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

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

Shandong Applied Research Center of Gold Nanotechnology(Au-SDARC), School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, Shandong, China

Received Date: 17 May 2016
Revised Date: 28 June 2016

Fund Project: This work was supported by the Shandong Taishan Scholarship, the Yantai double-hundreds talents plan, and the Shandong Natural Science Foundation (ZR2015BM006).

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%.
- Fluid catalytic cracking,
- ZSM-5,
- Gold modification,
- Propylene selectivity,
- Micro-activity test
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