二氧化硫低温等离子法改性粉煤灰固体酸催化剂及其催化木糖制糠醛性能OACSTPCD

Establishing a connection between active sites and supports using green and efficient methods is crucial for the construction of heterogeneous catalysts.The surface of industrial fly ash(CFA)was sulfurized through a sulfur dioxide(SO2)low-temperature plasma modification,resulting in a solid acid catalyst termed CFA-HSO3.This catalyst was then utilized for the conversion of xylose to furfural.Characterization of the samples was conducted using various techniques,including Fourier-transform infrared spectroscopy(FTIR),Brunauer-Emmett-Teller(BET)surface area and pore size analysis,organic elemental analysis(OEA),X-ray diffraction(XRD),and scanning electron microscopy(SEM).The yield of furfural in the catalytic reaction was enhanced by optimizing reaction conditions.The results indicate that the successful grafting of sulfur-containing functional groups onto the sample's surface after SO2 low-temperature plasma modification.This approach can also reduce the catalyst's preparation time.In a biphasic solvent system with a water-to-4-methyl-2-pentanone(MIBK)volume ratio of 1∶3,adding 0.6 g of xylose,0.2 g of NH4Cl,and 0.3 g of catalyst,and reacting at 190 ℃ for 20 minutes,the yield of furfural can reach 89.6%,which is 47.9%higher than that of pure water system.Furthermore,CFA-HSO3 exhibites excellent catalytic stability and reusability.This study introduces a green and efficient catalyst modification approach,offering a novel pathway for the preparation of furfural.