Keywords
NiO particles
temperature programmed reduction
Temperature effect
water gas shift reaction
How to Cite
Abstract
In this work, the type of nickel oxide particles occurring on Al2O3 and ZnO-Al2O3 based supports were studied by different techniques, such as energy-dispersive X-ray spectroscopy, FTIR, BET method, X-ray diffraction (XRD) and Temperature Programmed Reduction (TPR). Solids were prepared at different temperatures and Ni/Zn molar ratios. The results showed the presence of NiO in all materials, as well as the presence of ZnO, NiAl2O4 and ZnAl2O4 in materials prepared at higher temperatures. In all the materials calcined at the lowest temperature, the formation of NiO particles that fail to interact with the supports was prioritized. As the calcination temperature increased, NiO aggregates were formed, which, to a greater degree, interact with the supports, whereby nickel aluminate was detected in all materials prepared at 750 °C. Zinc increased the selectivity, but decreased specific surface area and activity by means of the WGS reaction. The solid labeled as AZ15-500 showed higher activity and selectivity, reaching values of 100% for the WGS reaction.
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Copyright (c) 2023 Edgardo Meza-Fuentes, Johana Rodríguez Ruíz, Edinson Castellar Arroyo, Maria Rangel, Eduardo Espinosa Fuentes