Uniform polymerization sites with high activity can be created by treating a Phillips-type CrII/SiO2 catalyst with CH2Cl2 (as shown schematically in the picture) under well-defined conditions. A mechanism is proposed in which CH2Cl2 increases the catalytic activity of a small fraction of Cr sites while poisoning the remainder.
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Nenu et al. (2007) studied this question.
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