Selective catalytic reduction of NO with NH3 over HZSM-5-supported Fe–Cu nanocomposite catalysts: The Fe–Cu bimetallic effect

Synthesis of NiMo catalysts supported on mesoporous Al-SBA-15 with different morphologies and their catalytic performance of DBT HDS

“…To determine the strength and types of acid sites of these catalysts, pyridine IR spectroscopy measurements were performed at 200 and 350 • C. The pyridine adsorption IR spectra after degassing at 200 • C are assigned to the total amounts of acid sites, while the IR pyridine adsorption spectra after degassing at 350 • C are associated to the amounts of medium and strong acid sites. The band at 1540 cm -1 is attributed to pyridine adsorbed onto Brønsted acid sites, and the bands at 1450 and 1572 cm -1 are assigned to pyridine adsorbed onto Lewis acid sites, while the band at 1492 cm -1 is ascribed to a combination of Brønsted and Lewis acid sites [59][60][61]. Fig.…”

Self-sustained combustion of carbon monoxide promoted by the Cu-Ce/ZSM-5 catalyst in CO/O 2 /N 2 atmosphere

“…The reason for this may be that copper and cerium species cover the external surface of ZSM-5, blocking a number of zeolite channels, and impeding entry of N 2 into the pores. XRD patterns ( No diffraction peaks attributed to either copper or cerium oxides are observed, which suggests that the copper and cerium species are well dispersed on the ZSM-5 support [15,16].…”

Direct Synthesis of Hierarchical FeCu‐ZSM‐5 Zeolite with Wide Temperature Window in Selective Catalytic Reduction of NO by NH3

“…[22] While, the UV-vis DRS spectrum of FeCu-ZSM-5 has a dominant absorbance band at 250 nm due to the oxygen-to-iron charge transfer, indicating the existence of isolated Fe species which are introduced into the zeolite framework in tetrahedral coordination. [10,18,25] However, as accurate extinction coefficients are unknown and several peaks overlap complexity, it is too difficult to quantify the obtained metal species. [23d,24] The other one at about 208 nm observed in Cu/ZSM-5, Fe/Cu/ZSM-5, and FeCu-ZSM-5 is assigned to the charge transfer band related to O!Cu transition from lattice oxygen to isolated Cu 2 + ions, which is known to be active in the DeNOx process.…”