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| 1 | Effect of different supports on activity of Mn-Ce binary oxides catalysts for toluene combustion显示文摘The effects of support materials on catalytic performance were investigated in catalytic removal of toluene.And the Mn–Ce binary oxides as active components were supported on ZrO_(2),SiO_(2),γ-Al_(2)O_(3) and TiO_(2) support materials.Many techniques,including X-ray diffraction(XRD),Brunauer–Emmett–Teller method(BET),X-ray photoelectron spectroscopy(XPS),temperature-programmed reduction(TPR)and NH_(3)-temperature-programmed desorption(NH_(3)-TPD),were used to characterize physicochemical properties.Among the different catalysts,the MnCe/ZrO_(2) catalyst with the lowest specific surface area(39.7 m^(2)/g)shows the best catalytic activity.In terms of toluene conversion,the activity order is as follows:MnCe/ZrO_(2)>MnCe/TiO_(2)≈MnCe/SiO_(2)>MnCe/Al_(2)O_(3).The better performance of MnCe/ZrO_(2) should be attributed to the low-temperature reducibility,and abundant surface species(Mn^(4+)and lattice oxygen).And XPS and TPR results reveal that more surface abundant Mn and Ce elements generate good interaction in MnCe/ZrO_(2).The weak interaction between metal oxide and support also boosts the dispersion and complete reduction of MnCe oxides at low temperature.In addition,the in-situ DRIFTS results clarify that the carbonate species are main intermediates in MnCe/ZrO_(2) sample during surface reaction process. | Lei Li Liping Song Zhaoyang Fei Wei Chu Xiaofeng Luo Jinlong Yan | 2022 | Journal of Rare Earths2022，40，4： | 1 |
| 2 | Mn-Ce复合金属氧化物催化氧化甲苯性能显示文摘通过等体积浸渍法制备了一系列Mn-Ce/γ-Al_(2)O_(3)催化剂,并考察不同CeO_(2)负载量对MnO_(2)/γ-Al_(2)O_(3)催化剂催化氧化甲苯性能的影响。利用XRD、N_(2)吸脱附曲线、TEM、H_(2)-TPR、XPS和O_(2)-TPD等方法表征催化剂比表面积、表面形貌及氧化还原性能。结果表明,CeO_(2)的负载一定程度上降低了MnO_(2)/γ-Al_(2)O_(3)催化剂的比表面积,且催化剂仍保持介孔结构。CeO_(2)的存在增加了催化剂表面的化学吸附氧含量,其良好的储放氧能力促进了Mn^(3+)向Mn^(4+)的转化;Mn和Ce之间存在较强的协同作用,与MnOx相邻的CeO_(2)更容易打开Ce—O键释放活性氧,加速氧化还原进程,Mn_(0.6)Ce_(0.4)/γ-Al_(2)O_(3)催化剂T_(10)和T_(90)与MnO_(2)/γ-Al_(2)O_(3)催化剂相比分别降低20和40℃。本研究可为VOCs催化氧化技术中低成本金属催化剂的开发提供参考。 | 任思达 潘文 梁文俊 闫贺 赵锦 李劲松 | 2023 | 环境工程学报2023，17，8： | 0 |
| 3 | Effect of calcination process on performance of 3DOM CeMnO3 catalysts显示文摘A series of 3DOM CeMnO3 perovskite catalysts were prepared by poly(methyl methacrylate)hardtemplating-excessive impregnation method at calcination temperature of x℃(x=600,700,800)and the heating rate of y℃/min(y=1,2,5,10).The samples were characterized by Brunauer-Emmett-Teller method,scanning electron microscopy,transmission electron microscopy,H2-temperature programmed reduction,X-ray photoelectron spectroscopy,X-ray diffraction,moreover,the effect of the calcination process on the catalytic activity of the samples were discussed by the catalytic combustion of toluene.The results show that the 3DOM CeMnO3 catalysts calcined at 600℃promote the formation of a perovskite structure,inhibit the reduction of the Mn4+species in the catalyst with high temperature.The catalyst expresses the complete macroporous structure,large specific surface area(38.8 m^(2)/g),higher adsorption oxygen concentration and Mn4+substance concentration,with a low T90%=172℃.By preparing the catalysts at different calcination heating rates,it can be concluded that the catalyst possesses a high concentration of adsorbed oxygen and a low reduction temperature and a large specific surface area(40.42 m^(2)/g)greatly promotes adsorption stage catalytic oxidation reaction and catalytic combustion of toluene at low temperature under the heating rate of 5℃/min.When the heating rate is 1℃/min,the catalyst has a complete macroporous structure(>250 nm),which is beneficial to the exchange of macromolecular substances during the catalytic reaction and the catalyst has a high concentration of lattice oxygen suitable for the catalysis of toluene in high temperature flue gas combustion. | Xin Liu Xinyi Lv Yongqiang Wang Chaocheng Zhao Fang Liu | 2021 | Journal of Rare Earths2021，39，9： | 0 |
| 4 | Continuous generation of lattice oxygen via redox engineering for boosting toluene degradation performances显示文摘Excellent performances promoted by lattice oxygen have attracted wide attention for catalytic degradation of volatile organic compounds(VOCs).However,how to control the continuous regeneration of lattice oxygen from the support is seldom reported.In this study,we selected sepiolite supported manganese-cobalt oxides(Co_(x)Mn_(100-x)O_(y))as model catalysts by tuning Co/(Co+Mn)mass ratio(x=3%,10%,15%,and 20%)to enhance toluene degradation efficiency,owing to lattice oxygen regeneration by redox cycle existing at the interface and Mn species with high valence state,initiated by cobalt catalytic performance under the role of crystal field stability phase.The results of activity test show that the sepiolite-Co_(15)Mn_(85)O_(y)catalyst exhibit outperformances at 193℃with 10,000 h^(-1)GHSV.In addition,the catalyst existed at the bottom of the'volcano'curve correlated T_(50)or T_(90)with Co/(Co+Mn)weight ratio is sepiolite-Co_(15)Mn_(85)O_(y),conforming its outperformance.Further characterized by investigating active sites structural and electronic properties,the essential of superior catalytic activity is attributed to the grands of lattice oxygen continuous formation resulted from redox engineering based on the high atomic ratio of surface lattice oxygen with continuous refilled from the support and that of Mn^(4+)/Mn^(3+)cycle initiated by cobalt catalytic behaviors.All in all,redox engineering,not only promotes grands of active species reversible regeneration,but supplies an alternative catalyst design strategy towards the terrific efficiency-to-cost ratio performance. | Shiya He Zhimin You Xin Jin Yi Wu Cheng Chen He Zhao Jian Shen | 2021 | Chinese Journal of Chemical Engineering2021，34，6： | 0 |
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