Gold‐Loaded Nanoporous Iron Oxide Cubes Derived from Prussian Blue as Carbon Monoxide Oxidation Catalyst at Room Temperature

Abstract

This work reports the preparation of carbon monoxide (CO) oxidation catalysts based on gold nanoparticles supported on nanoporous iron oxide cubes. By heat-treating Prussian blue (PB) cubes at various temperatures between 250-450°C in air, nanoporous iron oxide cubes with surface areas up to 100 m 2 g À 1 are obtained. Owing to the relatively large surface area and nanoporous structure, the as-synthesized iron oxide cubes can be loaded with up to 11 wt% of Au nanoparticles without significant aggregation. When employed for CO oxidation, the Au-loaded nanoporous iron oxide cubes exhibit a high CO conversion rate of over 95% at room temperature under 0.1 L⋅min À 1 of CO gas flow, with specific activity of up to 1.79 mol CO ⋅g Au À 1 ⋅h À 1 . The high catalytic performance of the Au-loaded nanoporous iron oxide cubes for CO oxidation is contributed by various factors, including: (i) the high surface area of the iron oxide cubes which leads to the availability of more sites for the adsorption of oxygen molecules to react with carbon monoxide to generate more carbon dioxide (CO 2 ); (ii) the presence of nanopores which enhances the diffusivity of the reactant molecules during the catalytic reaction and improves dispersion of the deposited gold nanoparticles while also preventing their aggregation at the same time and (iii) the small size of the deposited gold nanoparticles (2-5 nm) which falls within the ideal size of gold nanoparticles for achieving high CO conversion.[a] S.

Catalytic Oxidation of Carbon Monoxide over CeO2 and La2O3 Oxides Supported Nickel Catalysts: The Effect of the Support and NiO Loading

“…The Arrhenius plots of CO reaction rates of catalysts are shown in Figure 6 and Table 3. It can be observed that the obtained values are in good agreement with those reported in the literature for CO oxidation [1,27,28] . It is worth noting that the values of activation energy change very significantly before and after reduction under H 2 atmosphere (Table 3) and varied according the same sequence of activity, before (20‐Ni/La (22 kJ/mol)<20‐Ni/Ce(48 kJ/mol)<5‐Ni/La(60 kJ/mol)) and after (5‐Ni/La(50 kJ/mol)∼20‐Ni/Ce(50 kJ/mol)<20‐Ni/La(74 kJ/mol)).…”

“…Carbon monoxide (CO)is a major sponsor to air pollution, it is the component of many use gases, such as sintering flue gas, exhausts of internal combustion engines… so on [1] . However, it is a very toxic gas for human health, animals and environment.…”

A Review on Iron Oxide‐Based Nanoarchitectures for Biomedical, Energy Storage, and Environmental Applications

“…Nanosized iron oxides are used as support materials for noble metal NPs in various catalytic applications owing to their high thermal and chemical stabilities, good durability, low toxicity, and easy preparation . The deposition of noble metal NPs onto iron oxide supports can be conveniently achieved using the deposition–precipitation method, in which small Au NPs are formed through the rapid reduction of gold(III) chloride using a strong reducing agent (e.g., sodium borohydride) .…”

Nanoporous Iron Oxide/Carbon Composites through In-Situ Deposition of Prussian Blue Nanoparticles on Graphene Oxide Nanosheets and Subsequent Thermal Treatment for Supercapacitor Applications

“…PB and PBAs have been utilized as precursors for the preparation of metal oxides with good electrochemical performance for energy storage applications by means of thermal decomposition [12]. In particular, iron oxides (Fe x O y ) have shown some promise as an electrode material for supercapacitors owing to their high theoretical specific capacitance, cost-effectiveness, low toxicity, excellent safety, and wide abundance [13,14]. In this work, we demonstrate the facile preparation of a PB/GO composite through the in-situ deposition of PB nanoparticles on GO nanosheets and the subsequent thermal treatment to convert the PB/GO composite to nanoporous Fe 2 O 3 /carbon composite (Scheme 1).…”