Promising bifunctional catalyst systems composed of platinum and polyoxometalates (POMs) were applied successfully for the selective catalytic hydrogenation of 2,5-dimethylfuran (DMF) to 2-hexanol under mild conditions. Pt(acac)₂ was found to be the most active Pt precursor for the ring opening of DMF, and the Keggin-type POM K₃[PW₁₂O₄₀] was identified as the most promoting acidic support for 2-hexanol formation at 80 °C and 10 bar H₂ pressure using n-decane as a carrier liquid. It was revealed that modifications in the synthetic procedure of the Pt/K₃[PW₁₂O₄₀] catalytic system allowed its catalytic performance to be enhanced. Thus, a higher yield of 2-hexanol (72.5%) was achieved compared to that (49%) obtained using a commercial Pt/C catalyst with the same Pt loading. The Wells–Dawson-type POM containing catalyst Pt/K₆[α-P₂W₁₈O₆₂] was found to be selective for 2-hexanon formation (56.4% yield) under identical reaction conditions. Furthermore, furan and 2-methylfuran were also selectively hydrogenated to 1-butanol (59.7% yield) and 1/2-pentanol (44.3% yield), respectively, under the applied reaction conditions. Moreover, using analytical tools like N₂-physisorption, NH₃-TPD, inductively coupled plasma optical emission spectroscopy (ICP-OES), CO chemisorption, and transmission electron microscopy (TEM), revealed that the higher total acid site density of the K₃[PW₁₂O₄₀] enhances C=O hydrogenation and overcomes the rate-limiting step of 2-hexanone hydrogenation to 2-hexanol. This demonstrates the high performance of the bi-functional catalyst system Pt/K₃[PW₁₂O₄₀] towards ring opening of various furans and the very high selectivity towards alcohol formation. This approach opens new interesting valorization pathways for several furanic compounds with respect to sustainable alcohol formation. © 2021 The Authors. Biofuels, Bioproducts and Biorefining published by Society of Industrial Chemistry and John Wiley & Sons Ltd.

中文翻译：

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在温和的反应条件下，使用 Pt/多金属氧酸盐催化剂将生物质衍生的呋喃选择性催化氢化为仲醇

由铂和多金属氧酸盐 (POM) 组成的有前景的双功能催化剂体系已成功应用于在温和条件下将 2,5-二甲基呋喃 (DMF) 选择性催化氢化为 2-己醇。发现Pt(acac) ₂是 DMF 开环最活跃的 Pt 前体，Keggin 型 POM K ₃ [PW ₁₂ O ₄₀ ] 被鉴定为在 80 ℃时最促进 2-己醇形成的酸性载体°C 和 10 bar H ₂压力，使用正癸烷作为载液。结果表明，Pt/K ₃ [PW ₁₂ O ₄₀] 催化体系使其催化性能得到提高。因此，与使用具有相同 Pt 负载量的商业 Pt/C 催化剂获得的产率 (49%) 相比，获得了更高的 2-己醇产率 (72.5%)。发现含有催化剂 Pt/K ₆ [ α -P ₂ W ₁₈ O ₆₂ ]的 Wells-Dawson 型 POM在相同的反应条件下对 2-己酮的形成具有选择性（产率 56.4%）。此外，在所应用的反应条件下，呋喃和 2-甲基呋喃也分别选择性地氢化为 1-丁醇（产率 59.7%）和 1/2-戊醇（产率 44.3%）。此外，使用 N _{2 -}物理吸附、NH ₃等分析工具-TPD、电感耦合等离子体发射光谱 (ICP-OES)、CO 化学吸附和透射电子显微镜 (TEM) 表明，K ₃ [PW ₁₂ O ₄₀ ]较高的总酸中心密度增强了 C=O 氢化和克服了 2-己酮氢化成 2-己醇的限速步骤。这证明了双功能催化剂体系 Pt/K ₃ [PW ₁₂ O ₄₀] 对各种呋喃的开环和对醇形成的非常高的选择性。这种方法为几种呋喃化合物在可持续酒精形成方面开辟了新的有趣的增值途径。© 2021 作者。工业化学协会和 John Wiley & Sons Ltd. 出版的 Biofuels, Bioproducts and Biorefining