Synthesis of zeolite molecular sieve 13X from coal-fired slag for efficient room temperature CO2 adsorption

Nitrogen-Enriched Carbon Aerogels Derived from Polybenzoxazine Cross-Linked Graphene Oxide-Chitosan Hybrid Matrix with Superior CO2 Capture Performance

“…The isosteric heat of adsorption ( Q st ) is the main factor to evaluate the strength of CO 2 and adsorbent surface interactions, which can be defined by the Clausius–Clapeyron equation as given in eq . ,,,− Therefore, the Q st values associated with the process of CO 2 adsorption using produced N-CAs have been computed. The adsorption measured data were fitted to the linear form of the Clausius–Clapeyron equation (refer to eq ) for various degrees of surface coverage (θ) at three diverse temperature points, namely, 25, 50, and 75 °C. , Q st = prefix− R true[ ∂ ln P ∂ true( true 1 T true) true] θ false( ln P ) θ = prefix− Q st R ( 1 T ) + C θ = n n max where P is the applied pressure in kPa; θ is the degree of surface coverage; Q st is the adsorption isosteric heat at a specified quantity of adsorbed CO 2 in J mol –1 ; R is the universal gas constant; T is the operating temperature in K; n and n max are the adsorbed amount at the applied pressure and the maximum of adsorbed amount, respectively; and C is the constant of integration.…”

“…The selectivity of CO 2 from gas mixtures is an important requirement for various applications of CO 2 separation systems . To anticipate the CO 2 /gas mixture selectivity, the ideal adsorbed solution theory (IAST) is often employed with single-component isotherms. , Therefore, the selectivity of the CO 2 /N 2 gas mixture was predicted by applying IAST for the pure component-sorption isotherms of each gas in the mixture.…”