Metal–organic frameworks derived Ce0.3Ni0.7Oxcarrier improve Pd dispersion and three-way catalytic performance

The effect of MOFs-derived Ce0.3Ni0.7Oxcarrier (CN-M) on Pd dispersion states for three-way catalytic (TWC) performance of natural gas vehicles (NGVs) comparing with Ce0.3Ni0.7Oxcarrier (CN-C) prepared by citric acid complexation method has been studied. The results showed that the Pd/CN-M catalyst displayed better Pd dispersion (46.3%) and much higher activity for the conversions of CO, NO and CH4. Both T50and T90of CO conversion over Pd/CN-M were lower ca. 100 °C than that over Pd/CN-C catalyst, T50and T90of NO conversion were same trend with lower degree ca. 150 °C, the CH4conversion of Pd/CN-M was also much better than that of Pd/CN-C. After thermal aging, the conversions of CO, NO and CH4of Pd/CN-M had a finite shift with 20–50 °C to high temperature. It showed unique structure, smaller crystal particles, higher metal dispersion, stronger reducibility, and higher adsorbed oxygen (Oα) on Pd/CN-M catalyst in comparison to Pd/CN-C, and dispersion thermal stabilization of Pd particles on Pd/CN-M catalyst was better than that on Pd/CN-C. This work maybe provides a new method for preparing TWCs with high active for NGVs.