The effect of thermal treatment and of grinding on silicalite-1 synthesized in the presence of fluoride ions

Influence of synthesis parameters on vanadium-silicalite-1 crystal growth prepared with fluoride-containing media

“…The crystallization rate also decreases with increase in vanadium content in the gel with a b exponent, for [Vanadium source] b , equal to À0.81 for À0.35 for VOSO 4 and V 2 O 5 , respectively.…”

“…When the low pH values were used, hydrolysis reaction shifted to the left and the amount of the Si(OH) 4 …”

“…From the formal kinetic equation, 1/ind tp[Vanadium source] a , an a of À0.37 and À0.47 can be estimated for VOSO 4 and V 2 O 5 , respectively.…”

“…Moreover, zeolite crystals obtained many fewer defect groups and are larger than microporous solids prepared by alkaline media [4]. In fact, the fluoro-complexes formed initially have an octahedral geometry so that their transformation into tetrahedrally coordinated species needs longer time with respect to a traditional medium.…”

Improved performance of PDMS/silicalite-1 pervaporation membranes via designing new silicalite-1 particles

“…Compared with silicalite-1(OH), zeolite obtained from fluoride media (referred to as silicalite-1(F)) showed larger size and less silanol groups [27]. Zhang et al [28] reported that silicalite-1 (F) showed better selectivity of ethanol than silicalite-1(OH).…”