High-yield synthesis of quasi-MOF using synergistic modulated hydrothermal process for NH3-SCR of NOx

Abstract

Metal-organic frameworks (MOFs) hold immense promise for low-temperature denitrification (de-NO_x) owing to their tunable pore size and active sites, nevertheless, their practical application is impeded by low yields. In this investigation, we introduce a synergistic modulated hydrothermal (SMHT) method designed to cooperatively control pre-cluster and solution pH using acetic acid and N, N-dimethylformamide, with the aim of enhancing MOFs yields. The TEOS&Mn-BTC-HY catalyst synthesized by the method of SMHT successfully increased the yield from 21 % of the input to 63 % compared with the TEOS&Mn-BTC catalyst synthesized by the hydrothermal method. Characterization analysis and performance testing reveal that the structure of TEOS&Mn-BTC-HY is minimally affected by the SMHT method, and its performance remains excellent. The de-NO_x efficiency remained above 90 % in the temperature range of 90–300 ℃, and even under challenging conditions such as 6 % H₂O or 100 ppm SO₂ at 150 ℃ for 10 h, the performance still exceeded 90 %. The designed SMHT process offers valuable insights for expanding MOFs production and further advancing the application of MOFs in the realm of de-NO_x.