金属-分子筛催化剂的构建、表征及其在γ-戊内酯合成中的性能研究
Construction and characterization of metal-zeolite catalysts and their performance in the synthesis of γ-valerolactone
γ-戊内酯(GVL)作为一种重要的生物质平台分子,在溶剂、燃料和化学品合成中具有广泛应用前景。以不同硅铝比的Hβ和HZSM-5分子筛为载体,采用浸渍法构建了CoNi及CoNiFe金属-分子筛催化剂,系统考察了其在乙酰丙酸与甲酸反应体系中合成GVL的催化性能。通过电感耦合等离子体质谱(ICP-MS)、X射线衍射(XRD)等手段对催化剂结构、形貌及表面性质进行表征。结果表明,金属组分在分子筛表面均匀分散,部分形成合金相,且载体酸性与孔结构对催化性能具有显著影响。在CoNiFe/Hβ-40催化剂作用下,GVL产率最高达5.57%,显著高于其他催化剂(0.14%~2.45%),为开发高效非贵金属催化剂及生物质资源高值化利用提供了理论依据。
γ-valerolactone (GVL) is an important biomass-derived platform molecule with broad application prospects in solvents,fuels,and chemical synthesis.In this study,a series of CoNi and CoNiFe metal-zeolite bifunctional catalysts supported on Hβ and HZSM-5 zeolites with different Si/Al ratios were prepared via the impregnation method.Their catalytic performance in the synthesis of GVL from levulinic acid (LA) and formic acid (FA) was systematically evaluated.The catalysts were characterized by inductively coupled plasma mass spectrometry (ICP-MS) and X-ray diffraction (XRD) and other techniques.The results indicate that the metal species were uniformly dispersed on the zeolite surface,with partial formation of alloy phases.The acidity and pore structure of the supports were found to significantly influence the catalytic performance.Among all catalysts,CoNiFe/Hβ-40 exhibited the highest GVL yield of 5.57%,significantly higher than those of other catalysts (0.14%-2.45%).This study provides a theoretical basis for the development of efficient non-noble metal catalysts and the valorization of biomass resources.
γ-戊内酯 / 分子筛 / 非贵金属催化剂 / 乙酰丙酸 / 生物质转化 / 催化剂表征
γ-valerolactone / zeolite / non-noble metal catalyst / levulinic acid / biomass conversion / catalyst characterization
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