高表面积高分散度铜基催化剂的制备及其性能研究

Preparation and properties of copper-based catalysts with high surface area and high dispersion

摘要:

本文对传统共沉淀法进行改进，成功制备出高表面积（383.87 m2/g）高分散度（42.74%）的新型Cu-O-Al骨架结构催化剂，表征结果表明，改进后的制备方法可以有效增大催化剂比表面积和孔容，并使得催化剂上铜物种的颗粒更小、分散度更高，进而表现出较高的催化活性。同时由于形成了Cu-O-Al骨架结构，可以显著抑制铜物种的移动，进而提高催化剂的稳定性。本文以成本较低的空气作为氧源，在典型催化剂（CuAl3）上反应温度300 ℃、较高液时空速2 h-1下，MOP最佳转化率为85.2%，MOA选择性为55.7%，且稳定运行32 h，而该空速下传统浸渍法制备的催化剂已基本无催化活性。

Abstract:

In this paper, the traditional coprecipitation method was improved, and a new Cu-O-Al framework catalyst with high surface area (383.87 m2/g) and high dispersion (42.74%) was successfully prepared. The characterization results show that the improved preparation method can effectively increase the The large specific surface area and pore volume of the catalyst make the particles of copper species on the catalyst smaller and the dispersion degree higher, thereby showing higher catalytic activity. At the same time, due to the formation of the Cu-O-Al framework structure, the migration of copper species can be significantly inhibited, thereby improving the stability of the catalyst. In this paper, air with lower cost was used as the oxygen source, and the reaction temperature was 300 ℃ on a typical catalyst (CuAl3) and the liquid hourly space velocity was 2 h-1, the optimal conversion rate of MOP was 85.2%, and the selectivity of MOA was 55.7%. And stable operation for 32 h, and the catalyst prepared by traditional impregnation method at this space velocity has basically no catalytic activity.