Carbon-based cobalt-palladium bimetallic nano-catalyst and preparation and application thereof

Abstract

The invention discloses a carbon-based cobalt-palladium bimetallic nano-catalyst as well as preparation and application thereof. The catalyst comprises a core-shell type substrate with a silicon dioxide nanosphere as a core and a carbon film as a shell, and metal nanoparticles of cobalt and palladium loaded on the carbon film. Herein, the spherical carbon shell is used as the substrate to load the metal nanoparticles, so that the metal nanoparticles are uniformly and finely dispersed on the substrate, the particle size is distributed between 3.5 nm and 5.5 nm, and the utilization rate of metal atoms is increased. By utilizing the plasma effect of metal palladium atoms, after photo-assisted thermocatalysis is introduced, the methanation reaction temperature is obviously reduced, and excellent catalytic performance can be obtained at 220 DEG C. The methane yield can reach 207.84 mmol / gmetal / h, the selectivity can reach 92.57%, and the CO2 conversion rate can reach 44.0% in 6 h in a sealed reactor.

Description

technical field [0001] The invention relates to the field of photothermocatalytic carbon dioxide reduction. More specifically, it relates to a carbon-based cobalt-palladium bimetallic nanocatalyst and its preparation and application. Background technique [0002] In recent decades, the continuous consumption of fossil fuels has led to severe global energy shortages and environmental problems. Addressing the serious twin problems of carbon dioxide emissions and the energy crisis has become a major global challenge. The carbon dioxide methanation technology proposed by Sabatier converts carbon dioxide into high value-added chemical products such as methanol and methane, which provides a good method for realizing the recycling of carbon resources and reducing anthropogenic climate change. However, due to the high thermodynamic stability and slow reaction kinetics of carbon dioxide, multiple electrons and protons are involved in the reduction and hydrogenation of carbon dioxid...

AI Technical Summary

Problems solved by technology

However, due to the high cost of precious metals, they are difficult to be used in industrial production on a large scale

Although the non-noble metals Co and Ni have good thermocatalytic methanation properties, their use usually requires high temperature (400 °C), which inevitably leads to high temperature sintering and carbon deposition of metal nanoparticles.

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