LaFe 0.8 Co 0.15 Cu 0.05 O 3 Supported on Silicalite-1 as a Durable Oxygen Carrier for Chemical Looping Reforming of CH 4 Coupled with CO 2 Reduction.

Chemical looping reforming of CH 4 coupled with CO 2 reduction is a novel technology for the utilization of CH 4 and CO 2 . Here, we report a durable and outstanding LaFe 0.8 Co 0.15 Cu 0.05 O 3 /S-1 oxygen carrier at lower operating temperature to efficiently convert CH 4 and utilize CO 2 . LaFe 0.8 Co 0.15 Cu 0.05 O 3 showed a high CH 4 reaction rate (7.0 × 10 -7 mol·(g·s) -1 ), CO selectivity (84.2%), and CO yield (0.045 mol·g -1 ) at 800 °C. However, the reactivity of LaFe 0.8 Co 0.15 Cu 0.05 O 3 reduced quickly with the redox cycles. The introduction of Silicalite-1 promoted the performance of the LaFe 0.8 Co 0.15 Cu 0.05 O 3 perovskite oxygen carrier during the redox cycles. It can be attributed to the fact that under heat treatment, the LaFe 0.8 Co 0.15 Cu 0.05 O 3 particles grew along the edge of Silicalite-1 and the LaFe 0.8 Co 0.15 Cu 0.05 O 3 nanoparticles were homogeneously dispersed on the Silicalite-1 surface, which improved the thermal stability and reactivity of the oxygen carrier. In addition, the interface between Silicalite-1 and LaFe 0.8 Co 0.15 Cu 0.05 O 3 nanoparticles also played important roles because the porous structure of Silicalite-1 could reduce the mass transfer restriction of the interface. In addition, Silicalite-1 also possessed high CH 4 and CO 2 adsorption selectivity, leading to higher reactivity.