Low temperature CO oxidation non-noble metal catalyst

Abstract

The invention provides an oxidation catalyst to purify CO in room temperature, which is prepared in coprecipitation method or deposition-precipitation method. The catalyst consists of non precious metal active components and carrier, wherein the loading of the active components is 5 to 80 percent of the conversion value of metal element. The active components come from cobalt salt liquid, iron salt liquid, nickel salt liquid, manganese salt liquid, copper salt liquid, zinc salt liquid, tin salt liquid and cerium salt liquid. The carrier comes from alumina, silica, molecular sieve, honeycomb ceramics, wire fence, cobalt oxide, iron oxide, manganese oxide, copper oxide, zinc oxide, tin oxide and cerium oxide. The precipitant is Na2CO3, K2CO3, sodium hydroxide, urea or ammonia. The catalyst preparation solution needs to be fully stirred for 1 to 8 hours and the retrogradation duration is 1 to 16 hours. The dried solution needs to be treated in in-situ remediation in air, oxygen, and hydrogen or nitrogen atmosphere in temperature from 100 to 500 degrees centigrade. The catalyst disuses precious metal as active component, so the cost is low and the preparation process is simple.

Description

Technical field [0001] The present invention is a CO oxidation non-precious metal catalyst that can purify the environment at low or normal temperature, and is mainly used for coal mine self-rescuers, gas masks, high-rise building escape masks or devices for CO protection. 2 Laser, CO sensor and CO purification in a closed environment. Background technique [0002] The CO purification catalyst used for a long time in the past is Hopcalite. It was jointly invented by Johns Hopkins University and the University of California in 1919. It is a catalyst made of active manganese dioxide and copper oxide in a certain proportion. Usually Hopcalite catalyst is prepared by sulfuric acid method. The first step is to produce active manganese dioxide, which is to mix manganese sulfate fine powder (below 70 mesh) with a small amount of water, and add concentrated sulfuric acid under constant stirring to make manganese sulfate (suspension in 70% sulfuric acid). At a temperature of 60°C, add gra...

AI Technical Summary

Problems solved by technology

The disadvantage is that the pretreatment is more complicated, and at room temperature, it cannot play an effective role

However, if gold is supported on a single carrier Al 2 o 3 In general, supported gold catalysts with low-temperature activity are generally not available. If gold is supported on a single transition metal oxide, the prepared catalyst generally has considerable difficulties in the process of realizing industrialization