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Hydrodesulphurizer Mixed HDS catalyst/ZnO Monolith
The Hydrosulpherization catalyst and sulphur absorbent materials for use in a Hydrosulpherizater are combined in the form of a monolith, rather than as pellets.
The general concept behind the HDS reactor is that the hydrodesulphurization catalyst is in intimate contact with the sulfur adsorbant material; such that the sulfur can be removed by the ZnO adsorber before the catalyst gets poisoned.
Currently, the HDS is comprised of ZnO pellets mixed with Pt/Pd catalyst pellets. It is desired to reduce the cost of this catalyst bed by improving the utilization of the precious metals to convert sulfur compounds in gas phase hydrocarbons to H2S and the ZnO for adsorbing the resulting H2S. It is further desired to reduce the pressure drop through the bed by switching from pellets to monoliths.
This disclosure teaches, in one embodiment, the use of a honeycomb or foam monolith composed of cordierite and wash coated with ZnO and Pt/Pd catalyst. The ZnO and HDS catalyst would be wash coated onto the support in alternating fashion.
In another embodiment, coat the Pt/Pd hydrodesulphurization catalyst is wash coated directly on a foam or honeycomb monolith entirely of ZnO. Such as ZnO monolith may be made by extrusion. This embodiment has the advantage in that almo...