Both carbon monoxide and carbon dioxide are oxides of carbon, but many of the properties of these two gases are different, making the applications of these two gases very different. In comparison of activation, the former is more active for the following reasons:
At present, there are many researches on the activation of carbon monoxide, such as CO oxidation, water vapor change, Fischer-Tropsch synthesis, etc., but the research on the activation of carbon dioxide is much less. Generally, carbon dioxide is more stable and difficult to activate in terms of kinetics and thermodynamics.
"From the perspective of molecular structure and bond energy, the carbon-oxygen bond bond length in CO is 113pm, the bond energy is 1072KJ/mol, the carbon-oxygen bond bond length in CO2 is 116pm, and the bond energy is 803KJ/mol. Carbon monoxide is more stable based on the data of bond energy bond length, but carbon dioxide is a non-polar linear molecule, and carbon monoxide is a linear polar molecule. However, due to the existence of feedback bonds, the polarity of CO is very weak. The non-polar stability is higher, so that the carbon dioxide is more stable.
There is also a difference in the ability of metal to adsorb the two: CO adsorption is better on most metals, while CO2 has a weaker capacity, and there are surplus electrons in C in CO, while electrons in C in CO2 are more stable and neither It is easy to lose and not easy to get. In this respect, the activity is also different. Catalyst adsorption for carbon monoxide is mainly activated by the coordination of carbon atoms and metal atoms, while carbon dioxide is difficult to adsorb on the metal surface.
In summary, the former is more active for carbon monoxide and carbon dioxide.
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