Since 1983, I have been engaged in the research and development of VOCs combustion catalysts, covering the basic and applied research of catalysts. I have published over 100 papers and over 30 invention patents. In the field of combustion catalyst development, it has experienced natural mordenite-supported precious metal (Pt, Pd) catalysts for over 30 years; alumina supported precious metal catalysts (Pt, Pd); cordierite honeycomb supported precious metal catalysts (Pt, Pd, Rh) Non-precious metal catalyst. Today, we will focus on the issues that are of general interest in the use of VOCs catalytic purification (burning) precious metal catalysts. First, the precious metal content and catalyst performance In the precious metal catalyst, the precious metal is the main factor that constitutes the cost of the catalyst, the level of the precious metal content directly determines the cost of the catalyst. That is, the direct consequence of noble metal content is an expensive catalyst. In addition to environmental protection precious metal catalysts in the petrochemical, pharmaceutical, synthetic fine chemicals and other fields are also widely used. How to reduce the precious metal content has been the direction of the academic and industrial efforts since the catalyst was present. The precious metal content is one of the main factors that affect the performance of the catalyst, but it is not the only one. The catalyst performance, in addition to the precious metal content, is also related to the preparation of the catalyst, the use of a cocatalyst, the combination of a plurality of noble metals (Pt-Pd, Pt-Pd-Rh, Pt-Pd-Ru, etc.) Only through continuous exploration and research, can high-performance catalyst formulations and preparation processes be achieved, achieving the goal of reducing precious metal content, increasing catalyst activity, anti-poisoning and long service life. Due to the complexity of the factors that affect the performance of the catalyst, such as the distribution of active components (precious metals), valence states of noble metals, electron transfer between active components and cocatalysts, and particle size of noble metals, High-performance catalysts require long-term efforts. As a simple example, if the precious metals remain the same, catalysts with different noble metal distributions can be obtained by different preparation methods. For example, spherical catalyst eggshell type (precious metal catalyst surface); protein type (precious metals in the middle); egg yolk type (precious metals in the innermost); and precious metals evenly distributed catalyst. Although these four forms of catalysts have the same noble metal content, the performance of the catalysts varies greatly. In addition, the thickness of the shell of eggshell catalyst also affects the catalyst activity and stability. This example shows that the precious metal content is not the only determinant. In the choice of catalyst should be considered. Second, the composition of complex VOCs on the catalyst requirements A wide range of VOCs can be broadly divided into: hydrocarbons (mainly alkanes and alkenes), aromatic hydrocarbons (benzene, toluene, xylene, etc.), esters (ethyl acetate, diethyl phthalate, , Methyl ethyl ketone, etc.), alcohols, acids, nitrogen-containing organic compounds, chlorine-containing organic compounds, sulfur-containing organic compounds. VOCs emitted by enterprises are related to the nature of production of enterprises, and the composition of VOCs emitted varies greatly. Even in the same industry, the types of VOCs emitted by the can manufacturing industry are different. For example, Pd catalyst for toluene catalytic effect is good, but the effect of benzene is relatively poor; non-precious metal catalyst for ethyl acetate is better. Due to the complexity of VOCs, the same catalyst has different effects on the treatment of different organic waste gases. Therefore, scientific analysis is needed to select the most suitable catalyst to deal with complex systems. Third, the catalyst life issues In general, VOCs catalyst life of about 2 years, the service life depends on the catalyst performance and use of the environment, and its use of normative, but also with the catalyst preparation process, precious metal content, precious metal species, cocatalyst related. Therefore, for complex VOCs, a reasonable choice of catalyst, and its treatment process, is the only way to play a catalyst performance and improve service life. The following is a catalyst manual. Organic Waste Gas Purification Catalyst User Manual Determination of catalyst usage Considering that the composition of industrial organic waste is complicated and often contains high-boiling organic compounds (or polymers), in order to satisfy the deep purification of VOCs (deep deodorization) and ensure the long-term use of the catalyst, the catalyst is recommended to use a space velocity of 10000-20000h-1 If the airspeed 10000h-1,10000m3 / h air volume should be filled with 1 cubic meter of catalyst; such as airspeed 20000h-1,10000m3 / h air volume should be filled 0.5 cubic meters of catalyst). If the catalyst loading is too small, it will affect the effectiveness of organic waste gas treatment. Catalyst usage precautions 1. Catalyst bed catalyst packed tightly, so as to avoid gas short circuit, resulting in the purification efficiency. 2. The gas and temperature distribution of the organic waste gas entering the catalyst bed should be uniform. The concentration of organic waste gas entering the catalyst bed should be within the safe limits of the explosion limits. 3. The oxygen content of the organic waste gas entering the catalyst should be greater than 5%. 4. Environmental protection equipment before each boot, the catalyst bed should be preheated to 300-350oC, before entering the organic waste gas. In order to ensure the long-term use of the catalyst, the precious metal catalyst is usually used at a temperature of 320-450 ° C. and a short time of no more than 850 ° C. The rare earth non-precious metal catalyst is usually used at a temperature of 3350-400 ° C. and a short time of no more than 550 ° C. 5. Environmental protection equipment normal work, the catalytic temperature should be higher than the temperature before the catalyst, the temperature difference is proportional to the concentration of organic matter. 6. Should avoid access to containing resin, high boiling point polymers, heavy metals, and sulfur, fluorine-containing organic matter and other substances likely to cause catalyst poisoning. 7. Catalysts for butane and other low boiling point alkanes, naphtha solvent, methylene chloride less effective, so in the choice of catalytic combustion should be aware of the composition of the exhaust gas, or paint in advance to our test. 8. When using environmental protection equipment, it should do a good job of recording the various parameters.