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An assessment of how distance and diesel oxidation catalyst will impact thermal decomposition behaviors of particles

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Journal of Environmental Sciences 2020年第4期32卷 157-169页

作者： Mengzhu Zhang Yunshan Ge Chuanzhen Zhang Xin Wang National Laboratory of Auto Performance and Emission Test Beijing Institute of TechnologyBeijing100081China Baic Motor Corporation LTD. Beijing101300China

Decomposition mass loss and pyrolysis products analyses of particles sampled at various locations along the tailpipe of a Euro-IV diesel engine were performed using a thermo gravimetry in conjunction with Fourier transformation infrared spectrometrymass spectrum.diesel particles were collected at the same location with and without diesel oxidation catalyst(DOC)mounted on the test engine separately.The three poles in thermal gravity-differential thermal gravity images suggested that the decomposition process of diesel particles could be divided into three stages which correspond to the decompositions of lower boiling substances,higher boiling substances and soot respectively.It is noticed that no matter whether DOC was mounted or not,the further the particles were sampled away from the engine block,the lower the peak temperatures and the heavier the mass losses within the first two stages,which indicated that the soluble organic fraction in the particle samples increased and therefore lowering the activation energy of thermal decomposition.Hydroxyl,ammonia,C_xH_y fragments,benzene,toluene,and phenol were found to be the primary products of particle decomposition,which didn’t change with the location of particle sample point.The employment of DOC increased the activation energy for particle oxidation and resulted in a higher peak temperature and lower mass loss within the first-stage.Moreover,the C=O stretching bands of aldehyde and ketone at 1771 cm-1 was only detected without a DOC,while the N02 peak at 1634 cm-1 was solely noticed with the presence of DOC.Compared to the first-stage pyrolysis products,more polycyclic aromatic hydrocarbons and less C_xH_y fragments were seen in the second-stage.

关键词： Transport distance diesel oxidation catalyst Thermal decomposition Pyrolysis products Particle

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Preparation of M/Ce_(1-x)Ti_(x)O_(2)(M=Pt,Rh,Ru)from sol-gel method and their catalytic oxidation activity for diesel Soot

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Journal of Rare Earths 2022年第12期40卷 1849-1859,I0002页

作者： Bing Zhao Wenlin Chen Yifeng Tan Fan Li Mengkui Tian College of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China

A series of Ce_(1-x)Ti_(x)O_(2)mixed oxide catalysts were synthesized by sol-gel method and then loading of noble metal(M=Pt,Rh,Ru)was used for soot oxidation.Ti-doped Ce_(1-x)Ti_(x)O_(2)catalysts(x is the molar ratio of Ti/(Ti+Ce)and ranges from 0.1 to 0.5)exhibit much better oxidation performance than CeO_(2)catalyst,and the Ce_(0.9)Ti_(0.1)O_(2)catalyst calcined at 500℃has the best catalysis activity.Each noble metal(1 wt%)was supported on Ce_(0.9)Ti_(0.1)O_(2)(M/C9 T1)and the properties of the catalysts were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Raman,Brunauer-Emmett-Teller(BET)method,and H_(2)-temperature programmed reduction(H_(2)-TPR)results.Results show that the introduction of Ti into CeO_(2)forming Ti-O-Ce structure enhances the catalytic activity and increases the number of oxygen vacancies at the catalyst surface.The noble metal is highly dispersed over Ce_(0.9)Ti_(0.1)O_(2),and M/C9 T1 catalysts present enhanced activity in comparison to Ce_(0.9)Ti_(0.1)O_(2).It is found that noble metals can greatly increase the activity of the catalyst and the corresponding oxidation rate of soot can enhance the electron transfer capacity and oxygen adsorption capacity of the catalyst.A small amount of Ti doping in CeO_(2)can significantly improve the activity of the catalyst,while a large amount of Ti reduces the performance of the catalyst because a large amount of Ti is enriched on the surface of the catalyst,which hinders the contact and reaction between the catalyst and the soot.

关键词： diesel oxidation catalyst Soot oxidation Ce-Ti oxides Rare earths

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Experimental study on filtration and continuous regeneration of a particulate filter system for heavy-duty diesel engines

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Journal of Environmental Sciences 2014年第12期26卷 2434-2439页

作者： Tao Tang Jun Zhang Dongxiao Cao Shijin Shuai Yanguang Zhao State Key Laboratory of Automotive Safety and Energy Tsinghua University

This study investigated the filtration and continuous regeneration of a particulate filter system on an engine test bench, consisting of a diesel oxidation catalyst（DOC） and a catalyzed diesel particulate filter（CDPF）. Both the DOC and the CDPF led to a high conversion of NO to NO2 for continuous regeneration. The filtration efficiency on solid particle number（SPN） was close to100%. The post-CDPF particles were mainly in accumulation mode. The downstream SPN was sensitively influenced by the variation of the soot loading. This phenomenon provides a method for determining the balance point temperature by measuring the trend of SPN concentration.

关键词： Catalyzed diesel particulate filter diesel oxidation catalyst Filtration Regeneration Balance point temperature

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Improved sulfur-resistant ability on CO oxidation of Pd/Ce＿(0.75)Zr＿(0.25)O＿2 over Pd/CeO_2-TiO_2 and Pd/CeO_2

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Journal of Rare Earths 2015年第1期33卷 56-61页

作者：沈美庆林放魏光曦王建强朱少春 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering & Technology Tianjin University State Key Laboratory of Engines Tianjin University Collaborative Innovation Center of Chemical Science and Engineering

The influence of sulfation on Pd/Ce0.75Zr0.25O2, Pd/Ce O2-Ti O2 and Pd/Ce O2 was investigated. Physical structure and chemical properties of different catalysts were characterized by N2 adsorption, X-ray diffraction（XRD）, CO chemisorption, X-ray photoelectron spectroscopy（XPS）, Fourier transform infrared spectroscopy（FT-IR） and X-ray fluorescence（XRF）. After 10 h SO2 sulfation, it was found that the decrement on CO oxidation catalytic activity was limited on Pd/Ce0.75Zr0.25O2 compared to Pd/Ce O2-Ti O2 and Pd/Ce O2. It demonstrated that Pd/Ce0.75Zr0.25O2 was more sulfur resistant compared to the other two catalysts. After sulfur exposure, catalyst texture was not much influenced as shown by N2 adsorption and XRD, and surface Pd atoms were poisoned indicated by CO chemisorption results. Pd/Ce0.75Zr0.25O2 and Pd/Ce O2-Ti O2 exhibited less sulfur accumulation compared to Pd/Ce O2 in the sulfation process. Furthermore, XPS results clarified that surface sulfur amount, especially surface sulfates amount on the sulfated catalysts was more crucial for the deactivation in sulfur containing environment.

关键词： Pd/Ce0.75Zr0.25O2 Pd/CeO2-TiO2 diesel oxidation catalyst SO2 poison XPS rare earths

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铂基催化剂用于柴油烃氧化(英文)

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催化学报 2011年第5期32卷 777-781页

作者： Masaaki HANEDA Motoi SASAKI Hideaki HAMADA Masakuni OZAWA Ceramics Research Laboratory Nagoya Institute of Technology Research Center for New Fuels and Vehicle Technology National Institute of Advanced Industrial Science and Technology(AIST)

The catalytic performance of Pt-based catalysts for the total oxidation of hydrocarbons was investigated.The activity of supported Pt catalysts(Pt/Al2O3,Pt/ZrO2,Pt/TiO2,and Pt/H-ZSM-5)depends on the metal oxide support.Pt/Al2O3 showed the highest catalytic activity when the catalysts were aged at 750°C for 50 h in air.The activity of Pt/Al2O3 was dependent on the valence state of the Pt surface.Pt/Al2O3 with the Pt surface in the metallic state was more active than with the surface in the cationic state.The surface density of acid and basic sites on the Al2O3 support controlled the valence state of the Pt surface and stability of the Pt particles in the highly dispersed state,respectively.

关键词： diesel oxidation catalyst platinum alumina valence state of platinum surface surface acid-base property

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Application of Rare Earth Oxides in diesel Exhaust Purification catalysts

Application of Rare Earth Oxides in Diesel Exhaust Purificat...

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2004国际稀土研究与应用研讨会（包头）

作者：张昭良于鹏飞王士龙李春凤戴华 College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China College of Chemistry and Chemical Engineering Jinan University Jinan 250022 China Hainan Liuhe Enviromental Protection catalysts Co. Ltd. Jinpan Industrial Development Zone Haikou 570216 China

＜正＞ diesel oxide catalysts and soot combustion catalysts were reported in this paper. The former was manufactured in mass last year, and enhanced performance is under development now. The later is screened out and further research is under way. The best soot combustion catalyst could ignite soot combustion even at 350 ℃, which is within the range of temperatures reached in diesel exhaust, and shows the catalytic combustion velocity nearly one time faster compared with non-catalytic combustion of soot, which is of benefit to rapid regeneration of diesel particulate filter, thus it might be an excellent practicable catalyst.

关键词： diesel oxidation catalyst soot combustion catalyst perovskite rare earths

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