Adsorption of Carbon Dioxide, Methane, and Nitrogen Gases onto ZIF Compounds with Zinc, Cobalt, and Zinc/Cobalt Metal Centers
Adsorption of Carbon Dioxide, Methane, and Nitrogen Gases onto ZIF Compounds with Zinc, Cobalt, and Zinc/Cobalt Metal Centers
复制标题
DOI：
10.1155/2019/6130152
复制
发表时间：
2019-12
影响因子：
--
通讯作者：
Ahmed Awadallah‐F;F. Hillman;S. Al‐Muhtaseb;Hae‐Kwon Jeong
中科院分区：
文献类型：
--
作者：
Ahmed Awadallah‐F;F. Hillman;S. Al‐Muhtaseb;Hae‐Kwon Jeong
ZIF-8、Co-ZIF-8和Zn/Co-ZIF-8在25 ~ 55℃的温度和~1 MPa的压力下用于吸附氮气（N2）、甲烷（CH4）和二氧化碳（CO2）气体。研究了平衡吸附等温线和吸附动力学。采用二元Langmuir方程来描述非等温吸附平衡行为。总的来说，N2在三种样品上的平衡吸附量最低，而CO2的平衡吸附量最高。ZIF样品中，N2和CH4在Zn/Co-ZIF-8上的吸附量最大，CO2在ZIF-8上的吸附量最高。测定了这些气体在ZIF-8、Co-ZIF-8和Zn/Co-ZIF-8上吸附的等等热。此外，还研究了不同温度下吸附的总传质系数。
ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 are utilized in adsorbing nitrogen (N2), methane (CH4), and carbon dioxide (CO2) gases at temperatures between 25 and 55°C and pressures up to ~1 MPa. Equilibrium adsorption isotherms and adsorption kinetics are studied. The dual-site Langmuir equation is employed to correlate the nonisothermal adsorption equilibrium behavior. Generally, N2 showed the lowest equilibrium adsorption quantity on the three samples, whereas CO2 showed the highest equilibrium adsorption capacity. Amid the ZIF samples, the biggest adsorption quantities of N2 and CH4 were onto Zn/Co-ZIF-8, whereas the highest adsorption quantity of CO2 was on ZIF-8. The isosteric heats of adsorbing these gases on ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 were examined. Moreover, the overall mass transfer coefficients of adsorption at different temperatures were investigated.