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Received January 28, 2021
Accepted April 11, 2021
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The catalytic activity of Ce-Hf, Ce-Hf-Mg mixed oxides and RuO2/HfO2 deposited on CeO2: Role of superoxide/peroxide in soot oxidation reaction
Hari Prasad Uppara
Sunit Kumar Singh1
Nitin Kumar Labhsetwar1
Mudiyaru Subrahmanya Murari2
Harshini Dasari†
Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, India 1Energy and Resource Management Division, CSIR-National Environmental Engineering Research Institute, Nagpur, 440 020, Maharashtra, India 2DST-PURSE Program, Mangalore University, Mangalagangotri-574199, India
harshini.dasari@manipal.edu
Korean Journal of Chemical Engineering, July 2021, 38(7), 1403-1415(13), 10.1007/s11814-021-0805-5
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Abstract
The synthesis of binary mixed oxide Ce-Hf (CH), ternary mixed oxide Ce-Hf-Ru (CHR), and Ce-Hf-Mg (CHM) has been attempted using the PVP-assisted sol-gel method. The structural and surface morphology of the prepared catalysts were investigated and studied for the generation of superoxides (O2 )/peroxides (O2 2) species and availability of lattice oxygen (O) during soot oxidation reactions. The successfully incorporated Hf4+/Mg2+ into ceria (CH, CHM) enhances the redox potential sites on nano-flake morphology, thus produces more oxygen vacancies (□). However, Ru4+/Hf4+ was not doped into the ceria structure in CHR catalyst; it showed lesser structural distortions generating fewer oxygen vacancies. In addition, it was observed that better performing catalysts should possess lower oxidation temperature and be catalytically stable. Indeed, the ternary oxide CHR featured excellent catalytic properties when compared with the others. However, CHM was found structurally and catalytically stable with self-regenerative capability even after the repeated soot oxidation experiments. Thus, the possible soot oxidation mechanism has been proposed on the prepared catalysts.
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Vinodkumar T, Rao BG, Reddy BM, Catal. Today, 253, 57 (2015)
Morales M, Int. J. Green Technol., 3, 51 (2018)
Zhu HJ, Xu J, Yichuan YG, Wang ZP, Gao YB, Liu W, Yin HN, J. Colloid Interface Sci., 508, 1 (2017)
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Dai QG, Bai SX, Wang ZY, Wang XY, Lu GZ, Appl. Catal. B: Environ., 126, 64 (2012)
He JL, Fang WH, Long R, Prezhdo OV, J. Am. Chem. Soc., 141(14), 5798 (2019)
