| Selective Conversion of Cellobiose and Cellulose into Gluconic Acid in Water in the Presence of Oxygen, Catalyzed by Polyoxometalate-Supported Gold Nanoparticles. | |
| | |
MedLine Citation:
|
PMID: 22298297 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Gold nanoparticles loaded onto Keggin-type insoluble polyoxometalates (Cs(x) H(3-x) PW(12) O(40) ) showed superior catalytic performances for the direct conversion of cellobiose into gluconic acid in water in the presence of O(2) . The selectivity of Au/Cs(x) H(3-x) PW(12) O(40) for gluconic acid was significantly higher than those of Au catalysts loaded onto typical metal oxides (e.g., SiO(2) , Al(2) O(3) , and TiO(2) ), carbon nanotubes, and zeolites (H-ZSM-5 and HY). The acidity of polyoxometalates and the mean-size of the Au nanoparticles were the key factors in the catalytic conversion of cellobiose into gluconic acid. The stronger acidity of polyoxometalates not only favored the conversion of cellobiose but also resulted in higher selectivity of gluconic acid by facilitating desorption and inhibiting its further degradation. On the other hand, the smaller Au nanoparticles accelerated the oxidation of glucose (an intermediate) into gluconic acid, thereby leading to increases both in the conversion of cellobiose and in the selectivity of gluconic acid. The Au/Cs(x) H(3-x) PW(12) O(40) system also catalyzed the conversion of cellulose into gluconic acid with good efficiency, but it could not be used repeatedly owing to the leaching of a H(+) -rich hydrophilic moiety over long-term hydrothermal reactions. We have demonstrated that the combination of H(3) PW(12) O(40) and Au/Cs(3.0) PW(12) O(40) afforded excellent yields of gluconic acid (about 85 %, 418 K, 11 h), and the deactivation of the recovered H(3) PW(12) O(40) -Au/Cs(3.0) PW(12) O(40) catalyst was not serious during repeated use. |
| | |
Authors:
|
Dongli An; Aihua Ye; Weiping Deng; Qinghong Zhang; Ye Wang |
Related Documents
:
|
6117547 - Heterotrophic carbon metabolism by beggiatoa alba. 3136017 - Prokaryotic hopanoids: the biosynthesis of the bacteriohopane skeleton. formation of is... 6274317 - An alternative pathway for the biosynthesis of isoprenoid compounds in bacteria. 9676047 - Production of gluconic acid using micrococcus sp.: optimisation of carbon and nitrogen ... 20834147 - Protease-catalyzed monoacylation of 2-o-α-d-glucopyranosyl-l-ascorbic acid in three so... 19425617 - Efficient synthesis of arrays of amino acid derived ugi products with subsequent amidat... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-2-1 |
Journal Detail:
|
Title: Chemistry (Weinheim an der Bergstrasse, Germany) Volume: - ISSN: 1521-3765 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
|
Created Date: 2012-2-2 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9513783 Medline TA: Chemistry Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
Affiliation:
|
State Key Laboratory of Physical Chemistry of Solid Surfaces and, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers, and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (P. R. China), Fax: (+86) 592-2183047. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Influence of foot orientation on the appearance and quantification of (1) H magnetic resonance muscl...
Next Document: Arylpiperazine Dopamineric Ligands Protect Neuroblastoma Cells from Nitric Oxide (NO)-Induced Mitoch...