搜索结果: 61-75 共查到“知识库 催化反应工程”相关记录895条 . 查询时间(1.228 秒)
通过在Ce0.6Zr0.4O2载体上浸渍Pt（NO3）2制得Pt/Ce0.6Zr0.4O2催化剂，该催化剂在松散接触条件下，于NO+O2或O2气氛中均表现出比Pt/Al2O3更好的碳烟氧化性能. 进一步研究表明，Pt/Ce0.6Zr0.4O2催化剂中的Pt 与Ce0.6Zr0.4O2存在相互作用，使得催化剂在一定温度范围内对活性氧的利用率大为提高，从而促进了气氛中NO↔NO2的循环，乃...
酸性离子液体具有催化活性好、选择性高及易于回收等优点，是一种应用前景非常好的环境友好的酸性催化剂，在生物柴油合成反应中具有重大的理论意义和应用价值. 本文以油酸和甲醇为原料，探讨了7种不同酸性离子液体在生物柴油合成反应中的催化效应. 研究表明，离子液体酸性越强，催化酯化活性越高；引入磺酸基团可大大增强离子液体Brönsted酸性，使其在酯化反应中发挥溶剂/催化剂的双重作用，促进酯化反应向...
An electrode with Ni(Ⅱ) loaded analcime zeolite catalyst for the electrooxidation of methanol
Analcime zeolite Modified electrode Methanol Cyclic voltammetry Electrocatalytic oxidation
2014/3/8
There is a high overvoltage in the oxidation of methanol in fuel cells, and so modified electrodes are used to decrease it. A modified electrode that used Ni(Ⅱ) loaded analcime zeolite to catalyze the...
Ferric hydrogen sulfate supported on silica-coated nickel ferrite nanoparticles as new and green magnetically separable catalyst for 1,8-dioxodecahydroacridine synthesis
Magnetically separable catalyst Ferric hydrogen sulfate Nickel ferrite nanoparticles 1,8-Dioxodecahydroacridine
2014/3/8
A new magnetically separable catalyst consisting of ferric hydrogen sulfate supported on silica-coated nickel ferrite nanoparticles was prepared. The synthesized catalyst was characterized using vibra...
An efficient one-pot three-component synthesis of tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives using starch solution as catalyst
Tetrahydrobenzo[b]pyran Dihydropyrano[c]chromene Starch solution
2014/3/8
Tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives were synthesized via a one-pot three-component condensation of aromatic aldehydes with malononitrile and dimedone or 4-hydroxycouma...
Boehmite nanoparticle catalyst for the one-pot multicomponent synthesis of 3,4-dihydropyrimidin-2-(1H)-ones and thiones under solvent-free conditions
Boehmite nanoparticle One-pot synthesis Multicomponent synthesis Dihydropyrimidine Solvent-free
2014/3/8
A simple, green, and efficient synthesis protocol for the synthesis of 3,4-dihydropyrimidin-2-(1H)-ones using boehmite nanoparticles as catalyst was developed. It did not use any toxic metal catalysts...
报道一种在纯水中Pd/C催化的高效Suzuki反应体系，该体系无需除氧，且无外加配体和添加剂，底物普适性广泛，含有亲水或疏水基团的溴代芳烃都能被高效活化. 此外，对部分杂环芳烃与芳基硼酸的偶联反应也有较好的催化效果. 该催化剂可高效循环使用三次，且性能无明显下降.
Preparation and characterization of nano-CaO based on eggshell waste：Novel and green catalytic approach to highly efficient synthesis of pyrano[4,3-b]pyrans
Nano-calcium oxide Eggshell waste Biocatalyst Pyrano[4,3-b]pyrans Ball-mill
2014/3/8
Nano-CaO was prepared by calcination of ball-milled chicken eggshell waste. This novel, bioactive, heterogeneous catalyst, which had high catalytic activity and reusability, was used in the green synt...
以钴羰基簇合物为前驱体制备的钴基催化剂上F-T反应性能
钴羰基簇合物 费托合成 前驱体 浸渍法
2014/3/8
以含羧酸配体的钴羰基簇合物Co2（CO）6HCCCOOH，Co3（CO）9CCH2COOH，Co4（CO）10HCCCOOH 为前驱体，γ-Al2O3为载体，通过浸渍法制备了一系列催化剂；同时以Co（NO3）2作为前驱体制备了参比催化剂. 对制备的催化剂进行了费托反应性能评价，并用透射电子显微镜、氨程序升温脱附和傅里叶变换红外光谱等手段对催化剂进行了表征. 结果发现，不同前驱体制备的催化剂对载体上...
Poly(4-vinylpyridinium) perchlorate as an efficient solid acid catalyst for the chemoselective preparation of 1,1-diacetates from aldehydes under solvent-free conditions
Poly(4-vinylpyridinium) perchlorate Chemoselective Supported catalyst Acylation Aldehyde
2014/3/8
Poly(4-vinylpyridinium) perchlorate has been used as a supported, recyclable, environmentally-benign catalyst for the formation of acylals from aliphatic and aromatic aldehydes in good to excellent yi...
Poly(vinyl chloride)-supported Pd(Ⅱ) complex as an efficient catalyst for Heck and Cu-free Sonogashira reactions under aerobic conditions
Heck reaction Sonogashira reaction Aryl halide Poly(vinyl chloride)-anchored palladium(Ⅱ) dithizone complex
2014/3/8
A novel poly(vinyl chloride)-supported Pd complex was found to be a highly active catalyst for the Heck and Sonogashira reactions of aryl halides under aerobic conditions. The complex is thermally sta...
以水为反应介质，水合肼为还原剂，研究了痕量铜催化3-甲基蒽醌-[1，2-c]-异噁唑还原开环反应以清洁高效合成1-氨基-2-乙酰基蒽醌，考察了不同种类过渡金属硝酸盐的催化性能，发现Cu（NO3）2性能最好. 加入 2.6% 的催化剂和1.3倍的水合肼，在室温反应 2 h，底物转化率和目标产物选择性分别可达到 97.2%和 95%，TON达到38. 产品结构经氢核磁谱和质谱得以确证，主要副产为羟基取...
Mg-Al水滑石催化甘油与碳酸二甲酯的酯交换反应
甘油 碳酸甘油酯 酯交换反应 镁-铝水滑石
2014/3/8
报道了温和条件下甘油和碳酸二甲酯在一系列不同Mg/Al比（0.5-6）的Mg-Al水滑石催化下合成碳酸甘油酯（GC）的反应. 发现，Mg-Al水滑石对该反应具有很高的GC选择性，其中Mg/Al=2经400℃处理所得水滑石催化效率最高：70 ℃反应3 h甘油转化率达66.9%时，GC选择性维持在97%以上. 表征结果表明，水滑石样品的比表面积、孔径、结晶度和表面碱性对其催化活性影响很大.
采用自蔓延燃烧法制备了Ti0.9Mn0.05Fe0.05O2-δ催化剂，运用原位漫反射傅里叶变换红外光谱对该催化剂的NO和NH3稳态吸附以及NO和NH3瞬态反应进行了详细地分析与讨论. 结果表明，相比于Lewis酸性位，150℃时Brönsted酸性位吸附的NH3更具有SCR活性；与双齿硝酸盐和桥式硝酸盐相比，NO吸附产生的单齿硝酸盐是主要的中间物种；该SCR反应遵循Eley-Ridea...