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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Preparation and Calcination Temperature...

Preparation and Calcination Temperature Optimization of La_1-xSr_xCo_1-yFe_yO₃ for Removing NO_x Effectively

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Abstract:

The automotive emission has become the main source of the air pollution in cities. How to remove NO_x effectively is the key and difficult point in the control of automobile exhaust. In this work, sol-gel was applied to prepare NO_x purification catalyst, LaCoO₃ which was doped with strontium (Sr) and iron (Fe). The average particle size was less than 25 nm. The optimum composition of doped LaCoO₃ was determined as La_0.8Sr_0.2Co_0.95Fe_0.05O₃ with a minimum particle size, 14.3nm. The denitrification rate of La_0.₈Sr_0.2Co_0.95Fe_0.05O₃ increased by 27.9% compared with that of LaCoO₃. It was noted that the sample powder would agglomerate when doped LaCoO₃ was calcinated at 800°C, the calcination temperature of LaCoO₃. Therefore the calcination temperature for double doped LaCoO₃ was optimized. According to results of XRD and BET, the optimum calcination temperature of La_0.8Sr_0.2Co_0.95Fe_0.05O₃ is 575°C, which not only overcame the agglomeration but also reduced the particle size to 11.2nm. The denitrification rate of La_0.8Sr_0.2Co_0.95Fe_0.05O₃ calcinated at 575°C is up to 95.8% which is higher 38.7% than that of it calcinated at 800 °C.

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Functional Materials Research II

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

369-373

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.369

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Online since:

January 2017

Authors:

Jia Qi Zhang, Ge Gao, Zheng Ma, Zhe Jia Ji Zhu, Hui Ying Chen*

Keywords:

Calcination Temperature Optimization, Denitrification, Double-Doped, Perovskite

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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