Xinhuanet, Berlin, April 27 (Reporter Zhou Gufeng) The Technical University of Berlin in Germany published a communique on the 27th, saying that researchers from the school and American scientists have jointly developed a new type of platinum alloy, which can be used as a catalyst for hydrogen fuel cells. Costs are reduced by 80%.

The bulletin said that hydrogen fuel cells only generate water while generating electricity, which is very environmentally friendly, but because the chemical process of generating electricity must use a large amount of precious metals as catalysts, the cost of hydrogen fuel cells has always been high.

Platinum is one of the most common noble metals used as catalysts. The researchers first mixed platinum with copper, and then separated some of the copper from the platinum-copper alloy, resulting in spherical platinum-copper alloys only a few nanometers in diameter. The characteristic of this spherical platinum-copper alloy is that the interior is relatively cheap copper, and the platinum atoms are mainly distributed on the surface of the alloy, which greatly reduces the amount of platinum used. At the same time, because the arrangement density of platinum atoms on the alloy surface is much denser than that of ordinary platinum, the catalytic effect of this new type of catalyst is better. The researchers estimate that hydrogen fuel cells using this catalyst could cut costs by 80 percent.

Researchers will further study the combination effect of platinum and other non-precious metals in order to find out the performance of this purification device. The purification of organic waste gas and the elimination of odor is suitable for organic waste gas with low concentration (50-10000PPm) that should not be treated by direct combustion or catalytic combustion method and adsorption recovery method, especially for the treatment of large air volume. economic and social effects.

Process principle overview:

The purification device is designed according to two basic principles of adsorption (high efficiency) and catalytic combustion (energy saving). That is, adsorption concentration-catalytic combustion method. The equipment works continuously with two gas paths, two adsorption beds can be used alternately, one catalytic combustion chamber, first adsorb the organic waste gas with activated carbon, stop the adsorption operation when it is almost saturated, and then use the hot air flow to desorb the organic matter from the activated carbon down to regenerate the activated carbon; the desorbed organic matter has been concentrated (the concentration is dozens of times higher than the original) and sent to the catalytic combustion chamber for catalytic combustion, and catalytic oxidation is carried out on the catalyst at 300-350 ° C to convert it into harmless When the concentration of organic waste gas reaches more than 2000PPm, the organic waste gas can be maintained naturally in the catalytic bed without external heating. Part of the exhaust gas after combustion is discharged into the atmosphere, and most of it is sent to the adsorption bed for the removal of activated carbon. Attached regeneration. In this way, the heat energy required for combustion and desorption can be met, and the purpose of energy saving can be achieved. The regenerated activated carbon can be used for the next adsorption; when one adsorption bed is desorbed, the control system can automatically open the other adsorption bed to continue the adsorption of organic waste gas In this way, the switching operation of the two adsorption beds can realize continuous work with a large workload.

Process features:

The equipment is unique in material, stable in performance, easy to operate, safe and reliable, energy-saving and labor-saving, and has no secondary pollution.

A new type of activated carbon adsorption material - honeycomb activated carbon, has superior kinetic properties compared with granular activated carbon. It is very suitable for use under high air volume. The catalytic combustion chamber adopts precious metal catalyst of ceramic honeycomb body, which has low resistance and high activity. The activated carbon bed for adsorbing organic waste gas can be desorbed and regenerated with the exhaust gas after catalytic combustion. The desorption regeneration is carried out. The desorbed gas is sent to the catalytic combustion chamber for purification, no additional energy is required, the operating cost is low, and the energy saving effect is remarkable.

The selection of activated carbon determines the purification efficiency of exhaust gas treatment equipment, so on the basis of ensuring qualified emissions, the filling amount of activated carbon should be reasonably configured and the appropriate activated carbon should be selected. better catalyst.