Ye Daiqi

Catalytic performance of a novel ceramic-supported vanadium oxide catalyst for NO reduction with NH3

Abstract A novel TiO2/Al2O3/cordierite honeycomb-supported V2O5–MoO3–WO3 monolithic catalyst was studied for the selective reduction of NO with NH3. The effects of reaction temperature, space velocity, NH3/NO ratio and oxygen content on SCR activity were evaluated. Two other V2O5–MoO3–WO3 monolithic catalysts supported on Al2O3/cordierite honeycomb or TiO2/cordierite honeycomb support, two types of pellet catalysts supported on TiO2/Al2O3 or Al2O3, as well as three types of pellet catalysts V2O5–MoO3–WO3–Al2O3 and V2O5–MoO3–WO3–TiO2 were tested for comparison. The experiment results show that this catalyst has a higher catalytic activity for SCR with comparison to others. The results of characterization show, the preparation method of this catalyst can give rise to a higher BET surface area and pore volume, which is strongly related with the highly active performance of this catalyst. At the same time, the function of the combined carrier of TiO2/Al2O3 cannot be excluded.

Catalytic Decomposition of Toluene Using Various Dielectric Barrier Discharge Reactors

Decomposition of toluene was experimentally investigated with various dielectric barrier discharge (DBD) reactors, such as wire-cylinder, wire-plate and plate-to-plate, combined with multi-metal oxides catalyst (Mn-Ni-Co-Cu-Ox/Al2O3) loaded on the cordierite honeycomb and nickel foam, respectively. The effects of some factors including the residence time, reactor configuration and catalyst, upon the toluene destruction were studied. Results revealed that the use of in-plasma catalysis was more helpful to enhancing the DRE (destruction and removal efficiency) and reducing the O3 formation than that of either post-plasma catalysis or plasma alone. It was demonstrated that the wire-plate reactor was favorable for the oxidation reaction of toluene and the nickel foam-supported catalysts exhibited good activity.

脉冲介质阻挡放电下MnO x -CeO 2 催化氧化碳烟的关键表面物种研究

采用柠檬酸络合法制备了Mn/（Mn+Ce）原子比为0.4的MnO x -CeO 2 复合氧化物，使其分别在有和无脉冲介质阻挡放电条件下，多次催化氧化碳烟.采用XRD、BET、Raman和XPS对新制备未反应过的和各次反应后的MnO x -CeO 2 进行表征.结果发现，在初次反应中，脉冲介质阻挡放电对反应具有强化作用，使MnO x -CeO 2 具备更好的活性.在放电和无放电2种条件下，催化剂第2次反应的活性均较第1次有所降低，且放电条件下降幅更大，而在第3次反应时催化剂活性在两种条件下均保持稳定状态.以上现象原因为，初次反应，两种条件下高温使MnO x -CeO 2 中Mn-Ce-O固溶体发生相分离，部分Mn析出生成了Mn 3 O 4 ；未引入放电时催化剂表面发生不可逆还原的Mn 4+ 量更少，且拥有更多Ce 3+ 并产生了本征氧空位及更多的表面氧；放电的引入，加剧了初次反应时MnO x -CeO 2 表面Mn 4+ 向Mn 3+ 和Mn 2+ 的转化，使其具备更高的活性，但也抑制了Mn 4+ 的恢复，降低了催化剂的活性.在随后的反应中，有无放电催化剂均保持了稳定.脉冲介质阻挡放电对MnO x -CeO 2 反应的关键因素Mn 4+ 、本征氧空位和表面氧产生了重要影响，这种影响在初次反应时并不可逆，进而减弱了放电对反应的强化作用，该现象不可忽视，值得进一步研究.

Electrogenerative Oxidation of Ethanol on Platinized-Carbon Electrodes

High performance platinized-carbon electrodes are developed for utilization in electrogenerative process. Load current density as high as 600 mA per square centimeter can be achieved for oxygen reducing in 6N sulfuric acid with a good stability. With these electrodes and sulfuric acid electrolyte in electrogenerative cell, ethanol vapor carried by nitrogen gas can be selectively oxidized to give acetaldehyde. Selectivity of acetaldehyde depends on potential of the cell and the feed rate of ethanol vapor and it can be more than 80% in optimized conditions. The initial product of ethanol oxidized on platinized-carbon electrode is acetaldehyde.