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Updated: Jul 15, 2026

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
Evaluation of Ag-, Fe- and Ni-exchanged mordenite for the reduction of 4-nitrophenol under different reduction
Ikram Yssaad1, Fatiha Hamidi1, Denis Luart2
1Mohamed Boudiaf University of Science and Technology, Faculty of Chemistry, Laboratory of Functional and Nanostructured Ecomaterials El Mnaouar, BP 1505, Bir El Djir 31000 Oran Algeria ikram.yssaad@univ-usto.dz.
Abstract:
Mordenite (MOR) zeolite was hydrothermally synthesized and subsequently modified via ion exchange with Ag+, Fe3+, and Ni2+ ions. The resulting catalysts were evaluated for the reduction of 4-nitrophenol (4-NP) using two approaches: chemical reduction in the presence of NaBH4 and continuous-flow catalytic hydrogenation in an H-Cube Pro reactor (ThalesNano) using hydrogen generated by water electrolysis. The materials were comprehensively characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption at 77 K, X-ray fluorescence (XRF), infrared spectroscopy (FTIR), UV-Vis spectroscopy, and scanning electron microscopy (SEM). Characterization results showed that the mordenite framework remained intact after metal incorporation, although slight decreases in textural properties were observed. Among the catalysts, AgMOR exhibited the highest activity for the NaBH4mediated reduction of 4-NP, achieving 98% conversion, which is attributed to the high dispersion and accessibility of silver species within the zeolite channels. Under continuous-flow hydrogenation, AgMOR, NiMOR, and FeMOR achieved conversions of 89%, 92%, and 60%, respectively, demonstrating the benefits of continuous-flow operation and the critical role of metal-support interactions in determining catalytic performance.
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