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2021
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Analysis of the role of catalyst support
The solid catalyst used in heterogeneous catalytic reaction is usually composed of three parts: active component and cocatalyst, that is, catalyst carrier. The active component plays a decisive role in the activity of the catalyst. Cocatalyst can improve the active agent selectivity of the catalyst. The catalyst carrier mainly carries the active component and cocatalyst to improve the physical properties of the catalyst.
The solid catalyst used in heterogeneous catalytic reaction is usually composed of three parts: active component and cocatalyst, that is, catalyst carrier. The active component plays a decisive role in the activity of the catalyst. Cocatalyst can improve the active agent selectivity of the catalyst. The catalyst carrier mainly carries the active component and cocatalyst to improve the physical properties of the catalyst.
The catalyst support is used in the preparation of catalysts. The initial purpose is to save precious metal materials (such as platinum, palladium, etc.) and improve the mechanical strength of the catalyst. Later, due to the difference in catalyst activity caused by the use of different catalyst supports, the effects of other aspects of the support were studied.
It is understood that the catalyst support has the following functions:
(1) Increase the effective surface area and provide a suitable pore structure;
(2) Improve the mechanical strength of the catalyst, including wear resistance, hardness, compressive strength and impact resistance;
(3) The catalyst support can improve the thermal stability of the catalyst;
(4) Increase the active center of the catalytic reaction;
(5) New compounds formed by interaction with active ingredients;
(6) The catalyst carrier can also increase the anti-toxic performance of the catalyst and reduce the sensitivity to poisons;
(7) Save the amount of active ingredients and reduce costs.
The application of catalyst carrier in automobile exhaust purification is one of the important uses of catalysts. The main harmful components in automobile exhaust are CO, hydrocarbons (HC) and NOx. The purification of automobile exhaust is through oxidation and reduction reactions on the surface of the catalyst to turn them into harmless CO2, H2O and N2 and discharge them.
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