摘要
在H_(2)O_(2)体系下以Keggin型多金属氧酸盐为催化剂,催化降解木质素为酚类化合物,比较了4种不同氧化性的Keggin型多金属氧酸盐的催化性能。实验结果表明:H_(2)O_(2)体系下,H_(3)PW_(12)O_(40)和H_(5)PMo_(10)V_(2)O_(40)对木质素解聚具有良好催化效果,在温度140℃,1 mL H_(2)O_(2),1 h的条件下,H_(3)PW_(12)O_(40)为催化剂时生物油产率54.60%,单酚类化合物总产率可达6.38%;在温度140℃,2 mL H_(2)O_(2),1 h的条件下H_(5)PMo_(10)V_(2)O_(40)为催化剂时生物油产率60.96%,单酚类化合物总产率可达11.67%。与HPW对比,强氧化性PMo_(10)V_(2)在H_(2)O_(2)体系下,可显著提高单酚类化合物的产率。对反应产物进行了FT-IR,2D-HSQC,GC-MS等一系列表征分析证明该体系在解聚木质素为酚类化合物中具有有效性。
The catalytic performance of four keggin-type polyoxometalates with different oxidability to degrade lignin into phenolic compounds in H_(2)O_(2) system was compared.H_(3)PW_(12)O_(40) and H_(5)PMo_(10)V_(2)O_(40) catalysts had good effect on the depolymerization of lignin.Under the conditions of 140℃,1 mL H_(2)O_(2),1 h,the yield of bio-oil could reach 54.60% by using H_(3)PW_(12)O_(40) as catalyst,and the total yield of phenolic compounds could reach 6.38%.By using H_(5)PMo_(10)V_(2)O_(40) as catalyst,the yield of bio-oil could reach 60.96% and the total yield of monophenol compounds could reach 11.67% at 140℃,2 mL H_(2)O_(2) and 1 h.Compared with HPW,PMo_(10)V_(2) could significantly increase the yield of monophenols in H_(2)O_(2) system due to its strong oxidizing ability.A series of characterizations such as FT-IR,2D-HSQC,and GC-MS were performed to prove the effectiveness of the system in depolymerizing lignin into phenolic compounds.
作者
尉宁馨
段喜鑫
徐文彪
时君友
WEI Ningxin;DUAN Xixin;XU Wenbiao;SHI Junyou(Beihua University College of Materials Science and Engineering,Jilin 132013,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2022年第6期55-63,共9页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31971616,32001282)
吉林省科技发展计划项目(20200403171SF)。
关键词
木质素
杂多酸
氧化降解
酚类化合物
lignin
heteropoly acid
oxidative degradation
phenolic compound
