催化剂对竹废料微波裂解的影响

以竹材废料为原料,研究了微波裂解制备生物油及竹炭的可行性。探讨了在微波功率700 W,裂解温度550℃,裂解时间20 min的工艺条件下,焦炭、磷酸、KOH、NaOH和氯化锌等催化剂对裂解产物的影响。结果表明,KOH和磷酸是有效的催化剂,均能有效提高裂解液、固体产物得率,使竹炭表面含氧官能团显著增加。KOH催化后竹炭的吸附指标已达到了国家二级品标准(GB/T 13803.2-1999),而磷酸催化后竹炭的碘及亚甲基蓝吸附值分别是国家一级品标准(GB/T13803.2-1999)的1.04倍和1.56倍,不过所得生物油为强酸性,有待进一步研究改进。

Effects of catalyzer on microwave pyrolysis of bamboo residues

Feasibility of preparing bio-oil and bamboo-charcoal from bamboo residues by microwave pyrolysis was studied.The effects of catalyzers such as char,phosphoric acid,KOH,NaOH and ZnCl2 on pyrolysis products were determined under the condition of microwave power 700W,pyrolysis temperature of 550℃ and time of 20 mins.It showed that KOH and phosphoric acid were effective catalyzers,both could increase the yields of pyrolysis liquid and solid products,and as well as raised amount of surface functional group remarkably.The adsorption index of bamboo-charcoal catalyzed by KOH achieved the national second grade in GB/T 13803.2-1999 standard,while the iodine and methylene blue adsorption value of bamboo-charcoal catalyzed by phosphoric acid were 1.04 and 1.56 times of the national first grade in GB/T 13803.2-1999 standard,but the pyrolysis bio-oil obtained showed strong acidity,which was waiting for further studying.