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The Scientific World Journal
Volume 2015 (2015), Article ID 254165, 8 pages
http://dx.doi.org/10.1155/2015/254165
Research Article

Hydrothermal Synthesis of Lanthanide Stannates Pyrochlore Nanocrystals for Catalytic Combustion of Soot Particulates

School of Resources and Environment, University of Jinan, 336 Nanxinzhuangxi Road, Jinan 250022, China

Received 2 November 2014; Revised 16 February 2015; Accepted 3 March 2015

Academic Editor: Siang-Piao Chai

Copyright © 2015 Xiaomin Zhang 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

Nanocrystalline La2Sn2O7 and La2Sn1.8Co0.2O7 with a phase-pure pyrochlore structure were synthesized by a hydrothermal method, and their catalytic activity was investigated for soot combustion. The as-synthesized catalysts presented relatively larger surface area, and pore volume, which was benefit to the gas molecule diffusion in the reaction. A uniform spherical structure with particle size of 200–500 nm was found in SEM. The samples via hydrothermal route are more active for catalytic soot combustion, ascribing to the spherical morphology, high surface area and improved oxygen mobility. After Co, the reducibility was improved and surface oxygen vacancy was produced, resulting in the enhanced activity and selectivity to CO2 formation.