摘要:
A catalyst for purifying the exhaust gases of internal combustion engines by means of oxidation and reduction with a reduced tendency to store sulfur oxides and to emit H.sub.2 S contains active Al.sub.2 O.sub.3 as carrier which is charged with CeO.sub.2 and optionally with ZrO.sub.2 as well as with platinum, and/or palladium, and optionally rhodium and also contains in addition 0.7 to 20% by weight B.sub.2 O.sub.3 relative to Al.sub.2 O.sub.3.
摘要翻译:通过氧化和还原的方式来净化内燃机废气的催化剂具有降低的存储硫氧化物的倾向并且排出H 2 S的催化剂,其含有作为载体的活性Al 2 O 3作为载体,其中CeO 2和任选地含有ZrO 2以及铂,并且 /或钯,和任选的铑,并且还相对于Al 2 O 3还含有0.7至20重量%的B 2 O 3。
摘要:
A coating dispersion is shown for the production of catalysis-promoting coatings on an inert, structure-reinforcing element. The solids of the dispersion are present in various particle fractions and lead to a relatively rough coating surface with improved exchange between the exhaust gas and the catalyst surface. This results in improved heat-up behavior of the catalyst.
摘要:
A process and apparatus for accelerating the rate of heating of a fixed bed catalyst to a light-off temperature for a catalytic reaction is disclosed. Supplementary energy from an external energy source is provided to a predetermined area of the catalyst bed for a limited period of time. The fixed bed catalyst may be present as a solid body or in bulk form and has a gas inlet area defined by a cross-section of the flow through channels of the reaction media. The supplementary energy is supplied to one or more isolated sections of the gas inlet area of the catalyst. Such a system significantly reduces the energy required in order to effectuate at least partial conversion of harmful emissions during initial operation of the converter.
摘要:
A coating dispersion is shown for the production of catalysis-promoting coatings on an inert, structure-reinforcing element. The solids of the dispersion are present in various particle fractions and lead to a relatively rough coating surface with improved exchange between the exhaust gas and the catalyst surface. This results in improved heat-up behavior of the catalyst.