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New Catalyst To Help Carbon Dioxide Turn Waste Into Gold
May 13, 2018

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Recently, the national university of science and technology of China hefei microscale material science research center and professor of college of chemistry and materials science Ceng Jie team, through constructing the high load of oxaliplatin - molybdenum sulfide atomic dispersed catalyst, reveal the single-center neighbor atoms synergistic catalytic mechanism, and the synergy is through neighbor coordination between metal atoms of sulfur atoms.

The single atom catalyst has attracted extensive attention from researchers because of its unique properties, such as its high utilization rate, low coordination environment, and the strong interaction between metal and carrier.

At present, the research on the activity center of single atom system is confined to the isolated metal single atom site, or the interaction between the metal single atom and the carrier coordination atom.

But is there an interaction between a single atomic catalytic system that seems to be "independent"?

There is no clear answer to this question.

In order to solve this problem, researchers constructed for co2 hydrogenation to methanol platinum - molybdenum sulfide atomic dispersed catalyst, reveal a single atoms. There is also a neighbor in the catalytic system synergistic catalytic mechanism.

In this catalyst, the platinum atoms of the load replaced the molybdenum atoms in sulfide molybdenum, and each platinum atom and its corresponding sulfur atoms form a platinum-sulfur active center.

When two active central parts overlap or join together to form platinum-sulfur-platinum, two of the platinum atoms can be called a neighbor platinum single atom;

If the active center is not connected, it can be called isolated platinum single atom.

In the carbon dioxide hydrogenation reaction, the catalytic activity of the neighbor platinum single atom is higher than that of the isolated platinum single atom.

Researchers combined temperature programmed stripping, in situ infrared and X-ray photoelectron spectroscopy in three kinds of in situ characterization techniques, supplemented by density functional theory calculations, the different types of atoms in the carbon dioxide hydrogenation reaction mechanism.

The mechanism study found that the coordination sulfur atom between the neighboring platinum atoms (platinum-thioplatin) was able to dissociate the hydrogen, and as the adsorption site of the reactants and intermediates.

On isolated platinum single atoms, carbon dioxide does not undergo formic acid intermediates and is converted directly into methanol.

On the contrary, the neighboring platinum single atom can catalyze the hydrogenation of carbon dioxide and change the reaction path, so that the carbon dioxide is converted into formic acid, which is further hydrogenated to produce methanol.

For the first time, the new concept of "single-center neighbor atom co-catalysis" has been proposed, which breaks through the traditional understanding of non-interference between single atoms.

It is found that the synergistic effect of neighbor single atom is reflected by its coordination atoms.

The discovery of the study of single atom, and the study of single atom, has opened up new research direction for single atom catalysis.

The research has been funded by research projects of the Chinese academy of sciences' leading scientific research projects, national major scientific research projects, national natural science foundation, and hefei synchronous radiation source.

(hefei micro-scale material science national research center, University of Science and Technology of China chemistry and materials science institute, scientific research department)