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Vapor phase alkylation of toluene using various alcohols over H3PO4/MCM-41 catalyst: influence of reaction parameters on selectivity and conversion
Alkylation toluene mesoporous MCM-41 vapor phase H3PO4
2010/12/20
A mesoporous MCM-41 molecular sieve material with a molar ratio of SiO2/Al2O3 = 70 and loaded with H3PO4 was used as a catalyst for the alkylation of toluene, using various alcohols, namely methanol, ...
采用失重法、电化学法和紫外-可见吸收光谱研究了3.0 mol/L H3PO4介质中，稀土Ce4+和香兰素(4-羟基-3-甲氧基-苯甲醛)对冷轧钢的缓蚀协同效应。 结果表明，香兰素对冷轧钢有中等程度的缓蚀作用，缓蚀率随其浓度的增加而增大，最大缓蚀率为66%，在钢表面的吸附符合Freundlich吸附模型；稀土Ce4+对冷轧钢的缓蚀作用较差，最大缓蚀率仅为20%左右。 稀土Ce4+和香兰素复配后对冷轧...
Anodic Behavior of Tungsten in H3PO4-K2SO4-H2SO4/KOH Solutions
Anodic Behavior Tungsten H3PO4-K2SO4-H2SO4/KOH Solutions
2010/4/22
Potentiodynamic and potentiostatic polarizations were used to study the effect of pH on the anodic reaction characteristics of tungsten (W) in a very broad pH range (0.4-13). The open circuit potentia...