CO2活化松木粉炭化的机理研究

Mechanism Study About Carbonization of Pine Powder Activated by CO2

从生物炭微观物理结构、碱金属迁移特性和微观化学结构三方面研究了CO2活化对生物炭表征结构的作用机理。研究发现活化炭微观物理结构在800℃活化工况下较原始生物炭表现为具有完整连续的孔系统,以及相对丰富的孔结构和比表面积;AAEM和Fe元素的迁移特性与活化温度密切相关,以K金属为代表的AAEM元素和Fe元素分别在800℃和700℃表现出各自最优的迁移特性;CO2的活化作用增加了活化炭表面含氧官能团浓度,但随着活化温度的升高C=O键受热分解,C-H键浓度增加。

In order to study the mechanism of CO2 activation on the biochar structure,this paper determine the microphysical structure,alkali metal migration characteristics and microchemical structure of biochar.This study found that the microscopic physical structure of activated carbon under the 800℃activation condition showed a complete and continuous pore system with a relatively rich pore structure and specific surface area.The migration characteristics of AAEM and Fe elements were closely related to the activation temperature,K and Fe elements exhibit their own optimal migration characteristics at 800℃and 700℃,respectively.The activation of CO2 increases the concentration of oxygen-containing functional group on the surface of activated carbon,but as the activation temperature increases,the C=O bond is thermally decomposed and the concentration of C-H bond increased.