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Bandalla S, Dosarapu V, Bathula GB, Ravula M, Yadagiri J, Gogoi P, Baithy M, Jonnalagadda SB, Vasam CS. Highly efficient solvent-free oxidation of cyclohexanol to cyclohexanone over nanocrystalline CaO–MgO binary metal-oxide catalysts. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Yu W, Qi J, Hu X, Qiao S, Shang J, Liu L, Wang B, Tang L, Zhang W, Cheng Y. A-site deficient La 0.52Sr 0.28Ti 0.94Ni 0.06O 3by low-pulsed electric current treatment: achieved exsolution of B-site Ni nanoparticles and significant improvement of electrocatalytic properties. NANOTECHNOLOGY 2022; 33:285703. [PMID: 35385834 DOI: 10.1088/1361-6528/ac64ac] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Perovskite materials with exsolved nanoparticles have a wide range of applications in energy conversion systems owing to their unique basal plane active sites and excellent catalytic properties. The introduction of A-site deficiency can help the formation of highly mobile oxygen vacancies and remarkably enhance the reducibility of Ni nanoparticles, thus significantly increasing electronic conductivity and catalytic activity simultaneously. Herein, we adopt pulsed electric current (PEC) treatment, a novel approach instead of the long-time high-temperature reduction technique, and for the first time review that the exsolution of minuscule Ni nanoparticles (8-20 nm) could be facilitated on Ni-doped La0.52Sr0.28Ti0.94Ni0.06O3(LSTN) anodes with A-site deficiency. Encouragingly, finding that low PEC can successfully lead to nanoparticle exsolution and show a significantly improved oxygen evolution reaction performance of LSTN-PEC (LSTN after PEC treatment) possessing A-site deficiency, the onset potential of LSTN-PEC (500 V) (LSTN after PEC treatment with 500 V-4 Hz-90 s) was advanced by 0.173 V, theRctvalue was reduced by 82.38 Ω·cm2, and the overpotential was also reduced by 73 mV.
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Affiliation(s)
- Wenwen Yu
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Jingang Qi
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Xin Hu
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Sifan Qiao
- Electron Microscopy Center, and School of Materials Science and Engineering, Jilin University, Changchun Jilin 130012, People's Republic of China
| | - Jian Shang
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Liang Liu
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Bing Wang
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Lidan Tang
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
| | - Wei Zhang
- Electron Microscopy Center, and School of Materials Science and Engineering, Jilin University, Changchun Jilin 130012, People's Republic of China
| | - Yu Cheng
- School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, People's Republic of China
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Underhill R, Douthwaite M, Lewis RJ, Miedziak PJ, Armstrong RD, Morgan DJ, Freakley SJ, Davies T, Folli A, Murphy DM, He Q, Akdim O, Edwards JK, Hutchings GJ. Ambient base-free glycerol oxidation over bimetallic PdFe/SiO2 by in situ generated active oxygen species. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-020-04333-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AbstractLow temperature oxidation of alcohols over heterogeneous catalysts is exceptionally challenging, particularly under neutral conditions. Herein, we report on an efficient, base-free method to oxidise glycerol over a 0.5%Pd-0.5%Fe/SiO2 catalyst at ambient temperature in the presence of gaseous H2 and O2. The exceptional catalytic performance was attributed to the in situ formation of highly reactive surface-bound oxygenated species, which promote the dehydrogenation on the alcohol. The PdFe bimetallic catalyst was determined to be significantly more active than corresponding monometallic analogues, highlighting the important role both metals have in this oxidative transformation. Fe leaching was confirmed to occur over the course of the reaction but sequestering experiments, involving the addition of bare carbon to the reactions, confirmed that the reaction was predominantly heterogeneous in nature. Investigations with electron paramagnetic resonance spectroscopy suggested that the reactivity in the early stages was mediated by surface-bound reactive oxygen species; no homogeneous radical species were observed in solution. This theory was further evidenced by a direct H2O2 synthesis study, which confirmed that the presence of Fe in the bimetallic catalyst neither improved the synthesis of H2O2 nor promoted its decomposition over the PdFe/SiO2 catalyst.
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Abstract
The transformation of biomass and the utilization of all the by products derived from chemical conversion of biomass resources is one of the most important challenges nowadays. The impact in society and the level of awareness that already exists inside and outside the scientific community, makes the challenge of improving conversion of biomass to commodities a hot topic. Glycerol, a by-product obtained from the biodiesel production, is a key player compound due to its chemical versatility. The possibility of being used as solvent, reagent, reducing agent (in the polyol method), and so forth, makes glycerol an extremely appealing commodity. When used within nanotechnology, namely combined with nanomaterials, its potential becomes even higher. This review summarizes the work developed by the scientific community, during the last five years, in the use of glycerol with nano oxides. The analysis goes from the simple role of solvent to the oxidation of glycerol by nano oxides.
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