The carrier effect of ternary solid solution derived by trimetallic CeZrNi MOFs on the Pd dispersion stability for NGVs exhaust purification

Abstract This article was the first to prepare CeZrNiO x ternary solid solution using CeZrNi BDC MOFs as a template, and investigate its effect on improving the dispersion stability of Pd components in three‐way catalysts and the catalytic performance of natural gas exhaust purification. The experimental results indicated that CeZrNiO x derived from CeZrNi‐BDC MOFs had a stable solid solution uniform structure and relatively good thermal stability of the porous structure. Therefore, the thermal stability of Pd/CZN−M derived from CeZrNi BDC MOFs was significantly better than that of Pd/CZN−C prepared by citric acid complexation method. The PdO particle size of Pd/CZN−M before and after thermal aging was only about 2.0 and 4.5 nm, respectively. At GHSV50000 ml/(g⋅h), the T 90 of aged Pd/CeZrNiO x for CH 4 , NO, and CO reached 410, 370, and 175 °C, respectively, showing better three‐way catalytic (TWC) activity than reported in existing literature. In addition, CeZeNiO x carriers derived from MOFs also enhanced the co‐activation ability of NO and CH 4 , and exhibited certain activity in the low‐temperature self‐decomposition reaction of NO, thus showing significant advantages in the TWC catalytic activity of NGVs. This work would provide a new method for preparing NGVs exhaust TWC catalysts with high dispersion stability.