Effect of MgF2 and Al2O3 supports on the structure and catalytic activity of copper–manganese oxide catalysts

Abstract

Structure and catalytic activity of double copper-manganese oxide catalysts supported on MgF 2 and Al 2 O 3 have been studied. All samples were calcined at 400°C and those supported on Al 2 O 3 also at 550 and 950°C. The properties of surface species have been characterized by low temperature adsorption of nitrogen, XRD and TPR-H 2 . The catalytic activities have been tested in lowtemperature CO oxidation and in NO reduction by propene. The supported oxides react with each other during calcination to form CuMn 2 O 4 spinel. The spinel seems to be responsible for the catalytic activity of the double copper-manganese catalysts. The temperature of calcination changes the strength of interaction between the active phase and the supports influencing the catalytic activity.

Properties of Magnesium Oxo-Fluoride Supports for Metal Catalysts

“…It has been tested successfully as a support of oxide and metallic phases [1], making active and selective catalysts of oxidation [2,3], reduction [4,5] and hydrogenolysis [6,7]. However, its drawback in potential applications as a support is a low stability of texture above 400°C--the surface area decreases from *45 at 400 to *23 m 2 g -1 at 500°C and 4.3 at 700°C [1].…”