Imidazolium-based ionic liquids as novel organic SDA to synthesize high-silica Y zeolite

Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO2/Al2O3 Molar Ratio

“…When the ZnO/SiO 2 molar ratios increasef rom 0.02 to 0.06 in the initial gels, the product SiO 2 / Al 2 O 3 molar ratios increase from ca. [37] And only one peak at approximate 62 ppm is found in 27 Al MAS NMR spectra( Figure S4b), corresponding to tetrahedrally-coordinated aluminumi nt he FAUf ramework. 6( Table 1).…”

“…Notably,n oz inc was detected in the Na + exchanged samples ( Figure S3 and Table 1), implying that zinc was not embedded into the zeolite framework, but acting as extraframework charge-compensating species.F or the sample with the highest SiO 2 /Al 2 O 3 molar ratio (Zn-5) detected by ICP-OES andE DX, the frameworkS iO 2 /Al 2 O 3 molar ratio was also determined by solid-state MAS NMR.T he 29 Si and 27 Al MAS NMR spectra of Zn-5 are shown in Figure S4.T he 29 Si MAS NMR in Figure S4a 3 and/or Si(OSi) 1 (OAl) 3 ]. [37] And only one peak at approximate 62 ppm is found in 27 Al MAS NMR spectra( Figure S4b), corresponding to tetrahedrally-coordinated aluminumi nt he FAUf ramework. The SiO 2 /Al 2 O 3 molar ratio of Zn-5 determined from the deconvolutiono ft he 29 Si MAS NMR spectra is 5.80 ( Figure S5), close to that measured by ICP-OES and EDX.…”

Investigations of the formation of zeolite ZSM-39 (MTN)

“…19 Examples of synthesis of silicate-or aluminosilicate-based molecular sieves in the ILs containing imidazolium ion or the DESs containing tatraalkylammonium SDA are relatively rare. [20][21][22][23][24][25][26][27] The reason for this is due to the low solubility of silica in IL and / or DESs. Although there have been reports on the crystallization of zeolites under hydrothermal conditions, no extensive mechanistic studies have been performed on the formation of zeolites in a solvent system containing DES.…”

Syntheses of high-silica zeolites in urea/choline chloride deep eutectic solvent

“…2 Indeed, ionothermal synthesis has been successfully used to synthesize several types of microporous materials such as AlPO 4 -, GaPO 4 -and SAPO-based molecular sieves as well as metal-organic frameworks with existing or novel topologies. [3][4][5][6][7][8][9][10] However, there have been relatively few reports on the preparation of siliceous zeolites mainly due to the poor solubility of silica in the ILs and DESs. 5,[8][9][10][11][12][13][14][15] So far, to the best of our knowledge, there are only six reports on ionothermal syntheses of zeolites.…”

“…5,[8][9][10][11][12][13][14][15] So far, to the best of our knowledge, there are only six reports on ionothermal syntheses of zeolites. 5,[9][10][11][13][14][15][16] In most cases 5,[8][9][10][11][12][13][14][15] , a small amount of water was always added to the reaction mixture for ionothermal synthesis as the presence of water is essential for the D r a f t 3 reactions to take place. Water plays crucial roles in the dissolution of reactant species and the condensation steps of the framework formation.…”