脱铝分子筛固体酸催化葡萄糖制备5-羟甲基糠醛
Preparation of 5-hydroxymethylfurfural from glucose catalyzed by dealuminized molecular sieve solid acids
何世坤 1张荣花 1李昊阳 1潘晖 2冯君锋2
作者信息
- 1. 南京林业大学化学工程学院,江苏南京 210037
- 2. 南京林业大学化学工程学院,江苏南京 210037;南京林业大学江苏省林业资源高效加工利用协同创新中心;江苏省高校农林生物质化学与利用国家重点实验室培育建设点,江苏南京 210037
- 折叠
摘要
利用不同浓度的硝酸对HY分子筛进行脱铝处理,脱铝后的HY分子筛具有不同的比表面积和孔径.以脱铝后的分子筛作为载体,利用浸渍法制备了 Sn掺杂的双功能催化剂,并将其用于葡萄糖转化为5-HMF的反应.通过X射线衍射(XRD)、扫描电镜(SEM)、N2吸附/解吸、X射线光电子能谱(XPS)和酸碱滴定等手段对催化剂进行表征.结果表明:合成的0.5mol/L-10％Sn-HY具有介孔结构、八面体形貌和适宜的B/L酸位比等.以甲基异丁基酮(MIBK)和NaCl-H2O作为反应体系,在0.2g催化剂、165℃、60min的优化条件下,5-羟甲基糠醛的得率为67.3％.经过5次循环后,5-HMF得率仍旧可以达到49％,说明催化剂具有良好的稳定性.同时,初步探究葡萄糖转化为5-HMF的反应机理.总的来说,这项工作建立了一个高效的多相催化系统,展示了将生物质转化为平台化合物的巨大潜力.
Abstract
HY molecular sieves were dealuminized with nitric acid of different concentrations.The dealuminized HY molecular sieves had different specific surface areas and pore sizes.The Sn-doped bifunctional catalyst for the conversion of glucose to 5-HMF was prepared by impregnation method using the dealuminized molecular sieve as the carrier.The catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N2 adsorption/desorption,X-ray photoelectron spectroscopy(XPS)and acid-base titration.The results showed that the synthesized 0.5mol/L-10％Sn-HY had mesoporous structure,octahedral morphology and suitable B/L acid site ratio.In the reaction system of methyl isobutyl ketone(MIBK)and NaCl-H2O,the yield of 5-hydroxymethylfurfural was 67.3％under the optimized conditions of 0.2g catalyst,165℃ and 60min.After five cycles,the 5-HMF yield could still reach 49％,indicating that the catalyst had good stability.Meanwhile,the reaction mechanism for the conversion of glucose to 5-HMF was preliminarily investigated.Overall,this work established an efficient multiphase catalytic system that demonstrated the great potential of converting biomass into platform compounds.
关键词
催化剂/分子筛/生物质/双相体系/5-羟甲基糠醛Key words
catalyst/molecular sieves/biomass/biphasic system/5-hydroxymethylfurfural引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据