Abstract
The reaction between methanol and hydrogen sulfide leading to the formation of methanethiol and dimethyl sulfide has been studied using different H 2 S:CH 3 OH molar ratios (0.5:1, 1:1, 2:1) at 623 K on various metal oxides presenting different acidity and basicity. The correlations between activity and selectivity of catalysts and their average oxygen and cation charges as well as the strength of their acidic and basic sites, determined by adsorption of probe molecules followed by IR spectroscopy, are as follows: (i) the highest strength of basic sites and the highest negative charge on oxygen (MgO) lead to the lowest activity and the highest selectivity toward CH 3 SH; (ii) the lowest strength of basic sites (medium oxygen charge) and the highest cation charge (γ-Al 2 O 3 ) cause the highest activity and the highest selectivity toward (CH 3 ) 2 S
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