Lee Young Yi, Moon Dong Ju, Kim Jong Ho, Park Nam Cook, Kim Young Chul
Department of Advanced Chemicals and Engineering and Center for Functional Nano Fine Chemicals, Chonnam National University, Gwangju 500-757, Korea.
J Nanosci Nanotechnol. 2011 Aug;11(8):7128-31. doi: 10.1166/jnn.2011.4797.
The dehydration of glycerol over nanosize niobium catalysts was conducted in a stainless steel autoclave reactor. The catalysts were prepared by the calcination of niobium oxalate between 200 and 700 degrees C. Catalysts were characterized by N2 Physisorption, XRD and TPD of ammonia to investigate the effect of the calcination temperature and water on catalytic performance, catalysts' structures and acidity. Acrolein was mainly produced about 51-71% with useful by-products such as acetaldehyde and methanol. Amorphous Nb2O5 catalysts calcined at 200-400 degrees C significantly showed higher conversion of glycerol than the crystallized Nb2O5 catalyst calcined at 500-700 degrees C. Also the conversion of glycerol and selectivity of acrolein was increased with increasing the acidity of catalyst, which can be controlled by calcination temperature.
在不锈钢高压釜式反应器中进行了纳米级铌催化剂上甘油的脱水反应。催化剂通过在200至700摄氏度之间煅烧草酸铌制备。通过N₂物理吸附、XRD和氨的TPD对催化剂进行表征，以研究煅烧温度和水对催化性能、催化剂结构和酸度的影响。主要生成丙烯醛，产率约为51 - 71%，还有乙醛和甲醇等有用副产物。在200 - 400摄氏度煅烧的非晶态Nb₂O₅催化剂比在500 - 700摄氏度煅烧的结晶态Nb₂O₅催化剂显著表现出更高的甘油转化率。此外，甘油转化率和丙烯醛选择性随着催化剂酸度的增加而提高，酸度可通过煅烧温度控制。
