SAPO-11/HBeta composites for catalytic cracking of 2-butylene: effects of defect structure
- 111 Downloads
SAPO-11/HBeta composite was synthesized by using hydrothermal method (SB-H) and applied as catalyst for cracking of 2-butylene to C2–C3 olefins. SB-H sample exhibited comparatively high selectivity and high yield of C2–C3 olefins. XRD, IR, 27Al and 31P MAS NMR, Py-IR characterizations indicate that defect structure P(AlO4) n (n < 4) really existed in SB-H sample. SAPO-11 and HBeta chemically bonded and the defect P(AlO4) n (n < 4) formed during the hydrothermal synthesis of SB-H sample. P(AlO4) n (n < 4) unit caused new B acidic sites, which increased B acidic amount and B acidic distribution on SB-H sample. The improvement of B acidity decreased apparent active energy of cracking of 2-butylene to C2–C3 olefins on SB-H sample. Therefore, the high selectivity and high yield of C2–C3 olefins were obtained on SB-H sample in catalytic cracking of 2-butylene.
KeywordsSAPO-11 HBeta composite molecular sieve defect structure butylene catalytic cracking acidic property
Unable to display preview. Download preview PDF.
- Zhang, X., Wang, J., Zhong, J. 2004Petrochem. Tech.33781Google Scholar
- Zhao, G., Teng, J., Zhang, Y., Xie, Z., Yue, Y., Chen, Q., Tang, Y. 2005Appl. Catal. A299167Google Scholar
- Zhang, Z., Zong, B. 2003Chin. J. Catal.24856Google Scholar
- R. Xu and W. Pang, Chemistry of Molecular Sieve and Multiporous Materials (Fen Zi Shai yu Duo Kong Cai Liao Hua Xue) (Ke Xue Chua Ban She, Beijing, 2004), p. 171Google Scholar
- E.M. Flanigen, H. Khatami, and A.H. Seymenski, Adv. Chemistry Series, Vol. 101, eds. E.M. Flanigen and L.B. Sand (American Chemical Society, Washington, DC, 1971), p. 201Google Scholar
- Tanabe, K., Misono, M., Ono, Y., Hattori, H. 1989New Solid Acids and Bases their Catalytic PropertiesKodaushaTokyoGoogle Scholar