非晶态催化剂催化苯酚和对甲酚加氢脱氧性能研究.pdfVIP

Abstract With the decreasing of coal, petroleum, nature gas, and other mainstream non-renewable energy , biomass, as the only renewable energy that can be converted to liquid fuels, has been attracting more and more attention. Bio-oils were mainly obtained from biomass by fast pyrolysis or high-pressure liquefaction. However, such ways of production make the content of the oxygen in these bio-oils too high, and some of them are even high to 50%, which in consequence lead to high viscosity, thermal instability, poor chemical stability, corrosiveness and immiscibility with hydrocarbon fuels etc, thus the transportation and utilization of the bio-oils are seriously impacted. Therefore, the hydrodeoxygenation (HDO) for bio-oil upgrading and to make it be more widely used became an important research. In this paper, Ni–W–B 、Co–W–B 、Co–Mo–B 、 La–Co–Mo–B and La–Ni–Mo–B amorphous catalysts were prepared by chemical reduction, and the catalysts were characterized by BET, SEM, XPS and XRD. The influences of lanthanum in hydrodeoxygenation performances of the Co-Mo-B catalyst were tested using phenol and 4–cresol as the model compound. The results showed that all of these catalysts were amorphous structure. W6+ was not reduced by NaBH in catalysts, but presented in the form of WO , acting as the absorption 4 3 center of Brønsted acid. The series of W catalysts exhibited high activity: under the temperature of 548K, the deoxygenation selectivity of phenol by Ni–W–B catalysts could reach 100% in 10 hours. The order of catalytic deoxygenation activity conformed to the f