| 1 | 双金属氧化物Co_(3)AlO_(x)催化糠醛加氢制备糠醇显示文摘合成了Co/Al双金属氧化物催化剂,并将其用于催化还原糠醛制备糠醇。通过调节Co/Al的物质的量之比,探讨了活性金属的比例对催化剂物理、化学性质的影响。N_(2)吸附/脱附等温线分析表明,制备得到的系列Co_(x)AlO_(y)催化剂为平均孔径20 nm左右的介孔材料;NH_(3)-TPD分析表明,中等强度酸位点占主导有利于糠醛加氢制糠醇。Co/Al物质的量比3∶1时制得的催化剂Co_(3)AlO_(x)表现出优异的催化活性,在反应物0.3 g糠醛、溶剂20 mL 1,4-二氧六环、催化剂Co_(3)AlO_(x)用量0.12 g,反应时间3 h,H_(2)压力2 MPa,反应温度120℃条件下,糠醛转化率超过98.95%,糠醇得率可以达到96.25%。XRD、TEM和XPS分析表明:Co_(3)AlO_(x)以CoAl_(2)O_(4)和Co_(2)O_(3)的混合相形式存在,比表面积和中等强度酸是影响催化活性的关键因素。Co_(3)AlO_(x)催化剂经过5次循环实验后,催化活性仍能保持83.13%,具有十分良好的循环稳定性。 | 姜伟 辛颖 巩明月 王伟众 王东军 孙勇 | 2022 | 林产化学与工业2022，42，5： | 0 |
| 2 | Production of biomass-derived monomers through catalytic conversion of furfural and hydroxymethylfurfural显示文摘The synthesis of biomass-derived monomers has received great attention in recent years,motivated by the depletion of fossil fuels and environmental issues.Moreover,the intrinsic functionality within the biomass or biomass-derived chemicals has great potential to produce new types of monomers containing multiple acid or alcohol groups,thereby leading to materials with novel properties.Given their versatile functional groups and easy production from cellulose/hemicellulose,furfural and hydroxymethylfurfural were regarded as very important biomass-derived platform chemicals through which multiple monomers can be produced via heterogeneous catalysis.In the current review,recent development in heterogeneous catalysis for the production of 6 bio-based monomers,furfuryl alcohol,2,5-bis(hydroxymethyl)furan,2,5-bis-(hydroxymethyl)tetrahydrofuran,1,5-pentanediol,1,6-hexanediol,and 2,5-furandicarboxylic acid,from furfural and hydroxymethylfurfural is reviewed and summarized.The major challenge is how to efficiently and selectively convert specific functional group(s)in furfural and hydroxymethylfurfural during the production of these monomers.Additionally,catalyst stability issues need to be addressed due to necessity of using hot water as reaction medium and high tendency of carbonaceous deposit formation on catalyst surface.The current review mainly focuses on efforts of catalytic site design and modification,including selection of metal/support,use of synergy between metal and support,tuning metal size,use of inverse catalysts,adding catalytic promoters,constructing bimetallic sites,etc.,to realize efficient,selective and stable production of bio-based monomers from furfural and hydroxymethylfurfural. | hirong Yang Jing Zhang Gang Qian Xuezhi Duan Xinggui Zhou | 2021 | Green Chemical Engineering2021，2，2： | 0 |
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