5McDaniel M P. The activation of Phillips Cr/silica catalysts:V. Stability of Cr(VI)[J]. Applied Catalysis A:General,2008,335(2):252-261.
6Deshpande R,Hua D W,Smith D M,et al. Pore structure evolution in silica gel during aging/drying.Ⅲ. Effects of surface tension[J]. Journal of Non-Crystalline Solids,1992,144:32.
8Land V D,Harris T M,Henshaw J M. Effect of gel modulus on the porosity of low-density silica[J]. Journal of Non-Crystalline Solids,2003,316(2-3):238-245.
9McDaniel M P,Rohlfing D C,et al. Long chain branching in polyethylene from the Phillips chromium catalyst[J]. Polymer Reaction Engineering,2003,11(2):101-132.
10McDaniel M P. Influence of porosity on PE molecular weight from the Phillips Cr/silica catalyst[J]. Journal of Catalysis,2009,261(1):34-49.