Table 14.

Comparison of adsorption techniques

Techniques	Advantages	Disadvantages
Breakthrough	Highly flexible	Inappropriate for collecting large data sets
	User friendly	Relatively expensive
	Easy to use even in the scale of less than gram	Requires highly accurate detectors
	Employed technique for developing cyclic adsorption processes	Requires precise knowledge on the dead volume of fixed-bed column
Gravimetric	The most direct adsorption technique	Only proper for pure gas adsorption
	The opportunity of adsorption screening in the milligram scale	Influenced by buoyant effects
	The potential of highly reliable values for high-pressure experiments	Getting the gravimetric equilibrium data may last hours or even days
		The cost and sophistication of system
Volumetric	Simplicity	Acquiring precise equilibrium data strongly relies on well calibrating/knowing different volumes of apparatus
	It can be provided commercially or in-house built	Generally, getting the equilibrium values may last hours or even days
	In-house built units can be developed with low budgets	More popular for pure gas adsorption assessment
	The most common technique for collecting large data sets of equilibrium values
Volumetric-Gravimetric	Extremely high accuracy	Some complexity for doing the experiments
	Proper for multi-component gas adsorption	Commonly, a large volume of adsorbent is required
	Favorable method for industrial applications	Relatively an expensive technique