To investigate the effect of unsaturated aliphatic hydrocarbons on PAHs （polycyclic aromatic hydrocarbons） formation, numerical analysis using detailed reaction mechanism is performed. For the carbon black produced ...To investigate the effect of unsaturated aliphatic hydrocarbons on PAHs （polycyclic aromatic hydrocarbons） formation, numerical analysis using detailed reaction mechanism is performed. For the carbon black produced by benzene feedstock, three kinds of unsaturated aliphatic hydrocarbons （acetylene, diacetylene, and vinylacetylene） are added. The detailed reaction mechanism which is proposed by Wang and Frenklach is consisted by 527 reactions and 99 chemical species. The formations of PAHs and nuclei are promoted by unsaturated aliphatic hydrocarbons addition. There exits optimal benzene/acetylene ratio （XA/XB = 0.50）, benzene/diacetylene mixture ratio （XD/XB = 0.60）, benzene/vinyl-acetylene mixture ratio （XV/XB = 0.25）. The formation of nuclei is most promoted by acetylene addition, and the benzene/acetylene mixture ratio is 0.50.展开更多
To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heat...To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heating rate on the aggregate shape and mean primary particle diameter of the carbon black are investigated using TEM （transmission electron microscopy）. The mean primary particle diameter does not change significantly when carbon black is heat treated. For short heating times and low heating temperatures, the aggregate shapes become simple when compared with those of non-heated carbon black, and shapes become complex with an increase in the heating time. Also, for low heating rates, the aggregate shapes become significantly simple when compared with those of non-heated carbon black. The results of this study suggest that sintering between primary particles is promoted under relatively low heating temperatures, and Ostwald ripening among aggregates is promoted under relatively high heating temperatures.展开更多
文摘To investigate the effect of unsaturated aliphatic hydrocarbons on PAHs （polycyclic aromatic hydrocarbons） formation, numerical analysis using detailed reaction mechanism is performed. For the carbon black produced by benzene feedstock, three kinds of unsaturated aliphatic hydrocarbons （acetylene, diacetylene, and vinylacetylene） are added. The detailed reaction mechanism which is proposed by Wang and Frenklach is consisted by 527 reactions and 99 chemical species. The formations of PAHs and nuclei are promoted by unsaturated aliphatic hydrocarbons addition. There exits optimal benzene/acetylene ratio （XA/XB = 0.50）, benzene/diacetylene mixture ratio （XD/XB = 0.60）, benzene/vinyl-acetylene mixture ratio （XV/XB = 0.25）. The formation of nuclei is most promoted by acetylene addition, and the benzene/acetylene mixture ratio is 0.50.
文摘To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heating rate on the aggregate shape and mean primary particle diameter of the carbon black are investigated using TEM （transmission electron microscopy）. The mean primary particle diameter does not change significantly when carbon black is heat treated. For short heating times and low heating temperatures, the aggregate shapes become simple when compared with those of non-heated carbon black, and shapes become complex with an increase in the heating time. Also, for low heating rates, the aggregate shapes become significantly simple when compared with those of non-heated carbon black. The results of this study suggest that sintering between primary particles is promoted under relatively low heating temperatures, and Ostwald ripening among aggregates is promoted under relatively high heating temperatures.
