Metal Oxides as Acid-Base Catalytic Materials

Influence of acid–base properties of Mg-based catalysts on transesterification: role of magnesium silicate hydrate formation

“…From the results shown in Figure 1b, over silica are mostly acidic, ionic oxygen ions in magnesium oxide are basic. [56] The repartition of the silica tetrahedrons and the magnesium and their coverage with hydroxyl groups, carbonates or water will determine the exact acid-base nature of the surface. For instance, the variation of the acid base properties for the sol-gel magnesium silicate was reported by Kriesel and Tilley.…”

First acidic macro-mesocellular aluminosilicate monolithic foams “SiAl(HIPE)” and their catalytic properties

“…The latter routes are totally inefficient for the true incorporation of aluminum cationic species in the silica network. 19 While Al in tetrahedral coordination is required to get strongly acid heterogeneous catalysts, 20 classical routes usually generate aluminum oxide chunks in octahedral environment. In the present study the emulsion-based sol-gel route is modified in an alkaline version to meet the ambitious agenda of obtaining, in one step, structured monolithic acidic catalyst bearing hierarchical porosity.…”

Potential Role of Nanomaterial’s In Oil and Gas Industry: Review on Downstream Stream Processing

“…Among the most widely used support materials for catalyst fabrication, alumina and silica are commonly used due to low cost and outstanding physical properties as catalysts sponsors [12]. In the industrial scale, alumina is widely used as a resource for several iron ore and sulphide catalysts.…”

“…For endothermic processes such as vapor conversion or partial oxidation, platinum or rhodiumbased nano catalysts are used. Silica-based catalysts are also widely used due to the robustness of machinery and their heat [12,13].…”

“…Fischer Tropsch to olefins (FTO) provides a direct route for transforming syngas to light olefins, without intermediate steps using catalysts. Among the various catalyst, bulk iron FT catalysts alone or modified with promoters offers the greater selectivity ( upto 70wt% ) for lower olefins (8,9,12). The advantages of Fe catalyst zed process are i) direct conversion of syngas to olefins ii) decreases the formation of methane iii) does not require the maintenance of H2-CO ratio .…”