Polyphosphate in chromium catalyst support

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing

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502210, 526105, 526106, 526129, 526134, 526156, 526352, C08F 402, C08F 424, C08F 462, B01J 2718

Patent

active

045474796

ABSTRACT:
A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate composition is heated in a dry atmosphere and thereafter impregnated with a zerovalent chromium component under anhydrous conditions. The resulting catalyst is active for olefin polymerization. In the second embodiment, alumina is impregnated with a polyphosphoric acid composition. This resulting polyphosphoric acid impregnated alumina can be used as a support for zerovalent chromium or can be impregnated with a chromium component and oxidized to give an active hexavalent chromium species. The resulting catalysts are advantageous because of their unusual sensitivity to hydrogen thus allowing great leeway in molecular weight control.

REFERENCES:
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patent: 4147758 (1979-04-01), Adrian et al.
patent: 4364841 (1982-12-01), McDaniel et al.
patent: 4364842 (1982-12-01), McDaniel et al.
patent: 4397765 (1983-08-01), McDaniel

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