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Easy Precipitation Method for Preparation of Cerium Added La2O2SO4 Used for Oxygen Storage

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Abstract:

The present work gives a simple precipitation method for preparation of lanthanum oxysulfate and cerium modified lanthanum oxysulfate by using lanthanum nitrate and ammonium sulfate as precursor in the presence of ammonia. The XRD, TEM, XPS, and N2 sorption measurements have been adopted to characterize those materials. The present work demonstrates that cerium addition can promote the oxidation and reduction process between lanthanum oxysulfide (La2O2S) and lanthanum oxysulfate (La2O2SO4). The cerium doped La2O2SO4/La2O2S oxygen storage system showed the replacement of cerium for some La site to form a stable structure and no sulfur leakage took place in the process of redox cycle. The oxidation temperatures of Ln2O2S to Ln2O2SO4 decrease more than 150 °C for cerium doping samples; and the reduction temperature of La2O2SO4 to La2O2S in hydrogen decreases about 50 °C. The redox cycle between Ce3+ and Ce4+ has been considered response to the promotion of the redox cycle.

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Periodical:

Advanced Materials Research (Volume 886)

Pages:

196-199

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.886.196

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Online since:

January 2014

Authors:

Wei Hua Shen, Shuichi Naito

Keywords:

Ce, Lanthanum Oxysulfate/Oxysulfide, Oxygen Storage, Palladium, Precipitation

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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