## 3 Results
### Pyrosis Analysis of CPHs
These results are consistent with those reported by [PERSON] et al. (2020) [51], who investigated the conversion of CPHs into biochar at temperatures between 400 \({}^{\circ}\)C and 800 \({}^{\circ}\)C. At 800 \({}^{\circ}\)C, they found a gas yield of approximately 35%, supporting the trend of increased gas production with higher pyrolysis temperatures. Regarding the proximate analysis, the typical effect of temperature is observed, namely, a reduction in volatile matter and an increase in ash content and fixed carbon, which results in a slight increase in the higher heating value (HHV). This effect has also been reported in previous works cited above. Figure 4 illustrates the time evolution of the concentrations of the main gases produced during the pyrolysis process at different temperatures. As the temperature increases from 600 \({}^{\circ}\)C to 700 \({}^{\circ}\)C, H\({}_{2}\) production rises significantly, primarily due to the cracking of volatiles, indicating enhanced decomposition of organic compounds at higher temperatures. In contrast, CO exhibits an early peak during the reaction, driven by decarboxylation and depolymerization reactions, but its concentration declines as the pyrolysis process progresses. Meanwhile, CH\({}_{4}\) shows more stable behavior, maintaining a prolonged peak at 700 \({}^{\circ}\)C, suggesting that higher temperatures promote the cracking and depolymerization of tars generated during pyrolysis. Lastly, CO\({}_{2}\) also presents an early peak due to decarboxylation reactions, but after approximately 15 min, its concentration decreases significantly, similar to CO.  
Figure 4: Effect of temperature on the evolution of H\({}_{2}\), CO, CH\({}_{4}\), and CO\({}_{2}\) over time in the pyrolysis analysis of CPHs. The CPHs exhibit a somewhat different behavior in the generation of H\({}_{2}\) and CH\({}_{4}\) compared to other biomass materials studied in previous works, such as olives and grape bagasse ([PERSON] et al., 1996) [48], cardoons ([PERSON] et al., 2000) [49], cherry stones ([PERSON] et al., 2003) [18], and almond shells [50], as well as walnut shells, almond tree pruning, and olive stones [52]. In the case of CPHs, the generation of these two gases continues for up to 25 min, with more stable values as the temperature increases. The difference compared to the aforementioned residues is that the peak generation of these gases occurs in the first 10-15 min of the reaction, after which their concentration drops significantly, so that by 25-30 min, they have nearly disappeared. Figure 5 shows the evolution of the accumulated moles of the gases generated over time at each temperature:  
For H\({}_{2}\), the accumulated moles increase linearly over time, with a steeper slope at higher temperatures. In the case of CO, the accumulated moles reach a constant value after an initial increase, as its concentration decreases in the first few minutes of the reaction. CH\({}_{4}\) follows a linear trend, with the highest values observed at 700 \({}^{\circ}\)C. Similarly, for CO\({}_{2}\), the accumulated moles increase at first but stabilize later, particularly at 700 \({}^{\circ}\)C.  
Table 6 summarizes the effect of temperature on the molar fractions of the generated gases, the PCS, and the thermal power produced. As the temperature increases, the molar fractions of H\({}_{2}\) and CH\({}_{4}\) rise, while those of CO\({}_{2}\) and CO decrease. Both PCS and thermal power also increase with temperature, primarily due to the higher production of energetic gases like H\({}_{2}\) and CH\({}_{4}\) at elevated temperatures.