang
- Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China
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Wu P, Yang B. Intermetallic PdIn catalyst for CO2 hydrogenation to methanol: mechanistic studies with a combined DFT and microkinetic modeling method. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01242g] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Reaction pathways of methanol and carbon monoxide formation from CO2 hydrogenation over PdIn(110) and (211) with a combined density functional theory and microkinetic modeling approach.
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Affiliation(s)
- Panpan Wu
- School of Physical Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
- Shanghai Institute of Ceramics, Chinese Academy of Sciences
| | - Bo Yang
- School of Physical Science and Technology
- ShanghaiTech University
- Shanghai 201210
- China
- CAS Key Laboratory of Low-Carbon Conversion Science & Engineering
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Kojima T, Kameoka S, Fujii S, Ueda S, Tsai AP. Catalysis-tunable Heusler alloys in selective hydrogenation of alkynes: A new potential for old materials. SCIENCE ADVANCES 2018; 4:eaat6063. [PMID: 30345356 PMCID: PMC6195335 DOI: 10.1126/sciadv.aat6063] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 09/10/2018] [Indexed: 05/14/2023]
Abstract
Heusler alloys (X 2 YZ) are well-established intermetallic compound materials in various fields because their function can be precisely adjusted by elemental substitution (e.g., X 2 YZ 1-x Z' x ). Although intermetallic compound catalysts started attracting attention recently, catalysis researchers are not familiar with Heusler alloys. We report their potential as novel catalysts focusing on the selective hydrogenation of alkynes. We found that Co2MnGe and Co2FeGe alloys have great alkene selectivity. Mutual substitution of Mn and Fe (Co2Mn x Fe1-x Ge) enhanced the reaction rate without changing selectivity. The substitution of Ga for Ge decreased the selectivity but increased the reaction rate monotonically with Ga composition. Elucidation of these mechanisms revealed that the fine tuning of catalytic properties is possible in Heusler alloys by separately using ligand and ensemble effects of elemental substitution.
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Affiliation(s)
- Takayuki Kojima
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Satoshi Kameoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Shinpei Fujii
- Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
| | - Shigenori Ueda
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
- Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148, Japan
| | - An-Pang Tsai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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9
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Tsai AP, Kameoka S, Nozawa K, Shimoda M, Ishii Y. Intermetallic: A Pseudoelement for Catalysis. Acc Chem Res 2017; 50:2879-2885. [PMID: 29219300 DOI: 10.1021/acs.accounts.7b00476] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A clear correlation between electronic structure and CO2 selectivity for steam reforming of methanol (SRM) was obtained with PdZn, PtZn, NiZn, and PdCd intermetallics on the basis of experiments and calculations. In order to rule out the effects of oxide supports, the intermetallic powders were simply prepared by alloying in an arc furnace followed by crushing in a mortar. PdZn and PdCd exhibit valence electronic densities of states similar to that of Cu and significant chemical shifts (larger than 1 eV) of Pd 3d states with respect to pure Pd, as verified by high-resolution hard X-ray photoelectron spectroscopy (HXPS) measurements and density functional theory (DFT) calculations. Consequently, they show the similar high selectivity of CO2 for the SRM reaction. However, this is not the case for PtZn and NiZn because of the slight differences in their valence electronic structures from that of PdZn. The interval between the Fermi level and the top of the d band is closely related to the selectivity of CO2 for the SRM: the larger the interval is, the higher is the selectivity of CO2. According to DFT calculations for bulk PdZn performed by Chen et al. ( Phys. Rev. B 2003 , 68 , 075417 ), the (111) and (100) surfaces exposing Zn and Pd in an equimolar ratio are more stable than the (001) or (110) surfaces terminated by alternative Zn or Pd layers. First-principles slab calculations for PdZn, PtZn, and NiZn show that bond breaking on the surface leads to a reduction in the d bandwidth but that the d band for stable (111) or (100) surfaces remains essentially unchanged from that of the bulk. It is intriguing that PdZn and PdCd do not contain Cu but show similar valence electronic structure and catalytic selectivity, and hence, a concept is proposed where PdZn and PdCd are regarded as pseudoelements of Cu. The basis of this concept is like electronic structure, like catalysis, which has been demonstrated by experiments and calculations. This is a logical way to enable us to look for new catalysts in which precious metals are partially or completely replaced by base metals. We do not expect that this concept can be applied to all catalytic reactions, but this approach is one of most promising ways to derive a better understanding of the origin of catalytic mechanisms and eventually allow us to design useful catalysts intentionally in the future. This Account reviews the authors' published works on this topic.
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Affiliation(s)
- A. P. Tsai
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
- National Institute for Materials Science, Tsukuba 305-0047, Japan
| | - S. Kameoka
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - K. Nozawa
- Department
of Physics and Astronomy, Kagoshima University, Kagoshima 890-0065, Japan
| | - M. Shimoda
- National Institute for Materials Science, Tsukuba 305-0047, Japan
| | - Y. Ishii
- Department
of Physics, Chuo University, Tokyo 112-8551, Japan
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10
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Furukawa S, Komatsu T. Intermetallic Compounds: Promising Inorganic Materials for Well-Structured and Electronically Modified Reaction Environments for Efficient Catalysis. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02603] [Citation(s) in RCA: 275] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Shinya Furukawa
- Department of Chemistry,
School of Science, Tokyo Institute of Technology 2-12-1-E1-10, Ookayama, Meguro-ku, Tokyo, Japan, 152-8550
| | - Takayuki Komatsu
- Department of Chemistry,
School of Science, Tokyo Institute of Technology 2-12-1-E1-10, Ookayama, Meguro-ku, Tokyo, Japan, 152-8550
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11
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Zhou H, Yang X, Li L, Liu X, Huang Y, Pan X, Wang A, Li J, Zhang T. PdZn Intermetallic Nanostructure with Pd–Zn–Pd Ensembles for Highly Active and Chemoselective Semi-Hydrogenation of Acetylene. ACS Catal 2016. [DOI: 10.1021/acscatal.5b01933] [Citation(s) in RCA: 258] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Huiran Zhou
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaofeng Yang
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Lin Li
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xiaoyan Liu
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yanqiang Huang
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xiaoli Pan
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Aiqin Wang
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jun Li
- Department
of Chemistry, Tsinghua University, Beijing 100084, China
| | - Tao Zhang
- State
Key Laboratory of Catalysis, iChEM (Collaborative Innovation Center
of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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12
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Krajčí M, Hafner J. Intermetallic Compounds as Selective Heterogeneous Catalysts: Insights from DFT. ChemCatChem 2015. [DOI: 10.1002/cctc.201500733] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Marian Krajčí
- Institute of Physics; Slovak Academy of Sciences; Dúbravská cesta 9 84511 Bratislava Slovak Republic
| | - Jürgen Hafner
- Fakultät für Physik and Center for Computational Materials Science; Universität Wien; Sensengasse 8/12 1090 Wien Austria
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