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Ultrasound–Calcination Synergistic Control of (Ce, La)PO4 Catalyst Structure for Enhanced Low‐Temperature NH3‐SCR Performance.

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Title: Ultrasound–Calcination Synergistic Control of (Ce, La)PO4 Catalyst Structure for Enhanced Low‐Temperature NH3‐SCR Performance.
Authors: Li, Na1 (AUTHOR) nkdlina@126.com, Yan, Kai1 (AUTHOR), Tan, Shuning1 (AUTHOR), Wang, Ruifang1 (AUTHOR), Zhang, Zhiyu1 (AUTHOR)
Source: Asia-Pacific Journal of Chemical Engineering. May2026, Vol. 21 Issue 3, p1-14. 14p.
Subjects: Catalyst structure, Catalytic reduction, Ultrasonic waves, Acid catalysts, Oxidation-reduction reaction, Denitrification, Catalysts
Abstract: In this study, (Ce, La)PO4 catalysts were synthesized via an ultrasound‐assisted method. The effects of ultrasound duration and calcination temperature on the low‐temperature NH3‐SCR performance were systematically investigated. The results indicated that the (Ce, La)PO4 catalyst prepared with an ultrasound treatment time of 20 min and a calcination temperature of 400°C exhibited optimal denitrification efficiency, achieving a NOx conversion rate of 95.4% at 250°C. Characterization results revealed that under appropriate ultrasonic treatment and calcination conditions, the catalyst's pore structure and redox properties were significantly improved: The specific surface area reached 38.1105 m2/g, the total pore volume increased to 0.36616 cm3/g, and the average pore size expanded to 19.2 nm. Moreover, the catalyst surface exposed more Lewis and Brønsted acid sites, which enhanced the adsorption and desorption capacity of NH3. The presence of active intermediates such as –NH2, monodentate nitrite, and bidentate nitrite was identified, contributing to a notable improvement in the low‐temperature redox performance of the catalyst. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this study, (Ce, La)PO4 catalysts were synthesized via an ultrasound‐assisted method. The effects of ultrasound duration and calcination temperature on the low‐temperature NH3‐SCR performance were systematically investigated. The results indicated that the (Ce, La)PO4 catalyst prepared with an ultrasound treatment time of 20 min and a calcination temperature of 400°C exhibited optimal denitrification efficiency, achieving a NOx conversion rate of 95.4% at 250°C. Characterization results revealed that under appropriate ultrasonic treatment and calcination conditions, the catalyst's pore structure and redox properties were significantly improved: The specific surface area reached 38.1105 m2/g, the total pore volume increased to 0.36616 cm3/g, and the average pore size expanded to 19.2 nm. Moreover, the catalyst surface exposed more Lewis and Brønsted acid sites, which enhanced the adsorption and desorption capacity of NH3. The presence of active intermediates such as –NH2, monodentate nitrite, and bidentate nitrite was identified, contributing to a notable improvement in the low‐temperature redox performance of the catalyst. [ABSTRACT FROM AUTHOR]
ISSN:19322135
DOI:10.1002/apj.70220