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Müller M, Kutscherauer M, Böcklein S, Wehinger G, Turek T, Mestl G. Modeling the selective oxidation of n-butane to maleic anhydride: From active site to industrial reactor. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Faizan M, Zhang R, Liu R. Vanadium Phosphorus Oxide Catalyst: Progress, Development and Applications. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.02.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Badehbakhsh S, Saadatkhah N, Mahboub MJD, Guerrero-Pérez O, Patience GS. Morphological changes of vanadyl pyrophosphate due to thermal excursions. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Guerrero-Pérez M, López-Medina R, Rojas-Garcia E, Bañares M. XANES study of the dynamic states of V-based oxide catalysts under partial oxidation reaction conditions. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.12.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Atomic-Scale Understanding of Structure and Properties of Complex Pyrophosphate Crystals by First-Principles Calculations. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9050840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The electronic structure and mechanical and optical properties of five pyrophosphate crystals with very complex structures are studied by first principles density functional theory calculations. The results show the complex interplay of the minor differences in specific local structures and compositions can result in large differences in reactivity and interaction that are rare in other classes of inorganic crystals. These are discussed by dividing the pyrophosphate crystals into three structural units. H2P2O7 is the most important and dominating unit in pyrophosphates. The other two are the influential cationic group with metals and water molecules. The strongest P-O bond in P2O5 is the strongest bond for crystal cohesion, but O-H and N-H bonds also play an important part. Different type of bonding between O and H atoms such as O-H, hydrogen bonding, and bridging bonds are present. Metallic cations such as Mg, Zn, and Cu form octahedral bonding with O. The water molecule provides the unique H∙∙∙O bonds, and metallic elements can influence the structure and bonding to a certain extent. The two Cu-containing phosphates show the presence of narrow metallic bands near the valence band edge. All this complex bonding affects their physical properties, indicating that fundamental understanding remains an open question.
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Adhikari P, Khaoulaf R, Ez-Zahraouy H, Ching WY. Complex interplay of interatomic bonding in a multi-component pyrophosphate crystal: K 2Mg (H 2P 2O 7) 2·2H 2O. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170982. [PMID: 29308239 PMCID: PMC5750006 DOI: 10.1098/rsos.170982] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 10/30/2017] [Indexed: 06/07/2023]
Abstract
The electronic structure and interatomic bonding of pyrophosphate crystal K2Mg (H2P2O7)2·2H2O are investigated for the first time showing complex interplay of different types of bindings. The existing structure from single-crystal X-ray diffraction is not sufficiently refined, resulting in unrealistic short O─H bonds which is rectified by high-precision density functional theory (DFT) calculation. K2Mg (H2P2O7)2·2H2O has a direct gap of 5.22 eV and a small electron effective mass of 0.14 me. Detailed bond analysis between every pair of atoms reveals the complexity of various covalent, ionic, hydrogen bonding and bridging bonding and their sensitive dependence on structural differences. The K--O bonds are much weaker than Mg--O bonds and contributions from the hydrogen bonds are non-negligible. Quantitative analysis of internal cohesion in terms of total bond order density and partial bond order density divulges the relative importance of different types of bonding. The calculated optical absorptions show multiple peaks and a sharp Plasmon peak at 23 eV and a refractive index of 1.44. The elastic and mechanical properties show features unique to this low-symmetry crystal. Phonon calculation gives vibrational frequencies in agreement with reported Raman spectrum. These results provide new insights indicating that acidic pyrophosphates could have a variety of unrealized applications in advanced technology.
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Affiliation(s)
- Puja Adhikari
- Department of Physics and Astronomy, University of Missouri Kansas City, Kansas City, MO 64110, USA
| | - Redouane Khaoulaf
- Department of Physics, Laboratory of Optoelectronics and Physical Chemistry of Materials, Faculty of Sciences, University lbn Tofail, Kenitra, Morocco
- Laboratory of Condensed Matter and Interdisciplinary Sciences (LAMCSCI), Faculty of Sciences, University Mohammed V, Rabat, Morocco
| | - Hamid Ez-Zahraouy
- Laboratory of Condensed Matter and Interdisciplinary Sciences (LAMCSCI), Faculty of Sciences, University Mohammed V, Rabat, Morocco
| | - Wai-Yim Ching
- Department of Physics and Astronomy, University of Missouri Kansas City, Kansas City, MO 64110, USA
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Heenemann M, Heine C, Hävecker M, Trunschke A, Schlögl R. Influence of Steam on a Vanadyl Pyrophosphate Catalyst During Propane Oxidation. J Phys Chem B 2017; 122:695-704. [DOI: 10.1021/acs.jpcb.7b06314] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Heenemann
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Christian Heine
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Michael Hävecker
- Department
Heterogeneous Reactions, Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Annette Trunschke
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Robert Schlögl
- Department
of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Department
Heterogeneous Reactions, Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
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Tokarz-Sobieraj R, Witko M. Electronic Properties of the Active Sites Present at the (011) Surface of MoO2. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/0263-6174.25.8.583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The DFT method was used to describe the electronic structure of the catalytically interesting (011) surface of molybdenum dioxide, with attention being particularly focused on the properties of the active sites, both molybdenum and oxygen, present at this surface. In addition, a comparison of (011)MoO2 and (100)MoO3 surfaces was undertaken since both surfaces contain not only differently coordinated oxygen sites but also the bare molybdenum centres. The electronic structures of both surfaces were obtained using the cluster method and DFT approach. The local properties of the different surface sites exposed at the (011)MoO2 surface, viz. five- and six-fold coordinated Mo atoms and nucleophilic O sites with different coordination numbers, have been discussed using charge densities, bond-order indices and molecular orbital diagrams.
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Affiliation(s)
- Renata Tokarz-Sobieraj
- Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
| | - Malgorzata Witko
- Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
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van Santen RA, Tranca I, Hensen EJ. Theory of surface chemistry and reactivity of reducible oxides. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.07.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Taufiq-Yap YH, Yuen CS, Suziana N@MN, Irmawati R. Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst. CHINESE JOURNAL OF CATALYSIS 2014. [DOI: 10.1016/s1872-2067(12)60749-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dummer N, Bartley J, Hutchings G. Vanadium Phosphate Materials as Selective Oxidation Catalysts. ADVANCES IN CATALYSIS 2011. [DOI: 10.1016/b978-0-12-387772-7.00004-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Rownaghi AA, Taufiq-Yap YH, Rezaei F. High Surface Area Vanadium Phosphate Catalysts for n-Butane Oxidation. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900238a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ali Asghar Rownaghi
- Department of Chemical Engineering, Monash University, Victoria 3800, Australia, and Department of Chemistry, Universiti Putra Malaysia, 43400, Selangor, Malaysia
| | - Yun Hin Taufiq-Yap
- Department of Chemical Engineering, Monash University, Victoria 3800, Australia, and Department of Chemistry, Universiti Putra Malaysia, 43400, Selangor, Malaysia
| | - Fateme Rezaei
- Department of Chemical Engineering, Monash University, Victoria 3800, Australia, and Department of Chemistry, Universiti Putra Malaysia, 43400, Selangor, Malaysia
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Thompson D, Hodnett BK. Hydrocarbon Selective Oxidation on Vanadium Phosphorus Oxide Catalysts: Insights from Electronic Structure Calculations. Top Catal 2008. [DOI: 10.1007/s11244-008-9100-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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VPO catalyst for n-butane oxidation to maleic anhydride: A goal achieved, or a still open challenge? Top Catal 2006. [DOI: 10.1007/s11244-006-0080-z] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Thompson D, Fanning M, Hodnett B. The interplay of electrostatic and covalent effects in 1-butene oxidation over vanadyl pyrophosphate. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(03)00459-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Petit S, Borshch SA, Robert V. Exchange interactions in the three phases of vanadyl pyrophosphate (VO)(2)P(2)O(7). J Am Chem Soc 2002; 124:1744-9. [PMID: 11853452 DOI: 10.1021/ja011812d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The magnetic exchange constants of vanadyl pyrophosphate (VO)(2)P(2)O(7) have been calculated on the basis of a combined DFT/broken symmetry approach. The three reported phases, ambient-pressure orthorhombic, ambient-pressure monoclinic, and high-pressure orthorhombic, have been explicitly considered. Calculations have been performed on four types of model clusters extracted from the crystal lattices. The singularity of each phase is clearly reflected through the number and values of exchange parameters. Our results show that the exchange interactions can be described in first approximation within the alternating antiferromagnetic chain model. The largest exchange coupling along the chain occurs through O-P-O bridges. The interchain interactions are much weaker and are of ferromagnetic nature.
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Affiliation(s)
- Sébastien Petit
- Institut de Recherches sur la Catalyse, UPR 5401, 2, Avenue Albert Einstein, 69626 Villeurbanne Cedex, France
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