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US 5,935,889 AGranted
Catalyst and method of preparation
AssigneeABB Lummus Global Inc.
InventorsLawrence Lee Murrell, Rudolf Alfred Overbeek, Ali M. Khonsari
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AssigneeABB Lummus Global Inc.
InventorsLawrence Lee Murrell, Rudolf Alfred Overbeek, Ali M. Khonsari
Estimating the term…
Catalyst particles are prepared by coating a core particle, which is usually catalytically inert with respect to the intended chemical reaction, in a fluidized bed coating apparatus. The coating technique involves repeatedly applying and drying small quantities of an atomized slurry containing the coating material in the form of a colloidal dispersion or in the form of very fine, non-colloidal particles preferably mixed with colloidal particles. In this way, incremental layers are formed to produce a final thin shell which has a highly uniform thickness, which is formed on the surface of the core and which does not penetrate porous cores. Various methods are disclosed for converting the coated particles to the desired catalyst form.
In a process for producing a thin film catalyst comprising porous core particles and a thin film of catalyst thereon, the improvement comprising coating said porous core particles by contacting a fluidized bed of said porous core particles with an atomized spray of a liquid suspension of fine coating particles, at least a portion of said fine coating particles being colloidal particles and said fine coating particles being selected from the group consisting of particles possessing catalytic activity and particles adapted to be treated to produce catalytic activity, said fine coating particles being coated on the surface of said porous core particles to form a thin film essentially without any penetration into said pores.
A process for producing catalyst particles comprising porous core particles and a thin shell of catalyst deposited on the surface of said porous core particles comprising the steps of:
Dependencies are inferred from the claim text.