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Selective catalytic NO_x reduction on Antimony promoted V_2O_5-Sb/TiO_2 catalyst

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Rare Metals 2006年第z2期25卷 84-88页

作者： HA Heon Phil CHUNG Soon Hyo OH Young Joo Metal Processing Research Center Korea Institute of Science and Technology Cheongryang Seoul 130-650 Republic of Korea

Quantum chemical calculation was carried out to choose a promoter which can reduce the poisoning of V2O5/TiO2 catalysts by SO2. Several atoms were chosen as candidates and new catalysts were synthesized by impregnation method. The NOx conversion rate was measured at temperatures between 100 and 400 ℃ and poisoning effect was investigated. The most promising candidate promoter, Se, was excluded because of its high vapor pressure. On the other hand, Sb shows best promoting properties. Sb promoted catalyst reaches the maximum NOx conversion rate at 250 ℃. It also shows considerably enhanced resistance to poisoning of V2O5/TiO2 catalysts by SO2.

关键词： De NOx selective catalytic reduction SO2 poisoning low temperature activity

Study on Oxidation activity of CuCeZrO_x Doped with K for Diesel Engine Particles in NO/O_2

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Journal of Shanghai Jiaotong university(Science) 2018年第S1期23卷 18-27页

作者： WANG Kexin GUAN Bin LI Ke ZHAN Rijing LIN He HUANG Zhen School of Mechanical Engineering Shanghai Jiao Tong University

CuCeZrO_x and KCuCeZrO_x catalysts were synthesized and coated on the blank diesel particulate filter(DPF)substrate and a particulate matter(PM)loading apparatus was used for soot *** catalytic performances of soot oxidation were evaluated by temperature programmed combustion(TPC)test and characterization tests were conducted to investigate the physicochemical properties of the *** reaction mechanism in the oxidation process was analyzed with diffuse reflectance infrared Fourier transform *** results demonstrated that CuCeZrO_x catalyst exhibited high activities of soot oxidation at low temperature and the best results have been attained with Cu_(0.9)Ce_(0.05)Zr_(0.05)O_x over which the maximum soot oxidation rate decreased to 410~?*** tests have shown that catalysts containing 90%Cu have uniformly distributed grains and small particle sizes,which provide excellent oxidation activity by providing more active sites and forming a good bond between the catalyst and the *** low-temperature oxidation activity of soot could be further optimized due to the excellent elevated NO’s conversion rate by partially substituting Cu with *** maximum particle oxidation rate can be easily realized at such a low temperature as 347~?C.

关键词： self-propagating high-temperature synthesis(SHS) Mn and Ce substitution low temperature activity N2 selectivity H2O and SO2 poisoning in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)

Preparation of Cs-Rb-V series sulphuric acid catalyst

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中国有色金属学会会刊：英文版 2001年第4期11卷 595-598页

作者：陈振兴杨刚叶华 Cent S Univ Coll Chem & Chem Engn Changsha 410083 Peoples R China

Cs Rb V series low temperature sulphuric acid catalyst was prepared for the first time by using carbonized mother liquor containing alkali metal salts. The results show that the conversion of SO 2 on catalyst prepared directly with carbonized mother liquor could reach to 24.8% at 410?℃. If n (Na)/ n (V) was adjusted properly, the conversion of SO 2 could be increased to 35.6% at 410?℃. Refined carbonized mother liquor could make the catalytic activity even higher at low temperature, the conversion of SO 2 could be increased to 36.65% at 410?℃. The catalyst was examined with differential thermal analysis. It was found that both endothermic peaks and exothermic peaks of catalyst shifted forward obviously and the catalyst possessed higher activity at low temperature.

关键词： sulphuric acid catalyst sulphur dioxide alkali metal element low temperature activity promoter

activity Enhancement of Vanadium Catalysts with Ultrasonic Preparation Process for the Oxidation of Sulfur Dioxide

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Journal of Natural Gas Chemistry 2003年第2期12卷 139-144页

作者： Zhenxing Chen, Honggui Li, Lingsen WangState Key Laboratory for Powder Metallurgy, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China State Key Laboratory for Powder Metallurgy College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

The effect of ultrasonic cavitations on the activity of vanadium catalysts atlow temperatures for the oxidation of sulfur dioxide, in which refined carbonized mother liquor hadbeen added, was investigated. Twenty minutes were needed to produce obvious cavitations when thecatalyst raw material was treated in the 50 W ultrasonic generator. However, only 10 minutes wouldbe needed in a 150 W ultrasonic generator. The higher the temperature of the wet material, the lesstime was needed to produce cavitations, and the optimal temperature was 60℃. The water content inthe wet material mainly affected the quantity of cavitations. Ls-8 catalyst was prepared usingultrasonic. Its activity for conversion of SO_2 reached to 52.5% at 410℃ and 4.2% at 350℃. Thedifferential thermal analyses indicate that both endothermic peaks and exothermic peaks noticeablyshifted forward compared with Ls catalyst prepared without ultrasonic, and SEM results show auniform pore size distribution for Ls-8 catalyst.

关键词： ultrasonic dispersion vanadium catalyst low temperature activity sulfurdioxide cavitation