Effect of catalytic activity of magnesium oxide nanoparticles

The microhardness of magnesium oxide ceramics sintered at different temperatures and holding times was determined by the Vickers

microhardness method, and the bending strength of the ceramic sintered bodies obtained by sintering at different temperatures was tested by a three-point bending test. The factors affecting the magnitude of the ceramic hardness were discussed, and porosity and grain size were considered to be the main factors. The main factors affecting the strength of MgO ceramics were explored from the microstructure morphology of the ceramic material as the grain size, the high porosity and the size of dislocation density. The catalytic activity of the magnesium oxide nanopowders was evaluated in terms of the high temperature exothermic peak temperature, apparent heat of decomposition and low temperature weight loss rate of AP.

The study of Hebei Messi Biology Co., Ltd. showed that the nano-magnesium oxide powder exhibited good catalytic activity for AP, reduced the high-temperature exothermic peak temperature, increased the apparent heat of decomposition, and greatly increased the low-temperature decomposition weight loss rate of AP. The kinetic parameters of the decomposition process of AP catalyzed by magnesium oxide nanopowders were investigated by Kissinger method.

The mechanism of AP catalyzed by magnesium oxide nanopowders was investigated by electron transfer theory at Hebei Messi Biology Co. It was shown that: a large number of active centers such as surface hydroxyl groups, low coordination hydroxyl groups and H- ions existing on the surface of nanocrystals can become traps for trapping electrons and accelerate electron transfer; the small grain size of nanomaterials can increase the number of unsaturated coordination atoms on the surface of nanomaterials and form a large number of highly active edges, central defect sites and incomplete crystal surfaces, and these surface effect effects can greatly improve the catalytic performance.

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