Development of Beaded Three-Way Catalysts With Reduced H2S Emissions

Format:

Conference/Event

Author/Creator:

Ernest, Michael V., author.

Conference Name:

1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition (1989-09-25 : Baltimore, Maryland, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1989

Summary:

The introduction of more active and durable Three-Way Catalysts (TWCs) on vehicles with advanced fuel management systems has created a new emissions problem. Hydrogen sulfide emissions are responsible for the odor readily apparent during certain modes of vehicle operation such as sudden braking (deceleration) and quick starts (acceleration). Experimental work aimed at designing a laboratory test to characterize catalysts for their hydrogen sulfide emissions behavior has revealed the existence of a narrow oxidant/reductant window where H2S emissions reach a maximum. Efforts to develop catalysts with low H2S emissions when operating in that A/F window led to the conclusion that cerium oxide while an excellent choice for TWCs is a key contributor to the H2S problem. Manufacturers of beaded catalysts have been restricted from using nickel oxide, an effective H2S scavenger, over concern about its potential entry into the environment. This has prompted the search for novel preparative methods and new compositions that result in low H2S emissions while maintaining good TWC performance. The performance of several experimental catalysts having that combination of properties is illustrated by means of comparison with conventional beaded TWCs

Notes:

Vendor supplied data

Publisher Number:

892042

Access Restriction:

Restricted for use by site license