Recent developments in zeolite membranes for gas separation

Two-dimensional (2D) materials of nanosized thickness are emerging building blocks for designing membranes with superior performance (i.e. high gas permeation flux and selectivity), as a result of their unique nanostructures. In this review, we discuss the recent breakthroughs in the synthesis of 2D nanosheets and the preparation of 2D nanosheet-based gas separation membranes, focusing on the synthetic methods for preparing 2D nanosheets (covering inorganics, hybrids, carbons and organics), the structural properties of 2D nanosheets, the fabrication methods of 2D nanosheet-based membranes, and their performance in gas separation. The current technical limitations and future research directions in this field are also discussed.

Two-dimensional nanosheet-based gas separation membranes

Scale-up of MFI zeolite membranes for desalination by vacuum membrane distillation

Using the Maxwell-Stefan formulation for highlighting the influence of interspecies (1−2) friction on binary mixture permeation across microporous and polymeric membranes

Separation of mixtures using microporous crystalline materials is normally achieved by exploiting differences in the adsorption strengths of the constituent species. The focus of the current investigation is on diffusion-selective separations that exploit differences in intra-crystalline diffusivities of guest molecules. A number of experimental investigations report overshoots in intra-crystalline loadings of the more mobile species during transient mixture uptake. Analogous overshoots in fluxes occur for mixture permeation across thin microporous membrane layers. The attainment of supra-equilibrium loadings is a common characteristic of diffusion-selective separations; this allows the over-riding of adsorption selectivities. The primary objective of the current investigation is to demonstrate that the Maxwell–Stefan diffusion formulation, using chemical potential gradients as driving forces, is capable of providing a quantitative description of the temporal and spatial overshoots found in diverse experimental studies. The origins of the overshoots can be traced to thermodynamic coupling effects that emanate from sizable off-diagonal contributions of the matrix of thermodynamic correction factors. If thermodynamic coupling effects are neglected, the overshoots are not realized. It is also demonstrated that while the transport of the more mobile partner is uphill of its loading gradient, its transport is downhill the gradient of its chemical potential. The deliberate exploitation of uphill diffusion to achieve difficult separations is highlighted.

Tracing the origins of transient overshoots for binary mixture diffusion in microporous crystalline materials

MFI membranes for separation of carbon dioxide from synthesis gas at high pressures

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MFI membranes for separation of carbon dioxide from synthesis gas at high pressures