Mesoporous saPO-34 molecular sieve-based catalyst with water resistance for catalytic oxidation of vocs and preparation method

By loading highly dispersed transition metal oxides onto mesoporous SAPO-34 molecular sieves, a catalyst with high mass transfer performance and hydrothermal stability is formed, solving the problems of easy deactivation of noble metals and easy deactivation of transition metals upon contact with water. This achieves low-temperature, high-efficiency catalytic oxidation of VOCs and water resistance. The catalyst preparation process is simple, safe, and economical.

CN118356969BActive Publication Date: 2026-06-12HUADIAN ELECTRIC POWER SCI INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUADIAN ELECTRIC POWER SCI INST CO LTD
Filing Date
2024-03-25
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing catalytic oxidation technologies for VOCs, precious metal catalysts are expensive and prone to sintering and deactivation, while transition metal catalysts have low activity at high temperatures and are easily deactivated by water, making it difficult to meet the requirements for efficient, low-cost, and water-resistant treatment.

⚗Method used

Mesoporous SAPO-34 molecular sieves were used as a support, and highly dispersed transition metal oxides were loaded onto them by a one-step liquid-phase etching and precipitation method to form a catalyst with high mass transfer performance and hydrothermal stability. Oxalic acid was used to complex metal elements and anchor them on the mesoporous surface to form highly active redox sites.

🎯Benefits of technology

It achieves the ability to catalyze the oxidation of VOCs at low temperatures and maintains its activity in the presence of water, reducing energy consumption and enhancing the water resistance of the catalyst. The catalyst preparation process is simple, safe and economical.

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Abstract

The application discloses a mesoporous SAPO-34 molecular sieve-based catalyst capable of catalyzing oxidation of VOCs and resisting water and a preparation method, oxalic acid is used as an etching agent and a precipitating agent, and through one-step liquid-phase etching and precipitation, mesopores are formed by etching the SAPO-34 molecular sieve, and transition metals are anchored to the mesopores and outer surfaces of the SAPO-34 molecular sieve; on one hand, the formation of the mesopores promotes diffusion and mass transfer of reactants on the catalyst, and on the other hand, the complexation and anchoring of the oxalic acid increase the dispersity of metal active sites and redox activity; in addition, the excellent hydrothermal stability of the SAPO-34 molecular sieve can also protect the active sites from being poisoned by H2O in the reaction process; the catalyst realizes more than 90% complete catalytic oxidation of p-toluene at 224 DEG C, and maintains 100% complete catalytic oxidation of p-toluene for 1440 min continuously under the condition of 240 DEG C and 5% H2O, and the efficiency does not attenuate.
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