Designing and synthesizing bio-based catalysts for the catalytic conversion of biomass to high-value chemicals is a green and promising route in the field of sustainable chemistry. Herein, VxOy/NC_P catalyst was synthesized by a simple impregnation-pyrolysis method using green and cheap bio-chitin or chitosan as the N-doped carbon (NC) precursor and was applied to the aerobic oxidation of ethyl lactate (EL) to ethyl pyruvate (EP). These catalysts were characterized by XRD, N2 adsorption-desorption, SEM, TEM, XPS, and H2-TPR. When chitin was used as the NC precursor (VxOy/NC_chitin), the catalyst activity was significantly higher than that of chitosan as the NC precursor (VxOy/NC_chitosan). Correlation between catalytic performance and characterization results showed that the high surface area, abundant pyridinic-N, and low valence vanadium species (V3+ and V4+) played an important role in catalyst activity. A 97.3 % EL conversion with 97.8 % EP selectivity was obtained over VxOy/NC_chitin at 120 °C for 2 h, and no significant deactivation after five cycles. Moreover, this catalyst also showed a high activity in the selective oxidation of other alcohols to their corresponding aldehydes.

中文翻译：

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甲壳素衍生的NC载体氧化钒作为乳酸乙酯氧化成丙酮酸乙酯的高效催化剂


设计和合成生物基催化剂用于将生物质催化转化为高价值化学品是可持续化学领域一条绿色且有前景的路线。本文以绿色廉价的生物甲壳素或壳聚糖为氮掺杂碳（NC）前驱体，通过简单的浸渍热解法合成了VxOy/NC_P催化剂，并将其应用于乳酸乙酯（EL）有氧氧化生成丙酮酸乙酯（EP）。通过 XRD、N2 吸附-解吸、SEM、TEM、XPS 和 H2-TPR 对这些催化剂进行了表征。当使用甲壳素作为NC前体(VxOy/NC_chitin)时，催化剂活性显着高于壳聚糖作为NC前体(VxOy/NC_chitosan)。催化性能和表征结果之间的相关性表明，高比表面积、丰富的吡啶-N和低价钒物种（V3+和V4+）对催化剂活性起着重要作用。在 120 °C 下 2 小时，VxOy/NC_chitin 获得了 97.3 % EL 转化率和 97.8 % EP 选择性，并且在五个循环后没有明显失活。此外，该催化剂在其他醇选择性氧化为其相应醛的过程中也表现出很高的活性。