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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Sugar hydrogenation over a Ru/C catalyst
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Sugar hydrogenation over a Ru/C catalyst

机译：Ru / C催化剂上的糖加氢

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BACKGROUND: In recent years, exploitation of renewable resources has gained considerable attention. In this respect, polyols derived from the hydrogenation of sugar molecules are versatile molecules with a variety of uses, such as low-caloric sweeteners. The hydrogenation of D-maltose, D-galactose, L-rhamnose and L-arabinose was carried out on a finely dispersed Ru/activated carbon catalyst with the objective of studying the kinetics of the production of the corresponding polyols. The reactions were carried out in a stirred tank reactor at temperatures ranging from 90 to 130 °C and hydrogen pressures from 40 to 60 bar. RESULTS: Sugar conversions up to 100% were achieved. Some by-product formation affecting the quality of the selectivity was also observed at elevated operating conditions. The catalyst was characterized by scanning electron microcopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and nitrogen physisorption. Kinetic models based on the Langmuir Hinshelwood assumptions were proposed for the reactions and a nonlinear regression was performed to obtain the numerical values of the kinetic parameters. CONCLUSIONS: The kinetic models predicted well the sugar hydrogenation process and the kinetic parameters were established. The model can be used to predict the behaviour of batchwise operating slurry reactors.
机译：背景技术：近年来，可再生资源的开发受到了广泛的关注。在这方面，衍生自糖分子氢化的多元醇是具有多种用途的多用途分子，例如低热量甜味剂。 D-麦芽糖，D-半乳糖，L-鼠李糖和L-阿拉伯糖的氢化是在细分散的Ru /活性炭催化剂上进行的，目的是研究相应多元醇的生产动力学。反应在搅拌釜反应器中在90至130℃的温度和40至60巴的氢气压力下进行。结果：糖转化率达到了100％。在升高的操作条件下也观察到一些影响选择性质量的副产物形成。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），电感耦合等离子体发射光谱（ICP-OES）和氮物理吸附来表征催化剂。提出了基于Langmuir Hinshelwood假设的动力学模型用于反应，并进行了非线性回归以获得动力学参数的数值。结论：动力学模型较好地预测了糖的加氢过程，建立了动力学参数。该模型可用于预测间歇操作淤浆反应器的行为。

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