Adsorption experiment
The purities of the acetylene, ethylene and carbon dioxide were higher
than 99.99%. Their adsorption isotherms were collected with an
Intelligent Gravimetric Analyser (IGA 001, Hiden, UK). Samples were
activated under vacuum at 150 °C overnight or until no further weight
loss was observed. Adsorption equilibrium data was collected once a
stable pressure (more than 20 adsorption points were recorded from 0 to
1 bar) and weight was maintained for at least 40 min to reach an
adsorption equilibrium at each point along the isotherm.