Experimental and theoretical study on the reactivity of maghemite doped with Cu²⁺ in oxidation reactions: structural and thermodynamic properties towards a Fenton catalyst

Abstract

In this paper a new Fenton catalyst composed of iron oxide doped with a small amount of Cu was developed.

Comparative evaluation of Ni‐based bimetallic catalysts for dry reforming of methane at low temperature: The effect of alloy itself on performance

“…To investigate such interaction, the deconvolution of TPR profiles was conducted in this study. According to previous studies, the deconvolution of TPR profiles was used for detailed TPR analysis 41,42 . In particular, Pires and coworkers explained the effect of metal addition in the catalysts by deconvoluted TPR profiles 41 .…”

“…According to previous studies, the deconvolution of TPR profiles was used for detailed TPR analysis. 41,42 In particular, Pires and coworkers explained the effect of metal addition in the catalysts by deconvoluted TPR profiles. 41 In this study, each TPR profile of bimetallic catalysts was separated by the OriginPro software (Gaussian multiple peaks fitting), and it was compared with single metal catalysts' TPR profiles.…”

“…41,42 In particular, Pires and coworkers explained the effect of metal addition in the catalysts by deconvoluted TPR profiles. 41 In this study, each TPR profile of bimetallic catalysts was separated by the OriginPro software (Gaussian multiple peaks fitting), and it was compared with single metal catalysts' TPR profiles. Figure 4G-J shows the deconvoluted TPR profiles of bimetals compared with the TPR profile of single metals, and Table S1 provides information on the reduction temperature of each peak.…”

Reduction and Oxidation of Maghemite (001) Surfaces: The Role of Iron Vacancies

“…In Figure b, we compare the surface energies of the more stable maghemite B′ and SCV M surfaces with the magnetite and SCV ones, together with those of their reduced surfaces. Below, we show the range of oxygen chemical potentials corresponding to a range of pressure values, p , at the temperature, T = 300 K. At this temperature, experimental groups , have performed catalytic experiments concerning CO oxidation and hydrogen peroxide decomposition . The length of the vertical arrows at p = 1 atm represents the reducibility of the surfaces at this pressure.…”

“…Below, we show the range of oxygen chemical potentials corresponding to a range of pressure values, p, at the temperature, T = 300 K. At this temperature, experimental groups 43,44 have performed catalytic experiments concerning CO oxidation 43 and hydrogen peroxide decomposition. 44 The length of the vertical arrows at p = 1 atm represents the reducibility of the surfaces at this pressure. For the most stable maghemite and magnetite surfaces, B′ and SCV, the energy required to reduce the surface is less for the maghemite (∼18.4 meV/Å 2 ) than for magnetite surface (∼28.3 meV/Å 2 ).…”