Heterogeneous Tin Catalysts Applied to the Esterification and Transesterification Reactions

Table 7

Textural properties of the SnO₂ and SO₄²⁻/SnO₂ catalysts [31].

Entry	Catalyst-sulfate (% wt.); Temperature (K)	Specific surface area [m^2/g]	Pore volume; [cm^3/g]	Pore diameter; [Å]	[TGA] mmol SO3/g catalyst
1	SnO2; 0; 773	62	0.051	70
2	SO4^2−/SnO2; 0.45; 773	99	0.054	25	0.201
3	SO4^2−/SnO2; 0.45; 873	88	0.052	28	0.137
4	SO4^2−/SnO2; 0.30; 773	87	0.050	28	0.194
5	SO4^2−/SnO2; 0.15; 773	85	0.060	28	0.129
6	SO4^2−/SnO2; 0.45; 673	92	0.060	26	0.194