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Catalytic Support for Mass Transfer

IP.com Disclosure Number: IPCOM000012238D
Publication Date: 2003-Apr-22
Document File: 159 page(s) / 3M

Publishing Venue

The IP.com Prior Art Database

Abstract

A honeycomb monolith as mass transfer catalyst support that contains a high cell density inside a primary reactor of, for example, a motor vehicle. The honeycomb monolith diffuses the molecules from the bulk of the reactant flow to the surface of the catalytic materials so that they may react.

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CATALYTIC SUPPORT FOR MASS TRANSFER

It is well known to use a honeycomb monolith as mass transfer catalyst support that contains a high cell density inside a primary reactor of, for example, a motor vehicle.� The honeycomb monolith diffuses the molecules from the bulk of the reactant flow to the surface of the catalytic material so that they may react.

In general, reaction systems that are partially or entirely mass transfer controlled contain a mass transfer catalyst support.� Two types of mass transfer catalyst supports are foam axial flow substrates and honeycomb monolith substrates.� It is shown below that the honeycomb monolith substrate provides better performance and lower pressure drop than the foam axial flow substrates.� In addition, it is shown below that a mass transfer catalyst support that contains a high cell density provides performance gains for hydrocarbon fuel reforming.� The high cell density shortens the path, or distance, the molecules of the reactant mixture must travel to reach the surface of the catalytic.�

� The primary reactor comprises a catalyst that reacts with a reactant mixture.� The catalyst is placed on a catalytic support that lies within the primary reactor.� The reactant mixture flows through the catalyst support in order to contact the catalyst.� The catalyst support comprises a plurality of finely divided flow passages extending therethrough. Such monolith substrates are often referred to as "honeycomb monoliths.”� Thus, when the reactant mixture encounters the catalyst support, the reactant mixture travels through the flow passages within the catalyst support to react with the catalyst.

Tests show that ceramic and metallic monolithis reactors perform better than the foam monolith reactors.� The primary reformer test station was designed to reform up to 25 kWth of hydrocarbon fuel at pressures up to 4bara. The system was flexible enough to allow exchange of reactors of varying dimensions.

The general procedure is shown in Fig.1.� A superheated steam and air mix is used to indirectly heat the gasoline. The vaporized feeds then mixed at the neck of the reactor before passing through the primary reformer catalyst bed.

Figure 1

Primary

reformer

 

A schematic of the test station is shown in Appendix 1. The thermocouple locations in the vaporization section are shown in Appendix 2.� The system consisted of a pressurized fuel supply loop, a pressurized water supply loop, and air/nitrogen supply and mass flow control, a steam generator unit (electric), a gas pre-heat section (electric), a gasoline vaporization coil, a component mixing section, a primary reformer section, a 1” exhaust system, a reformate cooling and condensate collection, a dry flow measurement, and an on-line sample conditioning and analysis.� The pressurized fuel supply loop includes a pump, piston flowmeter and injector.� The pressurized water supply loop includes a pump, turbine flowmeter and injector.� The steam generator used was designed...