Themed collection In situ and operando spectroscopy in catalysis
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Operando X-ray absorption spectroscopic studies of the carbon dioxide reduction reaction in a modified flow cell
Operando XAS reveals that the copper catalysts undergo a remarkable reduction to the metallic state during CO2RR.
Catal. Sci. Technol., 2022,12, 2739-2743
https://doi.org/10.1039/D2CY00220E
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Operando monitoring of a room temperature nanocomposite methanol sensor
A cross-disciplinary approach is employed to study working nanocomposite room temperature methanol sensors via a combination of operando and in situ spectroscopy techniques, paralleled by resistance measurements.
Catal. Sci. Technol., 2023,13, 624-636
https://doi.org/10.1039/D2CY01395A
Aging of industrial Fe-zeolite based catalysts for nitrous oxide abatement in nitric acid production plants
Two commercial Fe-zeolite catalysts used for N2O abatement from nitric acid production plants are analysed before and after hydrothermal aging for their structure and activity towards N2O conversion in complex feed.
Catal. Sci. Technol., 2022,12, 7308-7321
https://doi.org/10.1039/D2CY01486F
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The structural evolution of Mo2C and Mo2C/SiO2 under dry reforming of methane conditions: morphology and support effects
In situ Mo K-edge X-ray absorption spectroscopy reveals different carburization pathways for unsupported and supported MoO3 yielding Mo2C and Mo2C/SiO2. Mo2C/SiO2 features higher resistance to oxidation under dry reforming of methane than Mo2C.
Catal. Sci. Technol., 2022,12, 5620-5628
https://doi.org/10.1039/D2CY00729K
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Mapping catalyst activation, turnover speciation and deactivation in Rh/PPh3-catalysed olefin hydroformylation
Quantitative 31P operando FlowNMR spectroscopy allows chartering the unknown territory of catalyst speciation under process conditions.
Catal. Sci. Technol., 2022,12, 5501-5516
https://doi.org/10.1039/D2CY00312K
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Mechanistic insights into the CO2 capture and reduction on K-promoted Cu/Al2O3 by spatiotemporal operando methodologies
Integrated CO2 capture and conversion processes bring the promise of drastic abatement of CO2 emission together with its valorisation to chemical building blocks such as CH4 and CO.
Catal. Sci. Technol., 2022,12, 5349-5359
https://doi.org/10.1039/D2CY00228K
Heterogeneous parahydrogen induced polarization on Rh-containing silicalite-1 zeolites: effect of the catalyst structure on signal enhancement
Parahydrogen-induced polarization (PHIP) on Rh-containing silicalite-1 catalysts is studied using both liquid-state and in situ magic angle spinning NMR techniques and the catalyst structure effect is revealed.
Catal. Sci. Technol., 2022,12, 4442-4449
https://doi.org/10.1039/D2CY00615D
Rhodium promoted heteropolyacid catalysts for low temperature methanol carbonylation
Rh(OAc)2/HPW/SiO2 is an effective bifunctional catalyst for the halide-free carbonylation of methanol to methyl acetate and acetic acid.
Catal. Sci. Technol., 2022,12, 3886-3897
https://doi.org/10.1039/D2CY00254J
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Prospects and challenges for autonomous catalyst discovery viewed from an experimental perspective
Autonomous catalysis research requires elaborate integration of operando experiments into automated workflows. Suitable experimental data for analysis by artificial intelligence can be measured more readily according to standard operating procedures.
Catal. Sci. Technol., 2022,12, 3650-3669
https://doi.org/10.1039/D2CY00275B
Anchored complexes of rhodium and iridium for the hydrogenation of alkynes and olefins with parahydrogen
Iridium and rhodium complexes anchored on silica gel surface via NH2–(CH2)3– and P(Ph)2–(CH2)2– linker groups achieve high (∼9%) efficiency in pairwise addition of parahydrogen to unsaturated gaseous substrates in heterogeneous hydrogenation processes.
Catal. Sci. Technol., 2022,12, 3247-3253
https://doi.org/10.1039/D1CY02258J
Electrolyte pH-dependent hydrogen binding energies and coverages on platinum, iridium, rhodium, and ruthenium surfaces
The weakened Hatop binding strength and increased Hatop coverage are universal phenomena on Pt, Ir, Rh, and Ru surfaces from acidic to alkaline media, which are important factors in the pH-dependent hydrogen reaction kinetics.
Catal. Sci. Technol., 2022,12, 3228-3233
https://doi.org/10.1039/D2CY00385F
Tracking the in situ generation of hetero-metal–metal bonds in phosphide electrocatalysts for electrocatalytic hydrogen evolution
The in situ EXAFS experiments indicated that the Co–Ru moiety suppresses the formation of metallic Co under acidic conditions and dominates the catalytic activity of Rux@CoP electrocatalysts.
Catal. Sci. Technol., 2022,12, 3234-3239
https://doi.org/10.1039/D2CY00459C
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Catalyst sites and active species in the early stages of MTO conversion over cobalt AlPO-18 followed by IR spectroscopy
Reaction-time resolved IR spectroscopy highlights the role of CO and surface –OCH3 in the MTO conversion catalysed by CoAPO-18 with maximised concentration of acidic sites.
Catal. Sci. Technol., 2022,12, 2775-2792
https://doi.org/10.1039/D2CY00303A
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Partial reduction of NO to N2O on Cu{311}: role of intermediate N2O2
Reflection absorption infrared spectroscopy (RAIRS) and first-principles density functional theory (DFT) combine to suggest a pathway for NOx reduction on Cu{311} involving a flat-lying N2O2 intermediate.
Catal. Sci. Technol., 2022,12, 2793-2803
https://doi.org/10.1039/D1CY02284A
Deactivation and regeneration of a benchmark Pt/C catalyst toward oxygen reduction reaction in the presence of poisonous SO2 and NO
Adsorbed SO2 on Pt sites can be substituted by NO; adsorbed NO can be completely reduced to NH4+ and removed in a reduction potential range.
Catal. Sci. Technol., 2022,12, 2929-2934
https://doi.org/10.1039/D2CY00141A
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Tracking heterogeneous structural motifs and the redox behaviour of copper–zinc nanocatalysts for the electrocatalytic CO2 reduction using operando time resolved spectroscopy and machine learning
Elucidating the role of Zn in bimetallic CuZn nanocatalysts for the electrocatalytic CO2 reduction reaction (CO2RR), where the greenhouse gas CO2 is converted into valuable industrial chemicals using energy from renewable sources.
Catal. Sci. Technol., 2022,12, 3028-3043
https://doi.org/10.1039/D2CY00227B
In situ mass analysis of surface reactions using surface-enhanced Raman spectroscopy covering a wide range of frequencies
Both the structural change and mass change of adsorbates in heterogeneous surface reactions were simultaneously measured in situ using frequency-extended SERS spectroscopy.
Catal. Sci. Technol., 2022,12, 2670-2676
https://doi.org/10.1039/D2CY00229A
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New insights into the NH3-selective catalytic reduction of NO over Cu-ZSM-5 as revealed by operando spectroscopy
To control diesel vehicle NOx emissions, Cu-exchanged zeolites have been applied in the selective catalytic reduction of NO using NH3 as reductant. In this work, the local structure of Cu2+ in zeolite ZSM-5 has been revealed by operando spectroscopies.
Catal. Sci. Technol., 2022,12, 2589-2603
https://doi.org/10.1039/D1CY02348A
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Carbene-like reactivity of methoxy groups in a single crystal SAPO-34 MTO catalyst
In situ synchrotron infrared microspectroscopy on single crystals of SAPO-34 reveals that a carbene insertion mechanism is responsible for the first carbon–carbon bond formation from surface methoxy groups.
Catal. Sci. Technol., 2022,12, 2289-2305
https://doi.org/10.1039/D1CY02361F
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Gas phase vs. liquid phase: monitoring H2 and CO adsorption phenomena on Pt/Al2O3 by IR spectroscopy
The adsorption of H2 and CO over Pt/Al2O3 was studied in gas and in liquid phase by FT-IR and ATR-IR spectroscopies under otherwise similar conditions. The solvent competes with hydrogen and CO for terrace and kink metal sites.
Catal. Sci. Technol., 2022,12, 1359-1367
https://doi.org/10.1039/D1CY02233D
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Nano-scale insights regarding coke formation in zeolite SSZ-13 subject to the methanol-to-hydrocarbons reaction
A correlation between the micro- and nano-scale coking behavior of SSZ-13 was discovered with in situ/operando spectroscopy and atom probe tomography (APT), which allows for spatial reconstruction and analysis of relations between framework elements and carbon atoms.
Catal. Sci. Technol., 2022,12, 1220-1228
https://doi.org/10.1039/D1CY01938D
In situ FTIR spectroscopy to unravel the bifunctional nature of aromatics hydrogenation synergy on zeolite/metal catalysts
The hydrogenation of pyridine adsorbed on zeolite is dependent on the distance between acid and metal sites. Hydrogen species produced in the metal diffuse into pyridine and promote hydrogenation, suggesting a bifunctional mechanism is occurring.
Catal. Sci. Technol., 2022,12, 1117-1129
https://doi.org/10.1039/D1CY01724A
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Structural insight into an atomic layer deposition (ALD) grown Al2O3 layer on Ni/SiO2: impact on catalytic activity and stability in dry reforming of methane
Improving the stability of Ni-based dry reforming catalysts is a key challenge. ALD-grown Al2O3 overcoats deposited onto Ni/SiO2 prevent the sintering of Ni, reduce deactivation by coke and inhibit the formation of inactive NiAl2O4 on time on stream.
Catal. Sci. Technol., 2021,11, 7563-7577
https://doi.org/10.1039/D1CY01149A
Determining intrinsic stark tuning rates of adsorbed CO on copper surfaces
This work reports a general and effective strategy of determining the intrinsic Stark tuning rate by removing the impact of the dynamical coupling of adsorbed CO on the Cu surface with surface enhanced infrared absorption spectroscopy (SEIRAS).
Catal. Sci. Technol., 2021,11, 6825-6831
https://doi.org/10.1039/D1CY01090E
Framework coordination of single-ion Cu2+ sites in hydrated 17O-ZSM-5 zeolite
The interfacial coordination chemistry of water solvated single Cu2+ sites in ZSM-5 is assessed through pulsed EPR spectroscopy and selective 17O isotopic labelling.
Catal. Sci. Technol., 2021,11, 5191-5199
https://doi.org/10.1039/D1CY00838B
About this collection
This Catalysis Science & Technology themed collection, guest edited by Professor Angelika Brueckner (Leibniz-Institut für Katalyse, Germany), Professor Jian-Feng Li (Xiamen University, China) and Catalysis Science & Technology Associate Editor Professor Bin Liu (Nanyang Technological University, Singapore), showcases cutting-edge advances in the areas of in situ and operando spectroscopy. The research works featured in this collection will cover the broad spectrum of catalytic science research, including homogeneous and heterogeneous catalytic systems, as well as a variety of spectroscopic techniques and methodologies.