固体超强酸C_3N_4-SO_4~(2-)的酸、光催化性能研究
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摘要
固体超强酸C_3N_4-SO_4~(2-)在合成乙酸乙酯的酯化反应中的酸催化性能,最佳的反应条件为乙酸和乙醇的摩尔比为1∶2、催化剂用量为0.7g、反应时间为1 h。酯化率最高可达到98.07%,催化效果好于浓硫酸,重复使用控制在4次以内酯化率都在80%以上。浸渍不同浓度硫酸铵溶液的固体超强酸对萘酚溶液降解的固体超强酸催化剂均具有光催化性能,浸渍液浓度为1.0 mol/L下制得的C_3N_4-SO_4~(2-)光催化剂对萘酚的降解效果最佳。
Through the research of the acid catalytic performance of solid superacid C_3N_4-SO_4~(2-) in the synthesis of ethyl acetate,the optimized reaction condition for the esterification is that the molar ratio of acetic acid and ethanol is 1 ∶2,the amount of catalyst is 0.7 g,the reaction time is 1 h. The best esterification rate reached98.07%,and the catalytic effect is better than concentrated sulfuric acid. The the esterification rate can be maintained as high as 80% after four recycling test. Through research of the effect of ammonium sulfate on the photocatalytic performance for degradation of naphthol solution,solid super acid catalyst prepared under different soaking concentration has good photocatalytic properties. Concentration of impregnation solution for1.0 mol/L C_3N_4-SO_4~(2-) system is optimized to be 1.0 mol/L.
Through the research of the acid catalytic performance of solid superacid C_3N_4-SO_4~(2-) in the synthesis of ethyl acetate,the optimized reaction condition for the esterification is that the molar ratio of acetic acid and ethanol is 1 ∶2,the amount of catalyst is 0.7 g,the reaction time is 1 h. The best esterification rate reached98.07%,and the catalytic effect is better than concentrated sulfuric acid. The the esterification rate can be maintained as high as 80% after four recycling test. Through research of the effect of ammonium sulfate on the photocatalytic performance for degradation of naphthol solution,solid super acid catalyst prepared under different soaking concentration has good photocatalytic properties. Concentration of impregnation solution for1.0 mol/L C_3N_4-SO_4~(2-) system is optimized to be 1.0 mol/L.
引文
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[2]唐宝华.乙酸乙酯的绿色合成研究[J].化学工程与装备,2010(07):35-36.
[3]冯喜兰,刘萍,赵旭娜.乙酸乙酯合成实验的改进[J].实验科学与技术,2010(03):15-16.
[4]李金磊,胡兵,张智.磷钼钒杂多酸的制备及其催化合成乙酸乙酯[J].化学与生物工程,2012(01):57-59.
[5]杜长海,邢华琼,孙德.负载型Mo O3催化剂的结构与催化酯化性能研究[J].精细化工,2010(08):779-783.
[6]李佩莹.固体酸催化剂研究近况综述[J].广州化工,2010(12):42-44.
[7]陶贤平,陶贤平,鄢翼鹏等.酯化反应催化剂的应用研究进展[J].云南化工,2012(04):15-18.
[8]薛俊礼,程振玉,吉惠杰等.三元稀土固体超强酸催化剂SO42-/Nd2O3-ZrO2-Fe2O3的制备工艺研究[J].吉林化工学院学报,2015(11):25-29.
[9]刘圣环,孟平蕊,于立娟等.磺酸型固体催化剂催化合成乙酸乙酯[J].化学工业与工程技术,2011(02):10-11.
[10]石文平,杨红英,李旭云.MxOy/SO42-类固体超强酸的制备方法[J]精细石油化工进展,2001(09):23-27.
[11]周煜磊,杨德龙,史广法等.合成乙酸乙酯方法的研究[J].实验室科学,2012(02):63-64.
[12]薛俊礼,刘海涛,吉惠杰等.三元固体超强酸催化乙酸乙酯合成工艺研究[J].吉林化工学院学报,2015(08):40-42.
[13]C Li,CB Cao,HS Zhu.Graphitic carbon nitride thin films deposited by electrodeposition[J].Materials Letters,2004(12/13):1903-1906.
[14]F Wang,WKH N,JC Yu.Red phosphorus:An elemental photocatalyst for hydrogen formation from water[J].Applied Catalysis B Environmental,2012:409-414.
[15]F Wu,Y Liu,G Yu.Visible-light-absorption in graphitic C3N4bilayer:Enhanced by interlayer coupling[J].Journal of Physical Chemistry Letters,2012(22):3330-3334.
[16]G Liao,S Chen,X Quan,et al.Graphene oxide modified g-C3N4 hybrid with enhanced photocatalytic capability under visible light irradiation[J].Journal of Materials Chemistry,2012(06):2721-2726.
[17]AY Liu,ML Cohen.Prediction of new low compressibility solids[J].Science,1989(4920):841-842.