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      • Record: found
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      In-depth analysis of embedded-type structures of Ni xMg 4-xAl LDO-composited catalysts and the impacts on glycerol conversion under a base- and H 2-free condition

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          Abstract

          Core-shell composite catalysts composing of AgO@SnO 2/ZSM-5 embedded by Ni xMg 4-xAlO LDOs with various Ni/Mg ratios were characterized and tested for the activity on the conversion of glycerol to valuable chemicals under a base-free and external H 2-free condition. As a result, the catalytic performance of an embedded composite was found greater than that of its individual constituents, owing to the synergy between a Ni xMg 4-xAlO lodge and embedded AgO@SnO 2/ZSM-5. The highest yield of 1,2-propanediol and lactic acid was achieved at the Ni/Mg ratio of 0.2/3.8. Ni xMg 4-xAlO lodges were found to simultaneously drive glycerol dehydration to acetol and glycerol reforming, driven by Ni sites, forming in-situ H 2 that enhances 1,2-propanediol formation whereas the AgO@SnO 2/ZSM-5 clusters governed acetol oxidation and Cannizzaro reaction that led to the formation of lactic acid. At a high Ni/Mg ratio, the Ni xMg 4-xAlO lodges completely covered AgO@SnO 2/ZSM-5 clusters entirely, resulting in the suppression of lactic acid yield due to over-oxidation.

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          Highlights

          • •

            In-depth analysis of Ni xMg 4-xAlO-embedded AgO@SnO 2/ZSM-5 composite catalysts.

          • •

            Composite catalysts proven to drive consecutive reactions from glycerol to lactic acid.

          • •

            Formation of 1,2-propanediol and lactic acid made possible owing to the synergy among components.

          • •

            Change of Ni content in Ni-LDO altered the degree of embedment and product selectivity.

          • •

            Complete coverage of AgO@SnO 2/ZSM-5 by Ni xMg 4-xAlO suppressed lactic acid yield due to over-oxidation.

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          Most cited references60

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          ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT.

          B Ravel, M Newville (2005)
          A software package for the analysis of X-ray absorption spectroscopy (XAS) data is presented. This package is based on the IFEFFIT library of numerical and XAS algorithms and is written in the Perl programming language using the Perl/Tk graphics toolkit. The programs described here are: (i) ATHENA, a program for XAS data processing, (ii) ARTEMIS, a program for EXAFS data analysis using theoretical standards from FEFF and (iii) HEPHAESTUS, a collection of beamline utilities based on tables of atomic absorption data. These programs enable high-quality data analysis that is accessible to novices while still powerful enough to meet the demands of an expert practitioner. The programs run on all major computer platforms and are freely available under the terms of a free software license.
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            Core–shell structured catalysts for thermocatalytic, photocatalytic, and electrocatalytic conversion of CO 2

            Sonali Das, Javier Pérez-Ramírez, Jinlong Gong … (2020)
            An in-depth assessment of properties of core–shell catalysts and their application in the thermocatalytic, photocatalytic, and electrocatalytic conversion of CO 2 into synthesis gas and valuable hydrocarbons. Catalytic conversion of CO 2 to produce fuels and chemicals is attractive in prospect because it provides an alternative to fossil feedstocks and the benefit of converting and cycling the greenhouse gas CO 2 on a large scale. In today's technology, CO 2 is converted into hydrocarbon fuels in Fischer–Tropsch synthesis via the water gas shift reaction, but processes for direct conversion of CO 2 to fuels and chemicals such as methane, methanol, and C 2+ hydrocarbons or syngas are still far from large-scale applications because of processing challenges that may be best addressed by the discovery of improved catalysts—those with enhanced activity, selectivity, and stability. Core–shell structured catalysts are a relatively new class of nanomaterials that allow a controlled integration of the functions of complementary materials with optimised compositions and morphologies. For CO 2 conversion, core–shell catalysts can provide distinctive advantages by addressing challenges such as catalyst sintering and activity loss in CO 2 reforming processes, insufficient product selectivity in thermocatalytic CO 2 hydrogenation, and low efficiency and selectivity in photocatalytic and electrocatalytic CO 2 hydrogenation. In the preceding decade, substantial progress has been made in the synthesis, characterization, and evaluation of core–shell catalysts for such potential applications. Nonetheless, challenges remain in the discovery of inexpensive, robust, regenerable catalysts in this class. This review provides an in-depth assessment of these materials for the thermocatalytic, photocatalytic, and electrocatalytic conversion of CO 2 into synthesis gas and valuable hydrocarbons.
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              Efficient selective and atom economic catalytic conversion of glycerol to lactic acid.

              Michael G Manas, Robert Crabtree, Jesús Campos … (2014)
              The availability of glycerol is rapidly increasing due to the expanding biodiesel industry, which produces this polyol as the main waste material. Several value-added chemicals have been synthesized using glycerol as a feedstock; however, the conversion of glycerol to lactic acid has been investigated to a lesser extent despite the numerous and novel uses of lactic acid. We report a family of iridium complexes as the first homogeneous catalysts for the conversion of glycerol to lactic acid. These have higher activity and selectivity than the previously reported heterogeneous systems. In addition, hydrogen gas is generated as a useful byproduct. Unlike prior systems, the reactions can be performed in air, under mild conditions and without solvent. Our method has even been applied to samples of crude glycerol waste derived from the biodiesel industry without prior purification, albeit with somewhat lower activity while maintaining the same high selectivity.
              Article 0 comments Cited 50 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Sirirat Jitkarnka
                Journal
                Journal ID (nlm-ta): Heliyon
                Journal ID (iso-abbrev): Heliyon
                Title: Heliyon
                Publisher: Elsevier
                ISSN (Electronic): 2405-8440
                Publication date PMC-release: 28 April 2024
                Publication date Collection: 15 May 2024
                Publication date (Electronic): 28 April 2024
                Volume: 10
                Issue: 9
                Electronic Location Identifier: e30325
                Affiliations
                [a ]The Petroleum and Petrochemical College, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
                [b ]Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
                [c ]Synchrotron Light Research Institute, 111 University Avenue, Suranaree, Muang District, Nakhon Ratchasima, 30000, Thailand
                Author notes
                [* ]Corresponding author. sirirat.j@ 123456chula.ac.th
                Article
                Publisher Item ID: S2405-8440(24)06356-4 Publisher ID: e30325
                DOI: 10.1016/j.heliyon.2024.e30325
                PMC ID: 11088269
                PubMed ID: 38737254
                SO-VID: f5143f01-e6b0-4a39-a955-de2cfdb74e82
                Copyright © © 2024 The Authors
                License:

                This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

                History
                Date received : 20 December 2023
                Date revision received : 23 March 2024
                Date accepted : 23 April 2024
                Categories
                Subject: Research Article

                Keywords: glycerol,bio-based chemicals,lactic acid,1,2-propanediol,sustainability
                Data availability:
                Keywords: glycerol, bio-based chemicals, lactic acid, 1,2-propanediol, sustainability

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