超声波制备TiO2光催化降解气相苯的研究

文章以钛酸四丁酯为原料,采用超声波分散450℃焙烧物得到了纳米TiO2光催化剂,以苯为模拟气体,在静态反应装置中考察了该催化剂对气相苯的光催化降解性能。结果表明,采用超声波制备的TiO2光催化剂能显著提高对苯的光催化降解性能,超声波制备的TiO2上苯转化率是搅拌制备的TiO2的1.7倍。BET结果显示超声波制备的光催化剂比表面比搅拌制备的光催化剂高;XRD表征结果表明TiO2呈锐钛型;紫外-可见漫反射结果显示超声波制备的TiO2在可见区吸收增强。     

二炼钢转炉挡渣球车的研制

挡渣出钢法是提高钢水质量的一项有效措施,针对二炼钢转炉生产的实际情况,研制成功挡渣球车,用在出钢后期加入挡渣球。实用结果表明:该车设计合理,运行可靠,有利于改善钢水质量。     

TiO_2光催化降解吡啶的研究

以钛酸四丁酯水解法制备TiO2,采用溶胶-凝胶法在膨胀珍珠岩上负载TiO2,在UV-TiO2体系中对水中吡啶进行光催化降解,结果表明:TiO2加入量为1.25mg/mL,吡啶的光催化降解符合一级动力学方程,加入0.2%H2O2可明显加快吡啶的降解速度,吡啶中氮转化为氨氮,珍珠岩负载型TiO2与粉末TiO2具有相同的催化效能,且便于回收和重复使用。     

Monolithic Catalysts with Low Noble-Metal Content for Exhaust Purification of Small Gasoline Engines

A series of low noble-metal coment monolithic catalysts for exhaust purification of small gasoline engines was investigated, and it was found that the Pt/Rh-OSM/Al2O3 （where OSM was oxygen storage material） catalyst with Ce0.5Zr0.5-MnOx（3%MnOx） OSM held low light-off temperature for CO, HC, and NO; quite wide three-way window, and outstanding thermal stability. The catalyst could efficiently comrol exhaust emission of small gasoline engines.     

Catalytic Partial Oxidation of Methane over Ni/CeO2-ZrO2-Al2O3

Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron spectroscopy（XPS）.Through the test of catalytic partial oxidation of methane（CPOM）,Ni/CeO2-ZrO2-Al2O3 displayed the highest activity,which resulted from its largest BET area and best NiO dispersion.Furthermore,Ni/CeO2-ZrO2-Al2O3 maintained a long-time stability in CPOM,which was attributed to its best coking resistance among all the prepared catalysts.     

沉淀法制备纳米ZnO及光催化甲基橙脱色研究

以Zn(NO3)2·6H2O为锌源,(NH4)2CO3和NH3·H2O混合碱为沉淀剂,通过并流沉淀法制备出纳米ZnO粉体,采用XRD和SEM对其进行了表征。以甲基橙为脱色对象,紫外灯(最大吸收波长254nm)为光源,研究了催化剂用量、甲基橙初始浓度、pH值及外加氧化剂(H2O2)对光催化性能的影响。     

Effect of metal doping into Ce0.5Zr0.5O2 on catalytic activity of MnOx/Ce0.5–xZr0.5–xM0.2xOy/Al2O3 for benzene combustion

The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction （XRD）, surface area analysis, oxygen storage capacity （OSC）, and H2-temperature programmed reduction （H2-TPR）. Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application.     

Ag-TiO2复合膜的制备及光催化性能

以载玻片为载体,用溶胶-凝胶法制备了含银量为1．0％的Ag—TiO2复合膜,并且考察了复合膜光催化脱色甲基橙溶液的催化性能。结果表明：复合膜焙烧温度为450℃时催化活性最好,TiO2呈锐钛型,Ag—TiO2复合膜光催化性能是TiO2膜的2．25倍;低pH值时复合膜催化活性较好,当甲基橙浓度≤10mg／L时,光催化脱色反应为准一级反应,而且可以用Langmuir—Hinshelwood方程描述。复合膜使用15小时催化活性没有降低。     

C和Si对热轧电工硅钢带材奥氏体体积百分率,屈服强度及延性的影响

C 和 Si 是电工硅钢中两个最重要的成分。研究了 C 和 Si 对热轧电工硅钢带材某些性能的复合影响。C 影响铁素体基体中碳化物的数量和分布。在热轧前,随着([Si]%—11.45[C]%)数值的增加,加热产生的奥氏体最大体积百分率将变得较低。从延性角度看,C 和 Si 都是脆性元素。当 Si 含量高于3.12%时,为了不使延性大大降低,C 的含量不得高于0.030%。     

NO3-光催化脱色染料废水的研究

染料工业废水在排放前必须加以处理.光催化在染料废水处理方面显示了巨大的应用优势.研究试验在NO3-存在下用紫外灯照射对甲基橙溶液进行光催化脱色.结果表明:随着NO3-含量的逐渐增加,甲基橙脱色率逐渐增加,在实验范围内没有出现NO3-加入量的最佳值;甲基橙在酸性条件下的脱色率高于碱性条件下的脱色率;当甲基橙质量浓度≤25...