Silicoaluminophosphate molecular sieves: another new class of microporous crystalline inorganic solids

Synthesis and perfection evaluation of NaA zeolite membrane

“…Compared the NaA zeolite membrane in this study with other small pore size zeolite membrane, e.g. the SAPO-34 zeolite membrane (poresize between 0.43 and 0.50 nm [31]), the latter showed a better H 2 /n-C 4 H 10 permselectivity [23,32], which indicated that methods to improve the perfection of the NaA zeolite membrane will still need to be investigated. …”

Synthesis of NaA zeolite membranes from clear solution

“…Gas permeation properties of the NaA zeolite membrane with the synthesis time of 2 h after a two-stage synthesis as a function of gas molecular kinetic diameters at 25°C under 0.10 MPa pressure di erence. nm [43]), the latter shows a high permselectivity of H 2 /n-C 4 H 10 [34,44]. In addition, because the pore size of NaA zeolite (0.41 nm) is smaller than the kinetic diameter of n-butane (0.43 nm), the permeation of n-C 4 H 10 indicates that the NaA zeolite membranes have certain defects that have a diameter larger than the pore size of NaA zeolite.…”

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

“…Silicoaluminophosphate (SAPO) molecular sieves were firstly invented by Lok et al in 1984 [1,2], as a new family of molecular sieves. The development of SAPO series provides a broad range of different frameworks and different compositions, some are analogous to available silica-dominant zeolites, such as SAPO-34 and SSZ-13.…”

“…For comparison, SAPO-34 was also prepared by hydrothermal method and VPT method using morpholine as SDA according to the procedures of Brent M. Lok and Hualan Zhou [2,20], the obtained samples were designated as S34-H-M and S34-V-M, respectively.…”