介孔La1-xSrxMnO3催化剂的COK-12纳米浇铸法制备

摘要/Abstract

摘要： 钙钛矿型催化剂在汽车尾气净化方面具有良好的应用潜力。本文以表面活性剂P123为软模板剂,廉价的硅酸钠为硅源,在近中性条件下制备了介孔材料COK-12。并以此为基础,以对二甲苯为扩容剂对COK-12进行改性,得到了大孔径、有序的介孔材料。随后以改性介孔材料为模板剂,采用纳米浇铸法结合溶胶-凝胶法制备了介孔La_0.8Sr_0.2MnO₃催化剂。结果显示,在550 ℃下合成的催化剂具有较大的比表面积(72.11 m²/g),表面Mn⁴⁺/Mn³⁺和O_ads/O_lat摩尔比最高。此外,样品的CO催化性能测试转化表明,550 ℃下合成的样品具有最好的催化活性和优秀的高温稳定性,其特征温度T₅₀和T₉₀分别为180和218 ℃。

关键词: COK-12, 介孔材料, 纳米浇铸法, 溶胶-凝胶法, CO催化

Abstract: Perovskite-type catalysts show promising potential in the purification of automobile exhaust. This paper discussed the synthesis of mesoporous material COK-12 using surfactant P123 as a soft template and inexpensive sodium silicate as the silicon source under nearly neutral conditions. Building on this, the mesoporous COK-12 was modified with p-xylene as a swelling agent, resulting in large-pore, ordered mesoporous materials. Subsequently, for the first time, modified mesoporous materials were used as templates for the preparation of mesoporous La_0.8Sr_0.2MnO₃ catalysts through nano-casting combined with the sol-gel method. The results demonstrate that the catalyst synthesized at 550 ℃ possesses a larger specific surface area (72.11 m²/g) and the highest molar ratio of Mn⁴⁺/Mn³⁺ and O_ads/O_lat on the surface. Additionally, CO catalytic performance tests of samples indicate that those synthesized at 550 ℃ exhibit the best catalytic activity and excellent high-temperature stability. Their characteristic temperatures T₅₀ and T₉₀ are 180 and 218 ℃, respectively.

Key words: COK-12, mesoporous material, nano-casting method, sol-gel method, CO catalysis

中图分类号:

O643.36

黄学辉, 胡祥奥, 陈文臻, 邓鹏辉. 介孔La_1-xSr_xMnO₃催化剂的COK-12纳米浇铸法制备[J]. 硅酸盐通报, 2024, 43(8): 3079-3088.

HUANG Xuehui, HU Xiang’ao, CHEN Wenzhen, DENG Penghui. Preparation of Mesoporous La_1-xSr_xMnO₃ Catalysts via COK-12 Nano-Casting Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 3079-3088.

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介孔La_1-xSr_xMnO₃催化剂的COK-12纳米浇铸法制备

Preparation of Mesoporous La_1-xSr_xMnO₃ Catalysts via COK-12 Nano-Casting Method

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