A series of trifluoroacetic acid (TFA) modulated metal-organic frameworks UiO-66 catalysts were synthesized for the direct synthesis of dimethyl carbonate (DMC) from CO₂ and methanol in this work. Characterization results show that the surface area, pore size, pore volume as well as the amount of missing-linker defects, Lewis acid site, Lewis basic site and hydroxyl of UiO-66-X can be tuned by regulating the amount of TFA modulator. Catalytic activity assessments reveal that TFA modulation enhanced the activity of UiO-66-X. The catalytic activity improvement of the UiO-66-X could be attributed to the increased amount of active sites and the enlargement of porosity originated from TFA modulation. Moreover, a possible reaction mechanism for DMC synthesis from CO₂ and methanol over UiO-66-X was proposed based on the in situ FT-IR results.

合成了一系列三氟乙酸（TFA）调节的金属有机骨架UiO-66催化剂，用于在此工作中从CO ₂和甲醇直接合成碳酸二甲酯（DMC）。表征结果表明，可以通过调节TFA调节剂的量来调节UiO-66-X的表面积，孔径，孔体积以及缺失的连接子缺陷的数量，路易斯酸位，路易斯碱性位和羟基。催化活性评估表明，TFA调节增强了UiO-66-X的活性。UiO-66-X催化活性的提高可归因于活性位点的增加和源自TFA调节的孔隙率的增加。此外，由CO ₂合成DMC的可能反应机理基于原位FT-IR结果，提出了甲醇在UiO-66-X上的应用。