The catalytic activities and thermal stabilities of Li/Na/K carbonates for diesel soot oxidation |
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| Affiliation: | 1. College of Materials and Environmental Science, Qingdao University of Science and Technology, 53 Zheng-Zhou Road, Qingdao 266042, China;2. Key Laboratory of Rubber and Plastics, Ministry of Education, Qingdao University of Science and Technology, 53 Zheng-Zhou Road, Qingdao 266042, China;1. Université de Poitiers, CNRS UMR7285, Institut de Chimie des Milieux et Matériaux de Poitiers, B27, TSA 51106, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France;2. Instituto de Investigaciones en Catálisis y Petroquímica (INCAPE) (FIQ-UNL, CONICET), Colectora Ruta Nac. N° 168 Km. 0, Paraje El Pozo, CP 3000 Santa Fe, Argentina;1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, People''s Republic of China;2. The State Key Lab of High Performance Ceramics and Superfinemicrostructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, People''s Republic of China;1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;2. The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. Haier Group Technique R&D Center, Qingdao 266100, China |
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| Abstract: | The alkali carbonates displayed a good catalytic activity for soot oxidation and their catalytic performances follow the order K2CO3 > Na2CO3 > Li2CO3 with soot ignition onset temperatures (IOTs) of 310 °C, 320 °C and 320 °C respectively. Na/K and Li/Na/K carbonate catalysts produced by combinations of the three alkali carbonates displayed the lowest IOT of about 320 °C that was higher than that of pure K2CO3. It was found that the variation of Li:Na:K molar ratios has very limited effect on the catalytic activity, but considerable effect on the thermal stability of the catalysts.Thermal treatment at 700 °C caused a limited change of IOT, but the deterioration of catalytic performance. In the Li/Na/K catalyst system, the formation of crystalline phases with low melting temperature was observed. |
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