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采用化学还原法在不同单一和复配溶剂体系中制备了一系列NiCoB非晶态合金催化剂,对其液相糠醛加氢性能进行了考察,并采用N_2吸附-脱附等温线、ICP、FE-SEM、HRTEM、XRD、XPS等手段进行了表征。结果表明,在相同反应条件下,制备溶剂的表面张力、黏度、极性大小和溶解度常数等对NiCoB非晶态合金催化剂的组成、形貌和结构及其糠醛加氢反应性能均产生重要影响。由甲醇/乙二醇复配溶剂(MEG,体积比1∶1)制备的NiCoB-MEG催化剂具有最理想的糠醛液相加氢制糠醇性能,糠醛转化率达到96.4%,糠醇选择性达到83.49%,这可归因于甲醇和乙二醇之间的协同作用促进了金属组分的分散和还原。
A series of NiCoB amorphous alloy catalysts were prepared by chemical reduction method in different single and complex solvent systems. The hydrogenation properties of the liquid furfural were investigated. The adsorption and desorption isotherms of N 2, ICP, FE- SEM, HRTEM, XRD, XPS and other means were characterized. The results show that under the same reaction conditions, the surface tension, viscosity, polarity and solubility constants of the prepared NiCoB amorphous alloy catalyst have a significant effect on the composition, morphology and structure of the NiCoB amorphous alloy catalyst and the furfural hydrogenation reaction performance. The NiCoB-MEG catalyst prepared by the methanol / ethylene glycol complex solvent (MEG, volume ratio 1: 1) has the best furfural liquid-phase furfuryl alcohol conversion. The furfural conversion reaches 96.4% and the furfuryl alcohol selectivity reaches 83.49% , Which can be attributed to the synergy between methanol and ethylene glycol to promote the dispersion and reduction of the metal components.