Catalytic cracking of light diesel over Au/ZSM-5 catalyst for increasing propylene production

doi:10.1016/S1872-2067(16)62499-3

Abstract

Abstract:

The catalytic cracking of light diesel oil (235-337℃) over gold-modified ZSM-5 was investigated in a small confined fluidized bed at 460℃ and ambient pressure. Different Au/ZSM-5 catalysts were prepared by a modified deposition-precipitation method by changing the preparation procedure and the amount of gold loading and were characterized by X-ray diffraction, N₂ adsorption-desorption, temperature-programmed desorption of NH₃, transmission electron microscopy and inductively coupled plasma spectrometer. It was found that a small amount of gold had a positive effect on the catalytic cracking of light diesel oil and increased propylene production at a relatively low temperature. The maintenance of the ZSM-5 MFI structure, pore size distribution and the density of weak and strong acid sites of the Au/ZSM-5 catalysts depended on the preparation parameters and the Au loading. Simultaneous enhancement of the micro-activity and propylene production relies on a synergy between the pore size distribution and the relative intensity of the weak and strong acid sites. A significant improvement in the micro-activity index with an increase of 4.5 units and in the propylene selectivity with an increase of 23.2 units was obtained over the Au/ZSM-5 catalyst with an actual Au loading of 0.17 wt%.

Key words: Fluid catalytic cracking, ZSM-5, Gold modification, Propylene selectivity, Micro-activity test

Caixia Qi, Yunxia Wang, Xiaotao Ding, Huijuan Su. Catalytic cracking of light diesel over Au/ZSM-5 catalyst for increasing propylene production[J]. Chinese Journal of Catalysis, 2016, 37(10): 1747-1755.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62499-3

https://www.cjcatal.com/EN/Y2016/V37/I10/1747

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