Aerobic Selective Oxidation of Glucose to Gluconate Catalyzed by Au/Al2O3 and Au/C: Impact of the Mass-Transfer Processes on the Overall Kinetics Full article
| Journal |
Chemical Engineering Journal
ISSN: 1385-8947 , E-ISSN: 1873-3212 |
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| Output data | Year: 2013, Volume: 223, Pages: 921-931 Pages count : 11 DOI: 10.1016/j.cej.2012.11.073 | ||||||
| Tags | Alumina, Carbon, Gluconic acid, Glucose, Gold catalyst, Mass transfer, Selective oxidation | ||||||
| Authors |
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| Affiliations |
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Funding (4)
| 1 | Russian Foundation for Basic Research | 09-03-12272 |
| 2 | Russian Foundation for Basic Research | 11-03-01022 |
| 3 | The Ministry of Education and Science of the Russian Federation | |
| 4 | Council for Grants of the President of the Russian Federation | НШ-524.2012.3 |
Abstract:
Aerobic oxidation of glucose in the presence of Au/Al2O3 catalysts with different dispersion of supported gold and Au/C catalysts containing highly dispersed gold nanoparticles was studied at varied glucose:Au molar ratios. The studies were focused on determining the contribution of the mass-transfer processes to the overall reaction kinetics in different regimes. The Au/Al2O3 catalysts were more active than the Au/C catalysts at high glucose:Au molar ratios. Among the alumina-supported catalysts with different metal dispersion, the highest TOF at high glucose:Au molar ratios was characteristic of the Au/Al2O3 catalysts bearing metal particles of 1–5 nm in size. Under these conditions, the high effectiveness factor of the Au/Al2O3 catalysts (>95%) was observed at a uniform gold distribution through the support granules. For the Au/C catalysts with the non-uniform distribution of gold nanoparticles through the catalyst grains, the apparent reaction rate was affected by internal diffusion (the effectiveness factor of a catalyst grain is ca. 70%), while the interface gas–liquid–solid oxygen transfer influenced the overall reaction kinetics as well. At a low glucose:Au molar ratio the reaction rate was limited by oxygen dissolution in the aqueous phase. In this mass transfer regime the rate of glucose oxidation over the carbon-supported catalysts exceeds the reaction rate over the alumina-supported catalyst, which is attributed to a higher adhesion of the hydrophobic carbon support to the gas–liquid interface facilitating the oxygen mass transfer towards catalytic sites.
Cite:
Delidovich I.V.
, Moroz B.L.
, Taran O.P.
, Gromov N.V.
, Pyrjaev P.A.
, Prosvirin I.P.
, Bukhtiyarov V.I.
, Parmon V.N.
Aerobic Selective Oxidation of Glucose to Gluconate Catalyzed by Au/Al2O3 and Au/C: Impact of the Mass-Transfer Processes on the Overall Kinetics
Chemical Engineering Journal. 2013. V.223. P.921-931. DOI: 10.1016/j.cej.2012.11.073 WOS Scopus РИНЦ ANCAN OpenAlex
Aerobic Selective Oxidation of Glucose to Gluconate Catalyzed by Au/Al2O3 and Au/C: Impact of the Mass-Transfer Processes on the Overall Kinetics
Chemical Engineering Journal. 2013. V.223. P.921-931. DOI: 10.1016/j.cej.2012.11.073 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Sep 4, 2012 |
| Accepted: | Nov 16, 2012 |
| Published online: | Nov 26, 2012 |
| Published print: | May 1, 2013 |
Identifiers:
| Web of science: | WOS:000320631200105 |
| Scopus: | 2-s2.0-84877661177 |
| Elibrary: | 20428007 |
| Chemical Abstracts: | 2013:18682 |
| Chemical Abstracts (print): | 158:605881 |
| OpenAlex: | W2034386938 |