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View article: Facile Decarbonylation Suppresses the <i>Ortho</i> Effect and Ketene Formation in the Catalytic Pyrolysis of Substituted Benzaldehyde Lignin Model Compounds
Facile Decarbonylation Suppresses the <i>Ortho</i> Effect and Ketene Formation in the Catalytic Pyrolysis of Substituted Benzaldehyde Lignin Model Compounds Open
Ketene intermediates lead to branching and lower phenol selectivities in the catalytic pyrolysis of lignin model compounds, which makes understanding their formation mechanism key to enable targeted process optimization. While gas-phase py…
View article: The Impact of Binder Activity on Methanol-to-Hydrocarbons Conversion
The Impact of Binder Activity on Methanol-to-Hydrocarbons Conversion Open
View article: Pathways to Aromatics in the Catalytic Pyrolysis of a Polyvinylchloride Model Compound Revealed by Operando Photoelectron Photoion Coincidence Spectroscopy
Pathways to Aromatics in the Catalytic Pyrolysis of a Polyvinylchloride Model Compound Revealed by Operando Photoelectron Photoion Coincidence Spectroscopy Open
Dechlorination channels and pathways to olefins and aromatics in the catalytic pyrolysis of the polyvinylchloride (PVC) model compound 1,3‐dichlorobutane are revealed using operando photoelectron photoion coincidence (PEPICO) spectroscopy.…
View article: Catalytic pyrolysis mechanism of lignin moieties driven by aldehyde, hydroxyl, methoxy, and allyl functionalization: the role of reactive quinone methide and ketene intermediates
Catalytic pyrolysis mechanism of lignin moieties driven by aldehyde, hydroxyl, methoxy, and allyl functionalization: the role of reactive quinone methide and ketene intermediates Open
The complex catalytic pyrolysis mechanism of key lignin monomers demonstrates how functional groups dictate product pathways, revealing insights to enhance desired chemical yields and minimize catalyst deactivation.
View article: Photoion Mass-Selected Threshold Photoelectron Spectroscopy to Detect Reactive Intermediates in Catalysis: From Instrumentation and Examples to Peculiarities and a Database
Photoion Mass-Selected Threshold Photoelectron Spectroscopy to Detect Reactive Intermediates in Catalysis: From Instrumentation and Examples to Peculiarities and a Database Open
Photoion mass-selected threshold photoelectron spectroscopy (ms-TPES) is a synchrotron-based, universal, sensitive, and multiplexed detection tool applied in the areas of catalysis, combustion, and gas-phase reactions. Isomer-selective vib…
View article: Tuning the zeolite acidity enables selectivity control by suppressing ketene formation in lignin catalytic pyrolysis
Tuning the zeolite acidity enables selectivity control by suppressing ketene formation in lignin catalytic pyrolysis Open
View article: A direct liquid sampling interface for photoelectron photoion coincidence spectroscopy
A direct liquid sampling interface for photoelectron photoion coincidence spectroscopy Open
We introduce an effective and flexible high vacuum interface to probe the liquid phase with photoelectron photoion coincidence (liq-PEPICO) spectroscopy at the vacuum ultraviolet (VUV) beamline of the Swiss Light Source. The interface comp…
View article: Frontispiz: Ketenes in the Induction of the Methanol‐to‐Olefins Process
Frontispiz: Ketenes in the Induction of the Methanol‐to‐Olefins Process Open
Heterogene Katalyse. In ihrer Zuschrift (e202207777) nutzen Patrick Hemberger et al. PEPICO-Spektroskopie zur Identifizierung von Keten- und Methylketen-Intermediaten in der Methylacetat-Umwandlung über HZSM-5-Zeolith.
View article: Frontispiece: Ketenes in the Induction of the Methanol‐to‐Olefins Process
Frontispiece: Ketenes in the Induction of the Methanol‐to‐Olefins Process Open
Heterogeneous Catalysis. In their Communication (e202207777), Patrick Hemberger et al. employed PEPICO spectroscopy to identify ketene and methylketene intermediates in methyl acetate conversion over the HZSM-5 zeolite.
View article: Ketenes in the Induction of the Methanol‐to‐Olefins Process
Ketenes in the Induction of the Methanol‐to‐Olefins Process Open
Ketene (CH 2 =C=O) has been postulated as a key intermediate for the first olefin production in the zeolite‐catalyzed chemistry of methanol‐to‐olefins (MTO) and syngas‐to‐olefins (STO) processes. The reaction mechanism remains elusive, bec…
View article: Ketenes in the Induction of the Methanol‐to‐Olefins Process
Ketenes in the Induction of the Methanol‐to‐Olefins Process Open
Ketene (CH 2 =C=O) has been postulated as a key intermediate for the first olefin production in the zeolite‐catalyzed chemistry of methanol‐to‐olefins (MTO) and syngas‐to‐olefins (STO) processes. The reaction mechanism remains elusive, bec…
View article: Elucidation of radical- and oxygenate-driven paths in zeolite-catalysed conversion of methanol and methyl chloride to hydrocarbons
Elucidation of radical- and oxygenate-driven paths in zeolite-catalysed conversion of methanol and methyl chloride to hydrocarbons Open
View article: <i>Operando</i> PEPICO unveils the catalytic fast pyrolysis mechanism of the three methoxyphenol isomers
<i>Operando</i> PEPICO unveils the catalytic fast pyrolysis mechanism of the three methoxyphenol isomers Open
Demethylation, demethoxylation and fulvenone ketene formation determine the reactivity of methoxyphenols over H-ZSM-5 to yield phenols, benzene and toluene. Intermediates are isomer-selectively detected utilizing threshold photoelectron sp…
View article: On the absolute photoionization cross section and threshold photoelectron spectrum of two reactive ketenes in lignin valorization: fulvenone and 2-carbonyl cyclohexadienone
On the absolute photoionization cross section and threshold photoelectron spectrum of two reactive ketenes in lignin valorization: fulvenone and 2-carbonyl cyclohexadienone Open
The absolute photoionization cross section (PICS) of these crucial ketene intermediates supports their quantification in lignin pyrolysis, combustion and organic synthesis.
View article: Unimolecular thermal decarbonylation of vanillin stifled by the bimolecular reactivity of methyl-loss intermediate
Unimolecular thermal decarbonylation of vanillin stifled by the bimolecular reactivity of methyl-loss intermediate Open
We studied the thermal decomposition of vanillin in a low-pressure pyrolysis microreactor by photoelectron photoion coincidence spectroscopy. The pyrolysis products were identified isomer-selectively by photoion mass-selected threshold pho…
View article: Frontispiece: Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled
Frontispiece: Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled Open
Heterogeneous Catalysis In their Communication on page 24002, Jeroen A. van Bokhoven et al. investigate the mechanism of methane conversion under non-oxidative conditions over iron-modified silica and unveil the role of propargyl radicals.
View article: Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled
Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled Open
Radical‐mediated gas‐phase reactions play an important role in the conversion of methane under non‐oxidative conditions into olefins and aromatics over iron‐modified silica catalysts. Herein, we use operando photoelectron photoion coincide…
View article: Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled
Direct Evidence on the Mechanism of Methane Conversion under Non‐oxidative Conditions over Iron‐modified Silica: The Role of Propargyl Radicals Unveiled Open
Radical‐mediated gas‐phase reactions play an important role in the conversion of methane under non‐oxidative conditions into olefins and aromatics over iron‐modified silica catalysts. Herein, we use operando photoelectron photoion coincide…
View article: Isomer-dependent catalytic pyrolysis mechanism of the lignin model compounds catechol, resorcinol and hydroquinone
Isomer-dependent catalytic pyrolysis mechanism of the lignin model compounds catechol, resorcinol and hydroquinone Open
Detection of reactive intermediates with synchrotron radiation and photoelectron photoion coincidence methods reveals new mechanistic insights into lignin catalytic pyrolysis. Here we focus on how the isomerism changes the conversion and p…