The Preparation of Group II Oxide Catalysts Through Acetate Calcination: The Influence of a Support on the Nature of the Final Catalyst

Abstract

The preparation of supported and unsupported group II oxide catalysts through oxidation of analogous group II acetates (Mg, Ca and Ba) in the presence and absence of a mesoporous silica material (SBA-15) was analysed using TGA. In the absence of the mesoporous support the acetates oxidised at different temperatures with a stability trend whereby Mg<Ca<Ba. The Mg and Ca salts were totally converted into the analogous oxides following treatment to 750°C (albeit with different routes of conversion) while Ba(CH 3 CO 2 ) 2 was converted into BaCO 3 .Once dispersed onto SBA-15, all acetates combusted at similar temperatures irrespective of the counter-ion (indicating its nature was less important). The counterion also inverted the nature of the final material with, in this case, BaO and substantial amounts of CaO forming but MgCO 3 being the product of Mg(CH 3 CO 2 ) 2 combustion.

The use of alkaline earth oxides as pH modifiers for selective glycerol oxidation over supported Au catalysts

“…Solid bases such as group II oxides and carbonates have received recent attention as basic catalysts and supports [28,29] but, to our knowledge; have never been used as pH modifying agents in these selective oxidation reactions. In this work we have compared the activity and selectivity of a standard Au/TiO 2 catalyst in the selective oxidation reaction when NaOH(aq), CaO(s) and BaO(s) are used as basic agents within the reaction under ambient pressure.…”