Abstract As one of the major products from cellulose pyrolysis, levoglucosan (LG) is highly oxygenated and stubborn, causing serious problems to bio-oil utilization. In this study, catalytic ketonization of LG over nano-CeO2 was performed in a pyrolyzer-gas chromatography/ mass spectrometry (PY-GC/MS) system to prepare hydrocarbon precursors (principally ketones). Nano-CeO2 has been proven effective to convert LG into ketones, with the highest selectivity (71.2 %) obtained when CeO2 to LG ratio was 15:1 (mm3: mg) at 700 °C. When 5% ZrO2 was loaded on CeO2 (5% Zr/CeO2), the selectivity of ketones further increased to 76.0 %, and that of linear compounds in all the ketone products reached 53.9 %. Results from catalyst characterization revealed that 5% Zr/CeO2 contained an abundance of basic surface sites and redox capacity, thus leading to high ketonization activity. Ketonization of LG possesses significant potential in facilitating the conversion of cellulose into high-quality biofuels in a sustainable way.

中文翻译：

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左旋葡聚糖在纳米 CeO2 上催化酮化生产碳氢化合物前体

摘要 作为纤维素热解的主要产物之一，左旋葡聚糖（LG）具有高度氧化性和顽固性，给生物油的利用带来了严重的问题。在这项研究中，在热解器-气相色谱/质谱 (PY-GC/MS) 系统中，通过纳米 CeO2 对 LG 进行催化酮化，以制备碳氢化合物前体（主要是酮）。Nano-CeO2 已被证明可以有效地将 LG 转化为酮，当 CeO2 与 LG 的比例为 15:1 (mm3: mg) 在 700 °C 时，选择性最高 (71.2%)。当CeO2 负载5% ZrO2 (5% Zr/CeO2) 时，酮的选择性进一步提高到76.0 %，所有酮产物中线性化合物的选择性达到53.9 %。催化剂表征结果表明，5% Zr/CeO2 含有丰富的碱性表面位点和氧化还原能力，从而导致高酮化活性。LG 的酮化在促进纤维素以可持续方式转化为高质量生物燃料方面具有巨大潜力。