🎓 PhD in Chemical Engineering ITB — Redefining Global Limits in CO₂ Separation
For over 30 years, gas separation membrane technology has been limited by a single global benchmark: Robeson upper bound, which describes the inherent trade-off between permeability and selectivity. High flux means poor separation, and vice versa.

A breakthrough from ITB changed this paradigm. Research by Widda Rahmah and colleagues demonstrates that small-pore zeolite membranes can surpass this classical limit. Thanks to their rigid crystalline framework and well-defined sub-nanometer pores, these membranes separate gases via molecular sieving and selective adsorption, not the solution–diffusion mechanism typical of polymer membranes.

When global data are viewed collectively, their performance defines a new benchmark — the Rahmah Upper Bound — reshaping how permeability–selectivity trade-offs are understood and opening new pathways for CO₂ capture, decarbonization, and net-zero technologies.

Congratulations to Widda Rahmah and the entire promoter and supervisory team at Institut Teknologi Bandung for this outstanding, globally recognized scientific contribution.

Why pursue a PhD in Chemical Engineering at ITB? At ITB, doctoral research means:

• Challenging and redefining global scientific benchmarks.

• Integrating materials science, catalysis, thermodynamics, and process engineering.

• Contributing directly to climate and sustainability solutions.

Ready to create the next breakthrough? Join the PhD in Chemical Engineering ITB and be part of research that matters — globally impactful.

📚 Key Publication
Rahmah, W., Kadja, G. T. M., Mahyuddin, M. H., Saputro, A. G., Dipojono, H. K., & Wenten, I. G. (2022). Small-pore zeolite and zeotype membranes for CO₂ capture and sequestration – A review. Journal of Environmental Chemical Engineering, 10(6), 108707. https://lnkd.in/g4X2n_BH. (Q1)

Other publication by Widda during her doctoral study:

• Rahmah, W., Khoiruddin, K., Ariono, D., Kadja, G. T. M., & Wenten, I. G. (2025). Journal of Porous Materials, 1–12. https://lnkd.in/gJBNKEga (Q2)

• Rahmah, W., Khoiruddin, K., Wenten, I. G., & Kawi, S. (2024). Carbon Capture Science & Technology, 13, 100318. https://lnkd.in/gda-JqNV (Q1)

• Rahmah, W., Novita, T. H., Wenten, I. G., & Kadja, G. T. M. (2023). Materials Today Sustainability, 22, 100345. https://lnkd.in/gDihUDwF (Q1)

• Wenten, I. G., Khoiruddin, K., Mukti, R. R., Rahmah, W., Wang, Z., & Kawi, S. (2021). Reaction Chemistry & Engineering, 6(3), 401–417. https://lnkd.in/gqE-6ZfT (Q1)