La2–x Sr x Ce2–y Ni y O7 Catalysts with Interstitial Nickel for Enhanced Dry Reforming of Methane
Aathira Bhaskaran, Naga Pranava Sree Kothoori, Pralok K. Samanta, Stéphane Loridant, Patrick Da Costa, Satyapaul A. Singh, Sounak Roy
TL;DR
This study develops a new nickel-doped oxide catalyst that improves the efficiency of converting methane and carbon dioxide into hydrogen and carbon monoxide.
Contribution
The paper introduces a defect-engineered oxide catalyst with interstitial nickel for enhanced dry reforming of methane.
Findings
The catalyst La1.9Sr0.1Ce1.7Ni0.3O7 achieved over 70% conversion of CO2 and CH4 at 700°C.
Minimal coke deposition was observed due to the oxidative dissociation pathway of methane.
Metal–support interactions and electron transfer from Ni to Ce improved catalytic performance.
Abstract
This study explores the catalytic performance of solution combustion-synthesized doped defective fluorite catalysts, La2– x Sr x Ce2– y Ni y O7, for the dry reforming of methane. A comprehensive structural analysis, supported by theoretical calculations, revealed that the adopted synthetic methodology enabled Ni doping beyond a critical concentration, leading to its occupation of the interstitial lattice sites. The optimally doped Ni-containing defective fluorite oxide La1.9Sr0.1Ce1.7Ni0.3O7 exhibited superior catalytic activity with more than 70% conversion of CO2 and CH4 with an H2/CO ratio of 0.7 for a 50-h reaction at 700 °C. The prolonged reforming reaction also resulted in minimal coke deposition (11 μgc gcat –1 h–1), primarily due to the oxidative dissociation pathway of methane, as revealed through mechanistic analysis. Detailed surface studies highlighted the crucial role of…
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Taxonomy
TopicsCatalysts for Methane Reforming · Catalytic Processes in Materials Science · Chemical Looping and Thermochemical Processes