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论文类型：期刊论文

发表时间：2012-05-30

发表刊物：APPLIED CATALYSIS B-ENVIRONMENTAL

收录刊物：EI、SCIE

卷号：119

页面范围：49-55

ISSN号：0926-3373

关键字：Gold catalyst; Deactivation; Plasma regeneration; N-2 content; CO oxidation

摘要：Driven by excellent CO oxidation capability of gold nanocatalysts at room temperature, a TiO2 supported Au nanocatalyst (Au/TiO2) was synthesized by deposition-precipitation method. To solve the deactivation issue of Au/TiO2 catalyst during CO oxidation, in-situ regeneration by N-2/O-2 plasma was employed. Pure O-2 plasma could reversibly regenerate the deactivated Au/TiO2 catalyst, however, N-2 addition resulted in an extra catalyst poisoning during regeneration. The extra poisoning effect was the most severe at 10% N-2 and became much weaker at 80% N-2. To investigate the formation of any surface poisoning species [NOy](s) on Au/TiO2 catalyst, gaseous product of N-2/O-2 plasma over fresh Au/TiO2 catalyst was on-line analyzed by FT-IR, followed by catalyst characterization with temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. The Au/TiO2 catalysts before and after plasma regeneration were also measured by transmission electron microscopy (TEM), in order to exclude the poisoning effect arisen from the change in gold particle size or morphology. (C) 2012 Elsevier B.V. All rights reserved.