Breakthrough dynamics of nitrogen, oxygen, and argon on silver exchanged titanosilicates (Ag-ETS-10)

Abstract

Breakthrough curves of N 2 , O 2 , and Ar on Silver exchanged titanosilicates (Ag-ETS-10) extrudates and granules were measured using a laboratory scale dynamic column breakthrough (DCB) apparatus. In order to investigate the dynamics of the mass transfer, effect of flow rate, temperature and pressure on the composition and temperature curves were studied. In a separate attempt, N 2 breakthrough curves on two columns filled with Ag-ETS-10 extrudates and granules with two different sizes were obtained. Influence of axial-dispersion, macropore, and film resistance within the column was investigated using fundamentals of mass transfer and fluid dynamics which assisted in classifying the dynamics of this separation. The experimental results indicated the rapid mass transfer and the potential for rapid cycles using Ag-ETS-10 for high-purity O 2 production. A fully predictive mathematical model was shown to describe the experimental curves to a high level of precision. Keywords Breakthrough experiment • Oxygen purification • Air separation • Titanosilicates Abbreviations b Parameter in Langmuir isotherm (m 3 mol −1) b 0 Parameter in Langmuir isotherm (m 3 mol −1) c Fluid phase concentration (mol m −3) C pa Specific heat capacity of the adsorbed phase (J mol −1 K −1) C pg Specific heat capacity of the gas phase (J mol −1 K −1) C ps Specific heat capacity of the adsorbent (J kg −1 K −1) C pw Specific heat capacity of the column wall (J kg −1 K −1) d Parameter in dual-site Langmuir isotherm (m 3 mol −1

A short review on recent advances in porous adsorbents for separation of oxygen from atmospheric air

“…Hejazi et al 60 measured the breakthrough curves of N 2 , O 2 , and Ar on Ag‐ETS‐10 extrudates and granules (with two different sizes) in a dynamic column apparatus. Prior to the experiments, adsorbent was activated for 16 h at 250°C under a N 2 environment.…”

“…It is noted that the AgLi-LSX is good adsorbent for N 2 sorption at 1 bar compared to Li-LSX. Ag-ETS-10 exhibited lower N 2 sorption; however, the Ar/O 2 selectivity is comparatively higher than Li-LSX and AgLi-LSX sorbents.Hejazi et al60 measured the breakthrough curves of N 2 , O 2 , and Ar on Ag-ETS-10 extrudates and granules (with two different sizes) in a dynamic column apparatus. Prior to the experiments, adsorbent was activated for 16 h at 250 C under a N 2 environment.…”

Marrying Materials and Processes: A Unified Optimization for Adsorption Processes

“…Gas separation and purification are widely used for many industrially important applications such as O 2 /N 2 , He/CH 4 , diene/olefin, and N 2 /CH 4 separation, to name a few. − To this aim, one of the well-established technologies used is adsorption-based separation processes, in which a solid sorbent is used to selectively adsorb a target gas while rejecting the others. , Two key design factors dictate the performance of any adsorption-based separation process, namely, the solid material, i.e., the adsorbent, and the process configuration, also known as the cycle. From the materials point of view, many organic and inorganic materials have been developed over the years to perform gas separation and purification. , In recent years, computational material discovery, advances in material synthesis (in the form of reticular chemistry), and material characterization have led to an exponential growth of new materials being reported for different applications. , From the process point of view, adsorption-based separation can be carried out in several different ways based on the technique used to regenerate the solid adsorbent.…”

Equilibrium Adsorption of Nitrogen, Oxygen, and Argon on Silver-Exchanged Hierarchical ETS-10

“…Many reports have published that Ag-zeolite and/or its combination, e.g. AgLi-LSX, AgCa-LSX, AgSr-LSX, Ag-CHA (Si/Al – 6.0), Ag-ETS-10, , and so on, is effective for Ar removal, which enhances O 2 purity. The main reason to use Ag is the π-bond electron donation of the N 2 molecule to the vacant s orbital of Ag + , and the backdonation of electrons from the d orbital of Ag to the vacant π-antibonding orbital of N 2 . , Therefore, Ag exchange over zeolite is mostly preferred for Ar/O 2 separation.…”