摘要
利用TG-FTIR联用技术研究了升温速率和催化剂（γ-Al2 O3，KCl和USY）对核桃壳热解失重特性和产物生成的影响，并对热解过程进行了动力学分析。结果表明，核桃壳热解主要失重发生在200~450℃，失重78%~82%；升温速率对热解特性的影响较大，随升温速率的增大，核桃壳热解转化率有所降低，热解起始温度及最大失重峰对应的温度向高温侧移动；核桃壳热解符合一级动力学模型，活化能为58~62 kJ/mol。热解的气态产物主要有CO2、H2 O、CO、CH4及酸、醛、酮等羰基化合物，催化剂不仅提高了核桃壳热解的转化率，而且改善热解产物的组成与分布。
The effects of heating rates and catalysts on the pyrolysis characteristics of walnut shell were studied using thermogravimetry analyzer coupled with Fourier transform infrared spectroscopy （ TG-FTIR）. The results showed that the main weight loss started at 200 ℃ and ended at 450 ℃,weight loss 78% ~82%. With increasing heating rates,the pyrolysis of walnut shell occurred at a higher temperature and the conversion decreased. FTIR results indicated that main gas products of pyrolysis were CO2 ,H2 O, CO,CH4 ,carbonyl compounds. Kinetic analysis showed that walnut shell pyrolysis could be simplified as a first-order reaction,and calculated activation energy was about 58~62 kJ/mol. Catalytic pyrolysis of wal-nut shell could not only increase the pyrolysis conversion,but also improve the volatiles distribution.
出处
《应用化工》
CAS
CSCD
2014年第12期2229-2233,共5页
Applied Chemical Industry
基金
陕西省科技统筹创新工程计划项目(2013KTZB01-04-02)
关键词
核桃壳
催化热解
动力学
TG-FTIR
walnut shell
catalytic pyrolysis
kinetics
TG-FTIR
