Welcome to 3.091 Lecture 23 November 5, 2004
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Welcome to 3.091 Lecture 23
November 5, 2004
diffusion in molten
ferrous alloys
helium ingress into various oxide glasses
helium ingress into various oxide glasses
same glass different gases
catalytic converters for automobiles
x
º H2O, CO2
º CO2
* NOx º N2, O2, CO2
* Rh for NOx
why unleaded gasoline?
* (C2H5)4
function: 3-way catalyst promoting conversion of HCs, CO, and NO
* hydrocarbons * CO
GM tried over 1500 catalyst formulations before settling on the present combination:
* Pt-Pd for hydrocarbons and CO
Pb (tetraethyl lead) burns to produce PbO * PbO is volatile and on the catalyst will decompose to Pb * Pb alloys with precious metals poisoning them
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