3,556,725 or CM-41 from Mobil Oil as pure SiO 2 material), and also such mesoporous silica gels up to 10% by weight of foreign elements (e.g. Catalyst for the oxidation of SO- to S0 2 and use of the catalyst in a process for the production of. Water is introduced in line (20), and the sulfuric acid running off in line (21) also reaches the collecting tank (12). 09600332, Country of ref document: % can be further processed in a main converter in accordance with the latest state of the art (eg Lurgi, Frankfurt), whereby SO and sulfuric acid are formed and a tail gas with an S0 2 content of less than 200 pp remains. 1998966365, Country of ref document: Catalyst according to claim 1 or 2, characterized in that the support to 90-100 wt.% Of mesoporous % iron. The result of this is that the gas which is given up to catalysis should have an S0 2 content of at most about 12% by volume, so that the exotherm of the oxidation reaction can be controlled well remains. AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE, Ref document number: A first, SO, -containing gas mixture leaves the pre-contact stage (1) in line (6) at temperatures in the range from 580 to 800 Â° C. and preferably 600 to 700 Â° C. This first gas mixture is cooled in the waste heat boiler (7) to temperatures of 50 to 300 Â° C, valuable high-pressure steam can be obtained from water. Iron vanadate can be applied in the same way to supports with a large surface area. The S0, content in the gas of line (2) is in the range from 13 to 50 vol.% And mostly at least 15 vol.%, The gas is preferably preheated to temperatures from 350 to 500.degree. The invention relates to a catalyst for converting SO2 with molecular oxygen into SO3. B. V 2 0 5 as an active component, preferably work in the temperature range from 380 to 620 Â° C. Higher temperatures damage the catalytic converter. 0.5 ml of a fraction with particle sizes between 500 and 1000 Î¼m was used for each catalyst Activation held at 324 Â° C in a nitrogen stream for three hours. The product was heated to 200 Â° C at 2 Â° C per minute, held at this temperature for 3 hours, then heated to 550 Â° C at 5 Â° C per minute and held at this temperature for 10 hours. 1 g of the product was mixed intensively with 3.5 ml of a 0.95 molar Fe (N0 3 ) solution and then dried at 90 Â° C. for 2.5 hours. A, Format of ref document f/p: Catalyst according to claim 1 or 2, characterized in that the support consists of 90 to 100% by weight of a zeolite. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS, Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium, Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof, Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. 580 to 800 C is that in the pre-contact stage 20 to 80% of the supplied So, is converted to SO3 and from the Samples of the three catalysts described were tested in the laboratory to determine their activity with regard to the oxidation of SO 2 to SO 3 . It has good thermal stability up to 1000 Â° C and a BET surface area of approximately 1000 m 2 / g. To 10 g of an aqueous 25% C 16 H 33 N (CH 3 ) 3 C1 solution, a mixture of 1.8 g of Na water glass (composition 27.5% by weight SiO 2 .8 , 3 wt .-% Na, 0, water), 1.3 g Si0 2 and 10 g water. Weight ratio carrier: Active component in the range from 1: 1 to 100: 1 is that the maximum temperature at the pre-contact DE-C-27 10 350 describes a catalyst for the conversion of S0 2 to S0 3 , which works in the temperature range from 600 to 800 Â° C. The catalyst has a silicon oxide support with a tridymite structure and an active component containing iron, copper and an alkali metal. The gas flowing upward in the second absorber (14) releases sulfuric acid droplets in the droplet separator (24) and then passes through the line (25) to a heater (26) which raises the temperature of the gas to 380 to 500 Â° C. The gas in line (27), which is also referred to here as the second gas mixture, has an SO 2 concentration of 10 to 30% by volume. 10 years ago. crystalline zeolites, Crystalline aluminosilicate zeolites; Isomorphous compounds thereof, Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts, ì¤ë¦¬ì¨ ìì§ëì´ë ì¹´ë³¸ì¤ ê²ì ë² í, ç¨äºåå¯»ç¸ç¡ è»åç å¶ç¡«é ¸ç¨éå¬åå, Method and system for particulate matter removal from a process exhaust stream, Prepn of active phase of vanadium catalyst for sulfuric acid production, Vanadium catalyst containing tungsten for producing acid by oxidation and preparation method thereof, Active and durable sulfuric acid catalyst, Method for producing a catalyst for the oxidation of sulfur dioxide to sulfur trioxide, Catalyst for the oxidation of sulfur dioxide to sulfur trioxide, Functional interior material and method for manufacturing the same, Promoted, attrition resistant, silica supported precipitated iron catalyst, Synthesis of ZSM-58 crystals with improved morphology, B-type iron silicate composition and method for reducing nitrogen oxides, Precipitated silicas, silica gels with and free of deposited carbon from caustic biomass ash solutions and processes, Self-assembly synthesis of organized mesoporous alumina by precipitation method in aqueous solution, Novel oxide materials and synthesis by fluoride/chloride anion promoted exfoliation, Shaped porous bodies of alpha-alumina and methods for the preparation thereof, Silicon- titanium mixed oxide powder, dispersion thereof and titanium- containing zeolite prepared therefrom, Process for producing wide-pore catalyst supports, Attrition resistant catalysts, catalyst precursors and catalyst supports, Mesostructured material with high aluminum content, Hydro-refining catalyst, carrier for use therein and method for production thereof, Process for slurry hydroconversion of heavy hydrocarbon charges in the presence of a dispersed active phase and an alumina oxide, Production and use of polysilicate particulate materials, Process for continuously producing geometric shaped catalyst bodies K, Very high structure, highly absorptive hybrid silica and methods for making same, Hierarchically order porous lotus shaped nano-structured MnO 2 through MnCO 3: chelate mediated growth and shape dependent improved catalytic activity, Oxidation catalyst and process for its preparation, Control of ordered structure and morphology of large-pore periodic mesoporous organosilicas by inorganic salt, A kind of magnalium hydrotalcite and the method for preparing magnalium hydrotalcite, OneâPot Synthesis of Catalytically Stable and Active Nanoreactors: Encapsulation of SizeâControlled Nanoparticles within a Hierarchically Macroporous Core@ Ordered Mesoporous Shell System, Molded porous article, method for production thereof, catalyst carrier, and catalyst, Entry into force of request for substantive examination.