Synthesis of high performance diesel oxidation catalyst using novel mesoporous AlLaZrTiOx mixed oxides by a modified sol
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ORIGINAL RESEARCH
Synthesis of high performance diesel oxidation catalyst using novel mesoporous AlLaZrTiOx mixed oxides by a modified sol-gel method Yongwan Gu 1 & Zaifu Pan 1 & Huiying Zhang 2 & Jingfang Zhu 1 & Bingnan Yuan 3,4 & Duo Pan 4,5 & Chunhua Wu 6,7 & Binbin Dong 5 & Zhanhu Guo 4 Received: 22 October 2020 / Revised: 12 November 2020 / Accepted: 14 November 2020 / Published online: 23 November 2020 # Springer Nature Switzerland AG 2020
Abstract High performance diesel oxidation catalyst (DOC) is achieved using novel Al2O3-LaAlO3-ZrO2-TiO2 (AlLaZrTiOx) mixed oxides and has been successfully fabricated by a modified sol-gel method. It is worth noting that novel AlLaZrTiOx mixed oxides own outstanding properties, such as mesoporous structure, high specific surface area, and thermal stability, which are confirmed by N2 adsorption-desorption, TEM, small-angle x-ray diffraction, and XRD spectrum. For these mixed oxides, temperature has a significant effect on their properties, for example, high specific surface area (206.5 m2/g) with a pore volume of 0.5 cc/g can be obtained by calcining at 700 °C for 4 h. Meanwhile, the possible synthesis mechanism of mesoporous AlLaZrTiOx mixed oxides was also discussed. Finally, the catalytic performances of Pt-Pd/AlLaZrTiOx catalyst and commercial catalyst were compared under the same simulated clean diesel combustion. Pt-Pd/AlLaZrTiOx catalyst demonstrated an excellent low temperature oxidation catalytic activity with the conversion of CO and total hydrocarbon (C3H6) reaching 90% at 196 °C and 200 °C, respectively. Specially, the conversion of NO reached 75% when the temperature was at around 200 °C. Keywords Mesoporous AlLaZrTiOx . Sol-gel method . Synthesis mechanism . Diesel oxidation catalyst
1 Introduction With the development of automobile industry, the problem of energy crisis and environmental pollution is becoming more and more obvious [1]. Compared with gasoline engine, diesel engine has higher combustion efficiency, reliability, service life, and lower pollutant emissions [2, 3]. Therefore, the research of
* Huiying Zhang [email protected]
diesel-powered vehicles has attracted extensive attention, and their market share is climbing. Although diesel-powered vehicles have many advantages in energy consumption and environment protection, the exhaust still needs to be further purged such as microparticulate matter (PM), hydrocarbon (HC), CO, NOx, SOF [4]. As is known to all, diesel oxidation catalyst (DOC) is one of the most important
4
Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA
5
Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450001, China
6
School of Chemical Engineering, Southwest Forestry University, Kunming 650224, China
7
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,
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