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Journal of Nanomaterials
Volume 2012 (2012), Article ID 610410, 8 pages
http://dx.doi.org/10.1155/2012/610410
Research Article

Porous Diatomite-Immobilized Cu–Ni Bimetallic Nanocatalysts for Direct Synthesis of Dimethyl Carbonate

1State Key Laboratory of Optoelectronic Materials and Technologies and The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, Sun Yat-Sen University, Guangzhou 510275, China
2Department of Chemistry and Medicinal Chemistry Program, Office of Life Sciences, National University of Singapore, 3 Science Drive 3, Singapore 117543

Received 23 March 2011; Revised 18 July 2011; Accepted 17 August 2011

Academic Editor: Mohammad Reza Bayati

Copyright © 2012 Yong Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A series of diatomite-immobilized Cu–Ni bimetallic nanocatalysts was prepared under ultrasonication and evaluated for the direct synthesis of dimethyl carbonate under various conditions. Upon being fully characterized by TPR, TPD, BET, SEM, XRD, and XPS methodologies, it is found that the bimetallic composite is effectively alloyed and well immobilized inside or outside the pore of diatomite. Under the optimal conditions of 1.2 MPa and 120C, the prepared catalyst with loading of 15% exhibited the highest methanol conversion of 6.50% with DMC selectivity of 91.2% as well as more than 10-hour lifetime. The possible reaction mechanism was proposed and discussed in detail. To our knowledge, this is the first report to use diatomite as a catalyst support for direct DMC synthesis from methanol and CO2.