Synthesis, Characterization And Modification Of SAPO-34 Zeolite Membrane For Separation Of CO2 From Binary Gas Mixtures
Loading...
Date
2012-05
Authors
Chew, Thiam Leng
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
In the present research, silicoaluminophosphate – thirty four (SAPO-34)
zeolite membranes were synthesized on -alumina disc support using (1) direct insitu
crystallization and (2) microwave (MW) heating. MW heating formed thinner
SAPO-34 membrane (thickness of ~ 1.6 m) with narrower zeolite crystal size
distribution (~ 0.6 m) in much shortened synthesis time of 2 hours at 200 oC
compared to direct in-situ crystallization. The SAPO-34 membranes synthesized
using MW heating were modified by ion-exchange process with Mg2+, Ca2+, Sr2+
and Ba2+cations. The membranes were characterized using TEM, XRD, SEM, TGA,
EDS, FT-IR and nitrogen adsorption-desorption. The Ba2+-modified SAPO-34
zeolite membrane increased the CO2/CH4, CO2/N2 and CO2/H2 separation selectivity
by 240, 217 and 127 % respectively in the equimolar gas mixture permeation and
separation. The Ba2+-modified SAPO-34 zeolite membrane was tested for single gas
permeation of CO2, CH4, N2, H2. The binary gas permeation and separation of
CO2/CH4, CO2/N2 and CO2/H2 was also studied. Response surface methodology
(RSM) were used to optimize the process parameters for binary gas permeation and
separation of CO2/CH4, CO2/N2 and CO2/H2. Mathematical models, developed based
on combined approaches of Maxwell-Stefan formulation and Langmuir isotherm,
were able to predict the single gas permeation, binary gas permeation and separation
(in terms of permeance and selectivity) through the Ba2+-modified SAPO-34
membrane within an error of 10 %.
Description
Keywords
Modification of SAPO-34 Zeolite membrane , separation of CO2 from binary gas mixtures