Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials

Autor:	Ma. Antonia Lunagómez-Rocha, I. Cuauhtémoc-López, Juan Carlos Arévalo-Pérez, Adrián Cervantes-Uribe, Zenaida Guerra-Que, Alejandra Elvira Espinosa de los Monteros, J. G. Torres-Torres, Adrián Cordero-García, Adib A. Silahua-Pavón, Jorge Cortez-Elizalde
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	Technology Materials science Diffuse reflectance infrared fourier transform Scanning electron microscope Nanoparticle chemistry.chemical_element gold addition Article Nanomaterials Metal NiW/Al2-O3-CeO2-TiO2 nanomaterials recharge method Specific surface area Desorption General Materials Science Microscopy QC120-168.85 QH201-278.5 Engineering (General). Civil engineering (General) TK1-9971 Nickel Chemical engineering chemistry Descriptive and experimental mechanics visual_art visual_art.visual_art_medium Electrical engineering. Electronics. Nuclear engineering TA1-2040
Zdroj:	Materials Volume 14 Issue 19 Materials, Vol 14, Iss 5470, p 5470 (2021)
ISSN:	1996-1944
DOI:	10.3390/ma14195470
Popis:	NiWAu trimetallic nanoparticles (NPs) on the surface of support Al2O3-CeO2-TiO2 were synthesized by a three-step synthetic method in which Au NPs were incorporated into presynthesized NiW/Al2O3-CeO2-TiO2. The recharge method, also known as the redox method, was used to add 2.5 wt% gold. The Al2O3-CeO2-TiO2 support was made by a sol–gel method with two different compositions, and then two metals were simultaneously loaded (5 wt% nickel and 2.5 wt% tungsten) by two different methods, incipient wet impregnation and ultrasound impregnation method. In this paper, we study the effect of Au addition using the recharge method on NiW nanomaterials supported on mixed oxides on the physicochemical properties of synthesized nanomaterials. The prepared nanomaterials were characterized by scanning electron microscopy, BET specific surface area, X-ray diffraction, diffuse reflectance spectroscopy in the UV–visible range and temperature-programmed desorption of hydrogen. The experimental results showed that after loading of gold, the dispersion was higher (46% and 50%) with the trimetallic nanomaterials synthesized by incipient wet impregnation plus recharge method than with impregnation plus ultrasound recharge method, indicating a greater number of active trimetallic (NiWAu) sites in these materials. Small-sized Au from NiWAu/ACTU1 trimetallic nanostructures was enlarged for NiWAu/ACT1. The strong metal NPs–support interaction shown for the formation of NiAl2O4, Ni-W-O and Ni-Au-O species simultaneously present in the surface of trimetallic nanomaterial probably plays an important role in the degree of dispersion of the gold active phase.
Databáze:	OpenAIRE
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