Construction of Cu-BTC by carboxylic acid organic ligand and its application in low temperature SCR denitration

The removal of NO has always been a hot issue in the treatment of coal-fired flue gas. In this paper, a hydrothermal synthesis method was used to prepare porous denitration catalysts with polycarboxyl organic isomers (trimellitic acid, phthalic acid, and benzoic acid). And then developed as the NO removing catalysts for low temperature selective catalytic reduction (SCR) with NH3. XRD, BET, SEM, FTIR, XPS, Raman, H-2-TPR, NH3-TPD and TG were used to analyze the crystallinity, microscopic morphology, surface functional groups and metal content. The results showed that: (1) From the crystal structure analysis, the catalyst prepared with 1,3,5 and 1,2,4-benzenetricarboxylic acid as ligands (1,3,5-A and 1,2,4-B) was Cu-BTC. (2) 1,3,5-A catalyst had a huge specific surface area, up to 1421.32 m(2)/g, and a pore volume up to 0.5798 cm(3)/g. (3) The prepared catalysts were applied to NH3-SCR denitration, and the catalyst with CuBTC structure had relatively high catalytic performance, and the overall catalytic capacity showed an increasing trend with the temperature. (4) 1,3,5-A catalyst had stability and catalytic activity. When the temperature was 270 degrees C, the denitration efficiency reached 83.87%. And within 8 h, the denitration efficiency was stable up to 82%.

Automated summary

In this study, porous denitration catalysts were prepared using a hydrothermal synthesis method with polycarboxyl organic isomers. These catalysts showed high catalytic performance and stability in low temperature selective catalytic reduction of NO. The study provided insights into the crystal structure, surface properties, and catalytic activity of the catalysts.