Abstract: Aseries of SnO2-based solid solutions TM-SnO2 (TM=Mn, Fe, Co, Ni) with mesoporous structures were prepared by CTAB-assisted coprecipitation method for catalytic combustion of diesel soot particulates. The solid solutions were characterized by XRD, SEM, N2 adsorption-desorption, Raman spectrum, H2-TPR and FTIR technologies. Their catalytic activity for soot combustion was investigated by temperature programmed oxidation. Doping the SnO2 with small amounts of transition metals could form a stable solid solution with rutile structure. After calcination at 800 ℃ for 6 h, the SnO2-based solid solutions displayed nanospheres with diameter of 20—30 nm and relatively large surface areas of 20—40 m2·g-1, while transition metal doping increased the pore size. A strong interaction between Sn and transition metals occurred in the solid solution, improving the mobility of the surface oxygen and redox properties. The improved oxygen mobility might be derived from the structure defects induced by transition metals doping, which could be helpful in oxidation reactions. In comparison with uncatalyzed reactions, the SnO2 catalyst exhibited moderate catalytic activity for soot combustion, while the SnO2-based solid solutions doped with transition metals displayed enhanced activity and selectivity, together with increased soot combustion rates. The improved catalytic performance may be related to their enhanced the reducibility, increased surface oxygen vacancies and improved pore structure. The MnSn catalyst possessed the highest performance with the ignition temperature (T10) of 320 ℃, the semi-conversion temperature (T50) of 375 ℃, and the selectivity to CO2 formation of above 96%. Furthermore, the presence of NO in the reaction atmosphere promoted soot combustion over SnO2-based solid solutions, which follows the NO2-assisted mechanism.
1 Zhu J. Journal of Chongqing University of Technology (Natural Science), 2010, 24(12), 118(in Chinese). 朱江. 重庆理工大学学报(自然科学), 2010, 24(12), 118. 2 Zhai B Y, Liu Q, Pan X. Materials Reports, 2011, 25(Z2), 418(in Chinese). 翟步英, 刘奇, 潘雄. 材料导报, 2011, 25(Z2), 418. 3 Wu X D, Weng D, Chen H P, et al. Materials Reports, 2002(6), 28(in Chinese). 吴晓东, 翁端, 陈华鹏, 等. 材料导报, 2002(6), 28. 4 Oi-Uchisawa J, Wang S D, Nanba T, et al. Applied Catalysis B: Environmental, 2003, 44(3), 207. 5 Uner D, Demirkol M K, Dernaika B. Applied Catalysis B: Environmental, 2005, 61(3-4), 334. 6 Wagloehner S, Noski M N, Kureti S. Chemical Engineering Journal, 2015, 259, 492. 7 Venkataswamy P, Jampaiah D, Rao K N, et al. Applied Catalysis A: General, 2014, 488, 1. 8 Castoldi L, Matarrese R, Lietti L, et al. Applied Catalysis B: Environmental, 2009, 90(1), 278. 9 Kimura R, Elangovan S P, Ogura M, et al. The Journal of Physical Chemistry C, 2011, 115(30), 14892. 10 Liu S, Wu X D, Weng D, et al. Journal of Rare Earths, 2015, 33(6), 567. 11 Neyertz C A, Banús E D, Querini E E M. Chemical Engineering Journal, 2014, 248, 394. 12 Oi-Uchisawa J, Obuchi A, Enomoto R, et al. Applied Catalysis B: Environmental, 2001, 32(4), 257. 13 Peng C, Yu D, Wang L, et al. Scientia Sinica Chimica, 2021, 51(8), 1029(in Chinese). 彭超, 于迪, 王斓懿, 等. 中国科学:化学, 2021, 51(8), 1029. 14 Wang Y, Lee J Y, Zeng H C. Chemistry of Materials, 2005, 17(15), 3899. 15 Li Z H, Li W L, Kong F H, et al. Chemical Industry and Engineering Progress, 2010, 29(12), 2324(in Chinese). 李振昊, 李文乐, 孔繁华,等. 化工进展, 2010, 29(12), 2324. 16 Batzill M, Diebold U. Progress in Surface Science, 2005, 79(2-4), 47. 17 Croft G, Fuller M J. Nature, 1977, 269, 585. 18 Shimizu K, Katagiri M, Satokawa S, et al. Applied Catalysis B: Environmental, 2011, 108-109, 39. 19 Inomata Y, Albrecht K, Yamanmoto K. ACS Catalysis,2018,8(1),451. 20 Liu Z, Feng X, Zhou Z Z, et al. Applied Surface Science, 2018, 428, 526. 21 Bai X, Chai S, Liu C, et al. ChemCatChem, 2017, 9(16), 3226 22 Xu X, Sun X, Han H, et al. Applied Surface Science, 2015, 355, 1254. 23 Lan F, Wang X, Xu X L, et al. Reaction Kinetics Mechanism and Catalysis, 2012, 106(1), 113. 24 Sun Q, Xu X L, Peng H G, et al. Chinese Journal of Catalysis, 2016, 37(8), 1293. 25 Peng Y, Peng H, Liu W M, et al. RSC Advances, 2015, 5(53), 42789. 26 Rao C, Liu R, Feng X H, et al. Chinese Journal of Catalysis, 2018, 39(10), 1683. 27 Sun X M, Chen X, Deng Z X, et al. Materials Chemistry and Physics, 2003, 78(1), 99. 28 Zhu H J, Xu J, Yi C, et al. Journal of Colloid & Interface Science, 2017, 508, 1. 29 Fujihara S, Maeda T, Ohgi H, et al. Langmuir, 2004, 20(15), 6476. 30 Lin G M, Yang H, Zhou Q F, et al. Chinese Journal of Sensors and Actuators, 1996, 9(1), 50(in Chinese). 林光明, 杨华, 周岐发, 等. 传感技术学报, 1996, 9(1), 50. 31 Wu H L, Guo J, Yin X G, et al. Materials Reports B: Research Papers, 2016, 30(4), 72(in Chinese). 邬红龙,郭军,尹晓刚,等. 材料导报:研究篇, 2016, 30(4), 72. 32 Rao C, Shen J, Wang F, et al. Applied Surface Science,2018,435,406. 33 Yu K N, Xiong Y, Liu Y, et al. Physical Review B, 1997, 55(4), 2666. 34 Rao C, Liu R, Feng X H, et al. Chinese Journal of Catalysis, 2018, 39(10), 1683. 35 Zhao J, Zhao J G, Gao S, et al. Chinese Journal of Light Scattering, 2004, 16(3), 234(in Chinese). 赵杰, 赵经贵, 高山,等. 光散射学报, 2004, 16(3), 234. 36 Li X F, Sun Y Q, Wang Z P, et al. Environmental Science, 2017, 38(4), 1348(in Chinese). 李曦峰, 孙宇琦, 王仲鹏,等. 环境科学, 2017, 38(4), 1348. 37 Oviedo J, Gillan M J. Surface Science, 2001, 490(3), 221. 38 Sasikala R, Gupta N M, Kulshrestha S K. Catalysis Letters, 2001, 71(1-2), 69. 39 Wang X, Xiao L H, Peng H G, et al. Journal of Material Chemistry A, 2014, 2, 5616. 40 Shen J, Feng X H, Liu R, et al. Chinese Journal of Catalysis, 2019, 40(6), 905. 41 Li Y R, Peng H, Xu X L, et al. RSC Advances, 2015, 5(33), 25755. 42 Li Z Q, Meng M, Zha Y Q, et al. Applied Catalysis B: Environmental, 2012, 121(23), 65.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2022, Vol. 36 
