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Catalysis and Reaction Engineering Commons™
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Articles 1 - 10 of 10
Full-Text Articles in Catalysis and Reaction Engineering
Functional Carbons And Carbon Nanohybrids For The Catalytic Conversion Of Biomass To Renewable Chemicals In The Condensed Phase, John Matthiesen, Thomas Hoff, Chi Liu, Charles Pueschel, Radhika Rao, Jean-Philippe Tessonnier
Functional Carbons And Carbon Nanohybrids For The Catalytic Conversion Of Biomass To Renewable Chemicals In The Condensed Phase, John Matthiesen, Thomas Hoff, Chi Liu, Charles Pueschel, Radhika Rao, Jean-Philippe Tessonnier
Jean-Philippe Tessonnier
The production of chemicals from lignocellulosic biomass provides opportunities to synthesize chemicals with new functionalities and grow a more sustainable chemical industry. However, new challenges emerge as research transitions from petrochemistry to biorenewable chemistry. Compared to petrochemisty, the selective conversion of biomass-derived carbohydrates requires most catalytic reactions to take place at low temperatures (< 300 °C) and in the condensed phase to prevent reactants and products from degrading. The stability of heterogeneous catalysts in liquid water above the normal boiling point represents one of the major challenges to overcome. Herein, we review some of the latest advances in the field with an emphasis on the role of carbon materials and carbon nanohybrids in addressing this challenge.
Chemically Modified Multi-Walled Carbon Nanotubes (Mwcnts) With Anchored Acidic Groups, Nuruzatulifah Bt Asari Mansor, Jean-Philippe Tessonnier, Ali Rinaldi, Sylvia Reiche, M. G. Kutty
Chemically Modified Multi-Walled Carbon Nanotubes (Mwcnts) With Anchored Acidic Groups, Nuruzatulifah Bt Asari Mansor, Jean-Philippe Tessonnier, Ali Rinaldi, Sylvia Reiche, M. G. Kutty
Jean-Philippe Tessonnier
Surface functionalization of multi-walled carbon nanotubes (MWCNTs) was carried out using a gas phase treatment in a Universal Temperature Program (UTP) reactor by flowing SO 3 gas onto the CNTs while being heated at different temperatures. The functionalized nanotubes were characterized using X-ray Fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FT-IR) and Raman spectroscopy. The amount of oxyen and sulfur containing groups was determined by acid-base titration. The titration results were in good agreement with elemental analysis using X-ray fluorescence. FTIR analysis showed the presence of oxygen and sulfur containing groups, S=O, C-S, C=O and-COOH. Raman spectroscopy confirmed that oxygen and …
Electronic And Magnetic Structure Of (Crcl 3 ) 3, M. Grodzicki, B. Mallick, Anja V. Mudring
Electronic And Magnetic Structure Of (Crcl 3 ) 3, M. Grodzicki, B. Mallick, Anja V. Mudring
Anja V. Mudring
Electronic structure calculations in the local spin-density approximation have been carried out on the recently synthesized trimer (CrCl 3 ) 3 exhibiting antiferromagnetic ordering below T N =55 K. The calculated magnetic coupling constant, the paramagnetic Curie temperature, and the decrease of the magnetic moment below T N are well reproduced by the calculations. An interpretation of the spin structure is given that is consistent with all experimental data currently available.
Amino-Functionalized Carbon Nanotubes As Solid Basic Catalysts For The Transesterification Of Triglycerides, Alberto Villa, Jean-Philippe Tessonnier, Olivier Majoulet, Dang Shen Su, Robert Schlogl
Amino-Functionalized Carbon Nanotubes As Solid Basic Catalysts For The Transesterification Of Triglycerides, Alberto Villa, Jean-Philippe Tessonnier, Olivier Majoulet, Dang Shen Su, Robert Schlogl
Jean-Philippe Tessonnier
Multiwalled carbon nanotubes grafted with various amino groups show high activity and stability when used as basic catalysts for the transesterification of triglycerides.
Design Of Mfi Zeolite-Based Composites With Hierarchical Pore Structure: A New Generation Of Structured Catalysts, F. Ocampo, H. S. Yun, M. Maciel Pereira, Jean-Philippe Tessonnier, B. Louis
Design Of Mfi Zeolite-Based Composites With Hierarchical Pore Structure: A New Generation Of Structured Catalysts, F. Ocampo, H. S. Yun, M. Maciel Pereira, Jean-Philippe Tessonnier, B. Louis
Jean-Philippe Tessonnier
Zeolite/glass composite materials with hierarchical trimodal pore size distributions have been successfully prepared and subsequently characterized. Starting from glass monoliths having meso- and macropores, additional microporosity was introduced while allowing the growth of zeolite crystals via partial recrystallization of the glass support into ZSM-5 zeolite phase. Structured zeolitic catalytic materials were produced using a combination of supramolecular templating methods to produce the glass support, followed by conventional self-assembly of template cations and silica species. Zeolite crystals are therefore in intimate contact with the glass support, featuring micropores in addition to the mesopores. Hence, these zeolite/glass composites exhibit enhanced diffusional properties …
Beta Zeolite Supported On Silicon Carbide For Friedel–Crafts Fixed-Bed Reactions, Gauthier Wine, Joseph Matta, Jean-Philippe Tessonnier, Cuong Pham-Huu, Marc-Jacques Ledoux
Beta Zeolite Supported On Silicon Carbide For Friedel–Crafts Fixed-Bed Reactions, Gauthier Wine, Joseph Matta, Jean-Philippe Tessonnier, Cuong Pham-Huu, Marc-Jacques Ledoux
Jean-Philippe Tessonnier
Beta zeolite supported on silicon carbide, with high thermal conductivity and high mechanical strength, was successfully used as an active and stable catalyst for Friedel-Crafts reactions in a fixed bed configuration.
The Bmc/Giem Model For Micromixing In Non-Premixed Turbulent Reacting Flows, Rodney O. Fox, Kuochen Tsai
The Bmc/Giem Model For Micromixing In Non-Premixed Turbulent Reacting Flows, Rodney O. Fox, Kuochen Tsai
Rodney O. Fox
A novel beta mapping closure (BMC)/generalized IEM (GIEM) model is proposed to close the micromixing term in the joint composition probability density function (PDF) transport equation for nonpremixed, multiscalar turbulent reacting flows. Because the beta PDF gives an excellent description of binary inert scalar mixing, it is used to approximate the mixture fraction PDF. The proposed model thus effectively extends presumed PDF methods to handle finite-rate chemistry without introducing ad hoc assumptions about the form of the joint composition PDF. The BMC/GIEM model can be solved efficiently using a particle-based Monte-Carlo code. The model is first compared with the amplitude …
Oscillatory Dynamics In A Heterogeneous Surface Reaction: Breakdown Of The Mean-Field Approximation, R. Dennis Vigil, Frank T. Willmore
Oscillatory Dynamics In A Heterogeneous Surface Reaction: Breakdown Of The Mean-Field Approximation, R. Dennis Vigil, Frank T. Willmore
R. Dennis Vigil
Hierarchical mean-field rate equations and lattice-gas simulations were developed to elucidate the effects of the breakdown of the mean-field approximation for a model heterogeneous chemical oscillator that represents a simple extension of the well-known monomer-dimer surface reaction model. The bifurcation structure of the reaction kinetics depends sensitively on the details of surface transport processes, and the oscillatory behavior exhibited by the site approximation rate equations is not generally robust with respect to spatial correlations.
On The Liquid Flow Distribution In Trickle-Bed Reactors, Rodney O. Fox
On The Liquid Flow Distribution In Trickle-Bed Reactors, Rodney O. Fox
Rodney O. Fox
The previous analytical expression for the liquid flow distribution in trickle beds found by maximizing the so-called configurational entropy is reviewed, and a novel derivation is offered, more closely modeling data found in the literature. The novel distribution is an analytical expression describing the liquid flow distribution recently found by employing a Monte Carlo simulation of the very large lattice model (VLLM), thus reducing this computationally time-consuming procedure to a simple equation. The resultant distribution is a function of the total flow rate through the trickle bed, the bed permeability as expressed by the number of open channels through the …
The Electronic Properties Of Ar And Xe Under Pressure, Richard Alan Lesar
The Electronic Properties Of Ar And Xe Under Pressure, Richard Alan Lesar
Richard Alan Lesar
A simple model for calculating ground- and excited-state properties of molecular and rare-gas crystals is presented. The electrons are considered to be tightly bound to their molecular or atomic sites and the effects of the crystal potential, calculated with local-density funcationals, are treated as a perturbation of the molecules or atoms. Results for Ar to 500 kbar show that the ground-state atoms compress as the pressure is increased and that there is a gradual increase in excition energies. Preliminary results on ground-state Xe to 1.5 Mbar show that, to about 1 Mbar, the electronic distributions of the Xe atoms compress, …