Hydrothermal pretreatment for increasing average pore size in a catalyst support
AssigneeConocoPhillips Company
InventorsDaxiang Wang, Tianyan Niu, Gloria I. Straguzzi, Harold A. Wright, Robin G. Cnossen
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Abstract
A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor η. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.
Claims37
A method for increasing the average pore size of a catalyst support, the method comprising the step of:
- calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size such that the average pore size is increased by a factor of 2 to 10 during calcination and the resulting calcined support has a total pore volume equal to or less than 0.14 cc/g.
A partial oxidation catalyst comprising:
- a porous support;
- and
- a catalytically active metal dispersed on the support,
- wherein the support has been calcined in moisturized air at an elevated temperature sufficient to increase the average pore size by a factor of 2 to 10 during calcination and the resulting calcined support has a total pore volume equal to or less than 0.14 cc/g.
A method for preparing a partial oxidation catalyst comprising, the method comprising the steps of:
- a) calcining a support material in moisturized air at an elevated temperature sufficient to increase the average pore size by a factor of 2 to 10 during calcination and the resulting calcined support has a total pore volume equal to or less than 0.14 cc/g;
- and
- b) loading the support material with a catalytically effective amount of a precious metal to form the partial oxidation catalyst.
Dependencies are inferred from the claim text.