SAPO-34 Zeolite Membrane for CO2/N2 Separation

• Main Author: Steven Kencana, Kevin
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/38327
• Institution: Institut Teknologi Bandung

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.