Zn-Ca-Fe氧化物催化水解微晶纤维素

以尿素为沉淀剂制备了一系列复合金属沉淀物,将其在高温条件下煅烧获得一系列复合金属氧化物固体催化剂,并将其用于催化微晶纤维素的水解反应;考察了反应温度、反应时间、搅拌转速、催化剂用量和微晶纤维素用量对反应的影响。实验结果表明,在反应温度160℃、反应时间20 h、搅拌转速400 r/mnin、微晶纤维素2.0 g、Zn-Ca-Fe氧化物0.9 g和H_2O 200 mL的条件下,微晶纤维素的转化率高达42.56%,葡萄糖的收率为69.20%,且微晶纤维素水解液为中性溶液。在相同反应条件下,Zn-Ca-Fe氧化物可重复使用5次,其催化活性无明显降低。

Hydrolysis of Microcrystalline Cellulose over Zn-Ca-Fe Oxide Catalyst

A series of composite metal oxides were prepared through coprecipitation with urea as a precipitator and calcination at high temperature,and were used as catalysts in hydrolysis of microcrystalline cellulose to glucose.Performances of the catalysts in the hydrolysis were tested. Results showed that Zn-Ca-Fe oxide was an excellent catalyst.Under the reaction condition of temperature 160℃,reaction time 20 h,stirring speed 400 r/min,microcrystalline cellulose dosage 2.0 g,Zn-Ca-Fe oxide catalyst dosage 0.9 g and H₂ O 200 mL,conversion of microcrystalline cellulose and yield of glucose in the hydrolysis were 42.56%and 69.20%,respectively.The hydrolysate solution was still neutral after the reaction.The Zn-Ca-Fe oxide could be reused for 5 times under the above conditions without obvious catalyst deactivation.