PrOx nanoparticles: active and stable catalysts for soot combustion
2021
Sellers Antón, Begoña | Bailón-García, Esther | Davó-Quiñonero, Arantxa | Lozano-Castello, Dolores | Bueno López, Agustín | Bueno López, Agustín | Davó-Quiñonero, Arantxa | Lozano-Castello, Dolores | Universidad de Alicante. Departamento de Química Inorgánica | Materiales Carbonosos y Medio Ambiente
PrOx nanoparticles (10nm; 81m2/g) were synthesized and analysed as soot combustion catalyst in comparation with other reference materials including CeO2 nanoparticles and PrOx and CeO2 catalysts with three dimensionally ordered (3DOM) and without controlled structure. PrOx nanoparticles reached the highest activity; T50 decreases from 603 °C (uncatalysed combustion) to 494 °C. This high activity can be attributed to the high surface area/low crystal size, which enhances the soot catalyst contact, and to the improved reducibility. PrOx nanoparticles kept high activity (T50 = 520 °C) after aging at 800 °C, being significantly more active than aged PrOx catalysts with 3DOM and uncontrolled structure and also significantly more active than all aged CeO2 catalysis which suffer almost total deactivation upon aging. In all cases, PrOx catalysts are more active than CeO2 counterpart materials with the same structure and thermal history, and this applies to nanoparticles, 3DOM and uncontrolled structures.
Mostrar más [+] Menos [-]The authors thank the financial support of the Spanish Ministry of Economy and Competitiveness (Project CTQ2015-67597-C2-2-R), Ministry of Science, Innovation and Universities (Project PID2019-105960RB-C22), Generalitat Valenciana (Project PROMETEO/2018/076 and grant APOSTD/2019/030), Junta de Andalucía (Project P18-RTJ-2974), University of Alicante (Project GRE18-01A) and the UE (FEDER funding).
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