Combustion gas catalyst, catalytic burner as well as preparation methods and application thereof

Abstract

The invention relates to a combustion gas catalyst, a preparation method and application thereof, a catalytic burner and a preparation method thereof. The combustion gas catalyst comprises a carrier, a catalytic active component and a modifier, wherein the carrier is mainly prepared from Al2O3, and the catalytic active component consists of either or both of Pt and Pd. The combustion gas catalyst disclosed by the invention has the characteristics that the catalytic activity is high, the performance is stable, no naked fire exists during burning, the burning is sufficient, toxic waste gases are hardly produced, and the like, and the service life is long under the normal working temperature of 1,100 DEG C. The catalytic burner disclosed by the invention has very high infrared radiation efficiency, polluting gases of burnt gas are few, the cost is low, the burner is less prone to backfiring, and the use safety performance of combustion gas is high, so that the catalytic burner can be applied to the manufacture of gas stoves, gas water heaters, gas heaters, gas boilers or industrial gas drying equipment and the like.

Description

technical field [0001] The invention relates to the technical field of catalytic combustion, in particular to a gas catalyst and a preparation method thereof, and also to a catalytic burner and a preparation method and application thereof. . Background technique [0002] Domestic consumption of liquefied petroleum gas and natural gas is increasing year by year, and these gases mainly release energy through traditional flame combustion. The heat energy of flame combustion is mainly convective heat energy, and radiation energy only accounts for a very small part. Convective heat transfer is carried out through the temperature difference and residence time between the convective heat (hot air, flame) and the heated object. Due to its short residence time, a large amount of its convective heat is consumed, so that the heat received by the appliance is large. In order to reduce, the thermal efficiency is low; at the same time, the flame combustion temperature is high (1500 degr...

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Problems solved by technology

The Chinese patent application with publication number CN1224047A discloses a catalyst for natural gas combustion, which is mainly composed of subgroup metals, alkaline earth metals and rare earth metals, which can convert HC, CO and NO x Reduced to less than 1ppm, but its use temperature is low and its life is short, so it cannot be practically applied

The Chinese patent application with the publication number CN133203A discloses a gas combustion catalyst, which is mainly composed of alkaline earth metals, noble metals and alumina, and has good low-temperature activity, but it is only suitable for methane concentrations of 0.4-4%, and it is a granular catalyst. Can not be used to process gas appliances

The Chinese patent application with the publication number of 1504260 discloses an integral gas catalytic combustion catalyst applicable to gas cookers. The invention patent uses three catalysts with different components to coat the honeycomb substrate. The preparation process is relatively complicated. The catalyst is mainly The components are transition metals and rare earth metals, and the service life is relatively limited, and the entire honeycomb contains catalyst components. When used on a gas cooker, tempering is easy to occur, posing a safety hazard