One-pot fabrication of waste granular silica gel (WGSG) supported nickel catalysts for dry reforming of methane

Surface Reactive Oxygen from Support Corrects the Nominal Supported Metal Size Effect in Controlling the Reactivity for Low-Temperature CH4/CO2 Reforming

“…At 0.3 min, the exclusive CO vibrational mode at 2096 cm –1 belongs to CO adsorbed on the single-atom Pt, according to our previous work . Meanwhile, CH 2 adsorption peaks at 2929 and 2841 cm –1 emerged, ,− indicating that CH 4 is activated on Pt 1 with CH 2 as the superfluous intermediates (Figure c, Initialization). At 0.6 min, a new CO vibrational mode around 2021 cm –1 was observed, which was assigned to CO adsorbed on low-coordination metallic Pt atoms. − Meanwhile, the peak at 2096 cm –1 broadened and evolved a shoulder at 2120 cm –1 , representing CO adsorbed on Pt­(II) at the interface of metallic Pt NPs and the ceria support. ,, Simultaneously, the peak at 2723 cm –1 attributable to aldehyde hydrogen (CHO) species was observed, − the key intermediate verifying that CH x combines with SRO to yield H 2 and CO (without carbon) directly. , However, it vanished at 0.9 min.…”