Catalytic glucose and fructose conversions with TiO2 and ZrO2 in water at 473 K:: Relationship between reactivity and acid-base property determined by TPD measurement
Catalytic glucose and fructose conversions with TiO2 and ZrO2 in water at 473 K:: Relationship between reactivity and acid-base property determined by TPD measurement
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DOI：
10.1016/j.apcata.2005.08.007
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发表时间：
2005-11-09
影响因子：
5.5
通讯作者：
Inomata, H
中科院分区：
文献类型：
--
作者：
Watanabe, M;Aizawa, Y;Inomata, H
使用间歇式反应器在473K的热压缩水中检查了TiO 2 (锐钛矿TiO 2 或金红石TiO 2 )和ZrO 2 (单斜/四方混合物ZrO 2 )对葡萄糖和果糖反应的影响。金红石 TiO2 (r-TiO2) 在葡萄糖反应过程中不活跃。 ZrO2 (m/c-ZrO2) 的单斜/四方混合物是该温度下反应的碱性催化剂。锐钛矿型 TiO2 (a-TiO2) 在反应过程中同时表现出酸性和碱性。为了了解a-TiO2、r-TiO2和m/c-ZrO2的催化活性，我们分别通过NH3-和CO2-TPD测量了酸度和碱度。 TPD分析表明，m/c-ZrO2上的酸位点数量(670 μ mol/g)和碱位点(550 p,mol/g)在这三种催化剂中最高，而a-TiO2的酸位点密度(17 μ mol/m(2))和碱位点密度(9 μ mol/m(2))最高。这种酸度和碱度分析表明，碱度的量是异构化的关键因素，而酸度和碱度的密度对于葡萄糖形成HMF很重要。 (c) 2005 Elsevier B.V. 保留所有权利。
The effects of TiO2 (anatase TiO2 or rutile Ti02) and ZrO2 (monoclinic/tetragonal mixture ZrO2) on glucose and fructose reactions were examined in hot-compressed water at 473 K with a batch type reactor. Rutile TiO2 (r-TiO2) is inactive during glucose reactions. A monoclinic/ tetragonal mixture of ZrO2 (m/c-ZrO2) was the basic catalyst for the reaction at this temperature. Anatase TiO2 (a-TiO2) showed both acidity and basicity during the reactions. In order to understand the catalytic activity of a-TiO2, r-TiO2, and m/c-ZrO2, we measured the acidity and basicity by means of NH3- and CO2-TPD, respectively. The TPD analysis showed us that the amount of acid (670 mu mol/g) and base (550 p,mol/g) sites on m/c-ZrO2 were the highest among these three catalysts, while the density of acid site (17 mu mol/m(2)) and that of basic site (9 mu mol/m(2)) of the a-TiO2 were the highest. Such the acidity and basicity analyses suggested that the amount of basicity was the key factor for the isomerization while the density of acidity and basicity was important for the HMF formation from glucose. (c) 2005 Elsevier B.V. All rights reserved.