Design and Evaluation of Gas Transport through a Zeolite Membrane on an Alumina Support

Abstract

This chapter details the synthesis and applications of zeolite membranes (gas separation and zeolite membrane reactors). Gas separation is still not carried out at industrial level for zeolite membranes. Related areas, such as the possibility of incorporating a zeolite membrane in a reactor for possible catalytic action of the zeolite particles and scale-up issues are also discussed. The basic concept of mass transport through the zeolite layer has been presented. Zeolites can enhance the selectivity of methane more which can lead to the reduction of greenhouse gases in the atmosphere.

Post‐polymerization modification of polyetherimide by Friedel‐Crafts acylation: Physical–chemical characterization and performance as gas separation membrane

“…On the other side, an interesting observation can be made regarding the very low CO 2 /N 2 selectivity presented by membranes PB15 and PO15 (0.02 and 0.13, respectively). Both membranes presented a much higher permeability to N 2 than to CO 2 , resulting in an “inverse selectivity.” The inverse selectivity observed here can be attributed to the higher solubility of N 2 in PEI , as reported by Hu et al 38 and also to the degree of modification of PEI (around 15%), which may have affected the packing of polymer segments during the membrane formation 27,29,38–43 . Despite the unexpected result, the high inverse selectivity 39,41 at low pressure makes these materials interesting for designing membranes for the separation of nitrogen from carbon dioxide, for example 39–43 …”

“…The inverse selectivity observed here can be attributed to the higher solubility of N 2 in PEI, as reported by Hu et al 38 and also to the degree of modification of PEI (around 15%), which may have affected the packing of polymer segments during the membrane formation. 27,29,[38][39][40][41][42][43] Despite the unexpected result, the high inverse selectivity 39,41 at low pressure makes these materials interesting for designing membranes for the separation of nitrogen from carbon dioxide, for example. [39][40][41][42][43] To verify and prove the inverse selectivity of the membrane PB15, it was submitted to a methane permeability test.…”

Upgrading Biogas to a Biomethane by Use of Nano-Structured Ceramic Membranes

“…The mechanism of gas transport in membranes are derived from Graham's law and Fick's law (Shehu, Okon, Orakwe, & Gobina, 2018). Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.…”

Theoretical Study of CO2/N2 Gas Mixture Separation through a High-Silica PWN-type Zeolite Membrane

“…12−17 Compared to natural zeolites, synthetic ones are widely used in membrane-based separation technology because of their regular particle size and high purity. 18 PWN (PST-29) is a new type of zeolite family, which consists of five building units including lta, d8r, pau, t-plg, and t-oto. Its cubic scaffold is organized by embedding a pair of d8r and pau cages between two lta cages along the unit cell edges.…”

“…Zeolites, natural or synthetic, are wonderful materials because of their structural nanopores. Actually, the size of zeolite pores is at the molecular level, which makes them a suitable candidate for gas separation applications. − Thanks to their wonderful chemical and mechanical features, zeolites have shown an effective performance for gas separation, and now they are an interesting topic of many theoretical and experimental studies. − Compared to natural zeolites, synthetic ones are widely used in membrane-based separation technology because of their regular particle size and high purity . PWN (PST-29) is a new type of zeolite family, which consists of five building units including lta , d 8 r , pau , t - plg , and t - oto .…”