A Principle for Highly Active Metal Oxide Catalysts via NaCl-Based Solid Solution

Abstract

For industrial catalysis, a simple and green process for catalyst synthesis has always been pursued. In this regard, we utilized NaCl, one of the most common salts, as a template to prepare transitional metal oxide catalysts with both abundant porosity and well-dispersed noble metal species. Interestingly, this dispersion by NaCl was realized by solid-state grinding. Importantly, those catalysts afforded excellent performance in redox processes.

Entropy‐stabilized metal‐CeOx solid solutions for catalytic combustion of volatile organic compounds

“…The success of entropy‐stabilized alloys and oxides inspires us to induce more divalent cations into CeO 2 by tuning entropy term. In this regard, CeO 2 catalyst—highly doped with 10 mol% Cu 2+ , 10 mol% Co 2+ , 10 mol% Mg 2+ , 10 mol% Ni 2+ , and 10 mol% Zn 2+ cations—is rationally designed, and simply prepared by mechanochemistry 44 . As expected, the entropy‐stabilized CeO 2 is found to possess abundant reactive oxygen species, favorable lattice distortions and low redox temperature.…”

Recent advances in mechanochemical synthesis of mesoporous metal oxides

“…Recently, a general route was reported for a facile environmentally-friendly synthesis of diverse porous metal oxides and the corresponding supported metal oxides with well-dispersed noble metal nanoparticles based on mechanochemically-assisted salt templating. 86 The synthesis procedure afforded transition metal oxides such as Co 3 O 4 , Fe x O y , and Cr 2 O 3 by performing an initial solvent-free ball milling of NaCl particles with transition metal precursors for 0.5 h to prepare solid solution and further 0.5 h milling after the addition of NaOH. The subsequent steps calcination in air and washing in water led to mesoporous metal oxides with SSA up to 224 m 2 /g (Fig.…”

“…Co 2 O 3 . Reproduced with permission from Ref 86. Copyright © 2020 Elsevier Inc.Elsewhere, polyoxometalates (POMs) have been shown as efficient bifunctional templates for the synthesis of mesoporous oxides with reactive surfaces 87.…”

Fabrication of Pd/Mg2P2O7 via a Struvite‐Template Way from Wastewater and Application as Chemoselective Catalyst in Hydrogenation of Nitroarenes

“…Noble metals would facilitate such reactions. The strong interaction between noble metals and nitro aromatics would determine the pathway of hydrogenation [13,14] . The support was also found to have a great influence on electron withdrawing capacity [15] .…”

“…The strong interaction between noble metals and nitro aromatics would determine the pathway of hydrogenation. [13,14] The support was also found to have a great influence on electron withdrawing capacity. [15] The interfacial contact induced by strong metal-support bonds would make electrons redistributed and impart favorable environments for catalysis.…”