摘要
以CaO·Mgo混合物为催化剂,采用热重分析法探讨了混合物中Mgo含量对生物油催化裂解反应速度和最终残留率的影响。实验结果显示,生物油的热重变化过程可以分为室温～200℃范围内的挥发阶段和200～520℃范围内的热裂解阶段。在热裂解阶段中,反应速率常数和温度的关系可以用Arrhenius方程式表示。在Mgo含量为50%的CaO·Mgo混合物的催化作用下,生物油热裂解反应活化能从无催化剂时的20.9kJ/mol降低到16.5kJ/mol,最终相对残留率降低到0.75。MgO含量为38.7%的煅烧白云石是有效的生物油裂解催化剂。
The effect of MgO content on reaction rate and final residual fraction in the catalytic cracking of bio-oil was studied thermogravimetrically, using the mixtures of CaO and MgO as catalysts. It was shown that the thermogravimetric change of bio-oil consisted of a volatile step at the temperature below 200℃ and a cracking step in the temperature range of 200 - 520℃. In the cracking step, the relationship between reaction rate constant and temperature could be expressed by an Arrhenius equation. The activation energy of bio-oil cracking reaction was 20.9 kJ/mol. The CaO/MgO mixture containing 50% of MgO reduced the activation energy to 16.5kJ/mol and the final relative residual fraction to 0.75. The calcined dolomite with 38.7% of MgO was an effective catalyst for cracking of bio-oil.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2008年第8期1034-1037,共4页
Acta Energiae Solaris Sinica
关键词
生物油
热裂解
白云石
热重分析
反应动力学
bio-oil
cracking reaction
calcined dolomite
thermogravimetric analysis
reaction kinetics
