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Title: Use of a molecular sieve bed to minimize emissions during cold start of internal combustion engines

Abstract

This patent describes a process for treating an engine exhaust gas stream containing hydrocarbons and other pollutants. It comprises directing the engine exhaust gas stream over an adsorbent zone comprising a molecular sieve bed which preferentially adsorbs the hydrocarbons over water, to provide a first exhaust stream, flowing the first exhaust stream over a primary catalyst to convert substantially all the pollutants contained in the first exhaust stream to innocuous products, thereby providing a treated exhaust gas stream and discharging the treated exhaust stream into the atmosphere, the process being carried out for a time until the molecular sieve bed temperature is about 150{degrees} C, at which time the engine exhaust gas stream is diverted completely away from the adsorbent zone and routed directly over the primary catalyst until such time as the primary catalyst reaches its operating temperature, at which time the engine exhaust gas stream is divided into a major and minor portion, flowing the major portion of the engine exhaust gas stream over the primary catalyst and then discharging the treated exhaust gas stream from the primary catalyst into the atmosphere.

Inventors:
;
Publication Date:
OSTI Identifier:
5661343
Patent Number(s):
US 5051244; A
Application Number:
PPN: US 7-556149
Assignee:
UOP, Des Plaines, IL (United States)
Resource Type:
Patent
Resource Relation:
Patent File Date: 20 Jul 1990
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 54 ENVIRONMENTAL SCIENCES; AIR POLLUTION CONTROL; INTERNAL COMBUSTION ENGINES; MOLECULAR SIEVES; USES; DESIGN; EXHAUST SYSTEMS; POLLUTANTS; ADSORBENTS; CONTROL; ENGINES; HEAT ENGINES; POLLUTION CONTROL; 330700* - Advanced Propulsion Systems- Emission Control; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-); 330100 - Internal Combustion Engines

Citation Formats

Dunne, S R, and Reber, R A. Use of a molecular sieve bed to minimize emissions during cold start of internal combustion engines. United States: N. p., 1991. Web.
Dunne, S R, & Reber, R A. Use of a molecular sieve bed to minimize emissions during cold start of internal combustion engines. United States.
Dunne, S R, and Reber, R A. Tue . "Use of a molecular sieve bed to minimize emissions during cold start of internal combustion engines". United States.
@article{osti_5661343,
title = {Use of a molecular sieve bed to minimize emissions during cold start of internal combustion engines},
author = {Dunne, S R and Reber, R A},
abstractNote = {This patent describes a process for treating an engine exhaust gas stream containing hydrocarbons and other pollutants. It comprises directing the engine exhaust gas stream over an adsorbent zone comprising a molecular sieve bed which preferentially adsorbs the hydrocarbons over water, to provide a first exhaust stream, flowing the first exhaust stream over a primary catalyst to convert substantially all the pollutants contained in the first exhaust stream to innocuous products, thereby providing a treated exhaust gas stream and discharging the treated exhaust stream into the atmosphere, the process being carried out for a time until the molecular sieve bed temperature is about 150{degrees} C, at which time the engine exhaust gas stream is diverted completely away from the adsorbent zone and routed directly over the primary catalyst until such time as the primary catalyst reaches its operating temperature, at which time the engine exhaust gas stream is divided into a major and minor portion, flowing the major portion of the engine exhaust gas stream over the primary catalyst and then discharging the treated exhaust gas stream from the primary catalyst into the atmosphere.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {9}
}