The porous CeNiOx and CeZrOx composite metal oxides were prepared by using CeZr-BTC and CeNi-BTC bimetallic MOFs materials as precursor and the structureactivity 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/CeNiOx and 1%Pd/CeZrOx 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/CeNiOx catalyst had the better stability and higher oxygen storage, and after aging the three-way purification of simulated NGVs exhaust had the better lowtemperature 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 CH4 was 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 threeway catalytic performance of NGVs exhaust.
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
.
DOI: 10.3969/j.issn.1001-2222.2023.04.005
