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. 2022 Aug 15;13(35):10455–10460. doi: 10.1039/d2sc03628b

Germanosilicate zeolite syntheses using a series of imidazolium-based OSDAs at a fixed Si/Ge ratio (4.0) but different HF/OSDA ratiosa.

HF/OSDA graphic file with name d2sc03628b-u1.jpg graphic file with name d2sc03628b-u2.jpg graphic file with name d2sc03628b-u3.jpg graphic file with name d2sc03628b-u4.jpg graphic file with name d2sc03628b-u5.jpg graphic file with name d2sc03628b-u6.jpg graphic file with name d2sc03628b-u7.jpg
Productb
1.0 MFI + STW TON + MFI ITW ITW STW PST-35 + DON PST-35 + *STO
2.0 MFI + STW TON + MFI ITW ITW + (PST-35) STW PST-35 PST-35 + *STO
3.0 STW TON ITW ITW + A STW PST-35 + (STW) PST-35 + *STO
4.0 D D D + ITW D D D D
a

The composition of the synthesis mixture is 0.5ROH·0.8SiO2·0.2GeO2·xHF·5.0H2O, R is OSDA prepared here and x is varied in the range 0.5 ≤ x ≤ 2.0. All syntheses were performed under rotation (60 rpm) at 160 °C for 7 days. OSDA abbreviation: 1E3MI, 1-ethyl-3-methylimidazolium; 13DEI, 1,3-diethylimidazolium; 1E23DMI, 1-ethyl-2,3-dimethylimidazolium; 2E134TMI, 2-ethyl-1,3,4-trimethylimidazolium; 13DE2MI, 1,3-diethyl-2-methylimidazolium; 123TEI, 1,2,3-triethylimidazolium; 123TE4MI, 1,2,3-triethyl-4-methylimidazolium.

b

The product appearing first is the major phase, and the product obtained in a trace amount is given in parentheses. A and D indicate amorphous and dense phases, respectively.