Tapered element oscillating microbalance (TEOM) studies of isobutane, n-butane and propane sorption in β- and Y-zeolites

A TEOM is used to elucidate the adsorption/desorption characteristics of alkylation reactants on USY- and β-zeolites. Equilibrium adsorption isotherms were obtained on USY- and β-zeolites using n-butane, isobutane and propane as proxy reactant molecules (T = 303-398 K, adsorbate partial pressure 0-1...

Full description

Saved in:
Bibliographic Details
Published in:AIChE journal 2010-05, Vol.56 (5), p.1285-1296
Main Authors: Gong, Kening, Subramaniam, Bala, Ramachandran, Palghat A, Hutchenson, Keith W
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Chemical engineering
Desorption
Diffusion
Exact sciences and technology
Mathematical models
Microorganisms
Propane
Reactors
Sorption
TEOM
Zeolites
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A TEOM is used to elucidate the adsorption/desorption characteristics of alkylation reactants on USY- and β-zeolites. Equilibrium adsorption isotherms were obtained on USY- and β-zeolites using n-butane, isobutane and propane as proxy reactant molecules (T = 303-398 K, adsorbate partial pressure 0-1.2 bar). Analysis of the transient adsorption/desorption profiles of these molecules from either a bed of the zeolite or pelletized particles of the crystals (with mean size < 1 μm) demonstrate that diffusion in the secondary meso-/macroporous structure formed in the packing or the pellets controls the overall sorption rates. The experimental adsorption/desorption profiles from the pelletized zeolites were regressed with available mathematical models to obtain effective meso-/macropore diffusivities for reactant molecules, and nearly perfect fits of the experimental and the modeled profiles. Taking into account the dead volume in the system, a criterion for reliable measurements of either micropore or mesopore diffusivities by the TEOM technique is derived. © 2009 American Institute of Chemical Engineers AIChE J, 2010
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12063