Characterization of Modified Nanoscale ZSM-5 Catalyst and Its Application in FCC Gasoline Upgrading Process

• Published in: Energy & fuels Vol. 20; no. 4; pp. 1388 - 1391
• Main Authors: Zhao, Xiaobo, Guo, Xinwen, Wang, Xiangsheng
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 19.07.2006
• Subjects: Applied sciences; Crude oil, natural gas and petroleum products; Energy; Exact sciences and technology; Fuels; Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units; Scanning electron microscopy; Motor gasoline; Octane number; Hydrogen; Fixed bed reactor; Fluid catalytic cracking; Zeolite; Molecular sieve; Characterization; Ammonia; Upgrading; Performance; Catalyst activity; Catalyst
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef060004a

Nanoscale HZSM-5 zeolite was hydrothermally treated with ammonia water at 673 K and then loaded with La2O3 and ZnO. The parent and modified nanoscale HZSM-5 zeolite catalysts were characterized by SEM, XRD, NH3-TPD, IR, and XRF. In the presence of hydrogen, the performance of the modified ZSM-5 catalyst for FCC gasoline upgrading was evaluated in a fixed-bed reactor. The results indicated that the modified catalyst exhibited excellent aromatization activity, isomerization activity, and a strong ability to reduce olefin and sulfur contents in FCC gasoline. Under the given reaction conditions, the average olefin content in FCC gasoline was decreased from 49.6 to 12.8 vol % within 300 h time on stream; the aromatic and paraffin contents in the product were increased from 11.4 and 39.0 vol % to 24.7 and 62.5 vol %, respectively. The modified nanoscale ZSM-5 catalyst reduced sulfur concentration in FCC gasoline by about 78% without gasoline octane number loss.