糠醇树脂基介孔炭球合成及在1,2-二氯乙烷催化裂解中的应用

Synthesis of furan resin-based mesoporous carbon spheres andapplication in EDC catalytic cracking

糠醇树脂聚合后具有疏水性,在介孔的引入中难以将亲水性的二氧化硅等模板剂直接用于介孔球炭的合成,为了解决这一问题,本文通过对正硅酸乙酯水解条件的调控制备了一系列不同粒径的二氧化硅纳米粒子,对其进行疏水性修饰后作为硬模板成功引入聚糠醇树脂小球中,制备得到不同孔径的糠醇树脂介孔炭球.利用固体核磁(NMR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和红外光谱(FTIR)等表征分析介孔炭球合成过程中的结构特征.在1,2-二氯乙烷(EDC)催化裂解制氯乙烯反应中,积炭优先在微孔内产生,介孔结构可容纳更多的积炭,提升催化剂的抗积炭性能,同时介孔结构球炭比微孔球炭表现出更好的稳定性.

Furfuryl alcohol resin exhibits hydrophobicity after polymerization,making it challenging to directly use hydrophilic silica templates in the synthesis of mesoporous carbon spheres.To address this issue,a series of silica nanoparticles with different particle sizes were prepared by adjusting the hydrolysis conditions of tetraethyl orthosilicate.Following hydrophobic modification,they were successfully introduced as hard templates into polyfurfuryl alcohol resin spheres to prepare mesoporous carbon spheres with different pore size.The structural characteristics during the synthesis of mesoporous carbon spheres were characterized and analyzed using solid-state nuclear magnetic resonance(NMR),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and infrared spectroscopy(FTIR).In the catalytic cracking of ethylene dichloride(EDC)to produce vinyl chloride monomer(VCM),the introduced mesoporous structure demonstrated better reaction stability and performance to the microporous structure in enhancing catalyst stability due to its resistance to carbon deposition.