Chromium substituted ETS-4 zeolite for enhanced N2/CH4 separation

Activiteit: Talk or presentation at a conference

Description

Ba-ETS-4 is a promising zeolite for nitrogen removal from low-grade natural gas via a kinetic separation as a result of the very slow diffusion of CH4 in this material. Its pore size is adjustable and can be tailored through dehydration temperature by structural water removal ​[1]​. In addition to that, we explore another method for pore engineering: the incorporation of Chromium into the crystal framework. Characterization of Chromium-substituted ETS-4 (Ba-CrETS-4) through XRD, SEM, and EDX analyses was followed by pure gas (N2 and CH4) isotherm measurements and dynamic breakthrough tests. Notably, dynamic breakthrough tests revealed enhanced kinetic effects induced by Chromium, leading to efficient CH4 rejection. CH4 uptake in the bed decreased to <20% (based on CH4 fed to the bed) for Ba-CrETS-4, contrasting with >90% for Ba-ETS-4. Consequently, CH4 productivity increased from 1.09 mmol g-1 h-1 for Ba-ETS-4 to 8.53 mmol g-1 h-1 for Ba-CrETS-4.
In conclusion, our study demonstrates the effectiveness of Chromium incorporation into the ETS-4 framework for enhancing nitrogen removal and methane rejection in low-grade natural gas. The observed increase in N2/CH4 selectivity and CH4 productivity highlights the potential of Ba-CrETS-4 as a promising adsorbent for gas separation applications. These findings contribute valuable insights into the field of porous materials engineering and offer practical solutions for optimizing gas purification processes.

References
​​1. Kuznicki, S. M. et al. A titanosilicate molecular sieve with adjustable pores for size-selective adsorption of molecules. Nature 412, 720–724 (2001).
Periode2 jul 20245 jul 2024
EvenementstitelBritish Zeolite Association Annual Meeting 2024
EvenementstypeConference
Conferentienummer277931
LocatieAmbleside, United Kingdom
Mate van erkenningInternational