SILICA-RICH CARRIER, CATALYST FOR HETEROGENEOUS REACTIONS AND METHOD FOR THE PRODUCTION THEREOF

摘要

Invention provides high-silica carrier for catalysts used in following processes: high-extent oxidation of hydrocarbons (exhausted gas afterburning), hydrogenation (acetylene, nitrobenzene), partial oxidation of hydrocarbons (ethylene and propylene epoxidation), ammonia conversion (in nitric and hydrocyanic acids' production), etc. Carrier contains more than 70 wt % silicon oxide. In NMR MAS29Si spectrum, silicon state is characterized by presence of lines with chemical shifts 100+/- 3 ppm (line Q3) and 110 +/- 3 ppm (line Q4) at integral line intensity ratio Q3/Q4 from 0.7 to 1.2. In IR spectrum, there is a hydroxyl group absorption band with wave number 3620-3650 cm-1 and band halfwidth 65-75 cm-1. Carrier has specific surface measured by BET method from heat desorption of argon SAr = 10 to 250 sq.m/g and surface value measured by alkali titration method SNa - 10 to 250 sq.m/g with ratio SNa/SAr = 5 to 30. Unique physico-chemical properties of carrier enable preparation of efficient catalysts containing this carrier and at least one active ingredient selected from: platinum, palladium, rhodium, iridium, silver, zirconium, chromium, cobalt, nickel, manganese, copper, tin, gold, titanium, iron, molybdenum and/or their oxides in amounts not exceeding 2% (on conversion to metal). Active ingredient is introduced by bringing carrier into contact with solutions of corresponding minerals at temperature 40 to 200 C and pressure 1 to 200 atm.