# Mechanism Study of Combustion Dynamics of GO@CL-20 Composite
## 3 Results and Discussion
### Distribution of Cracking Products  
The high-temperature cracking behavior of CL-20@GO was investigated using a single-pulse shock tube at a pressure of 10.0 bar and a temperature range of 1500-2200 K. The cracking products of CL-20@GO were identified using a flame ionization detector (FID). The cracking products were subjected to qualitative and quantitative analysis using a flame ionization detector (FID), resulting in the identification of six distinct cracking products. The pyrolysis process yielded three principal products. The identified products were allene, ethene, and methane. The concentrations of these products were found to be correlated with the pyrolysis temperature. As illustrated in Figure 7, the concentration of these products exhibits a tendency to increase and subsequently decline as the pyrolysis temperature rises. When the temperature is raised to a certain point, these hydrocarbon molecules break down into smaller, lower molecular weight gaseous molecules, such as CO\({}_{2}\) and NO\({}_{2}\). Furthermore, three additional products were identified: propene, 2-butene, and 1,3-butadiene. The presence of the 2-butene molecule was contingent upon the addition of a GO  
Figure 6: Distribution of IDT with temperature for each sample. molecule. It is reasonable to posit that this molecule was produced by the decomposition of the GO. Figure 7 illustrates the abundance of hydrocarbon products, including allene, ethene, and methane, among the pyrolysis products. The content of pyrolysis products attains its maximum value at 1750 K. The pyrolysis products of CL-20@GO are the most sensitive to temperature. It can be concluded that at 1750 K, CL-20@GO is within the temperature range at which it is most susceptible to cracking. A considerable quantity of pyrolysis products can be obtained, as well as a certain amount of propylene, 1,3-butadiene, and other pyrolysis products that are difficult to observe at other temperatures. The concentrations of the pyrolysis products, including allene, ethylene, and methane, exhibit a comparable pattern of change to that of the pyrolysis temperature, with concentrations increasing gradually as the temperature rises. Subsequently, the concentration of the products declines as the pyrolysis temperature rises. The maximum concentration of methane is observed at approximately 1700 K, with a GC-4 sample decomposing at this temperature to produce approximately 32 ppm methane. The temperature at which the highest concentration of ethylene is observed is approximately 1650 K, with 100 mg of GC-3 yielding approximately 30 ppm of the compound. In contrast, the temperature at which the highest concentration of allene is observed is higher, at approximately 1850 K, with 100 mg of GC-4 yielding up to 12 ppm of the compound. Furthermore, the temperature dependence of the concentrations of propene, 2-butene, and 1,3-butadiene exhibits a comparable pattern, with peaks occurring to some extent. The high temperature cracking products follow a similar trend with temperature, reaching a certain peak in yield. In the distribution plot of 2-butene, sample GC-3 has a high cascade extra around 1700 K. The reason is presumed to be that the residual gas in the pipeline is not cleaned up. In terms of product content, methane, ethene, and allene are still the three main products with decreasing content in that order. Figure 7: Distribution of decomposition products as a function of temperature. Concurrently, the gas chromatography analysis revealed that the yields of a minor carbon-nitrogen molecule, C\({}_{2}\)N\({}_{2}\), were sufficiently elevated. Figure 8 illustrates the peak area of the resulting C\({}_{2}\)N\({}_{2}\) plotted against the four samples, which is directly proportional to the direct yield of the decomposition product. It can thus be concluded that the yield of C\({}_{2}\)N\({}_{2}\) increases gradually with the addition of GO. Furthermore, a considerable quantity of C\({}_{2}\)N\({}_{2}\) molecules constituted a significant component of the decomposition products of GO@CL-20.