Dynamic bed measurements of CO adsorption on microporous adsorbents at high pressures for hydrogen purification processes

Abstract

a b s t r a c tRegarding the importance of adsorptive removal of carbon monoxide from hydrogen-rich mixtures for novel applications (e.g. fuel cells), this work provides a series of experimental data on adsorption isotherms and breakthrough curves of carbon monoxide. Three recently developed 5A zeolites and one commercial activated carbon were used as adsorbents. Isotherms were measured gravimetrically at temperatures of 278-313 K and pressures up to 0.85 MPa. Breakthrough curves of CO were obtained from dynamic column measurements at temperatures of 298-301 K, pressures ranging from 0.1 MPa to ca. 6 MPa and concentrations of CO in H 2 /CO mixtures of 5-17.5 mol%. A simple mathematical model was developed to simulate breakthrough curves on adsorbent beds using measured and calculated data as inputs. The number of parameters and the use of correlations to evaluate them were restricted in order to focus the importance of measured values. For the given assumptions and simplifications, the results show that the model predictions agree satisfactorily with the experimental data at the different operating conditions applied.

A supported Cu(I)@MIL-100(Fe) adsorbent with high CO adsorption capacity and CO/N2 selectivity

“…For adsorption-based separation, adsorbent is the core that directly determines the separation performance [9,10]. The reported CO adsorbents include zeolites [11,12], activated carbons [13][14][15], metal-supported adsorbents [8], and metal ion-based adsorbents [16][17][18].…”

Multi-physical continuum models of thermochemical heat storage and transformation in porous media and powder beds—A review

“…As the underlying concepts of reactive heat and mass transport are not limited to the application domain discussed here, the reader interested in details of the discussed modelling approaches may find inspiration also in contributions made in related fields of science and engineering. The following publications may serve as a guideline, albeit a rather selective one: combustion in porous media [56,57]; material manufacturing [58]; hydrogen purification [59,60] and the vast field of separation processes in general [61]; reaction engineering [50,62]; solar thermal reactors [63,64]; nuclear reactor safety [65,66]; and many others.…”

Simple Procedure to Estimate Mass Transfer Coefficients from Uptake Curves on Activated Carbons

“…Others apply solutions of the diffusion equation considering surface, macro‐ and micropore diffusion . More applied studies often estimate mass transfer coefficients by fitting simulated breakthrough curves to the experimental data , which rules out the predictive character of the simulation model.…”