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Hydrolysis of sucrose over composite catalysts
Pito, D; Fonseca, I; Ramos, A; Vital, J; Castanheiro, JThe hydrolysis of sucrose into glucose and fructose was carried out over composite catalysts at 80 ◦C. These catalysts consisted of USY and Beta zeolites dispersed in polymeric matrices (PDMS and PVA). The swelling degree of polymers increased with the amount of zeolite immobilised in PDMS and PVA. This result can be explained by the increase in the polymeric matrix channelling. Additionally, the effective diff...
Hydrolysis of sucrose using sulfonated poly(vinyl alcohol) as catalyst
Pito, D; Fonseca, I; Ramos, A; Vital, J; Castanheiro, JThe hydrolysis of sucrose was carried out over poly(vinyl alcohol) (PVA) with sulfonic acid groups, at 80 º C. The products of sucrose hydrolysis were glucose and fructose. A series of PVA with different crosslinking degree were prepared. It was observed that the catalytic activity of PVA matrix increases with the crosslinking degree, due to the increases of the amount of sulfonic acid groups on PVA. Further, t...
Methoxylation of -pinene over poly(vinyl alcohol) containing sulfonic acid groups
Pito, D; Fonseca, I; Ramos, A; Vital, J; Castanheiro, JoséThe methoxylation of a -pinene was studied using poly(vinyl alcohol) (PVA) containing sulfonic acid groups as catalysts. These groupswere introduced by the direct reaction between –OH groups of PVA and sulfosuccinic acid (SSA). Poly(vinyl alcohol) catalysts were prepared using sulfosuccinic acid by varying the amount of SSA (5–40 mol%). It was observed that the amount of acid sites increases with amount of SSA....
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