Method for preventing W loss by capturing W catalyst in oxidative cracking reaction

Abstract

The invention discloses a method for preventing W loss by capturing a W catalyst in oxidative cracking reaction. The method particularly includes the steps: uniformly mixing a solid adsorbent, the W catalyst, hydrogen peroxide and reaction substrates; performing stirring reaction on mixture; centrifugally separating solid after reaction is completed; recycling the solid by a post-processing step;mixing the solid, the hydrogen peroxide and the reaction substrates; repeating catalytic reaction. W dissolved in reaction solution is adsorbed by a SnO2 solid adsorbing agent, a carrier of the W is formed, activity of catalytic reaction cannot be reduced, the W is recycled and then can be repeatedly used for the catalytic reaction, the activity of catalytic reaction cannot be affected by the solid adsorbing agent, the solid adsorbing agent can be repeatedly used, SnO2 cannot decompose the hydrogen peroxide when the SnO2 has a high PZC value, the SnO2 added into WO3/H2O2 and H2WO4/H2O2 systems, tungsten-containing negative ions can be effectively dissolved, a new catalyst is combined, the W loss is prevented, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of catalyst recovery and reuse, in particular to a method for capturing a W catalyst in an oxidative cracking reaction to prevent W loss. Background technique [0002] The great achievements of the modern chemical industry are inseparable from the use of catalysts. Most of the chemical industry products are produced by means of catalytic processes. Catalytic processes are generally divided into homogeneous catalysis and heterogeneous catalysis. Homogeneous catalysis refers to the catalysis in which the catalyst and the reactants are in the same homogeneous phase, while heterogeneous catalysis refers to the catalysis of the catalyst and the reactants at the two-phase interface. Homogeneous catalysis has the advantages of uniform activity, high selectivity and less side reactions, but it is difficult to separate, recover and regenerate homogeneous catalysts. Heterogeneous catalysts have the advantages of eas...

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Problems solved by technology

Therefore, solids with high PZC values ​​are better adsorbents for the above-mentioned dissolved tungsten-containing anions, but most solids with high PZC values ​​are metal oxides (for example, Al 2 o 3 , MgO, etc.), will cause decomposition of hydrogen peroxide and affect the oxidation efficiency

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