Solid silica-based Anderson type molybdenum-containing heteropoly acid catalyst and application thereof

Abstract

The invention discloses a solid silica-based Anderson type molybdenum-containing heteropoly acid catalyst and application thereof. The catalyst comprises the following steps of adding a silica porousmaterial and an amino functional group coupling agent into a dilute acid solution with pH of 3-4, stirring with magnetic at the room temperature for 12-24 h, adding Anderson type molybdenum-containingheteropoly acid and a surfactant, vibrating with ultrasonic for 0.5-1h, transferring the solution into a hydrothermal reactor, using an oven with programmed heating, raising the reaction temperaturefrom the room temperature to 150-180 DEG C within 0.1-1 h, maintaining the temperature for 48-72 h, then cooling the reaction temperature naturally to the room temperature, washing several times withultrapure water and ethanol respectively, and filtering and drying for 10-12 h. The catalyst can effectively catalyze hydrogen peroxide to oxidize iodide ion under heterogeneous conditions to produceiodine elemental, a reaction condition is mild, the utilization rate of hydrogen peroxide is high, environmentally friendly and pollution-free are achieved, peroxidation does not exist, thermal stability is good, and the catalyst can be reused for many times and is easy to recycle.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a preparation method and application of a solid silicon-based Anderson type molybdenum-containing heteropolyacid catalyst. Background technique [0002] Iodine is an important chemical raw material, which is widely used in cutting-edge technologies such as medicine, agriculture, dyes, metallurgy, synthetic rubber, and national defense technology. With the continuous expansion of the application field of iodine resources, the global demand for iodine is also becoming stronger. At present, the main sources of iodine in the world are saltpeter, seaweed, underground brine and marine sedimentary phosphate rock. The common feature of these iodine sources is that the iodine equivalent is very low, resulting in a slow rate of oxidation of iodine ions into iodine element, low extraction rate and high production cost. Although iodine can be recovered by ion exchange, precipitation, e...

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Problems solved by technology

However, the catalytic efficiency of the currently used catalysts is relatively low, the recovery is poor, and the cost is high

For example, Chen Xiaohu et al. used sulfuric acid as a catalyst to catalyze the recovery of iodine oxidation, but the oxidation rate did not increase significantly.