W-SSZ-13 molecular sieve membrane, preparation method thereof and application of W-SSZ-13 molecular sieve membrane in gas separation

• Main Authors: DUAN ZHAOFENG, PENG LI, GU XUEHONG, CEN SHUMIN
• Format: Patent
• Language: Chinese; English
• Published: 03.05.2024
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a W-SSZ-13 molecular sieve membrane as well as a preparation method and application thereof in gas separation, and the preparation scheme of the W-SSZ-13 molecular sieve membrane comprises the following steps: placing a carrier loaded with an SSZ-13 seed crystal layer in membrane synthesis gel, and heating for primary crystallization; adding a tungsten-containing compound, and heating for secondary crystallization; and then washing, drying and roasting to obtain the W-SSZ-13 molecular sieve membrane. The W element is doped into the framework of the SSZ-13 molecular sieve membrane, so that the pore size of the SSZ-13 molecular sieve membrane can be reduced, the separation selectivity of the membrane layer to CO2/N2 and CO2/CH4 is further improved, meanwhile, silicon hydroxyl on the surface of the membrane layer is eliminated by doping the W element, the hydrophobicity of the membrane is further improved, and the W-SSZ-13 molecular sieve membrane can be used for separating CO2/N2 and CO2