Molten salt templated nanoarchitectonics of mesoporous 2D carbon-doped boron nitride nanosheets with high oxidative thermal stability for efficient thermocatalytic CO2 methanation

Document Type

Article

Publication Date

1-1-2026

Abstract

Metal-doped boron nitride shows good promise for thermocatalytic CO2 methanation; however, it suffers from poor thermal stability and limited metal dispersion. Herein, a thermally stable nickel-supported mesoporous carbon-doped boron nitride (Ni/mC–BN) system is designed using a novel dual molten-salt strategy to enhance not only thermal-oxidative stability but also porosity, thereby facilitating enhanced nickel incorporation and high dispersibility. The carbonization of aminoguanidine, boric acid, and glucose at 1000 °C yielded a mC–BN material with a reasonably high surface area of 263.1 m2 g−1. Thermogravimetric analysis confirmed that mC–BN is highly stable in air, CO2, and N2 up to 700 °C. By using mC–BN as a support matrix, nickel nanoparticles (5–25 wt%) were successfully incorporated onto its surface via wet impregnation at 80 °C, followed by simultaneous calcination and reduction (SCR) at 450 °C. Density functional theory (DFT) calculations provided strong evidence of weak physisorption in pristine BN and mC–BN and strong chemisorption in Ni/mC–BN, thereby facilitating CO2 activation. The optimized material, 20%Ni/mC–BN, achieved a CO2 conversion of 74%, a CH4 selectivity of 96%, and a CH4 yield of 71% at a relatively low temperature of 350 °C. Time-on-stream (TOS) stability tests (62-hour run) demonstrated no coke formation or deactivation.

Publication Title

Ees Catalysis

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