Modulating metal-support interactions to improve anti-coking performance of La2O3 supported Ni catalysts for dry reforming of methane

Dry reforming of methane (DRM) is a chemical reaction with great potential to convert CH 4 and CO 2 into valuable syngas. However, catalyst deactivation due to sintering and coking is a major obstacle for practical applications. Here, we synthesized a hollow tubular Ni/La 2 O 3 -ES catalyst via electrospinning (ES) method that surpasses conventional Ni/La 2 O 3 catalysts in both activity and stability. The ES-driven architecture creates confinement-stabilized Ni nanoparticles with improved metal-support interaction and spatial uniformity, achieving 93 % CO 2 conversion and 85.0 % CH 4 conversion at 800 °C for 20 h of continuous operation, providing long-lasting performance with no accumulation of carbon deposition. The carbon removal ability is strengthened in the Ni/La 2 O 3 -ES catalyst as evidenced by the CH 4 -CO 2 -TPSR experiments. Ni/La 2 O 3 -ES catalyst prefer to produce more active intermediates b-HCOO* as indicated in in situ DRIFTS spectra. The b-HCOO* species served as the key reactive intermediate that facilitated both CO 2 activation and the oxidative transformation of CH 4 -derived carbonaceous intermediates on catalytic surface. Additionally, the catalyst prepared by electrospinning method promoted lattice oxygen release and oxygen vacancy formation, thereby exhibiting superior catalytic activity and stability.