The role of boric acid in the synthesis of Eni Carbon Silicates.
The influence of H3BO3 on the crystallization of hybrid organic-inorganic aluminosilicates denoted as Eni Carbon Silicates (ECS's) was investigated. Syntheses were carried out at 100 °C under different experimental conditions, using bridged silsesquioxanes of general formula (EtO)3Si-R-Si(OEt)3 (R = -C6H4- (BTEB), -C10H6- (BTEN) and -C6H4-C6H4- (BTEBP)), in the presence of equimolar concentrations of NaAlO2 and H3BO3. The study, involving the synthesis of three different but structurally related phases (ECS-14 from BTEB, ECS-13 here described for the first time from BTEN, and ECS-5 from BTEBP), confirmed a catalytic role for H3BO3 which in general increased the crystallization rate and improved the product quality in terms of amount of crystallized phase (crystallinity), size of the crystallites and phase purity, while it was weakly incorporated in trace amounts in the framework of ECS's.
Eni S.p.A. - Refining & Marketing Division - San Donato Milanese Research Center, Via F. Maritano 26, I-20097 San Donato Milanese, Italy. roberto.millini@eni.com.
Stefano
S
Zanardi
Giuseppe
G
Bellussi
Wallace O'Neil
WO
Parker
Erica
E
Montanari
Michela
M
Bellettato
Giuseppe
G
Cruciani
Angela
A
Carati
Stefania
S
Guidetti
Caterina
C
Rizzo
Roberto
R
Millini