Improving catalytic converter performance by controlling the structural and redox properties of Zr-doped CeO2 nanorods supported Pd catalysts

Abstract

The work herein introduces a facile and novel synthesis procedure for producing Zr-doped CeO2 nanorod catalysts applicable for upgrading the car catalytic converter system. Four different concentrations of Zr-doped CeO2 nanorods (5, 10, 15, and 20 mol%) were synthesized. Some characterization techniques were utilized to describe their structure. Pd metal was impregnated on the CexZr1−xO2–Al2O3. The activity and selective oxidation of the major pollutants from motor vehicles such as CO, NOx, and CH were studied in a down-flow microreactor. The Zr ions were successfully doped into the ceria lattice, positively influencing the specific surface area, which had a major impact on the efficiency of the catalyst. The optimum Zr-doped catalyst was found to be Pd/Ce0.8Zr0.2O2–Al2O3 with the highest surface area (SBET = 111) and higher activity at lowest oxidation temperature (T90%) of 205 and 360 for CO and CH and T70% of 460 for NOx. Pd/Ce0.8Zr0.2O2–Al2O3 showed potential to be used in the car catalytic converter system, resulting in the production of a cost-effective catalyst for a more efficient automotive industry.