Effect of La_2O_3/γAl_2O_3 Catalyst on the Activation of CH_4 and CO_2 to C_02 Hydrocarbons under Non-equilibrium Plasma

The oxidative coupling of methane (OCM) to C2 hydrocarbons using carbon dioxide as oxidant is an attractive process from environmental point of view. Only a few research papers reported for it1-3. In general, the yield of C2 hydrocarbons was about 6%. This indicated that the method of catalytic activation was unfavorable to the reaction. It is necessary for us to find a new method in order to activate reaction and improve C2 hydrocarbon yield. Non-equilibrium plasma is a cold plasma in…     

DIRECT SOMATIC EMBRYOGENESIS AND PLANT REGENERATION FROM PROTOPLAST-DERIVED CELLS OF WHEAT (Triticum aestivum L.)

Protoplasts were isolated from embryogenic calli derived from immature embryos ofwheat (Triticum aestivum L. cv. Jinan 177). The protoplasts were cultured in NMB mediumsupplemented with 1mg/L 2,4- D and 500mg/l casein hydrolysate (CH). The regenerated cellsfrom protoplasts divided to form somatic embryos directly. The somatic embryos grown to1.5- 2 mm in size directly developed into complete plants on solid MB medium without hor-mones.     

Direct Synthesis of Oxygenates from Water and Methane via Dielectric-barrier Discharge

In this investigation, a clean, atomic economic and direct synthesis of oxygenates (methanol, ethanol) form water and methane via dielectric-barrier discharge was developed at room temperature and under atmospheric pressure. The effect of discharge voltage on this process was studied. The results showed that the conversion of water can be as high as 7%, the selectivity of methanol and ethanol can be as high as 100%.     

脱色阴离子交换剂的再生研究

提出一种新的离子交换剂再生理论，即吸附物的脱附依靠离子交换和络合的协同效应完成．以二价钙离子为再生剂，对糖液脱色用的阴离子交换树脂和阴离子交换纤维进行再生，并与传统的碱性钠盐相比较，研究证明钙离子为再生剂的工艺，具有低成本、无污染的特点．     

大孔网状吸附剂在微生物制药分离纯化上的应用

本文介绍了20世纪末高分子吸附剂在β-内酰胺类，肽类、糖苷类，醌类，含氮杂环类，多烯类、蒽环类，大环内酯类，聚醚类和其它新抗生素，免疫抑制剂，酶抑制剂以及蛋白质类药物分离纯化上的应用发展状况。     

大孔树脂吸附法处理含苯肼工业废水的研究

以Hz-841大孔树脂为吸附剂,95%乙醇为脱附剂处理含苯肼4000~5000mg/L的工业废水,取得了理想的分离效果,苯肼吸附率>99.8%,树脂工作吸附量40~50g/L。     

高分子负载加氢催化剂中钯流失的研究——Ⅰ.高分子载体的影响

高分子催化剂由于同时具有多相催化剂和均相催化剂的优点,已引起了广泛的重视.然而表面活性组份贵金属的流失直接影响了此类高活性催化剂的推广应用.作者合成了不同载体的几类负载钯催化剂,探讨其在1,5,9-环十二碳三烯的选择加氢反应过程中钯的流失规律.从改变高分子配位体入手,通过调整聚合物载体的物理性能、配位原     

Quantum chemical study on the one-carbon unit transfer of imidazolinium

One-carbon unit transfer reaction of folate cofactor model compound, 1-acetyl-2-methyl-imidazolinium, with 1,2-diaminobenzene has been studied theoretically with ONIOM method. The result shows that there are two pathways to complete this reaction because the imidazolinium ring has two breaking patterns. Both the two pathways have six steps. They are combination of two reactants, proton migration, break of five-membered ring, formation of benzimidazole derivate, another proton migration, and formation of final products. In each of the above pathways, the two proton migration steps have higher energy, which illuminate that the reaction is catalyzed by general acid-base. This fact agrees with the experimental results of enzymatic one-carbon unit transfer at oxidation level of formate.     

硅胶负载钯催化剂对丙烯酸甲酯的催化加氢性能研究

本文报导一种新法制备的硅胶负载钯催化剂,其活性组份大部分负载于载体的表面。该催化剂在常温常压下对丙烯酸甲酯的液相加氢反应,即有很高的活性和良好的重复使用性能。 催化剂按下法制备:在圆底烧瓶中加入1.00g硅胶和20mL甲醇,抽真空置换出硅胶孔内的空气,在搅拌下加入一定浓度的吸附质(聚乙烯亚胺、正丙胺、正丁胺等),在25℃反应3—4小时,过滤,固体经甲醇充分洗涤后和一定浓度的氯化钯甲醇溶液反应6小时。过     

对硝基氯苄与活性亚甲基化合物的反应

对硝基苄基衍生物可以与许多阴离子起单电子转移的亲核取代反应。Kornblum等以对硝基氯苄为底物,2-乙氧羰基香豆满-3-酮的钠盐为阴离子,作了深入的研究,得出对硝基氯苄与2-乙氧羰基香豆满-3-酮钠盐的C-烷化反应机理为自由基链式亲核取代反应。同时,Russell等提出对硝基氯苄与2-