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Electrospun ymn2o5 nanofibers:A highly catalytic activity for No oxidation

Electrospun YMn2O5 nanofibers:A highly catalytic activity fo...

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第二十三届二氧化硫、氮氧化物和颗粒物污染防治技术研讨会

作者： Tong Zhang Hui Li Zhi Yang Fengren Cao Liang Li Haijun Chen Hui Liu Ka Xiong Jie Wu Zhanglian Hong Weichao Wang Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Techno College of Physics Optoelectronics and EnergyCenter for Energy Conversion Materials & Physics(CECMP Dongguan Innovative New Materials Co.Ltd Dongguan 523000China College of material Science and Engineering Shandong University of Science and echnologyQingdao 266 State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang Unive Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Techno

Nanofiber catalysts are potentially promising to be equipped in the lean-burned vehicle exhaust emission system considering its facile synthesis,low-cost,long durability in contrast to the traditionally complicated powder based ***,via electrospinning method,we synthesized ymno nanofibers with various nano-morphologies including nanowire stacked with particles,hollow tubes with and without inside *** morphologies of fibers remained even after hydrothermal aging at 800℃ for 10 hours with 10% Ho stream,while powder-based mullite is sintered.X-ray photoelectron spectrum revealed Mn/Mn ratio 0.589 on the surface of ymno catalyst,resulting in the formation of oxygen *** highest conversion of electrospun mullite fibers at 310℃is ～18% higher than powder-based YMo at 352℃ in the presence of 5% Ho at WHSV= 240,000 ml g *** extracted activation energy from No-to-No conversion curves of YMo nanofiber（61.68 kJ/mol） is slightly lower than that of powder-based mullite（91.45 kJ/mol）,consistent with calculated 68.16 kJ/mol on the fiber YMo surface（121） with a rate-limiting step of the No *** catalytic activity can be attributed to the unit occupy of the eg(d and d) orbitals of Mn-dimer atoms around fermi level based on the combination of the theoretical calculations and DRIFTS spectra ***,after the hash hydrothermal-aging,the highest No oxidation conversion of powder-based mullite is less than 50%,while the fiber maintains a conversion of 62%.Moreover,the fresh YMo fiber maintained superior oxidation stability for 12 hours at its maximum conversion of 66%.This work provides the possibility for mullite oxide fibers to replace powder-based precious metal catalyst coating on monolith converter.

关键词： Electrospinning ymn2o5 nanofibers No oxidation Low-temperature catalysis Density functional theory

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