Catalytic cracking of hydrocarbons over zeolite catalysts is widely used in refining industry to improve the yields of light oil, and is getting many attentions in some new fields, for example, active cooling technology for thermal management system of advanced aircraft.  In the situation, the hydrocarbon fuel plays dual role as a power sources and the coolant for advanced thermal management, in which catalytic cracking of hydrocarbon is used to improve the cooling capacity ascribed to the endothermic reactions, especially in presence of zeolite catalyst. However, the application of solid zeolite is challenging by the micro channel (ca. 1 mm) of heat-exchanger due to the possible limitations of flowing and heating resistance, as well as rapid deactivation of zeolite catalysts. Very recently, we proposed an quasi-homogeneous catalytic cracking of hydrocarbons using dispersible HZSM-5 nanocrystals i.e., dispersing nanocrystals of zeolites into hydrocarbon fuels, which offers a promising method due to continuous feeding and discharging of both hydrocarbon fuel and dispersible catalyst. In the work reported here, organofunctionalization of zeolitic seeds method is used to synthesize HDZ nanocrystals. The hexyl grafted TPA-ZSM-5 nanoparticles are obtained from hydrothermal synthesis using seeds grafted hexyl, and then regrafted by silylation was performed to supplement the surface alkyls after removal of the templates (calcined at 550 �C). The obtained HDZ nanoparticles not only exhibit improved dispersion stability due to the smaller crystal size and the grafting of hexyl, but also significantly catalytic cracking activity using n-dodecane as model fuel.

Synthesis of hydrocarbon dispersible HZSM-5 nanocrystals for catalytic cracking of n-deodecane

244th National Meeting (2012)

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