Microporous materials exhibit fast CO₂ adsorption rate with possible sacrificed capacity, while CO₂ chemisorption on metal oxides is remarkable but kinetics and reactive area are critical. In order to adopt the advantages of both microporous sorbent zeolitic imidazolate framework (ZIF) and metal oxide (MO), in this research, magnesium oxide (MgO) and zinc oxide (ZnO) were doped to ZIF-8 (MO@ZIF) using infiltration and calcination processes. The powder X-ray diffraction patterns showed retained ZIF-8 integrity after MO addition. Broad MgO peaks implied well-dispersed nanoparticles, while sharp ZnO diffractions indicated oxide agglomeration, supported by the field emission transmission electron microscope images. ZIF pore size was expanded due to confined MgO without sacrificing the framework porosity. Because of nanoconfinement, the MgO@ZIF-8 room temperature CO₂ adsorption, as well as the adsorption rate constant in pseudo-second order model, were two-fold higher than expectation. In addition, the decarbonation temperature in MgO@ZIF-8 was reduced by 40 degrees. In general, it was found that metal oxide nanoconfinement in microporous zeolitic imidazolate frameworks performed improved CO₂ uptake, facilitated adsorption kinetics at ambient temperature, and lowered regeneration temperature to release CO₂.

微孔材料表现出快速的CO ₂吸附速率，可能会牺牲其容量，而CO ₂在金属氧化物上的化学吸附作用显着，但动力学和反应面积至关重要。为了利用微孔吸附剂沸石咪唑酸盐骨架（ZIF）和金属氧化物（MO）的优势，在本研究中，使用以下方法将氧化镁（MgO）和氧化锌（ZnO）掺杂到ZIF-8（MO @ ZIF）中渗透和煅烧过程。添加MO后，粉末X射线衍射图谱显示保留了ZIF-8完整性。宽的MgO峰暗示了纳米颗粒分散良好，而ZnO尖锐的衍射表明氧化物聚集，这由场发射透射电子显微镜图像支持。由于限制了MgO的存在，ZIF孔的尺寸得以扩大，而不会牺牲骨架的孔隙率。由于纳米约束，MgO @ ZIF-8室温CO ₂吸附以及伪二级模型中的吸附速率常数比预期高两倍。此外，MgO @ ZIF-8中的脱碳温度降低了40度。通常，发现在微孔沸石咪唑酸盐骨架中的金属氧化物纳米约束物改善了CO ₂吸收，促进了环境温度下的吸附动力学，并降低了再生温度以释放CO ₂。