SOX transfer catalysts

Catalytic Reduction of SO3 Stored in SOx Transfer Catalysts -A Temperature-Programmed Reaction Study... 

Properties Water-wh. to pale yel. liq. sol. in ether, alcohol insol. in water m.w. 202.44 dens. 0.849 (15.5/15.5 C) m.p. -7 C b.p. 274-278 C flash pt. (OC) 127 C ref. index 1.4589 Toxicology Irritant avoid contact and inh. strong sensitizer mutagenic data TSCA listed Precaution Combustible Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of SOx Uses Catalyst accelerator for unsat. polyester resins modifier in polymerization reactions, esp. for SBR reducing initiator chain transfer agent for styrene-butadiene/chloroprene rubber prod. In food-pkg. adhesives adjuvant in food pkg. 

In the laboratory, the two deactivation mechanisms can be separated by steaming the cracking catalyst and Additive R separately. In this case, there can be no transfer of silica from the cracking catalyst to Additive R during the steaming. The Additive R only loses surface area. The steamed components are then blended together for SOx activity measurements. 

Our results on silica transfer from the cracking catalyst to Additive R are similar to results reported by Byrne, Speronello and Leuenberger (2) on an Engelhard SOx additive. They showed that silica did transfer from the cracking catalyst to their SOx additive during steaming and during use in a commercial unit, and that the silica deactivated their SOx additive. 

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