Precise control of the oriented layered double hydroxide nanosheets growth on graphene oxides leading to efficient catalysts for cascade reactions

Song, Y.-F., Zhang, W., Wang, Z., Zhao, Y. and Miras, H. N. (2019) Precise control of the oriented layered double hydroxide nanosheets growth on graphene oxides leading to efficient catalysts for cascade reactions. ChemCatChem, 11(22), pp. 5466-5474. (doi: 10.1002/cctc.201901208)

Abstract

In recent years, great attention has been paid to cascade reactions, which can improve efficiency and reduce waste production by implementing several consecutive reactions. Herein, two bifunctional catalysts were successfully prepared by precise control of the oriented layered double hydroxides (LDHs) growth on graphene oxides (GO) using a single‐drop and co‐precipitation method, respectively. The resultant Ru/LDH‐GO‐P and Ru/LDH‐GO‐V composites were characterized by EXAFS, FT‐IR, XRD, TG‐DTA, BET, XPS, TEM, CO2‐TPD, O2‐TPD, etc. The catalytic performance of Ru/LDH‐GO‐P and Ru/LDH‐GO‐V for one‐pot oxidation‐Knoevenagel condensation reaction showed significant difference under the same experimental conditions, in which the Ru/LDH‐GO‐P showed 99 % conversion and 99 % selectivity, in marked contrast of 60.7 % conversion and 47.9 % selectivity using Ru/LDH‐GO‐V as catalyst. The large enhancement of the catalytic performance using Ru/LDH‐GO‐P can be attributed to the following reasons: 1) the Co3+ centers in Ru/LDH‐GO‐P can promote the formation of surface oxygen vacancies that can adsorb and activate O2 to get better performance; 2) the Ru/LDH‐GO‐P exhibited larger BET surface and more medium‐strong basic active sites than the Ru/LDH‐GO‐V. Moreover, the Ru/LDH‐GO‐P catalyst can be easily recovered from the reaction system and reused for at least five times without obvious deterioration of its catalytic activity or structural integrity.

• Item Type: Articles
• Additional Information: This research was supported by the National Nature Science Foundation of China (U1707603, 21625101), Beijing Natural Science Foundation (2182047) and the Fundamental Research Funds for the Central Universities (XK1802‐6, XK1902, 12060093063). H.N.M acknowledges the financial support from The University of Glasgow.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Moiras, Professor Haralampos
• Authors: Song, Y.-F., Zhang, W., Wang, Z., Zhao, Y., and Miras, H. N.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: ChemCatChem
• Publisher: Wiley
• ISSN: 1867-3899
• ISSN (Online): 1867-3899
• Published Online: 28 August 2019
• Copyright Holders: Copyright © 2019 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim
• First Published: First published in ChemCatChem 11(22):5466-5474
• Publisher Policy: Reproduced in accordance with the publisher copyright policy