The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Thailand.
Bioresour Technol. 2010 Jun;101(11):4179-86. doi: 10.1016/j.biortech.2010.01.037.
The simultaneous hydrolysis/dehydration reaction of sugarcane bagasse, rice husk and corncob was studied under hot compressed water in the presence of TiO(2), ZrO(2) and TiO(2)-ZrO(2) at 473-673K. Among them, the reaction of corncob at 573K in the presence of TiO(2)-ZrO(2) produced the highest furfural and 5-hydroxymethylfurfural (HMF) yields (10.3% and 8.6%) with less by-products (i.e. glucose, fructose, xylose, and 1,6-anhydroglucose) selectivities. It was found that the catalyst preparation procedure and calcination temperature strongly affected its reactivity. Catalysts prepared by (co-) precipitation method gained higher reactivity than those prepared by sol-gel and physical mixing methods. The suitable calcination temperature for TiO(2) and ZrO(2) was at 773K, whereas that for TiO(2)-ZrO(2) was at 873K; the XRD patterns revealed that different portions of phase formation were observed over catalysts with different calcination temperature. The portion of these phase formations affected the acidity-basicity of catalyst and thus the catalyst reactivity.
在 473-673K 下，在 TiO(2)、ZrO(2) 和 TiO(2)-ZrO(2) 的存在下，研究了甘蔗渣、稻壳和玉米芯在热加压水中的同时水解/脱水反应。其中，在 TiO(2)-ZrO(2) 的存在下，573K 下的玉米芯反应生成了最高的糠醛和 5-羟甲基糠醛（HMF）产率（10.3%和 8.6%），副产物（即葡萄糖、果糖、木糖和 1,6-脱水葡萄糖）选择性较低。研究发现，催化剂的制备程序和煅烧温度对其反应性有很大影响。共沉淀法制备的催化剂比溶胶-凝胶法和物理混合法制备的催化剂具有更高的反应性。TiO(2)和 ZrO(2)的适宜煅烧温度为 773K，而 TiO(2)-ZrO(2)的适宜煅烧温度为 873K；XRD 图谱表明，不同煅烧温度下的催化剂观察到不同部分的相形成。这些相形成的部分影响了催化剂的酸碱性，从而影响了催化剂的反应性。
