Catalytic Cracking of Supercritical n-Dodecane over Wall-Coated HZSM-5 Zeolites with Micro- and Nanocrystal Sizes

详细信息    查看全文

• 作者：Guozhu Liu ; Ganglei Zhao ; Fanxu Meng ; Shudong Qu ; Li Wang ; Xiangwen Zhang
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：February 16, 2012
• 年：2012
• 卷：26
• 期：2
• 页码：1220-1229
• 全文大小：561K
• 年卷期：v.26,no.2(February 16, 2012)
• ISSN：1520-5029

文摘

Wall-coated HZSM-5 with micro- and nanoscale crystal sizes were prepared and coated to the inner surface of SS304 stainless-steel tubes using washcoating methods. It was found that nanoscale HZSM-5 zeolite slurry has different rheological properties, washcoat loadings, and adhesions with microscale HZSM-5. Catalytic activities of the prepared micro- and nanoscale HZSM-5 zeolite coatings were studied using catalytic cracking of supercritical-phase n-dodecane (550 掳C and 4 MPa), indicating that catalytic cracking activity and stability were remarkably improved more than 1 time by nanoscale HZSM-5 coatings compared to microscale HZSM-5 coatings. Acid and pore structure characterization showed that the better performance of nanoscale HZSM-5 coating may be attributed to the shorter diffusion length of the micropore, the higher diffusion rate of supercritical n-dodecane in the intracrystal mesopore, and the special acid nature of nanoscale HZSM-5 coatings.