纯四方相硫化氧化锆催化剂的制备及其生物柴油合成应用研究(英文)

Synthesis of tetragonal sulfated zirconia via a novel route for biodiesel production

将过硫酸铵浸渍于直接合成的纳米氧化锆晶体表面,经300-500℃高温焙烧处理获得硫化氧化锆催化剂。采用X射线衍射（XRD）、氮气吸附-脱附、氨气程序升温脱附（NH_3-TPD）、傅里叶红外光谱（FT-IR）、扫描电镜（SEM）和能谱仪（EDS）等分析手段对催化剂的结构性能进行了表征。结果表明,所有的催化剂均展现出纯四方相结构和高的结晶度。其中,经500℃热处理获得的催化剂拥有最高的硫含量和酸性位,将其应用于大豆油与甲醇酯交换反应合成生物柴油,获得了脂肪酸甲酯收率高达84.6%的催化效果,进一步表明该催化剂表面存在优越的超强酸位。

The sulfated zirconia was prepared by directly impregnating ammonium persulphate on the crystalline zirconia and followed by the calcination temperatures of 300-500℃.The structural properties of the catalysts were characterized by X-ray diffraction （XRD）, N2 adsorption-desorption, ammonia temperature programmed desorption （NH3-TPD）, Fourier transform infrared spectroscopy （FT-IR） and a scanning electron microscope （SEM） equipped with an energy dispersive spectroscope （EDS）.The experiment results demonstrated that the catalysts presented the tetragonal structure of zirconia and high crystallinity.The catalyst calcined at 500℃ possessed the highest sulfur content and acidic sites in the catalysts.The catalyst exhibited high catalytic activity in transesterification of soybean oil with methanol.The yield of biodiesel achieved 84.6% because of the preferable super-acid sites on the surface of the catalyst.