Question

Discuss the effect of temperature and pressure on the adsorption of a gas on a solid surface?

Answer 1

Physical Adsorption or Physisorption. ... An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Increase in temperature increases physisorption.




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Answer 2

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Adsorption of gases a=on solids are highly affected by change in pressure and temperature.

Adsorption increases with increase in pressure.
Effect of temperature depends on the nature of adsorption. In case of physical adsorption it decreases with increase in temperature because it is an exothermic process. In case of chemical adsorption, it first increases and then starts decreasing with increase in temperature. This is because activation energy is requires in starting but once the reaction i.e. chemical adsorption is started, it starts decreasing on further increase in temperature because it is also exothermic.

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