Catalytic Performance of MIL‐88B(V) and MIL‐101(V) MOFs for the Selective Catalytic Reduction of NO with NH₃

Abstract

In this paper, the SCR properties of MIL‐88B(V) and MIL‐101(V) MOFs materials by hydrothermal synthesis were investigated, and the effect of the coordination and spatial topology of MOFs materials on the coordination state, chemical state and surface properties of V ions, as well as the relationship with SCR catalysis, were discussed. The results showed that the NO conversion of MIL‐88B(V) can be as high as 80 %, while those of MIL‐101(V) can only reach to 20 %, but the SCR reaction selectivity of both were excellent. The coordination structure and spatial topological structure of MOFs materials had a great influence on the coordination state, chemical state and surface properties of V ions, resulting in different SCR catalytic performance. The reaction performance of SCR was related to the structural properties of V3Ox units and followed the E‐R mechanism. The staggered and layer upon layer close‐packed structure of MIL‐88B(V) made the density of V3Ox unit cluster higher and the distance of adjacent V3Ox unit cluster smaller. More V5+ ions and V−O−V bonds can form more Brønsted acid sites, also was conducive to the progress of the SCR reaction. Although MIL‐88B(V) has insufficient high temperature stability, but its good SCR reaction selectivity and SCR catalytic performance at medium and low temperature can still have the application prospect of medium and low temperature industrial denitration in non‐electric industries.

The introduction of Mn component improves the selectivity of NO adsorption separation in simulated flue gas of Co‐MOF‐74 at ambient conditions

“…Consequently, they are considered ideal for various gas storage applications. [4][5][6][7][8][9] MOF-74 material has a high density of potential unsaturated metal sites (OMS) in the framework, 10 and the OMS in materials enhance ligand binding of NO or other guest molecules, improving their storage capacity, 11,12 but such Al-MIL-53 has no unsaturated metal site and low NO adsorption capacity. 13 There is a good adsorption interaction between Co-CPO-27 and NO molecules, and the adsorption of NO by Co-CPO-27 is about 6 mmol/g under normal conditions, and the adsorption occurs on the unsaturated metal sites.…”

Bimetal NiCo-MOF-74 for highly selective NO capture from flue gas under ambient conditions

“…It has the advantages of high specic surface area, large porosity, diversied and adjustable pore structure, so it has been widely studied and applied. [4][5][6] M-MOF-74 (M = Mg, Co, Ni, Zn, Mn, Fe) series materials are composed of divalent metal ions and 2,5-dihydroxyterephthalic acid (DOBDC) organic ligands, and have a threedimensional honeycomb structure with a large number of open metal sites in the pores, which have been widely studied in the eld of gas adsorption separation and show excellent gas adsorption and separation properties. [7][8][9][10][11] The unique secondary structural unit of MOF-74 has stronger fault tolerance to polymetals, 12 so it is an ideal object for the study of polymetallic MOFs materials.…”

Investigation of Mn Promotion on HKUST‐1 Metal‐Organic Frameworks for Low‐Temperature Selective Catalytic Reduction of NO with NH3

“…Still, metal-organic frameworks are scarcely reported for NH 3 -SCR, and only several reports may be found in this research area. [11,12,21,[13][14][15][16][17][18][19][20] HKUST-1 is one of the most popular MOFs used for adsorption, air purification, and gas separation of molecules such as NH 3 , [22] H 2 O, [23] CO 2 , [24] CH 4 , or H 2 . [25] HKUST-1 has been reported for the first time in 1999.…”

“…Their enhanced textural features (high S BET and tunable pore size), very good adsorption properties, and proper acidity make them good candidates for catalysis field. Still, metal‐organic frameworks are scarcely reported for NH 3 ‐SCR, and only several reports may be found in this research area [11,12,21,13–20] . HKUST‐1 is one of the most popular MOFs used for adsorption, air purification, and gas separation of molecules such as NH 3 , [22] H 2 O, [23] CO 2 , [24] CH 4 , or H 2 [25] .…”