Procedure for imparting selectivity to hydrogenation catalysts and method for using the same
AssigneeThe Standard Oil Company
InventorsJoAnn Henry, Michael J. Desmond, Thomas R. Gaffney
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Abstract
This invention relates to a method for the preparation of selective acetylene hydrogenation catalysts. More specifically, this invention relates to a pretreatment method for supported and unsupported Group VIII metal catalysts and the use thereof for the conversion of an acetylene-, ethylene- and hydrogen-containing feedstream to gasoline range hydrocarbons.
Claims45
A pretreatment method for imparting increased selectivity to Pd-Pb/CaCO.sub.3 acetylene hydrogenation catalysts comprising at least one cycle comprising the steps of:
- (a) oxidizing said catalyst;
- (b) reducing said catalyst in the presence of carbon monoxide;
- (c) reducing said catalyst in the presence of hydrogen;
- and
- (d) thermolyzing said reduced catalyst,
- wherein said catalyst is purged under a flow of inert gas between each step.
A method for the selective conversion of an acetylene-, ethylene-, and hydrogen-containing feedstream to gasoline range hydrocarbons comprising the steps of:
- (a) converting the acetylene in said feedstream to ethylene by passing said feedstream first over a pretreated Pd-Pb/CaCO.sub.3 hydrogenation catalyst;
- and
- (b) passing the ethylene-containing product gas of step (a) above over a catalyst system suitable for the conversion of ethylene to gasoline range hydrocarbons,
- the pretreatment of said Pd-Pb/CaCO.sub.3 catalyst consisting of:
- (a) oxidizing said catalyst;
- (b) reducing said catalyst in the presence of carbon monoxide;
- (c) reducing said catalyst in the presence of hydrogen;
- and
- (d) thermolyzing said reduced catalyst,
- wherein said catalyst is purged under a flow of inert gas between each step.
A pretreatment method for imparting increased selectivity to Pd-Pb/CaCO.sub.3 acetylene hydrogenation catalysts comprising at least one cycle comprising the steps of:
- (a) oxidizing said catalyst;
- (b) reducing said catalyst in the presence of carbon monoxide and hydrogen;
- and
- (c) thermolyzing said reduced catalyst,
- wherein said catalyst is purged under a flow of inert gas between each step.
A single pass, continuous process for the selective conversion of an acetylene-, ethylene-, and hydrogen-containing feedstream to gasoline range hydrocarbons comprising charging said feedstream to a reactor containing a Pd-Pb/CaCO.sub.3 acetylene hydrogenation catalyst and a catalyst system suitable for the conversion of ethylene to gasoline range hydrocarbons in sequence, such that said feedstream passes over said Pd-Pb/CaCO.sub.3 catalyst in order to convert said feedstream to ethylene, and then said ethylene thus produced passes immediately over said catalyst system suitable for the conversion of ethylene to gasoline range hydrocarbons, said Pd-Pb/CaCO.sub.3 catalyst having been first pretreated by a process consisting of:
- (a) oxidizing said catalyst;
- (b) reducing said catalyst in the presence of carbon monoxide;
- (c) reducing said catalyst in the presence of hydrogen;
- and
- (d) thermolyzing said reduced catalyst,
- wherein said catalyst is purged under a flow of inert gas between each step.
A single pass, continuous process for the selective conversion of an acetylene-, ethylene-, and hydrogen-containing feedstream to gasoline range hydrocarbons comprising charging said feedstream to a reactor containing a catalyst consisting essentially of a pretreated Pd-Pb/CaCO.sub.3 acetylene hydrogenation catalyst combined with a catalyst system suitable for the conversion of ethylene to gasoline range hydrocarbons, the pretreatment of said Pd-Pb/CaCO.sub.3 catalyst consisting of:
- (a) oxidizing said catalyst;
- (b) reducing said catalyst in the presence of carbon monoxide;
- (c) reducing said catalyst in the presence of hydrogen;
- and
- (d) thermolyzing said reduced catalyst,
- wherein said catalyst is purged under a flow of inert gas between each step.
Dependencies are inferred from the claim text.