Hard X-ray-based techniques for structural investigations of CO₂ methanation catalysts prepared by MOF decomposition

Abstract

We investigate the structure-activity correlations of methanation catalysts obtained by thermal decomposition of a Ni-based metal-organic framework, using pair distribution function, X-ray absorption spectroscopy and X-ray diffraction.

Digitization in Catalysis Research: Towards a Holistic Description of a Ni/Al2O3 Reference Catalyst for CO2 Methanation

“…The observed shape of the activated species is quite comparable to those seen for decomposed MOF pre‐catalysts in previous work. For these pre‐catalysts, a mixture of Ni(0) and Ni(II) species are present on carbon support [31] …”

“…For these pre-catalysts, a mixture of Ni(0) and Ni(II) species are present on carbon support. [31] Further EXAFS analysis was performed to get information about structural parameters (see Table S4, ESI). Figure 6b shows the Fourier-transformed EXAFS spectra of the investigated samples.…”

Uncovering the Structure of Heterogeneous Catalysts Using Atomic Pair Distribution Function Analysis

“…The resulting PDF can been referred to as difference (or differential) PDF (d-PDF) [9]. This approach has been applied to a vast variety of supported catalysts [31,47,[52][53][54][55][56][57][58][59][60][61][62][63][64] . For example, d-PDF analysis allowed to characterize in detail the supported phases in gallium oxide-based catalysts for propane dehydrogenation (PDH) [31].…”

“…The well-defined, versatile hierarchical crystal structure of MOFs has been exploited to develop synthetic routes to produce supported nanoparticles of controlled sizes, phases and compositions [57,63,73]. In this context, MOFs have been proposed as precursors to produce well-dispersed metal centres supported onto carbon [57].…”

Festkörperchemie

“…Temperatur-und zeitabhängige Entwicklung des Einheitszellenvolumens von α-PbAlBO 4 , inklusive der Phasenumwandlung zu β-PbAlBO 4 . 36) Abb. 10. a) Logarithmische Auftragung des LIR der zwei thermisch gekoppelten Zustände gegen die reziproke Temperatur zur Bestimmung der Energielücke ∆E 21 im Fall eines Boltzmann-Gleichgewichts.…”