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Supported metal oxide double active center polyethylene catalyst, process for preparing the same and use thereof
The present invention relates to a supported hybrid vanadium-chromium-based catalyst, characterized in the catalyst is supported on a porous inorganic carrier and a V active site and a inorganic Cr active site are present on the porous inorganic carrier at the same time. The present invention further relates to a process for producing a supported hybrid vanadium-chromium-based catalyst. The invention also provides the preparation method of the catalyst, titanium or fluorine compounds, vanadium salt and chromium salt according to the proportion, different methods of sequence and load on the inorganic carrier, after high temperature roasting, still can further add organic metal catalyst promoter prereduction activation treatment on it. The catalyst of the present invention can be used for producing ethylene homopolymers and ethylene/α-olefin copolymers. The hybrid vanadium-chromium-based catalyst can have high activity and produce polyethylene polymers having the properties of broad molecular weight distribution (Part of the products are bimodal distribution) and excellent α-olefin copolymerization characteristic.
EAST CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
C C Y C C
C08F C08F Y02P C08F C08F
inventional inventional additional inventional inventional
Qiaoqiao Weiwei Ruihua Boping Zhen Yun Xin Xuan Xuelian Lisong
Sun Liu Cheng Liu Liu He Xue Dong He Wang