Abstract
Carbon monoxide (CO) and hydrocarbons (HCs) generally have competitive adsorption on the active site of noble-metal nano-catalysts, thus developing an effective way to reduce the passivation of competitive reaction with each other is an urgent problem. In this study, we successfully synthesized transition metal-noble metal (Pt-M) alloys via introducing inexpensive metal elements (M = Ni, Co and Cu) into Pt particles and then deposited on alumina support to form Pt-based catalysts. Subsequently, we choose CO and toluene as polluting gases to evaluate the catalytic activities of Pt-M/Al2O3 catalysts. Introducing inexpensive metal elements (M = Ni, Co, and Cu) significantly changed the physicochemical properties and catalytic activities of these Pt-based catalysts. It can be found that the Pt-Co/Al2O3 catalyst exhibited outstanding catalytic activity for CO and toluene oxidation under mixed gas atmosphere, compared with other Pt-based catalysts, which is due to the higher dispersity, more surface adsorption oxygen, and well redox ability. Surprisingly, H2O could promote the catalytic activities for CO/toluene co-oxidation over the Pt-Co/Al2O3 catalyst. Thus, the present synthetic strategy not only opens an avenue towards the synthesis of noble metal-based catalysts, but also provides an excellent tolerance to H2O in the catalytic process.
Highlights
In recent years, with the progress of industrial development and the increased number of vehicles, the concentration of carbon monoxide (CO) and hydrocarbons (HCs) in ambient air is on the rise, causing the frequent occurrence of photochemical smog pollution in some areas and seriously threatening people’s health [1,2,3,4,5,6,7,8,9]
We reported a facile synthetic strategy to form bimetallic Pt-M (M = Ni, Co and Cu) catalysts for simultaneous CO and toluene oxidation, in which both transition metal and noble Pt metal were introduced onto an alumina support
It can be found that H2 O promotes the catalytic activities for CO/toluene oxidation over the Pt-Co/Al2 O3 catalyst
Summary
With the progress of industrial development and the increased number of vehicles, the concentration of carbon monoxide (CO) and hydrocarbons (HCs) in ambient air is on the rise, causing the frequent occurrence of photochemical smog pollution in some areas and seriously threatening people’s health [1,2,3,4,5,6,7,8,9]. Sato et al [28] prepared a γ-Al2 O3 -supported Pt-Co bimetallic catalyst [Pt(0.1)Co(1)/Al2 O3 ] for purification of automotive exhaust, the electron-rich Pt and metallic Co promoted the adsorption and activation steps of the reactions with NO, CO, and hydrocarbons. It is ideal for studying bimetallic Pt-based catalysts via introducing inexpensive metal elements for CO and toluene oxidation. H2 O promoted the catalytic activities for CO/toluene oxidation over the Pt-Co/Al2 O3 catalyst
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