Mimura Naoki, Muramatsu Natsumi, Hiyoshi Norihito, Sato Osamu, Masuda Yoshio, Yamaguchi Aritomo
AIST Tohoku Center, Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, 4-2-1 Nigatake, Miyagino-ku, Sendai, Miyagi 983-8551, Japan.
ACS Omega. 2018 Oct 23;3(10):13862-13868. doi: 10.1021/acsomega.8b01191. eCollection 2018 Oct 31.
Here, we report the development of catalysts comprising highly dispersed Au on an alumina (AlO) support for the oxidation of glycerol to high-value carboxylic acids in a liquid-phase flow reactor. The catalysts were prepared by means of a deposition-precipitation method. To ensure that the catalysts could be used for long-term catalytic conversions in a liquid-phase flow reactor, we chose an alumina support with high temperature stability and a particle size (50-200 μm) large enough to prevent leakage of the catalyst from the reactor. One of the five catalysts had a high catalytic activity for the conversion of glycerol to the high-value carboxylic acids, glyceric acid and tartronic acid (conversion of glycerol >70%), and the catalyst retained its catalytic activity over long-term use (up to 1770 min). Pretreatment of the catalyst with fructose, a mild reductant, increased the activity of the catalyst. Scanning transmission electron microscopy revealed three Au species highly dispersed on the surface of the alumina support-Au nanoparticles (mode = 7.5-10 nm), Au clusters (1-2 nm), and atomic Au.
在此，我们报告了一种催化剂的研发情况，该催化剂由高度分散在氧化铝（AlO）载体上的金组成，用于在液相流动反应器中将甘油氧化为高价值羧酸。这些催化剂通过沉积沉淀法制备。为确保催化剂能够在液相流动反应器中用于长期催化转化，我们选择了具有高温稳定性且粒径足够大（50 - 200μm）以防止催化剂从反应器中泄漏的氧化铝载体。五种催化剂中的一种对甘油转化为高价值羧酸甘油酸和酒石酸具有高催化活性（甘油转化率>70%），并且该催化剂在长期使用（长达1770分钟）过程中保持其催化活性。用温和还原剂果糖对催化剂进行预处理提高了催化剂的活性。扫描透射电子显微镜显示三种金物种高度分散在氧化铝载体表面——金纳米颗粒（众数 = 7.5 - 10nm）、金簇（1 - 2nm）和原子金。
