1
|
Catalytic Properties of the Spinel-Like CuxMn3−xO4 Copper Manganese Oxides—An Overview. Catalysts 2023. [DOI: 10.3390/catal13010129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Copper manganese oxide spinels and related (multiphase) materials with the formula CuxMn3−xO4 are the active catalysts in a wide variety of industrially important processes due to their great diversity in their phase relations, metal ion valence/site distribution, and chemical properties. In this review, we summarize the preparation methods and their effects on the composition, properties, and catalytic properties of various CuxMn3−xO4 catalysts with various Cu/Mn ratios. The main summarized catalytic reactions are the oxidation of carbon monoxide, nitrogen oxide, and hydrogen sulfide and the oxidative removal of organic solvents such as benzene, toluene, and xylene from the air. Some industrially important reactions (steam reforming of methanol or synthesis gas) and the manufacture of organic chemicals (methyl formate, propylene oxide, and benzyl alcohol) catalyzed by CuxMn3−xO4 spinels are also reviewed.
Collapse
|
2
|
Béres KA, Sajó IE, Lendvay G, Trif L, Petruševski VM, Barta-Holló B, Korecz L, Franguelli FP, László K, Szilágyi IM, Kótai L. Solid-Phase "Self-Hydrolysis" of [Zn(NH 3) 4MoO 4@2H 2O] Involving Enclathrated Water-An Easy Route to a Layered Basic Ammonium Zinc Molybdate Coordination Polymer. Molecules 2021; 26:4022. [PMID: 34209392 PMCID: PMC8272139 DOI: 10.3390/molecules26134022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/22/2021] [Accepted: 06/23/2021] [Indexed: 11/16/2022] Open
Abstract
An aerial humidity-induced solid-phase hydrolytic transformation of the [Zn(NH3)4]MoO4@2H2O (compound 1@2H2O) with the formation of [(NH4)xH(1-x)Zn(OH)(MoO4)]n (x = 0.92-0.94) coordination polymer (formally NH4Zn(OH)MoO4, compound 2) is described. Based on the isostructural relationship, the powder XRD indicates that the crystal lattice of compound 1@2H2O contains a hydrogen-bonded network of tetraamminezinc (2+) and molybdate (2-) ions, and there are cavities (O4N4(μ-H12) cube) occupied by the two water molecules, which stabilize the crystal structure. Several observations indicate that the water molecules have no fixed positions in the lattice voids; instead, the cavity provides a neighborhood similar to those in clathrates. The @ symbol in the notation is intended to emphasize that the H2O in this compound is enclathrated rather than being water of crystallization. Yet, signs of temperature-dependent dynamic interactions with the wall of the cages can be detected, and 1@2H2O easily releases its water content even on standing and yields compound 2. Surprisingly, hydrolysis products of 1 were observed even in the absence of aerial humidity, which suggests a unique solid-phase quasi-intramolecular hydrolysis. A mechanism involving successive substitution of the ammonia ligands by water molecules and ammonia release is proposed. An ESR study of the Cu-doped compound 2 (2#dotCu) showed that this complex consists of two different Cu2+(Zn2+) environments in the polymeric structure. Thermal decomposition of compounds 1 and 2 results in ZnMoO4 with similar specific surface area and morphology. The ZnMoO4 samples prepared from compounds 1 and 2 and compound 2 in itself are active photocatalysts in the degradation of Congo Red dye. IR, Raman, and UV studies on compounds 1@2H2O and 2 are discussed in detail.
Collapse
Affiliation(s)
- Kende Attila Béres
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - István E. Sajó
- Szentagothai Research Centre, Environmental Analytical and Geoanalytical Research Group, University of Pécs, Ifjúság Útja 20, 7624 Pécs, Hungary;
| | - György Lendvay
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - László Trif
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - Vladimir M. Petruševski
- Faculty of Natural Sciences and Mathematics, Ss. Cyryl and Methodius University, 1000 Skopje, North Macedonia;
| | - Berta Barta-Holló
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia;
| | - László Korecz
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - Fernanda Paiva Franguelli
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - Krisztina László
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - László Kótai
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
- Deuton-X Ltd., Selmeci u. 89, 2030 Érd, Hungary
| |
Collapse
|
3
|
Béres KA, Petruševski V, Holló BB, Németh P, Fogaça L, Paiva Franguelli F, Farkas A, Menyhárd A, Szilágyi IM, Kótai L. AgNO
3
⋅NH
4
NO
3
– an enigmatic double‐salt type “decomposition intermediate” of diamminesilver(I) permanganate. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kende Attila Béres
- Institute of Materials and Environmental Chemistry Research Centre for Natural Sciences, ELKH Magyar tudósok krt. 2 1117 Budapest Hungary
| | - Vladimir Petruševski
- Faculty of Natural Sciences and Mathematics Ss. Cyryl and Methodius University Skopje Macedonia
| | - Berta Barta Holló
- Department of Chemistry Biochemistry and Environmental Protection Faculty of Sciences University of Novi Sad Trg Dositeja Obradovića 3 21000 Novi Sad Serbia
| | - Péter Németh
- Institute for Geological and Geochemical Research Research Centre for Natural Sciences ELKH, Budaörsi street 45 1112 Budapest Hungary
- Research Institute of Biomolecular and Chemical Engineering University of Pannonia Egyetem út 10 8200 Veszprém Hungary
| | - Lara Fogaça
- Institute of Materials and Environmental Chemistry Research Centre for Natural Sciences, ELKH Magyar tudósok krt. 2 1117 Budapest Hungary
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics Műegyetem rakpart 3 1111 Budapest Hungary
| | - Fernanda Paiva Franguelli
- Institute of Materials and Environmental Chemistry Research Centre for Natural Sciences, ELKH Magyar tudósok krt. 2 1117 Budapest Hungary
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics Műegyetem rakpart 3 1111 Budapest Hungary
| | - Attila Farkas
- Department of Organic Chemistry Budapest University of Technology and Economics Műegyetem rakpart 3 1111 Budapest Hungary
| | - Alfréd Menyhárd
- Department of Physical Chemistry and Materials Science Budapest University of Technology and Economics Műegyetem rakpart 3 1111 Budapest Hungary
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry Budapest University of Technology and Economics Műegyetem rakpart 3 1111 Budapest Hungary
| | - László Kótai
- Institute of Materials and Environmental Chemistry Research Centre for Natural Sciences, ELKH Magyar tudósok krt. 2 1117 Budapest Hungary
- Deuton-X Ltd. Selmeci. U. 89 H-2030 Érd Hungary
| |
Collapse
|
4
|
Solt H, Németh P, Mohai M, Sajó IE, Klébert S, Franguelli FP, Fogaca LA, Pawar RP, Kótai L. Temperature-Limited Synthesis of Copper Manganites along the Borderline of the Amorphous/Crystalline State and Their Catalytic Activity in CO Oxidation. ACS OMEGA 2021; 6:1523-1533. [PMID: 33490812 PMCID: PMC7818585 DOI: 10.1021/acsomega.0c05301] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
Copper manganese oxides (CMO) with CuMn2O4 composition are well-known catalysts, which are widely used for the oxidative removal of dangerous chemicals, e.g., enhancing the CO to CO2 conversion. Their catalytic activity is the highest, close to those of the pre-crystalline and amorphous states. Here we show an easy way to prepare a stable CMO material at the borderline of the amorphous and crystalline state (BAC-CMO) at low temperatures (<100 °C) followed annealing at 300 °C and point out its excellent catalytic activity in CO oxidation reactions. We demonstrate that the temperature-controlled decomposition of [Cu(NH3)4](MnO4)2 in CHCl3 and CCl4 at 61 and 77 °C, respectively, gives rise to the formation of amorphous CMO and NH4NO3, which greatly influences the composition as well as the Cu valence state of the annealed CMOs. Washing with water and annealing at 300 °C result in a BAC-CMO material, whereas the direct annealing of the as-prepared product at 300 °C gives rise to crystalline CuMn2O4 (sCMO, 15-40 nm) and ((Cu,Mn)2O3, bCMO, 35-40 nm) mixture. The annealing temperature influences both the quantity and crystallite size of sCMO and bCMO products. In 0.5% CO/0.5% O2/He mixture the best CO to CO2 conversion rates were achieved at 200 °C with the BAC-CMO sample (0.011 mol CO2/(m2 h)) prepared in CCl4. The activity of this BAC-CMO at 125 °C decreases to half of its original value within 3 h and this activity is almost unchanged during another 20 h. The BAC-CMO catalyst can be regenerated without any loss in its catalytic activity, which provides the possibility for its long-term industrial application.
Collapse
Affiliation(s)
- Hanna
E. Solt
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - Péter Németh
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Earth and Environmental Sciences, University
of Pannonia, Egyetem
út 10, Veszprém H-8200, Hungary
| | - Miklós Mohai
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - István E. Sajó
- Szentágothai
Research Center, University of Pécs, Ifjúság útja
20, Pécs H-7624, Hungary
| | - Szilvia Klébert
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - Fernanda Paiva Franguelli
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Magyarország
| | - Lara Alexandre Fogaca
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Magyarország
| | - Rajendra P. Pawar
- Organic
Chemistry Department, Deogiri College, Station Road, Aurangabad 431005, Maharastra, India
| | - László Kótai
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Deuton-X
Ltd., Selmeci ut 89, Érd 2030, Hungary
| |
Collapse
|
5
|
Sajó I, Kótai L, Keresztury G, Gács I, Pokol G, Kristóf J, Soptrayanov B, Petrusevski V, Timpu D, Sharma P. Studies on the Chemistry of Tetraamminezinc(II) Dipermanganate ([Zn(NH3)4](MnO4)2): Low-Temperature Synthesis of the Manganese Zinc Oxide (ZnMn2O4) Catalyst Precursor. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890180] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|