搜索结果: 61-75 共查到“知识库 催化反应工程”相关记录898条 . 查询时间(1.897 秒)
混合气体中SAPO-34上单个物种的表面浓度
理想吸附溶液理论 吸附等温线 混合气体吸附 SAPO-34
2014/3/8
运用Langmuir等温线方程和理想吸附溶液理论（IAST）两种方法计算了SAPO-34在混合气体中的单个物种表面浓度，并对比了计算值与实验值的吻合程度. 考察了两个二元混合体系，分别为80 ℃的甲醇和二甲醚以及25 ℃的二甲醚和乙烯混合气，发现IAST计算值在实验压力范围内均与实验结果吻合；但是Langmuir理论计算值仅在酸性位覆盖率低于1/3时与实验值吻合较好，随着压力增加严重偏离实验值，而...
Simultaneous and sensitive detection of dopamine and uric acid using a poly(L-methionine)/gold nanoparticle-modified glassy carbon electrode
Voltammetry Gold nanoparticle Poly Dopamine Uric acid
2014/3/8
A novel electrochemical sensor was fabricated by electrodeposition of gold nanoparticles on a poly(L-methionine) (PMT)-modified glassy carbon electrode (GCE) to form a nano-Au/PMT composite-modified G...
采用程序升温脱附方法研究了甲醇分子吸附在真空退火后的二氧化钛（110）表面的光催化过程，对比分析了单独吸附甲醇分子以及甲醇分子与水分子共吸附情况下的光催化解离过程. 结果表明，在二氧化钛（110）表面吸附的甲醇分子对共吸附水分子的光催化解离过程并没有直接的帮助作用. 共吸附状态下的水分子也同样没有影响到甲醇的光致解离过程，但是水分子的存在抑制了甲醇光解产物甲醛的光致脱附过程，同时促进了甲酸甲酯的形...
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...