FCC Light Cycle Oil (LCO) is considered a potential feedstock for the production of light aromatic hydrocarbons such as benzene, toluene and xylene (BTX) because it contains high levels of polycyclic aromatic hydrocarbons (PAHs). The selective hydrocracking of polycyclic aromatic hydrocarbons into BTX as an alternative to LCO has attracted widespread attention. Zeolite-based bifunctional catalysts have been realized as effective hydrocracking catalysts. Here, we developed a Ni-W/Beta catalyst system with different metal/acid ratios to screen for the synchronization of metal and acid functions in a bifunctional catalyst. 1-methylnaphthalene(1-MN) was selected as the catalyst for hydrocracking of Ni-W and β-zeolite. Firstly, the γ-Al2O3 and H-β molecular sieves with different Si/Al ratios were ground and mixed as carriers, which were expressed as AB(x), where x was the molar ratio of Si/Al to β molecular sieves, and the Ni-W metal species were introduced by impregnation. The amount of acid decreased as the β zeolite Si/Al ratio increased from 25 to 150. The reaction performance of NiW/AB(x) at different 1-MN conversion ratios was studied.The NiW/AB(60) catalyst was screened for the highest selectivity of BTX, and the product distribution of the reaction conversion was shown in Figure 1. Therefore, the reaction path of 1-MN hydrocracking is further proposed. 1-MN hydrogenates at the metal site to generate monocyclic aromatic hydrocarbons, monocyclic aromatic hydrocarbons are isomerized at the Brønsted acid site and cyclically opened to generate alkylbenzene, which is dealkylated and side-chain reaction to form BTX.

1-Methylnaphthalene hydrocracking on a nickel-W/Al2O3-β catalyst is prepared to BTX

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