SAPO-34 Zeolite Membrane for CO2/N2 Separation
Global warming is one of the main problems in the world. Carbon dioxide is one of greenhouse gases that contribute to global warming. The low temperature distillation with is a commercial method that is used for purification of CO2 from high content CO2 gas with high pressure. However, this metho...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/38329 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Global warming is one of the main problems in the world. Carbon dioxide is one of
greenhouse gases that contribute to global warming. The low temperature distillation with
is a commercial method that is used for purification of CO2 from high content CO2 gas
with high pressure. However, this method is not applicable for lower CO2 content gases
with atmospheric pressure such as flue gas. Membrane technology is potential to separate
CO2 from gases, since membrane process requires less energy. This study used a silica
supported SAPO-34 zeolite membrane that has a pore size of 0.38 nm to effectively
separate CO2 and N2 due to the molecular sieving and adsorption. This study aims to
synthesize SAPO-34 on silica as support with optimized secondary growth which use
combination of ageing, rubbing, and enhanced gel as synthesis method.
The feed used in this research is pure gas CO2 and N2. The feed gas pressure varied from
150 kPa to 1500 kPa with flow rate of 2 SCFH. SAPO-34 membrane layer was
successfully synthesized in the inside of tubular silica support with TEAOH as the
structure directing agent. XRD result of SAPO-34 seeds showed the characteristics of
SAPO-34 crystal with rhombohedral shape and high crystallinity. SEM analysis showed
that the size of SAPO-34 seeds was about 200-400 nm and membrane thickness was about
1.7 ?m. The CO2 permeance of synthesized SAPO-34 membrane was about 5.48 x 10-6
mol/m2.s.Pa and the CO2/N2 selectivity was about 53. The highest permeance and
selectivity was observed at 27°C and 98 kPa trans-membrane pressure. High selectivity
of SAPO-34 membrane was the result of molecular sieving and selective adsorption
separation mechanism. Silica support and optimized secondary growth create uniform
SAPO-34 layer due to stronger hydrogen bonding and controlled growth of SAPO-34
crystals on membrane.
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