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If the catalyst and reaction conditions are indicative of low effectiveness, selective poisoning may be observed, where poisoning of only a small fraction of the catalyst's surface gives a disproportionately large drop in activity. [4] If η is the effectiveness factor of the poisoned surface and h p is the Thiele modulus for the poisoned case:
Arctic Cat is an American brand of snowmobiles and all-terrain vehicles manufactured in Thief River Falls, Minnesota. The company was formed in 1960 and is now part of Textron Inc. Arctic Cat designs, engineers, manufactures, and markets all-terrain vehicles , snowmobiles and related parts, garments (such as snowmobile suits ), and accessories.
The Proterra Catalyst was an evolution of the EcoRide, initially available as a standard 40-foot (12 m) transit bus length in 2014 with the same fast-charging battery as the EcoRide and a similar composite chassis. [27] A 35-foot (11 m) Catalyst was introduced in 2015 to directly replace the earlier EcoRide.
The company emerged from bankruptcy and continues on today as Arctic Cat. Polaris began developing a smaller consumer-sized, front-engine snowmobile to compete with the Ski-Doo in the early 1960s. In 1964, Polaris released the Comet. However, the Comet soon ran into problems as it could not travel in all types of snow conditions.
The Thundercat series was introduced in 1993, as Arctic Cats entry into the Musclesled category. [1] These sleds feature extremely powerful engines placed in chassis derived from racing models. The first-gen featured a Suzuki-produced, counterbalanced case-reed triple cylinder 2-stoke 900cc engine, which produced 161.5 horsepower .
A three-way catalytic converter on a gasoline-powered 1996 Dodge Ram Simulation of flow inside a catalytic converter. A catalytic converter is an exhaust emission control device which converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction.
A true catalyst can work in tandem with a sacrificial catalyst. The true catalyst is consumed in the elementary reaction and turned into a deactivated form. The sacrificial catalyst regenerates the true catalyst for another cycle. The sacrificial catalyst is consumed in the reaction, and as such, it is not really a catalyst, but a reagent.
The monolith is a substrate that supports a catalyst. After the monolith is complete, a washcoat is applied that deposits oxides and catalyst(s) (most commonly platinum, palladium, and/or rhodium) on the walls of the holes. Alternative structures include corrugated metal and a packed bed of coated pellets or other shapes.