超声波辅助制备NiO/MCM-41催化剂及性能研究

The ultrasonic-assisted preparation and performance study of NiO/MCM-41 catalyst

文章以介孔分子筛MCM-41为载体,采用超声波辅助浸渍法制备了镍基催化剂。利用X射线衍射、透射电子显微镜和氮气-吸附/脱附的表征方法对催化剂活性组分粒径大小、分散程度及催化剂结构进行了检测。将甲苯、环戊酮、乙酸、糠醛和愈创木酚的混合物作为生物油模型化合物,用于催化裂解试验及寿命与再生试验,考察超声波辅助浸渍法对催化剂活性、使用寿命及再生性能的影响。结果表明:与普通浸渍法相比,超声波辅助浸渍法能促进催化剂活性组分粒径细化,分散度较高,催化剂比表面积较大;超声Ni O/MCM-41催化剂在催化裂解试验中表现出较高的活性,且使用寿命较长,再生性能好。

The nickel-based catalysts on the support of MCM-41 were prepared by ultrasonic- assisted impregnation method. The catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）and nitrogen adsorption/desorption techniques to observe the active material size, dispersibility, and the structures of catalysts. The mixture of toluene, cyelopentanone, acetic acid, furfural and guaiacol as the model compound of bio-oil was applied to the catalytic cracking experiment, lifetime and regeneration test to investigate the influence of ultrasonic- assisted method on the catalytic activity, lifetime and recoverability. The results showed that compared with traditional impregnation, the catalysts prepared by ultrasonic-assisted impregnation method possessed smaller active component particle size, higher dispersibility, and larger specific surface area. In the catalytic cracking experiment, the ultrasonic-assisted catalyst exhibited higher activity and longer lifetime, as well as better recoverability.