The separation of methane and nitrogen is critical for upgrading low‐grade natural gas. However, their similar physicochemical properties render efficient separation extremely challenging. This study explores the application of Engelhard titanosilicate‐4 for N 2 /CH 4 separation. Framework thermal contractibility is tailored by regulating crystallization time. Thermal activation enables precise pore‐size modulation, affording a superior separation selectivity of 15.1. Furthermore, the material properties are evaluated through structural characterization, adsorption isotherm measurements, and kinetic tests. Finally, in the simulation of a two‐bed six‐step vacuum pressure swing adsorption (VPSA) process, the obtained methane product has a purity exceeding 95%, validating the promising practical application potential of this adsorbent.
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Wang et al. (2026) studied this question.
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