Regeneration method for SCR (Selective Catalytic Reduction) denitration catalyst V2O5-WO3/TiO2

Abstract

The invention discloses a regeneration method for an SCR (Selective Catalytic Reduction) denitration catalyst V2O5-WO3 / TiO2. The method comprises the following four steps: (1) carrying out impurity removal; (2) carrying out first-time high-temperature treatment; (3) carrying out activity regeneration; (4) carrying out second-time high-temperature treatment. According to the regeneration method, one or a mixture solution of more of a cerous nitrate solution, a cerous acetate solution, a manganous nitrate solution and a manganese acetate solution is adopted as an active solution, so that the denitration efficiency of the regenerated SCR denitration catalyst V2O5-WO3 / TiO2 is obviously increased, and the temperature range of a denitration reaction can be effectively widened; meanwhile, a template agent is added, so that the distribution of active substances is more uniform, and the activity recovery is facilitated. The regeneration method provided by the invention is simple and easy in control, and required equipment is readily available and cheap; compared with the existing regeneration methods, the regeneration method has greater technical and economic advantages, thereby having powerful market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of SCR denitration catalysts, in particular to a SCR denitration catalyst V 2 o 5 -WO 3 / TiO 2 regeneration method. Background technique [0002] At present, my country's energy structure is dominated by coal, and nitrogen oxides (NOx) emitted after coal combustion is one of the main pollutants in the atmosphere. One of the important root causes of the problem has gradually aroused extensive attention of scholars at home and abroad. Selective catalytic reduction technology (SCR) is a technology that eliminates nitrogen oxide pollution under the action of a specific catalyst. It has the characteristics of high efficiency and practicability, and is currently the most widely used denitrification technology. with V 2 o 5 -WO 3 / TiO 2 The catalyst-based SCR technology is currently the most widely used SCR denitrification technology due to its high denitrification efficiency and stable operation. However,...

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Problems solved by technology

[0003] The Chinese invention patent application with the publication number CN201410145019.5 discloses a regeneration method for SCR catalysts. In this method, the active regeneration solution is sprayed on the deactivated SCR catalyst after heat treatment, and then SO 2 Acidification treatment can improve the activity of the deactivated catalyst to a certain extent. This method is simple to operate and has strong adaptability. However, the reaction temperature range of the denitrification reaction catalyzed by the catalyst after the catalytic activity is improved by this regeneration method cannot be widened. At the same time, its activity The degree of improvement is also very limited and cannot fully meet the needs of practical applications.

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