Metal–Organic Framework-Based Sustainable Nanocatalysts for CO Oxidation

Abstract

The development of new catalytic nanomaterials following sustainability criteria both in their composition and in their synthesis process is a topic of great current interest. The purpose of this work was to investigate the preparation of nanocatalysts derived from the zirconium metal–organic framework UiO-66 obtained under friendly conditions and supporting dispersed species of non-noble transition elements such as Cu, Co, and Fe, incorporated through a simple incipient wetness impregnation technique. The physicochemical properties of the synthesized solids were studied through several characterization techniques and then they were investigated in reactions of relevance for environmental pollution control, such as the oxidation of carbon monoxide in air and in hydrogen-rich streams (COProx). By controlling the atmospheres and pretreatment temperatures, it was possible to obtain active catalysts for the reactions under study, consisting of Cu-based UiO-66-, bimetallic CuCo–UiO-66-, and CuFe–UiO-6-derived materials. These solids represent new alternatives of nanostructured catalysts based on highly dispersed non-noble active metals.

Nanosilver-loaded metal–organic framework UiO-66 with strong fungicidal activity

“…A similar effect has been observed for UiO-66 impregnated with other transition metal precursors. 18…”

“…A similar effect has been observed for UiO-66 impregnated with other transition metal precursors. 18 In the case of the Ag/U(1) sample, it exhibited a release of both nitrate and citrate from 225 °C (Fig. 2a) whereas Ag 2 CO 3 was formed by the thermal decomposition of silver-citrate complex.…”

“…14 A MOF with attractive qualities to be used in this type of application is UiO-66 since it has hydrophilic characteristics, resists low pH, 15 has good thermal, chemical, and mechanical stability and low toxicity. 16 In addition, it has shown the ability to disperse transition metals in its structure, such as copper, cobalt, iron 17,18 and silver, 16,[19][20][21] while preserving its connectivity and structural integrity. These qualities have promoted the study of UiO-66 for microorganism control applications.…”

Removal of CO Generated by a Gas Explosion Using a Cu–Mn Elimination Agent

“…In recent years, there has been much research on the catalytic oxidation of CO with solid catalysts. Research has mostly been focused on the development, characterization, − and simple performance comparison of different catalysts. ,,, However, there is little research on the influence of environmental factors on catalytic performance. When conducting catalytic oxidation experiments, most researchers consider low-temperature catalytic oxidation − without considering the mine temperature after the gas explosion, the gas concentration, and other severe post-disaster conditions.…”

Application of New Nanoparticle Structures as Catalysts

“…The development of these MOF nanomaterials is, at present, one of the major subjects in fundamental research due to, among others, their potential applications as catalytic materials or as selective adsorbents. In the contribution by Zamaro et al [ 2 ], the preparation of nanocatalysts derived from the MOF named UiO-66, when used as support for three transition elements (Cu, Co, and Fe), is described. These materials are evaluated in two CO oxidations: oxidation with air and selective oxidation in a hydrogen-rich stream.…”