Double quantum-single quantum (DQ/SQ) 1H NMR spectroscopy has been used to localize the siloxy/silanol defects in two pure silica MFI zeolite samples synthesized by symmetric tetrapropylammonium hydroxide (TPAOH) and non-symmetric methyltributylammonium (MeTrBA) templates. Using DQ/SQ NMR, we provide important information on positions of structural framework that have tuned during hydrothermal ...

H-ZSM-5 nano-zeolites were synthesized by hydrothermal method using tetrapropylammonium hydroxide (TPAOH) as a template in the presence of various TPABr concentrations. The effect of different TPABr/TPAOH molar ratios was studied on the catalytic performance of dehydration of methanol to dimethyl ether (DME) in a fixed bed reactor under the same operating conditions (T=300°C, P=1 atm, and WHSV=...

Reported is the synthesis of Ge(9-x)Sn(x) heteroatomic deltahedral Zintl ions and their alkenylation by reactions with alkynes. The nine-atom clusters are made either by extraction from mixed Ge/Sn precursors with nominal composition K(4)Ge(9-x)Sn(x) or by dissolution of mixtures of the corresponding binary precursors K(4)Ge(9) and K(4)Sn(9) in solvents with high dielectric constants such as DM...