Synthesis and characterization of DNL-6, a new silicoaluminophosphate molecular sieve with the RHO framework

Synthesis of ordered mesoporous silicoaluminophosphates by using LTA zeolite precursors dissolved under acidic conditions

“…31 P MAS NMR spectrum gave a peak at ca. À 25 ppm corresponding to P(OAl) 4 [16]. These results indicated that the incorporation of tetrahedral phosphorus species in the framework inhibits the release of aluminum species from LTA nanoblocks.…”

Synthesis of DNL‐6 with a High Concentration of Si (4 Al) Environments and its Application in CO2 Separation

“…The amount of Si in M-DNL-6 [Si/(Si+Al+P) = 0.182 mol] is much larger than that of the DNL-6 synthesized by using hydrothermal methods in the presence of cetyltrimethylammonium bromide (CTAB, 0.135 molar ratio; designated as L-DNL-6). [29] Until now, a DNL-6 containing a higher Si content (0.205 molar ratio, designated as H-DNL-6) could only be achieved by using an aminothermal method, which was recently reported by our group. [30] By comparing the initial gel molar ratios to the final product compositions from each method, it was observed that the Si content of DNL-6 increased with increasing template concentration in the gel.…”

“…[27] DNL-6 is an isomorphous crystal of the RHO zeolite with a SAPO-based composition, which was recently reported by our group. DNL-6 possesses a large pore volume (0.36 cm 3 g À1 ) and good thermal stability up to 1373 K; [28][29][30] however, the Si content in DNL-6 is restricted to a narrow concentration range, and varying the Si content in the starting gel can lead to the emergence of SAPO-34. DNL-6 exhibits a suitable pore size (3.6 ) and is, therefore, a potential candidate for the selective adsorption of CO 2 ; this was verified in our preliminary work.…”

A novel solvothermal approach to synthesize SAPO molecular sieves using organic amines as the solvent and template

“…Our laboratory recently reported its first synthesis under hydrothermal conditions by using DEA as the template in the presence of cetyltrimethylammonium bromide (CTAB). 43,44 Along with increasing the synthetic temperature to 200 C, the product became a mixture of SAPO-34 and DNL-6 (sample 9). It should be mentioned that the solid yields of samples 8 and 9 were obviously lower than those synthesized with TEA solvent, but close to that obtained by the hydrothermal route with DEA template (sample 12).…”