Abstract
This Minireview focuses on the developments of the adsorptive separation of methane/nitrogen, ethene/ethane, propene/propane mixtures as well as on the separation of C8 aromatics (i.e. xylene isomers) with a wide variety of materials, including carbonaceous materials, zeolites, metal–organic frameworks, and porous organic frameworks. Some recent important developments for these adsorptive separations are also highlighted. The advantages and disadvantages of each material category are discussed and guidelines for the design of improved materials are proposed. Furthermore, challenges and future developments of each material type and separation processes are discussed.
Highlights
This Minireview focuses on the developments of the adsorptive separation of methane/nitrogen, ethene/ethane, propene/propane mixtures as well as on the separation of C8 aromatics with a wide variety of materials, including carbonaceous materials, zeolites, metal–organic frameworks, and porous organic ical properties of CH4 and N2 makes CH4/N2 separation one of the most challenging and key separations for natural gas utilization
In this Minireview, we mainly focus on the separation material for the synthesis of terephthalic acid, is the most and purification of hydrocarbons from methane and olefins to C8 aromatics
Research on porous materials for hydrocarbon separation and purification has experienced an explosive growth (Scheme 1). In this Minireview, we summarize the latest trends and related developments of hydrocarbon purification and separation ranging from methane/ nitrogen, ethene/ethane, propene/propane separation to the separation of C8 aromatics with porous adsorbents
Summary
CH4/N2 separation is intrinsically difficult because of the close kinetic diameters and comparable polarizability of CH4 and N2 (Table 1). For adsorption separation, according to the separation mechanisms, adsorbents can be divided into two categories: 1) CH4-selective adsorbents, which exhibit stronger adsorption interactions and higher adsorption capacity for CH4 than N2; the separation is typically based on the equilibrium mechanism; 2) N2-selective adsorbents, which preferentially adsorb N2 over CH4; the separation is dominantly based on the kinetic effect or steric effect. We will discuss these two groups of materials separately
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