研究了沸石负载过渡金属催化乙醇转化为芳香族化合物的反应。以Zn/沸石、Cu/沸石和Co/沸石为过渡金属,采用浸渍法制备了催化剂。采用X射线衍射(XRD)、比表面积分析(BET和BJH)等方法,用重量法、FTIR光谱和热重分析(TGA-Linseis STA PT 1600)对催化剂进行了表征。在固定床反应器中,在350℃和常压下进行了乙醇与芳香族化合物的反应。Zn/沸石催化剂的芳烃含量最高,约为97.39%(v/v),对乙苯的选择性最高。
不同单体组成对芳香族芽孢杆菌合成的广泛应用的(3-羟基丁酸酯)-(4-羟基丁酸酯)聚合物(PHA聚羟基脂肪酸酯)性能的影响Effects of Differing Monomer Compositions on Properties of P(3HB-co-4HB) Synthesized by Aneurinibacillus sp. H1 for Various Applications
Introduction Diesel fuel is a complex mixture of hydrocarbons including non-aromatic, mono-aromatic and polyaromatic hydrocarbons. It is well known that the composition of these compounds is closely related to the cetane number of fuel in the way that the cetane number becomes higher as the concentration of nonaromatics increases. The number becomes lower and the amount of particulate matter in exhaust gas increases as the concentration of aromatics increases. The analysis of diesel fuel is taking an important role in the automobile and fuel industries. ASTM (American Society for Testing and Materials) published the “Standard Test Method for Determination of the Aromatic Content and Polynuclear Aromatic Content of Diesel Fuels and Aviation Turbine Fuels By Supercritical Fluid Chromatography (D 5186 – 03)” using a Flame Ionization Detector (FID) in 2003 1). This application note demonstrates that SFC with supercritical CO2 can determine the non-aromatic and aromatic contents in commercially available diesel fuel in accordance with the ASTM method.