| 摘要 |
1500089 Carbon monoxide shift process IMPERIAL CHEMICAL INDUSTRIES Ltd 22 Oct 1976 [4 Nov 1975] 45757/75 Heading C5E Carbon monoxide is reacted with steam to give carbon dioxide and hydrogen over a heterogeneous catalyst containing oxides and/or sulphides of one or more metals selected from zinc and the metals of Groups VIA and VIII of the Periodic Table at a pressure of at least 15 atmospheres absolute, the catalyst having an activity of from 0À05 to 0À2 reciprocal seconds (measured as defined in the Specification) and being present in a bed comprising an upstream zone having an outlet temperature from 350 to 400‹ C. and a downstream zone having an outlet temperature higher than that of the upstream zone, the catalysts in the zones differing in one or more of the following ways: (a) the upstream zone contains more, by weight, of catalytic material per unit volume than the downstream zone; (b) the upstream zone catalyst has a lower area to volume ratio than the downstream zone catalyst; and (c) the upstream zone catalyst has a lower porosity than the downstream zone catalyst. The catalyst used most preferably contains chromium oxide and an oxide of iron and/or zinc. In the upstream zone the catalyst particles are conveniently cylinders, but may also be in the form of spheres, whereas the particles in the downstream zone are usually cylinders which may be hollow, indented or protrusioned. The process may be used in conjunction with any of the usual sources of reactant gas and any of the usual uses of reacted gas. |
