초록 ▼

The useful life of SO.sub.X additives having a SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst component and a SO.sub.3 absorption component can be extended by employing each of these components as separate and distinct physical particles, pellets, etc., with each component having large proportions of

The useful life of SO.sub.X additives having a SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst component and a SO.sub.3 absorption component can be extended by employing each of these components as separate and distinct physical particles, pellets, etc., with each component having large proportions of certain ingredients and having small proportions of certain other ingredients.

대표청구항 ▼

[ What is claimed is:] [1.] A fluid SO.sub.x additive system comprising SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst particles and SO.sub.3 absorbent particles wherein:(1) the SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst particles comprise: (a) a SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst comprise

[ What is claimed is:] [1.] A fluid SO.sub.x additive system comprising SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst particles and SO.sub.3 absorbent particles wherein:(1) the SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst particles comprise: (a) a SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst comprised of a metal selected from the group consisting of a metal having an atomic number of at least 20, a metal from Group 1b of the Periodic Table, a metal from Group 2b of the Periodic Table, a metal from Groups III to VIII of the Periodic Table and a rare earth metal of the Periodic Table; and (b) a binder selected from the group of metal-containing compounds consisting of aluminum silicate, aluminum titanate, aluminum zirconate, magnesium aluminate, magnesia, alumina, aluminum hydroxide, clay, zirconia, titania, silica, clay/phosphate material, bastnaesite and which, if employed at all, contains no more than about 10 weight percent aluminum hydroxide and no more than about 10 weight percent alumina (Al.sub.2 O.sub.3); and(2) the SO.sub.3 absorbent particles are physically separate and distinct from the SO.sub.2 .fwdarw.SO.sub.3 oxidation catalyst particles and comprise a metal oxide selected from the group consisting of magnesia, alumina and calcium oxide.