Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

Abstract

A sol-gel technique was applied to prepare the two-component oxide system Cu-Mg-O, where MgO plays the role of oxide matrix, and CuO is an active chemical looping component. The prepared samples were characterized by scanning electron microscopy, low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reduction behavior of the Cu-Mg-O system was examined in nine consecutive reduction/oxidation cycles. The presence of the MgO matrix was shown to affect the ability of CuO towards reduction and re-oxidation significantly. During the first reduction/oxidation cycle, the main characteristics of the oxide system (particle size, crystallization degree, etc.) undergo noticeable changes. Starting from the third cycle, the system exhibits a stable operation, providing the uptake of similar hydrogen amounts within the same temperature range. Based on the obtained results, the two-component Cu-Mg-O system can be considered as a prospective chemical looping agent.

Ternary Ni-Ce-Mg-O Composites: In-Depth Optical Spectroscopy Study and Catalytic Performance in CO Oxidation

“…In our previous publications, a simplified approach based on sol-gel technology to prepare MgO-containing systems was proposed [40][41][42][43]. The main idea of this approach was to introduce the second and further components in the form of an aqueous solution of suitable precursors at the stage of magnesium methoxide hydrolysis.…”

Sol–Gel Technology Applied to Materials Science: Synthesis, Characterization and Applications

“…Karnaukhov et al [2] used the sol-gel technique to prepare the two-component oxide system Cu-Mg-O, where MgO acts as the oxide matrix, and CuO is an active chemical looping component. The reduction behavior of the Cu-Mg-O system was examined in nine consecutive reduction/oxidation cycles.…”