Robert Pestman
YOU?
Author Swipe
View article: Removal of carbon deposits on χ-Fe5C2 Fischer–Tropsch catalysts
Removal of carbon deposits on χ-Fe5C2 Fischer–Tropsch catalysts Open
The removal of carbon deposits from carburized Fe-based Fischer–Tropsch catalysts is a critical aspect of their performance. In this study, a method is presented to remove carbon deposits from freshly prepared χ-Fe5C2. The method involves …
View article: Pressure dependence and mechanism of Mn promotion of silica-supported Co catalyst in the Fischer-Tropsch reaction
Pressure dependence and mechanism of Mn promotion of silica-supported Co catalyst in the Fischer-Tropsch reaction Open
The mechanism of Mn promotion of a silica-supported Co catalyst in the Fischer-Tropsch reaction has been studied at varying pressures up to 20 bar. IR spectroscopy in combination with DFT calculations suggest adsorbed CO is activated by re…
View article: Influence of carbon deposits on Fe-carbide for the Fischer-Tropsch reaction
Influence of carbon deposits on Fe-carbide for the Fischer-Tropsch reaction Open
A well-known observation in the Fe-catalyzed Fischer-Tropsch (FT) reaction is that Fe-carbide catalysts deactivate due to carbon deposition. In comparison, the influence of such carbon deposits on the product distribution has been less wid…
View article: Isotopic Exchange Study on the Kinetics of Fe Carburization and the Mechanism of the Fischer–Tropsch Reaction
Isotopic Exchange Study on the Kinetics of Fe Carburization and the Mechanism of the Fischer–Tropsch Reaction Open
The kinetics of the transformation of metallic Fe to the active Fe carbide phase at the start of the Fischer-Tropsch (FT) reaction were studied. The diffusion rates of C atoms going in or out of the lattice were determined using 13C-labele…
View article: The role of H2 in Fe carburization by CO in Fischer-Tropsch catalysts
The role of H2 in Fe carburization by CO in Fischer-Tropsch catalysts Open
The formation of Fe-carbide phases is relevant to the synthesis of Fischer-Tropsch synthesis catalysts. We investigated the carburization of Raney Fe as a model catalyst using spectroscopic and temperature-programmed techniques. IR spectro…
View article: Furfural hydrodeoxygenation (HDO) over silica-supported metal phosphides – The influence of metal–phosphorus stoichiometry on catalytic properties
Furfural hydrodeoxygenation (HDO) over silica-supported metal phosphides – The influence of metal–phosphorus stoichiometry on catalytic properties Open
The gas-phase hydrodeoxygenation (HDO) of furfural, a model compound for bio-based conversion, was investigated over transition metal phosphide catalysts. The HDO activity decreases in the order Ni 2P ≈ MoP > Co 2P ≈ WP ≫ Cu 3P > Fe 2P. Ni…
View article: Mechanistic aspects of n-paraffins hydrocracking: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts
Mechanistic aspects of n-paraffins hydrocracking: Influence of zeolite morphology and acidity of Pd(Pt)/ZSM-5 catalysts Open
The influence of zeolite domain size, acidity, and metal type on n-decane and n-nonadecane hydroconversion was investigated for bifunctional Pd(Pt)/ZSM-5 zeolite (bulk, desilicated, thin and thick nanosheets). Decreasing the size of zeolit…
View article: Insight into the Rate-Determining Step and Active Sites in the Fischer–Tropsch Reaction over Cobalt Catalysts
Insight into the Rate-Determining Step and Active Sites in the Fischer–Tropsch Reaction over Cobalt Catalysts Open
Most studies on the Fischer-Tropsch reaction assume that the dissociation of the C-O bond is crucial in determining the overall reaction rate. However, recent experimental results show that a hydrogenation step is crucial in the overall ki…
View article: Synthesis of stable and low-CO <sub>2</sub> selective ε-iron carbide Fischer-Tropsch catalysts
Synthesis of stable and low-CO <sub>2</sub> selective ε-iron carbide Fischer-Tropsch catalysts Open
Phase-pure ε-iron carbide catalysts amenable to scale-up exhibit low CO 2 selectivity and high stability in the FT reaction.
View article: A dual-templating synthesis strategy to hierarchical ZSM-5 zeolites as efficient catalysts for the methanol-to-hydrocarbons reaction
A dual-templating synthesis strategy to hierarchical ZSM-5 zeolites as efficient catalysts for the methanol-to-hydrocarbons reaction Open
A novel dual-templating synthesis strategy is presented to obtain hierarchical ZSM-5 zeolite using a combination of known structure-directing agents for ZSM-5 synthesis and C16H33-[N+-methylpiperidine] (C16MP) as mesoporogen. C16MP is a ch…
View article: Front Cover: Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst (ChemCatChem 1/2018)
Front Cover: Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst (ChemCatChem 1/2018) Open
Graphical Abstract The Front Cover refers to the complex mechanism underlying the dissociation of CO on a cobalt nanoparticle, a reaction pivotal to Fischer-Tropsch synthesis. In their Communication, W. Chen et al. probed the direct CO dis…
View article: Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst
Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst Open
The front cover artwork for issue 1/2018 is provided by the Laboratory of Inorganic Materials Chemistry at Eindhoven University of Technology in The Netherlands. The image refers to the complex mechanism underlying the dissociation of CO o…
View article: Influence of Carbon Deposits on the Cobalt-Catalyzed Fischer–Tropsch Reaction: Evidence of a Two-Site Reaction Model
Influence of Carbon Deposits on the Cobalt-Catalyzed Fischer–Tropsch Reaction: Evidence of a Two-Site Reaction Model Open
One of the well-known observations in the Fischer-Tropsch (FT) reaction is that the CH4 selectivity for cobalt catalysts is always higher than the value expected on the basis of the Anderson-Schulz-Flory (ASF) distribution. Depositing grap…
View article: Mechanism of Cobalt-Catalyzed CO Hydrogenation: 1. Methanation
Mechanism of Cobalt-Catalyzed CO Hydrogenation: 1. Methanation Open
The mechanism of CO hydrogenation to CH4 at 260 °C on a cobalt catalyst is investigated using steady-state isotopic transient kinetic analysis (SSITKA) and backward and forward chemical transient kinetic analysis (CTKA). The dependence of …
View article: Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer–Tropsch Synthesis
Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer–Tropsch Synthesis Open
Fischer-Tropsch (FT) synthesis is one of the most complex catalyzed chemical reactions in which the chain-growth mechanism that leads to formation of long-chain hydrocarbons is not well understood yet. The present work provides deeper insi…
View article: Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst
Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer–Tropsch Catalyst Open
The way in which the triple bond in CO dissociates, a key reaction step in the Fischer–Tropsch (FT) reaction, is a subject of intense debate. Direct CO dissociation on a Co catalyst was probed by 12 C 16 O/ 13 C 18 O scrambling in the abse…
View article: On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al<sup>3+</sup><sub>,</sub> Ga<sup>3+</sup>, Fe<sup>3+</sup>, B<sup>3+</sup>) Zeolites in the Methanol‐to‐Hydrocarbons Reaction
On the Role of Acidity in Bulk and Nanosheet [T]MFI (T=Al<sup>3+</sup><sub>,</sub> Ga<sup>3+</sup>, Fe<sup>3+</sup>, B<sup>3+</sup>) Zeolites in the Methanol‐to‐Hydrocarbons Reaction Open
The influence of framework substituents (Al 3+ , Ga 3+ , Fe 3+ and B 3+ ) and morphology (bulk vs. nanometer‐sized sheets) of MFI zeolites on the acidity and catalytic performance in the methanol‐to‐hydrocarbons (MTH) reaction was investig…
View article: Direct synthesis of hierarchical ZSM-5 zeolite using cetyltrimethylammonium as structure directing agent for methanol-to-hydrocarbons conversion
Direct synthesis of hierarchical ZSM-5 zeolite using cetyltrimethylammonium as structure directing agent for methanol-to-hydrocarbons conversion Open
KOH and RbOH are suitable bases to crystallize hierarchical ZSM-5 in one step using cetyltrimethylammonium as the only structure-directing agent.
View article: Kinetic aspects of chain growth in Fischer–Tropsch synthesis
Kinetic aspects of chain growth in Fischer–Tropsch synthesis Open
Microkinetics simulations are used to investigate the elementary reaction steps that control chain growth in the Fischer–Tropsch reaction. Chain growth in the FT reaction on stepped Ru surfaces proceeds via coupling of CH and CR surface in…