| 摘要 |
A process for producing a chromium-based catalyst for the production of polyethylene, the process comprising providing a silica support having a surface area of at least 380m<2>/g and a pore volume of at least 1.5ml/g; impregnating the silica support with a liquid including a source of aluminium ions and a source of phosphate ions; neutralising the resultant impregnated support with a neutralising agent to provide a pH greater than 7 for the resultant neutralised support whereby aluminium phosphate forms in pores of the silica support; and, at any stage in the method, impregnating the silica support with a chromium component.
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