MOFs衍生复合氧化物载体上Pd组分分散性与NGVs尾气催化净化性能

杨佳豪; 岳焮羽; 廖万年; 刘来君; 唐富顺

doi:10.3969/j.issn.1001-2222.2023.04.005

车用发动机 ›› 2023, Vol. 0 ›› Issue (4) : 29-36. DOI: 10.3969/j.issn.1001-2222.2023.04.005

栏目

MOFs衍生复合氧化物载体上Pd组分分散性与NGVs尾气催化净化性能

杨佳豪，岳焮羽，廖万年，刘来君，唐富顺

作者信息 +

Dispersion of Pd Component on MOFs-Derived Composite Oxide Carrier and Catalytic Purification of NGVs Exhaust

YANG Jiahao，YUE Xinyu，LIAO Wannian，LIU Laijun，TANG Fushun

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文章历史 +

摘要

通过CeZr-BTC和CeNi-BTC双金属MOFs材料为前驱体制备了多孔CeNiO_x和CeZrO_x复合金属氧化物，并考察了对Pd组分的分散热稳定性及天然气燃料汽车（NGVs）三效催化性能改善的构效关系。试验结果表明，制备的负载型1%Pd/CeNiO_x和1%Pd/CeZrO_x催化剂上Pd组分分散度可分别达到约46.3%和39.9%，经800 ℃和8 h空气气氛下老化后Pd物种粒子大小分别约为5.7 nm和7.3 nm，仍表现出较好的分散粒度和储氧性能。相对地，Pd/CeNiO_x催化剂上Pd物种粒子稳定性更佳，催化剂的储氧量也更高，老化后的模拟NGVs尾气三效净化催化低温活性更佳，尤其是NO和CH₄催化转化性能更优，CO，NO和CH₄的转化温度T₅₀分别可达120，206，370 ℃，T₉₀别可达180，330，480 ℃，但CH₄的转化温度仍偏高。通过具有丰富孔道结构的MOFs材料来衍生制备复合金属氧化物载体，可以适度改善Pd组分的分散热稳定性，并提供更多的可吸附位点和氧空位，从而改善NGVs三效催化性能。

Abstract

The porous CeNiO_x and CeZrO_x composite metal oxides were prepared by using CeZr-BTC and CeNi-BTC bimetallic MOFs materials as precursor and the structureactivity relationship of improving the thermal stability of Pd component dispersion and the three-way catalytic performance of natural gas vehicles(NGVs) was investigated. The experimental results showed that the dispersions of Pd components on the prepared supported 1%Pd/CeNiO_x and 1%Pd/CeZrO_x catalysts reached about 46.3% and 39.9% respectively. The particle sizes of Pd species were about 5.7 nm and 7.3 nm and the catalysts still showed the better disperse particle sizse and oxygen-carrying properties after the aging of 800 ℃ and 8 h. Relatively, Pd particles on Pd/CeNiO_x catalyst had the better stability and higher oxygen storage, and after aging the three-way purification of simulated NGVs exhaust had the better lowtemperature catalytic activity, especially for NO and CH₄. The respective conversion temperature of CO, NO and CH₄ conversion could reach 120 ℃, 206 ℃ and 370 ℃ for T₅₀ and 180 ℃, 330 ℃ and 480 ℃ for T₉₀, and the conversion temperature of CH₄was still too high. Accordingly, the preparation of composite metal oxide carrier derived from MOFs material with pore-rich structure could moderately improve the thermal stability of Pd component dispersion and provide more adsorption sites and oxygen vacancies and finally improve the threeway catalytic performance of NGVs exhaust.

导出引用

杨佳豪，岳焮羽，廖万年，刘来君，唐富顺. MOFs衍生复合氧化物载体上Pd组分分散性与NGVs尾气催化净化性能[J]. 车用发动机. 2023, 0(4): 29-36 https://doi.org/10.3969/j.issn.1001-2222.2023.04.005

YANG Jiahao，YUE Xinyu，LIAO Wannian，LIU Laijun，TANG Fushun. Dispersion of Pd Component on MOFs-Derived Composite Oxide Carrier and Catalytic Purification of NGVs Exhaust[J]. Vehicle Engine. 2023, 0(4): 29-36 https://doi.org/10.3969/j.issn.1001-2222.2023.04.005