Composition cycling of an SO2 oxidation reactor

✍ Scribed by J.P. Briggs; R.R. Hudgins; P.L. Silveston

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 633 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)80147-4

✦ Synopsis

Expenments are described m which the second stage of a two-bed catalytic reactor IS used to study the catalytic oxidation of SO2 over a potassium-promoted V,O, catalyst Feed to the system consisted of 12 4% SO, m a~ Stage 1 served as a preconverter to react 90% of the entermg SO, to SO, The feed to the second stage reactor was cycled m step changes each of 13 mm duration between pure air and Stage 1 effluent The temperature of Stage 2 was 407 2 1°C When the feed to Stage 2 IS contmuously cycled the rate of oxldatlon SO, m Stage 2 IS higher than when Stage 2 IS operated continuously Mass spectrometnc measurements of the tune-resolved relative ratio of SO, m the output from the Stage 2 reactor, coupled with measurements of the catalyst temperature m Stage 2, demonstrate that SO, IS sorbed onto the catalyst when Stage 1 effluent IS fed to Stage 2 and desorbed when aa is fed to Stage 2 A tentauve c xplanation for the increased rate of SO, oxidation observed IS presented It IS suggested that SO, m the catalyst phase or potassmm pyrosulfo-vanadate, formed by reaction between the V4' species and sulfur trroxlde reduces the activity of the catalyst