Preparation method and equipment of calcination-free low-temperature denitration catalyst
By oxidizing metal salts in hydrothermal reaction and modifying montmorillonite, MMnTiOx/OMt catalyst was prepared, which solved the problem of the existing low-temperature NH3-SCR catalyst being easily deactivated under the coexistence of H2O and SO2, achieving efficient low-temperature denitrification effect, and reducing preparation energy consumption and process complexity.
CN119657230APending Publication Date: 2025-03-21BEIJING YUZHI ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information
- Application Number
- CN202411653663.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-03-21
AI Technical Summary
Technical Problem
The existing low-temperature NH3-SCR catalysts are prone to deactivate under the coexistence of H2O and SO2, and the preparation process is complex and energy consumption is high, making it difficult to meet the needs of efficient denitrification under low-temperature conditions.
Method used
The metal salt was oxidized in the hydrothermal reaction using a strong oxidant to prepare the active component oxide, and the montmorillonite was modified into organic montmorillonite. The active component was loaded onto the support by ball milling to prepare the MMnTiOx/OMt catalyst.
Benefits of technology
The NOx conversion rate is >95% and N2 selectivity is >90% within 100-180°C, and the energy consumption of catalyst preparation is reduced and the process flow is simplified.
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Abstract
The invention provides a preparation method of a calcination-free low-temperature denitration catalyst and the catalyst, and belongs to the technical field of preparation of denitration catalysts.The method comprises the steps that a strong oxidant is added into a mixed salt solution for a hydrothermal reaction, and an active component oxide is obtained; the preparation method comprises the following steps: adding montmorillonite into deionized water, adding an organic modifier in a stirring state, and carrying out a hydrothermal reaction to obtain organic montmorillonite; the active component oxide and the organic montmorillonite are subjected to ball milling, tabletting and screening, and the calcination-free low-temperature denitration catalyst is obtained. According to the preparation method, montmorillonite modified by an organic modifier is taken as a carrier, an active component oxide is prepared by using an oxidation-reduction method, and the active component oxide is loaded on the carrier by using a ball milling method, so that the obtained MMnTiOx / OMt catalyst can be used for NH3-SCR (Selective Catalytic Reduction) denitration treatment of low-temperature flue gas after dust removal-desulfurization, and the conversion rate of NOx is greater than 95% and the selectivity of N2 is greater than 90% within 100-180 DEG C.
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