摘要
为回收工业废气中的PH3并资源化,通过容积法对比了2种活性炭在25℃下对PH3的饱和吸附容量,研究了不同温度下PH3气体在AC1上的等温吸附行为,利用Boehm滴定法测试了2种活性炭的表面酸性基团。结果表明,含酸性基团较多的AC1更有利于PH3的吸附,在实验条件范围内25℃、40℃、55℃、70℃下PH3在AC1上的饱和吸附容量分别为4.247 mg/g,2.750 mg/g,2.088 mg/g和1.527 mg/g。由Clausius-Clapeyron方程计算而得的等量吸附热很好地预测了各实验温度下的吸附等温线。PH3气体在AC1上的等量吸附热随吸附量的增大而减小,表明AC1表面能量的不均匀性。在实验条件下,PH3的等量吸附热小于30 kJ/mol,过程为物理吸附,便于PH3气体的解吸。
In order to recycle PH3 from industrial waste gas,the adsorption capacities of the two activated carbons were compared.Adsorption equilibrium data onto AC1 were carried out with the phosphine temperature ranged 25～70 ℃.The surface acidic groups of the two activated carbons were characterized by Boehm titration.The result shows that AC1 contained more acidic groups has higher adsorption capacity than AC2.The adsorption capacities of phosphine onto AC1 at different temperatures are as follows： 25 ℃（4.247 mg/g）〉40 ℃（2.750 mg/g）〉55 ℃（1.088 mg/g）〉70 ℃（1.527 mg/g）.The prediction of adsorption isotherm is accomplished by the isosteric heat of adsorption from Clausius-Clapeyron equation.And the prediction results are in good agreement with the experimental data.The isosteric heats of adsorption indicated that adsorptive phosphine removal performance may be a dominant of physical adsorption and CaCl2/5A molecular sieve had an energetically heterogeneous surface.All the results show that AC1 had excellent potential as an adsorption material for phosphine separation and recycle of phosphine.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第1期34-37,共4页
Journal of Wuhan University of Technology
基金
云南省中青年学术和技术带头人后备人才项目(2007PY01-10)
云南省教育厅科学研究重点基金(07Z11402)
云南省自然科学基金(2001E0011Q)
校引进人才基金(14118017)
昆明理工大学学生课外学术科技创新基金(2008BA081)
关键词
磷化氢
活性炭
吸附
等量吸附热
吸附等温线
phosphine
activated carbon
adsorption
isostefic heat of adsorption
adsorption isotherm
