Hydrodesulfurization Performances of Pd Catalysts Supported on ZSM-5/MCM-41 Composite Zeolite
Received date: 2017-01-20
Online published: 2017-02-23
Supported by
Project supported by the China National Petroleum Corporation Fund (Nos. 2013E-1502, 2014B-2508).
Siliceous MCM-41 (Si-MCM-41), two micro-mesoporous materials obtained either by physically mixing Si-MCM-41 with HZSM-5 zeolite (Z-MCM-41-M) or by coating Si-MCM-41 over HZSM-5 zeolite particles (Z-MCM-41), were prepared and characterized by means of XRD, N2 adsorption-desorption, pyridine adsorbed FT-IR. The hydrodesulfurization (HDS) performances of the supported Pd catalysts thereof, were evaluated with dibenzothiophene (DBT) as the model sulfur-containing molecule. The close relationship between the surface area of the support and the HDS performance for the supported Pd catalysts was not observed. The result indicated that the surface area of the support or the dispersion of the catalyst might not be the key parameter affecting the HDS performance of the supported Pd catalyst. However, the HDS performances of Pd catalysts were significantly influenced by the pore structures and acid properties of the supports. Pd catalysts supported on the acidic supports showed the enhancement of HDS and hydrogenation activities that was thought to be the effect of hydrogen spillover. Among the catalysts studied, Pd/Z-MCM-41 exhibited the highest HDS activity and excellent hydrogenation activities. The results demonstrated that mesoporous materials introducing to microporous zeolite was beneficial to the improvement of HDS activities, but only physically mixing Si-MCM-41 with HZSM-5 zeolite couldn't show the combination advantage of pore of mesoporous materials and acid properties of microporous zeolite, and further generate better synergistic catalytic action. Z-MCM-41 composite material with the regular structure and uniform distribution acidity was potential carriers for precious metal catalysts.
Key words： MCM-41; ZSM-5; composite zeolite; Pd; hydrodesulfurization
Yang Xiaodong , Wang Xinmiao , Gao Shanbin , Wang Anjie . Hydrodesulfurization Performances of Pd Catalysts Supported on ZSM-5/MCM-41 Composite Zeolite[J]. Acta Chimica Sinica, 2017 , 75(5) : 479 -484 . DOI: 10.6023/A17010031
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