1. W. Kunyuan, W. Xiangsheng, L. Gang, L. Huayun. catalysis(in chinese). 28(2007), p.617.
2. Hibino T, Niwa M, Murakami Y. Zeolites. Catal, Vol. 128(1993), p.518.
3. J. Ping, M. Li, P. Jian, C. Yuan, X. et al. Chinese Journal of catalysis. 30(2009), p.503.
4. J. Zhu, W. T. Wu,Y. Chang, et al. Petroleum Science and Technology, 28 (2010), p.7.
5. Hongxia W, Dali T, Yide X. et al. Chinese Jour nal of Catalysis, 25(2004), p.445.