The environmentally friendly insulating gas C

4

F

7

N has excellent insulating properties and has the potential to replace SF

6

as a gaseous insulating medium when mixed with the buffer gas CO

2

. And selecting suitable adsorption materials to adsorb the decomposition products of C

4

F

7

N gas mixture can ensure the safe and stable operation of environmentally friendly insulating gas in the equipment. In this paper

a gas adsorption experimental platform was constructed to investigate the adsorption performance of 13X molecular sieve on the four main carbo

n fluoride decomposition products of C

4

F

7

N gas mixture. At the same time

Its effect on the concentration of two major gases

C

4

F

7

N and CO

2

was also investigated. The adsorption performance of 13X molecular sieve on the gas mixture after the open break experiment was evaluated by observing the changes in the concentration of each carbon and fluorine decomposition product after the adsorption experiment. The experimental results show that 13X molecular sieve has strong adsorption performance on C

3

F

6

and C

3

F

8

with adsorption efficiency of more than 89%

however

its adsorption capacity for C

2

F

6

and CF

4

is weak

and its adsorption effect on CF

4

is not obvious. In addition

the concentrations of the main gas components C

4

F

7

N and CO

2

are affected to some extent after the experiment. In the mixed gas adsorption experiments

the 13X molecular sieve shows some adsorption capacity for C

3

F

6

and C

3

F

8

but it is not as efficient as the single gas adsorption

and the decomposition products of C

3

F

6

and C

3

F

8

in the mixed gas could be adsorbed and treated by increasing the amount of molecular sieve used.