STUDY ON THE PERFORMANCE OF MICRO-MESOPOROUS ZSM-5 SUPPORTED NiMo CATALYST FOR HYDRODEALKYLATION OF TRIMETHYLBENZENE
2021, 52(5):
67-75.
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A series of NiMo/ZSM-5 catalysts (designated as NiMoPZ, NiMoAKZ-1, NiMoAKZ-2, NiMoAKZ-3 respectively) were prepared by using ZSM-5 zeolite and micro-mesoporous HZSM-5 catalysts prepared under different alkali treatment time as the support. The catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption desorption, scanning electron microscopy and thermogravimetric analysis. The hydrodealkylation performance of 4 catalysts were evaluated under the condition of a H2 /1,3,5-trimethylbenzene (1,3,5-TMB) volume ratio of 300, a reaction temperature of 410-530℃, a reaction pressure of 1 MPa,a space velocity of 2.4 h-1, respectively. The results showed that the pore structure, acidity and morphology of the catalysts were changed and the hydrodealkylation performance of the catalysts were affected by the alkali treatment time. The NiMoAKZ-2 catalyst prepared by alkali treatment for 2 h had excellent hydrodealkylation performance with the 1,3,5-TMB conversion of 91.5%, the BTX yield of 65.3%, and the BTX selectivity of 71.3% at the reaction temperature of 530℃. The accessibility of acidic sites by 1,3,5-TMB was improved by the mesoporous channel of NiMoAKZ-2 catalyst, and the surface of the catalyst had less non-framework Si-Al species, and the permeability of the channel was good.
