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He K, Zheng J, Jiao J, Yang Y, Li Q, Qin Y, Song L. First-Principles Calculations of the Effect of γ-Alumina Surface Hydroxyl Structures on the Location and Dechlorination of a Platinum Precursor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39153002 DOI: 10.1021/acs.langmuir.4c01306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/19/2024]
Abstract
The interaction between Pt precursors and alumina support is an important step in synthesizing Pt/Al2O3 catalysts, while an in-depth understanding of the interaction is still lacking. Herein, density functional theory (DFT) calculations were performed to simulate the coordination of H2PtCl6 with different surface hydroxyl groups, revealing the influence of the γ-Al2O3 surface hydroxyl structure on the position of the Pt precursor and the removal of Cl ligands. After drying, the interaction mechanism between [PtCl6]2- and alumina support involves hydrogen bonds and van der Waals forces, which are the main driving forces for the structural transformation from [PtCl6]2- coordinated with the surface hydroxyl group into the PtClx(OH)y species (OH is the γ-Al2O3 surface group). HO-μ1-AlVI and H2O-μ1-AlVI on the (100) surface with electrophilicity facilitate hauling and activating the electron-rich [PtCl6]2-, but the nucleophilic (110) surface has a weaker interaction with [PtCl6]2-. Combining free energy and electronic property analysis, the stable structures on the (100) surface after drying treatment are PtCl4(OH)2 and PtCl3(OH)3, while only PtCl4(OH)2 structures can be formed on the (110) surface. This study can deepen our understanding of the interaction mechanism between Al-hydroxyl groups and Pt precursors, providing a theoretical reference for the precise placement of Pt active phases and the construction of metal-support interfaces.
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Affiliation(s)
- Kai He
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Jian Zheng
- Sinopec Research Institute of Petroleum Processing Co., Ltd., 18 Xueyuan Road, Beijing 100083, China
| | - Jianhao Jiao
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Ye Yang
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
| | - Qiang Li
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
| | - Yucai Qin
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
| | - Lijuan Song
- Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
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Wang Y, Qin S, Denisov N, Kim H, Bad'ura Z, Sarma BB, Schmuki P. Reactive Deposition Versus Strong Electrostatic Adsorption (SEA): A Key to Highly Active Single Atom Co-Catalysts in Photocatalytic H 2 Generation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2211814. [PMID: 37256585 DOI: 10.1002/adma.202211814] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 05/05/2023] [Indexed: 06/01/2023]
Abstract
In recent years, the use of single atoms (SAs) has become of a rapidly increasing significance in photocatalytic H2 generation; here SA noble metals (mainly Pt SAs) can act as highly effective co-catalysts. The classic strategy to decorate oxide semiconductor surfaces with maximally dispersed SAs relies on "strong electrostatic adsorption" (SEA) of suitable noble metal complexes. In the case of TiO2 - the classic benchmark photocatalyst - SEA calls for adsorption of cationic Pt complexes such as [(NH3 )4 Pt]2+ which then are thermally reacted to surface-bound SAs. While SEA is widely used in literature, in the present work it is shown by a direct comparison that reactive attachment based on the reductive anchoring of SAs, e.g., from hexachloroplatinic(IV) acid (H2 PtCl6 ) leads directly to SAs in a configuration with a significantly higher specific activity than SAs deposited with SEA - and this at a significantly lower Pt loading and without any thermal post-deposition treatments. Overall, the work demonstrates that the reactive deposition strategy is superior to the classic SEA concept as it provides a direct electronically well-connected SA-anchoring and thus leads to highly active single-atom sites in photocatalysis.
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Affiliation(s)
- Yue Wang
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion (WW4-LKO), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Shanshan Qin
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion (WW4-LKO), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Nikita Denisov
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion (WW4-LKO), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Hyesung Kim
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion (WW4-LKO), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
| | - Zdeněk Bad'ura
- Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, Olomouc, 78371, Czech Republic
| | - Bidyut Bikash Sarma
- Institute of Catalysis Research and Technology and Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Patrik Schmuki
- Department of Materials Science and Engineering, Chair for Surface Science and Corrosion (WW4-LKO), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058, Erlangen, Germany
- Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, Olomouc, 78371, Czech Republic
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Hellier A, Chizallet C, Raybaud P. PtO x Cl y (OH) z (H 2 O) n Complexes under Oxidative and Reductive Conditions: Impact of the Level of Theory on Thermodynamic Stabilities. Chemphyschem 2023; 24:e202200711. [PMID: 36216780 PMCID: PMC10100086 DOI: 10.1002/cphc.202200711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/07/2022] [Indexed: 02/03/2023]
Abstract
Platinum-based catalysts with Cl- , OH- , O2- and H2 O ligands, are involved in many industrial processes. Their final chemical properties are impacted by calcination and reduction applied during the preparation and activation steps. We investigate their stability under these reactive conditions with density functional theory (DFT). We benchmark various functionals (PBE-dDsC, optPBE, B3LYP, HSE06, PBE0, TPSS, RTPSS and SCAN) against ACFDT-RPA. PBE-dDsC is well adapted, although hybrid functionals are more accurate for redox reactions. Thermodynamic phase diagrams are determined by computing the chemical potential of the species as a function of temperature and partial pressures of H2 O, HCl, O2 and H2 . The stability and nature of the Pt species are highly sensitive to the activation conditions. Under O2 , high temperatures favour PtO2 while under H2 , platinum is easily reduced to Pt(0). Chlorine modifies the coordination sphere of platinum during calcination by stabilizing PtCl4 and shifts the reduction of platinum to higher temperatures under H2 .
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Affiliation(s)
- Adrien Hellier
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize, BP 3-69360, Solaize, France
| | - Céline Chizallet
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize, BP 3-69360, Solaize, France
| | - Pascal Raybaud
- IFP Energies Nouvelles, Rond-point de l'échangeur de Solaize, BP 3-69360, Solaize, France.,Univ Lyon, ENS de Lyon, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie UMR 5182, 69342, Lyon, France
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Belskaya OB, Duplyakin VK, Likholobov VA. The Role of the Stage of Metal Complex Deposition on Support in the Properties Formation of Supported Platinum Catalysts. KINETICS AND CATALYSIS 2020. [DOI: 10.1134/s0023158419060016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Borges LR, Lopez‐Castillo A, Meira DM, Gallo JMR, Zanchet D, Bueno JMC. Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al
2
O
3. ChemCatChem 2019. [DOI: 10.1002/cctc.201900092] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lais R. Borges
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Alejandro Lopez‐Castillo
- Department of ChemistryFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Debora M. Meira
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Jean Marcel R. Gallo
- Department of ChemistryFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - Daniela Zanchet
- Institute of ChemistryCampinas State University Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
| | - José Maria C. Bueno
- Department of Chemical EngineeringFederal University of São Carlos Rod. Washington Luis s/n, km 235, P.O. Box 676 13565-905 São Carlos-SP Brazil
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Belskaya OB, Mironenko RM, Gulyaeva TI, Duplyakin VK, Likholobov VA. Genesis of the active-component precursor in the synthesis of Pt/Al2O3 catalysts: III. Transformations of adsorbed platinum complexes during drying. KINETICS AND CATALYSIS 2012. [DOI: 10.1134/s0023158412050011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Carrier X, Marceau E, Lambert JF, Che M. Transformations of γ-alumina in aqueous suspensions. J Colloid Interface Sci 2007; 308:429-37. [PMID: 17286982 DOI: 10.1016/j.jcis.2006.12.074] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2006] [Revised: 12/21/2006] [Accepted: 12/30/2006] [Indexed: 10/23/2022]
Abstract
Hydration of gamma-Al2O3 is often reported to occur via the superficial transformation of the alumina surface into aluminum hydroxide-like layers. However, very little evidence has been given so far to support this hypothesis. It is demonstrated here by X-ray diffraction, TEM, electron diffraction, and solubility studies that a second process of hydration takes place that involves the dissolution of alumina and subsequent precipitation of well-shaped Al(OH)3 particles from supersaturated alumina aqueous solution. This process can be observed on a macroscopic scale (XRD, TEM) for any pH5, provided that the contact time between alumina and water exceeds 10 h. The least thermodynamically stable phase of aluminum hydroxide, bayerite, becomes favored compared with gibbsite when the pH of the solution is increased. It is assumed that the rate of formation of bayerite germs is greater than that of gibbsite due to variations in aluminum speciation in solution as a function of pH.
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Affiliation(s)
- Xavier Carrier
- Laboratoire de Réactivité de Surface (UMR 7609-CNRS), Université Pierre & Marie Curie-Paris 6, 4 place Jussieu, 75252 Paris Cedex 05, France.
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Lambert JF, Che M. The molecular approach to supported catalysts synthesis: state of the art and future challenges. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00318-6] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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