Hydrocarbon Formation from Syngas with In-Operando Monitoring of Cobalt- and Manganese-Based (pre)Catalysts Using X-ray Diffraction
Ravneet K. Bhullar, Wenqian Xu, Michael J. Zdilla
TL;DR
This study explores how different metal oxides act as precatalysts in converting syngas into hydrocarbons, with a focus on cobalt and manganese-based materials.
Contribution
The paper introduces a novel in-operando X-ray diffraction method to monitor catalyst transformations during syngas conversion.
Findings
LiCoO2 precatalyst produced higher hydrocarbon conversions with low olefin-to-paraffin ratios.
Cobalt-doped birnessite showed lower conversions but a high olefin-to-paraffin ratio of over 20:1.
In situ XRD revealed phase changes in precatalysts during syngas reactions.
Abstract
Two-layered metal oxides (LiCoO2 and cobalt-doped KnMnO2, n < 1) were explored as precatalysts for nanoconfined cobalt-based Fischer–Tropsch catalysts for conversion of syngas (CO and H2) to hydrocarbons. Ex situ, in situ, and PDF XRD analyses are presented. Based on in situ XRD analysis, LiCoO2 underwent reduction to predominantly cubic and hexagonal phases of cobalt metal. Reaction with syngas resulted in the generation of carbon, cobalt carbide, and lithium carbonate, in addition to the metallic cobalt phases. In the case of cobalt-doped birnessite, catalyst activation converted the birnessite phase to manganite and the cobalt to elemental cobalt, along with similar lithium and carbon phases. Conversion of syngas to C1 through C7 products was observed. The best conversions were observed for the LiCoO2 precursor catalyst, with generally a low olefin-to-paraffin ratio. While the…
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Taxonomy
TopicsCatalysts for Methane Reforming · Catalytic Processes in Materials Science · Catalysis and Oxidation Reactions