分子筛催化纤维素和淀粉转化制糠醛  

Catalytic conversion of cellulose and starch to furfural over zeolites

作　　者：郑洪岩 赵子龙 肖鲁青山 赵文诗 梁栩彬 薛彦峰 杨红 牛宇岚 朱玉雷[3] ZHENG Hong-yan;ZHAO Zi-long;XIAO Lu-qingshan;ZHAO Wen-shi;LIANG Xu-bin;XUE Yan-feng;YANG Hong;NIU Yu-lan;ZHU Yu-lei(Department of Chemistry and Chemical Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China;School of Chemical Engineering and Technology,North University of China,Taiyuan 030051,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China)

机构地区：[1]太原工业学院化学与化工系,山西太原030008 [2]中北大学化学工程与技术学院,山西太原030051 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《燃料化学学报》2021年第9期1261-1269,共9页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金青年项目(21908151);山西省高等学校科技创新项目(2019L0925)资助。

摘　　要：采用四种分子筛进行纤维素和淀粉催化转化反应,并借助X射线衍射、铝核磁、吡啶吸附红外光谱和NH_(3)-TPD等手段,对分子筛酸性质及孔道结构在催化纤维素和淀粉转化过程中的作用规律进行了研究。结果表明,Hβ分子筛上合适的B酸和L酸强度、数量及孔道结构使纤维素和淀粉主要反应生成糠醛。HY分子筛因酸性相对较弱,无法有效催化纤维素转化,但能有效催化淀粉生成5-羟甲基糠醛。H-mordenite和HZSM-5分子筛没有足够的L酸位,使纤维素和淀粉反应生成的葡萄糖无法异构为果糖,抑制了果糖进一步转化为糠醛或5-羟甲基糠醛的反应。5-羟甲基糠醛的生成取决于分子筛的酸性质,糠醛的生成除了由分子筛的酸性质决定,还需要合适的孔道结构。Conversion of cellulose and starch to furfural was investigated over four zeolites.The zeolites were characterized by X-ray diffraction,27Al MAS NMR,IR spectra of pyridine adsorption and NH_(3) temperatureprogrammed desorption.The roles of acidity and pore structure of zeolites in conversion of cellulose and starch were discussed in detail.The results showed that Hβzeolite with appropriate Brønsted acid sites,Lewis acid sites and pore structure was effective to produce furfural from cellulose and starch.HY zeolite could not catalyze cellulose reaction with high conversion because of its weak acidity.However,HY zeolite was effective to produce 5-hydroxymethylfurfural(HMF)from starch.H-mordenite and HZSM-5 zeolites with fewer Lewis acid sites could not cause the isomerization reaction from glucose to fructose.So,the further conversion of fructose to furfural or HMF was inhibited.The formation of HMF only depended on the acid properties of zeolites.The formation of furfural was not only determined by the acidity of zeolites,but also by their appropriate pore structure.

关 键 词：分子筛 纤维素 淀粉 糠醛 5-羟甲基糠醛 

分 类 号：O629.1[理学—有机化学] O626.1[理学—化学]