Efficient synthesis of thin SSZ-13 membranes by gel-less method

Zeolite-based catalytic membrane reactors for thermo-catalytic conversion of CO2

“…In addition to OSDA-free synthesis, a gel-free process is a promising alternative to the conventional method where the precursor gels have to be aged. Benefiting from the gel-free secondary growth, the membrane synthesis turns out to be safer, more environmentally friendly, less expensive, and simpler in operation ( Le et al., 2020 ; Tang et al., 2021a ; Nguyen et al., 2021 ). For instance, with kaolin as the substrate, the compositional elements were provided from the support, and the SAPO-34 and AIPO-18 zeolite membranes were formed in situ .…”

Facile synthesis of mesoporous ZSM-5 aided by sonication and its application for VOCs capture

“…It is extremely desirable to shorten synthesis time and lower synthesis temperature, which not only reduces synthesis cost (energy consumption, autoclave productivity etc), but also lowers environmental footprints and safety concerns. To reach this goal, it is of great importance to enhance nucleation and crystallization kinetics during zeolite synthesis, which could be realized by the following approaches [2] , including recipe (high concentration) [3] , [4] , [5] , [6] , high synthesis temperature [7] , [8] , reactive Si source [9] , [10] , [11] and Al source [12] , fast heating (including microwave heating [13] , [14] , [15] and oil-bath heating [16] , [17] , [18] ), seeding [3] , [5] , [18] , [19] , [20] , [21] etc. However, these methods usually associate with high equipment cost, the use of expensive and toxic chemicals, safety concerns, etc., which limit their large-scale applications.…”

Dual‐templating surface gel into thin SSZ‐13 zeolite membrane for fast selective hydrogen separation

“…[23] Three methods to reduce the thicknesses of zeolite membranes have been reported: (1) additive-regulated crystallization, [24] (2) seeded growth using two-dimensional zeolites, [25,26] and (3) gel-less synthesis. [27,28] The gel-based method is facile and more cost-effective than the former two: nontoxic or uncomplex reagents are needed for zeolite formation. The variation of gel properties can easily control the membrane crystallization.…”