Sun Yongbiao, Tang Jianfeng, Li Guangyan, Hua Yihuai, Li Hui, Hu Suyang
College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China.
College of Zhongran Engineering, Hebei Normal University, Shijiazhuang 050024, China.
ACS Omega. 2022 May 26;7(22):18542-18551. doi: 10.1021/acsomega.2c01211. eCollection 2022 Jun 7.
Efficient adsorbents are critical to the purification of liquefied natural gas (LNG) by the adsorption method. In this study, the physiochemical properties of JLOX-500 and 13X were examined. JLOX-500 with more Al content had a more compact unit cell, a larger surface area and pore volume, a smaller average pore size, and more microchannels on the surface than 13X. The separation performance of the two adsorbents was evaluated by the adsorption experiment. The CO adsorption capacity of JLOX-500 was higher than that of 13X, while the equilibrium and ideal selectivity and separation factor of CO/CH were also larger for JLOX-500. Especially in dynamic adsorption, the CO adsorption capacities at 50 ppm of the gas mixture at the outlet were 3.46 and 1.64 mmol/g for JLOX-500 and 13X, respectively. The adsorption heats of CO and CH on JLOX-500 were 40.50 and 18.77 kJ/mol, whereas these values were 31.49 and 18.50 kJ/mol for 13X, respectively. A better separation performance for JLOX-500 was observed because of fewer binders and a lower Si/Al ratio (1.34). The Toth adsorption isotherm model described best the experimental data. According to the results of this study, JLOX-500 was a more efficient adsorbent used in purification for LNG production at high pressure with low CO concentration.
高效吸附剂对于采用吸附法净化液化天然气（LNG）至关重要。在本研究中，对JLOX - 500和13X的物理化学性质进行了考察。与13X相比，Al含量更高的JLOX - 500具有更紧密的晶胞、更大的表面积和孔体积、更小的平均孔径以及更多的表面微通道。通过吸附实验评估了两种吸附剂的分离性能。JLOX - 500对CO的吸附容量高于13X，同时JLOX - 500对CO/CH的平衡选择性、理想选择性和分离因子也更大。特别是在动态吸附中，对于50 ppm的混合气体，JLOX - 500和13X在出口处的CO吸附容量分别为3.46和1.64 mmol/g。JLOX - 500上CO和CH的吸附热分别为40.50和18.77 kJ/mol，而13X的这些值分别为31.49和18.50 kJ/mol。由于粘结剂较少且Si/Al比更低（1.34），观察到JLOX - 500具有更好的分离性能。Toth吸附等温线模型能最好地描述实验数据。根据本研究结果，JLOX - 500是一种在高压、低CO浓度条件下用于LNG生产净化的更高效吸附剂。
