On the oxidative coupling of methane with carbon dioxide over CeO2/ZnO nanocatalysts

The nano-CeO₂/ZnO catalysts were prepared using a novel combination of homogeneous precipitation with micro-emulsion for oxidative coupling of methane with CO₂ as an oxidant. The prepared catalysts were compared with those prepared using the conventional impregnation. The catalysts prepared in two ways were characterized with FTIR, TEM, XRD and CO₂-TPD. The effects of the reaction temperature, the amount of ZnO doped in the catalysts and the average size were investigated. The experimental investigation demonstrated that methane conversion over the nano-CeO₂/ZnO catalysts prepared by the combined technique was higher than that obtained over catalysts prepared by the conventional impregnation. A better low-temperature activity has also been achieved over the nanocatalysts. There was no clear trend between the average size of nano-CeO₂/ZnO catalysts and their catalytic performance but methane conversion increased with increasing fractal dimension of nanocatalysts.     

Surface modification of water treatment equipment for reducing CaSO4 scale formation

Scale formation has been recognised as a widespread problem in membrane filtration and water desalination processing for water treatment. In this paper, the effect of surface energy of Ni-P-PTFE composite coatings on the microstructure and adhesion of CaSO₄ deposits was investigated. The surface energies of the Ni-P-PTFE coatings were altered by changing the PTFE proportion in the coatings. Initial experimental results showed that the surface energy of the coatings had a significant influence on the microstructure and adhesion of CaSO₄ deposits. The Ni-P-PTFE coatings have a potential for reducing CaSO₄ scale formation on water treatment equipment.     

纳米TiO2在塑料中的抗菌性能研究

本文利用纳米TiO2作为无机抗菌填料，研制抗菌杀毒、表面自洁功能的塑料，其杀菌性能达到97％以上。探讨了纳米TiO2填料的杀菌性能影响因素及其杀菌广谱性。     

纳米TiO_2可见光催化零VOC内墙乳胶漆

介绍了纳米TiO2光催化的机理和特点、纳米TiO2可见光催化零VOC内墙乳胶漆的性能和应用等。表明其不仅是零VOC无毒无害,而且是一种能在一般室内照明条件下净化空气的内墙乳胶漆。     

Reduction of NO2 stored in a commercial lean NO x trap at low temperatures

Isothermal storage of NO₂ and subsequent reduction with different reducing agents (H₂, CO or H₂ + CO) in a lean NO _x trap catalyst was tested by Temperature Programmed Desorption (TPD) and Temperature Programmed Reduction (TPR) experiments at temperatures representative of automotive “cold-start” conditions (<200 °C) using a commercial NO _x trap catalyst. Results from the TPR experiments revealed that no reduction of stored NO₂ to N₂ was observed at 100–180 °C, and at 200 °C 10% reduction only of NO₂ to N₂ was measured. A special affinity of H₂ to form NH₃ was observed during the reduction of stored NO₂. The formation of NH₃ increases with increasing amount of stored NO₂ and decreases with increasing storage temperature. Direct relation exists between the amount of adsorbed and/or stored NO₂ and the formation of H₂O and NH₃.     

2-十四烷氧基苯胺的合成

首先简介了 2 十四烷氧基苯胺的性质、用途以及国外的 3种合成方法。然后介绍了山西大学环境技术研究所以邻氨基苯酚和乙酸酐为原料合成 2 十四烷氧基苯胺的方法,并测定了该产品的质量指标。最后评价了该合成工艺易于实现工业化生产。     

2，6－双（5－硝基－2－糠叉）环己酮的制备

用５－硝基糠叉二醋酸酯与环己酮在６０％Ｈ３ＰＯ４溶液中缩合制得标题物。反应混合物在１００℃下搅拌反应５ｈ得６１％的２，６－双（５－硝基－２－糠叉）环己酮。分别经ＩＲ、１ＨＮＭＲ、ＭＳ、ＵＶ、ＴＬＣ和元素分析进行了表征和鉴定。     

Role of La2O3 in Pd-Supported Catalysts for Methanol Decomposition

Systems of Pd supported on various La₂O₃-modified -Al₂O₃ and CeO₂–Al₂O₃ catalysts were tested for catalytic methanol decomposition and characterized by means of XRD, BET, TPR, H₂-chemisorption and CO–FTIR. The addition of lanthanum significantly improved the selectivity of CO and H₂ for all the catalysts but showed a different influence on the catalytic activity in two systems. Methanol conversion decreased on La₂O₃-modified Pd/-Al₂O₃ catalysts, in line with the reduction of Pd dispersion, while the addition of La₂O₃ improved the dispersion of Pd and reinforced Pd–CeO₂ interaction for La₂O₃-modified Pd/CeO₂–Al₂O₃ catalysts, which resulted in a high production rate of CO and H₂. Thus, a synergistic effect between CeO₂ and La₂O₃ was observed on -Al₂O₃-supported Pd catalyst for methanol decomposition.     

应用免疫斑点法检测不同工艺灭活的乙肝血源疫苗中的前S_1和S_2蛋白

作者应用前 S_1、前 S_2和 HBsAg/a 单克隆抗体,用免疫斑点法(Immuno-spot)检测同一批的乙肝表面抗原分别经加热灭活和三步化学灭活后的前 S_1和前 S_2蛋白保留情况,比较了两种工艺对前 S_1和前 S_2蛋白的影响。结果表明;加热灭活可保留前 S_1和前 S_2蛋白,三步化学灭活使前 S_1和前 S_2蛋白丢失,从抗原组成上看,加热灭活后的抗原更接近自然抗原。首次报告了含有前 S_1蛋白的乙肝疫苗,并对前 S_1和前 S_2蛋白在乙肝血源疫苗中的可能作用进行了讨论。     

2,6-萘二甲酸二甲酯与一些二甲基萘所形成的激基复合物

2,6-萘二甲酸二甲酯与一些二甲基萘可以形成激基复合物。本文通过稳态和动态荧光光谱研究了这类激基复合物的形成与分子结构的关系。结果表明,尽管这些二甲基萘的电离能基本相同,但因取代基位置不同使分子中电荷分布不同,从而影响了激基复合物的形成能力。