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首页> 外文期刊>Catalysis Today >Effect of hydrophilic/hydrophobic properties of carbon materials on plasma-sulfonation process and their catalytic activities in cellulose conversion
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Effect of hydrophilic/hydrophobic properties of carbon materials on plasma-sulfonation process and their catalytic activities in cellulose conversion

机译：碳材料亲水/疏水性质对纤维素转化纤维化过程及其催化活性的影响及其催化活性

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The plasma sulfonation process has shown promising results on modifying carbon materials to solid acid catalysts for cellulose conversion under dilute acid solution. However, surface hydrophilic/hydrophobic properties have a great impact on interfacial interactions between a material and aqueous reaction media. In order to explore the effects of hydrophilic/hydrophobic properties during the plasma sulfonation process, we conducted sulfonation under a 1 M sulfuric acid solution on two different carbon materials: hydrophilic carbon black (CB) and hydrophobic cup-stacked carbon nanotube (CSCNT). The total acidic and sulfonate group densities were 4.4 and 2.1 mmol g(-1), and 1.5 and 0.2 mmol g(-1), in plasma-sulfonated CB and CSCNT, respectively. The degree of sulfonation was strongly related to the surface chemical properties of the original carbon materials. A hydrophilic surface provided better interactions between the water and carbon surface, which increased the kinetics of the sulfonation reactions. As a result, the total densities of the acidic groups on the hydrophilic CB were much higher compared to that on the hydrophobic CSCNT under similar plasma sulfonation conditions. The cellulose conversion and glucose selectivity of plasma-sulfonated CB were 40% and 80%, respectively, which was significantly greater than that of plasma-sulfonated CSCNT (cellulose conversion of 6% and glucose selectivity of 64%). Nevertheless, both catalysts exhibited over 97% of their original catalytic activities after recycling. The results indicate that the hydrophilicity of original carbon materials is a key factor in the plasma sulfonation process.
机译：血浆磺化过程已经显示出对稀酸溶液在纤维素转化率的固体酸催化剂上改变碳材料的有望。然而，表面亲水/疏水性质对材料和含水反应介质之间的界面相互作用产生很大影响。为了探讨亲水/疏水性质在血浆磺化过程中的影响，我们在两种不同碳材料上的1M硫酸溶液下进行磺化：亲水性炭黑（Cb）和疏水杯堆叠碳纳米管（CSCNT）。在血浆磺化CB和CSCNT中，总酸性和磺酸盐组密度分别为4.4和2.1mmol G（-1）和1.5和0.2mmol G（-1）。磺化程度与原始碳材料的表面化学性质密切相关。亲水性表面提供水和碳表面之间的更好的相互作用，其增加了磺化反应的动力学。结果，与相似的血浆磺化条件下的疏水CSCT上的酸性CB上的酸性基团的总密度高得多。纤维素转化和血浆磺化CB的纤维素转化和葡萄糖选择性分别为40％和80％，其显着大于血浆磺化CSCNT（纤维素转化率为6％，葡萄糖选择性64％）。然而，在再循环后，两种催化剂均超过97％的原始催化活性。结果表明，原始碳材料的亲水性是血浆磺化过程的关键因素。

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