# Analysis of the Odor Purification Mechanism and Smoke Release of Warm-Mixed Rubber Asphalt
## 3 Results and Discussion
### Analysis of Asphalt Smoke Composition
#### 3.5.5 Analysis of Smoke Types  
From Figure 9, it can be seen that the mean and standard deviation of nitrogen oxide emissions are the highest in various asphalt experiments and are greatly affected by the  
Figure 8: Hydrogen sulfide analysis. coupling effect of the deodorizing agent and the warm-mixing agent, as well as other chemical reactions. The emissions fluctuate greatly, indicating that the components and chemical reactions of the deodorizing agent and the warm-mixing agent can effectively consume nitrogen oxides or prevent their production. Secondly, ammonia gas is coupled with a purifying agent and a warm-mixing agent, which can effectively reduce emissions. The emissions of sulfur dioxide and hydrogen sulfide have relatively small fluctuations, among which hydrogen sulfide is least affected by the coupling effect of the deodorizing agent and the warm-mixing agent. This may be due to the fact that deodorizing agents usually contain sulfides such as hydrogen sulfide, which produce sulfur-containing gases during chemical reactions, thereby affecting the degradation of hydrogen sulfide and sulfur dioxide. The comparison of harmful gas data shows that there is a difference in the degradation effect between powder-type and liquid-type deodorizers. Powder-type deodorizers are usually made of porous adsorption materials. The principle of odor purification is mainly based on adsorption, whereby the huge surface area and porous structure of powder-type deodorizers adsorb odor molecules from the air onto the surface of the deodorizer, thereby making the air fresher. Specifically, when air passes through a powder-type deodorizer, the porous structure of the deodorizer can adsorb odor molecules in the air, including organic and inorganic gas molecules such as sulfides, nitrides, and oxides. After these gas molecules are adsorbed, their concentration decreases, thereby achieving the goal of eliminating or reducing odors. In addition, the adsorbent material in powdered deodorizers can also decompose some odor molecules through physical or chemical means, further purifying the air. The decomposition process mainly depends on the active substances contained in the deodorant, which may include active oxides, metal oxides, etc. They have the ability to undergo redox reactions and can decompose some odor molecules into harmless substances. However, the deodorizing effect of powder-based deodorizers is influenced by factors such as environmental humidity and temperature. In high-humidity environments, the adsorption capacity of deodorants may decrease. In higher-temperature environments, the activity of odor molecules increases, which may reduce the adsorption effect of the deodorant. Therefore, when using powdered deodorizers, it is necessary to choose and use them reasonably based on environmental conditions. Liquid-type deodorizers are usually made from organic compounds of plant alcohols. The principle of purifying odors is mainly to eliminate odor molecules through chemical reactions. Plant-alcohol organic compounds have strong chemical activity and can react with odor molecules to change their chemical structure, thereby eliminating or reducing  
Figure 9: Summary of smoke components. odors. For example, certain plant-alcohol organic compounds can react with sulfides to convert them into odorless substances. They can also react with oxides to decompose them into harmless substances. Liquid deodorizers also have certain limitations. Firstly, the stability of plant-alcohol organic compounds is relatively low, and they are easily affected by factors such as light, oxygen, and ultraviolet radiation, leading to oxidation and deterioration. The purification and degradation principles of powder and liquid deodorizers each have their own characteristics. The powder type mainly purifies air through physical adsorption and chemical decomposition, while the liquid type mainly eliminates odor molecules through chemical reactions.