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Novel Complex Titanium NASICON-Type Phosphates as Acidic Catalysts for Ethanol Dehydration. Catalysts 2023. [DOI: 10.3390/catal13010185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The conversion of ethanol towards ethylene and diethyl ether in the presence of catalysts requires special consideration from the perspective of green chemistry. Ethanol dehydration was studied on a complex titanium phosphate MAlTiP (M0.5(1+x)AlxTi2-x(PO4)3 with M = Ni, Mn (x = 0; 0.2)) catalysts, alongside a NASICON-type structure synthesized by the sol–gel method. The initial catalysts were characterized by N2 gas sorption, SEM, XRD and spectroscopic methods (Raman and DRIFT of adsorbed CO and C6H6). The results revealed that all catalysts exhibited high activity and selectivity at 300–420 °C. The conversion of ethanol increases with the reaction temperature, reaching 67–80% at 420 °C. The MnAlTiP exhibited the highest ethylene selectivity among other catalysts, with 87% at 420 °C. The aluminum modification improved the acid properties of the catalysts, due to the appearance of Lewis acid sites (LAS) and the strength moderate Brønsted acid sites (BAS). It was shown that the activity of complex phosphates in ethanol dehydration increases with the strength of the Brønsted acid sites (BAS).
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Applications of in-situ wide spectral range infrared absorption spectroscopy for CO oxidation over Pd/SiO2 and Cu/SiO2 catalysts. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)64054-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hu F, Fu C, Zhao C, Liu P, Tian W, Chen B, Pan H, Lin Q. Effect of Shell Thickness on the Properties of Multi-Pd Cores-Hollow Carbon Shell Catalyst mPd@HCS. CATALYSIS SURVEYS FROM ASIA 2022. [DOI: 10.1007/s10563-022-09362-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Stucchi M, Vasile F, Cattaneo S, Villa A, Chieregato A, Vandegehuchte BD, Prati L. An Insight into the Role of Reactant Structure Effect in Pd/C Catalysed Aldehyde Hydrogenation. NANOMATERIALS 2022; 12:nano12060908. [PMID: 35335722 PMCID: PMC8955477 DOI: 10.3390/nano12060908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/01/2022] [Accepted: 03/04/2022] [Indexed: 11/19/2022]
Abstract
The different activity of a 1% Pd/carbon catalyst towards aromatic and aliphatic aldehydes hydrogenation has been explored by 13C NMR relaxation. The ratio between T1 relaxation times of adsorbed (ads) and free diffusing (bulk) molecules (T1ads/T1bulk) can be used as an indicator of the relative strength of interaction between the reactant and the catalytic surface, where the lower the T1ads/T1bulk, the higher the adsorption strength. It can be seen that 1% Pd/carbon showed a reverse catalytic behaviour towards benzaldehyde and octanal hydrogenation, which can be explained by analysing the T1 relaxation times related to each substrate in the presence of the catalyst. Comparing and correlating the different T1ads/T1bulk values, we were able to prove that the different catalytic results mainly depend on the contrasting adsorption behaviour of substrates on the catalyst. Moreover, the role of the solvent has been disclosed, as NMR results revealed that the adsorption of the reactants was strongly affected by the choice of solvent, which is revealed to be critical in modulating catalytic activity. As a consequence, T1ads/T1bulk measurements can provide a guide to the selection of appropriate reaction conditions for improving catalytic activity.
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Affiliation(s)
- Marta Stucchi
- Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy; (M.S.); (F.V.); (S.C.); (A.V.)
| | - Francesca Vasile
- Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy; (M.S.); (F.V.); (S.C.); (A.V.)
| | - Stefano Cattaneo
- Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy; (M.S.); (F.V.); (S.C.); (A.V.)
| | - Alberto Villa
- Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy; (M.S.); (F.V.); (S.C.); (A.V.)
| | - Alessandro Chieregato
- TotalEnergies Research Center—Qatar (TRCQ), Qatar Science & Technology Park, Al Gharrafa, Doha P.O. Box 9803, Qatar;
| | | | - Laura Prati
- Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy; (M.S.); (F.V.); (S.C.); (A.V.)
- Correspondence: ; Tel.: +39-02503-14357
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Wu Q, Zhou S, Fu C, Zhang J, Chen B, Pan H, Lin Q. Direct synthesis of H 2O 2 over Pd–M@HCS (M = Sn, Fe, Co, or Ni): effects of non-noble metal M on the electronic state and particle size of Pd. NEW J CHEM 2022. [DOI: 10.1039/d2nj01074g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Direct synthesis of H2O2 in a yolk–shell structure assisted by M (M = Fe,Co,Ni,Sn) metal doping.
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Affiliation(s)
- Quansheng Wu
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Songhua Zhou
- Guizhou Tianfu Chemical Co.,LTD, Qiannan, Guizhou 558000, China
| | - Chengbing Fu
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Jiesong Zhang
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Bo Chen
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
| | - Hongyan Pan
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
- State key laboratory of efficient utilization for low grade phosphate rock and its associated resources, Guiyang, Guizhou 550005, China
| | - Qian Lin
- Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, and Guizhou Key Laboratory for Green Chemical and Clean Energy Technology, Guiyang, Guizhou 550025, China
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Shivhare A, Kumar A, Srivastava R. The Size‐Dependent Catalytic Performances of Supported Metal Nanoparticles and Single Atoms for the Upgrading of Biomass‐Derived 5‐Hydroxymethylfurfural, Furfural, and Levulinic acid. ChemCatChem 2021. [DOI: 10.1002/cctc.202101423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Atal Shivhare
- Catalysis Research Laboratory Department of Chemistry IIT Ropar Rupnagar Punjab-140001 India
| | - Atul Kumar
- Catalysis Research Laboratory Department of Chemistry IIT Ropar Rupnagar Punjab-140001 India
| | - Rajendra Srivastava
- Catalysis Research Laboratory Department of Chemistry IIT Ropar Rupnagar Punjab-140001 India
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Promotional effect of surface plasmon resonance on direct formation of hydrogen peroxide from H2 and O2 over Pd/Graphene-Au nanorod catalytic system. J Catal 2021. [DOI: 10.1016/j.jcat.2020.05.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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