Probing the core and surface composition of nanoalloy to rationalize its selectivity: Study of Ni-Fe/SiO2 catalysts for liquid-phase hydrogenation

In situ study of the evolution of NiFe nanocatalysts in reductive and oxidative environments upon thermal treatments

“…Furthermore, aer exposure to air, the study of the reactivation of this nanocatalyst under H 2 also showed the benecial role of Ni in the reduction of Fe. 28 A parallel can be drawn with the benet of adding NiO to iron oxides in order to ease their reduction that has been documented for bulk 38,39 and nanomaterials. 32 It is assumed that NiO is rst reduced into Ni, which then catalyzes the reduction of iron oxides, 40 leading to NiFe alloys with an increasing Fe content upon increasing the reduction time.…”

“…These conditions were selected based on a previous study on NiFe nanocatalysts prepared by deposition-precipitation with urea (DPU). 28 The proportions of the different Fe and Ni species were determined by a multivariate data analysis (see the Experimental section and ESI for details †). Initial state.…”

Strengthening the Connection between Science, Society and Environment to Develop Future French and European Bioeconomies: Cutting-Edge Research of VAALBIO Team at UCCS

“…While monometallic Ni is known to promote undesirable side reactions of hydrogenation and ring opening, Fe-Ni bimetallic catalysts have shown interesting properties for the selective hydrogenation of alcohol and aldehyde groups [57]. Fe-Ni/SiO 2 catalysts were tested in the liquid-phase furfural hydrogenation reaction at 150 • C under 20 bar H 2 [58,59]. The conversion of furfural increased rapidly with an increasing Ni content.…”

“…For catalysts with Ni content in the active phase lower than 84 wt.%, FFA is mainly consumed in the hydrogenolysis reaction to MF, in the slower etherification reaction to iPrOMF, and in the furan ring hydrogenation reaction to THFFA. For catalysts with a Ni content in the active phase higher than 84 wt.%, FFA is consumed mainly by etherification to iPrOMF, by the slower second hydrogenolysis route to MF and by the even slower hydrogenation of the furan ring to THFFA [59].…”

Getting Greener with the Synthesis of Nanoparticles and Nanomaterials

“…The explosion in academic and industrial interest in these materials over the past decade arises from the remarkable variations in their electrical, optical, magnetic, and catalytic properties. Different methods have been used to synthesize metallic nanoparticles [ 4 , 5 , 6 ]. The most important are (i) chemical reduction, which involves the reduction of metal salts in solution or suspension by reducing agents; (ii) thermal decomposition by heating volatile metal compounds in an organic medium or gas phase, causing their degradation with the release of metals or their oxides in the dispersed phase; (iii) chemical vapor deposition in which the vaporized precursors are adsorbed onto a substance held at an elevated temperature; (iv) ultrasonic and microwave irradiations in which the direct interaction between microwaves and materials and this fact enables a uniform and fast heating of a sample; and (v) electrochemistry methods in which the particle size can be controlled by varying the electrical density, temperature, solvent polarity, and the distance between the electrodes.…”