2 edition of Positron emission profiling study of hydrocarbon conversion on zeolites found in the catalog.
Positron emission profiling study of hydrocarbon conversion on zeolites
N. J. Noordhoek
|The Physical Object|
|Number of Pages||155|
High pressure flow reactor for in situ X-ray absorption spectroscopy of catalysts in gas-liquid mixtures—A case study on gas and liquid phase activation of a Co-Mo/Al2O3 hydrodesulfurization catalyst. USA US07/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords oxide process zeolite boron mixtures Prior art date Legal status (The legal status is an assumption and is not a legal by:
American Journal of Materials Science , 7(5): DOI: /als A Review of the Chemistry, Structure, Properties andCited by: 9. High-silica AEI zeolites with Si/Al ratios of 13–20 were synthesized by FAU interzeolite conversion, in which tetraethylphosphonium (TEP) cations as a structure-directing agent (SDA) and NaF or NH 4 F as a fluoride source were added to the starting gels. During the thermal treatment of the AEI zeolites, TEP cations in the zeolitic pores decomposed to yield the P-modified AEI zeolites with.
The synthesis, characterization and catalytic performance of offretite with four distinct crystal morphologies (oval, hexagonal, broccoli-like, and spherical) are presented. As a member of the ABC-6 family of zeolite structures, offretite is likely to form intergrowths which can affect its shape-selective pr Catalytic reactivity of surfaces: in recognition of Franois GaultCited by: 3. Development of Highly Durable Zeolites as Hydrocarbon Trap Materials for Automotive Catalysts Low-temperature activity is an important requirement for automotive catalysts. In particular, most of the tailpipe emissions occur right after the engine starts (cold emissions).Cited by: 1.
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In their molecule-sized micropores, hydrocarbon diffusion plays a pivotal role in the final catalytic performance. Here, we present the results of Positron Emission Profiling experiments with labeled hydrocarbons in zeolites with the MFI by: 3.
Positron emission profiling: a study of hydrocarbon diffusivity in MFI zeolites: Published in: Zeolites are of prime importance to the petrochemical industry as catalysts for hydrocarbon conversion. In their molecule-sized micropores, hydrocarbon diffusion plays a pivotal role in the final catalytic performance.
This shows that Cited by: 3. Tracer-exchange experiments with positron emission profiling: Diffusion in zeolites Article in Microporous and Mesoporous Materials April with 21 Reads How we measure 'reads'.
Positron Emission Profiling (PEP) has been used for in-situ measurement of the surface coverage of H-mordenite by n-hexane, as a function of hexane partial pressure, at the elevated temperatures typically used for hydroisomerization by monitoring the retention Cited by: 3.
Catalysis Letters 56 () – Imaging of hydrocarbon reactions in zeolite packed-bed reactors using positron emission proﬁling B.G. Andersona, N.J. Noordhoekb,ngb, F.J.M.M. de Gauwa,b, M.J.A. de Voigtb and R.A. van Santena a Laboratory of Catalysis, Faculty of Chemical Engineering and Chemistry, Schuit Institute of Catalysis, Eindhoven University of Technology,Cited by: 6.
The positron emission tomography (PET) technique is a well-known method in nuclear medicine for molecular imaging of biochemical functions in the human body, but it can also be applied to.
Noordhoek has written: 'Positron emission profiling study of hydrocarbon conversion on zeolites' Asked in Authors, Poets, and Playwrights What has the author I N Uzoagba written.
Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents. Zeolites are widely used in industry for water purification, as catalysts, for the preparation of. Application of positron annihilation spectroscopy to the study of zeolites Z. Gao, X. Yan, and J.
Cui Department of C R em&y, Fudan University, Shanghai, People Republic of China Y. Wang Department of Physics, Fudan University, Shanghai, PeopleS Republic of China Positron annihilation lifetime measurements were carried out for various types of by: 6.
Hydrocarbon Conversion over Brønsted and Lewis Acidic Zeolites PROEFSCHRIFT ter verkrijging van de graad van doctor aan de Technische Universiteit Eindhoven, op gezag van de Rector Magnificus, C.J. van Duijn, voor een commissie aangewezen door het College voor Promoties in het openbaar te verdedigenCited by: 1.
The conversion of carbon dioxide to long-chain hydrocarbons is potentially crucial to the production of renewable fuels.
Now, two separate research groups in China have developed multifunctional catalysts that can convert CO 2 and hydrogen to gasoline, which comprises hydrocarbons with chain lengths between five and 11 carbon atoms. Various processes can convert CO 2 to hydrocarbons, but they. The complete oxidation of hydrocarbons with various structures (methane, n and wo-pentanes, cyclohexane, and benzene) on copper-modified ZSM-5 zeolite and the aromatization of propane on H-ZSM-5, are studied to analyze diffusion effects on the reaction kinetics.
Comparison of the kinetic parameters of complete oxidation shows that the process rate and the rate law strongly depend Author: M. Botavina, N. Nekrasov, S.
Kiperman.  B. Wang, G. Manos, A Novel TPD Method for Study of Acid Sites in USHY Zeolite during Hydrocarbon Conversion (in preparing)  B. Wang, J. Yu, G.
Manos, Role of Zeolitic Strong Acid Sites on Hydrocarbon Reactions (in preparing) Fig. Coke precursors and hard coke of a coked sample during thermogravimetric anaylsis.
Fig. A DFT study on benzene adsorption over a corner site of tungsten sulfides Catalysis Today. DOI: / 1: Hensen EJM, de Jong AM, van Santen RA. Positron emission profiling: A study of hydrocarbon diffusivity in MFI zeolites Molecular Sieves - Science and Technology.
7: This review article describes the structure of zeolites starting from atomic level to the complex networks of channels and voids that permeate the material.
The chemistry within the material is outlined relating it to its crystal structure. The resulting properties are described relating them to the crystal structure and the chemistry.
Finally, the applications of the material are summarised Cited by: 9. using Positron Emission Introduction Positron Emission and Positron-Electron Annihilation Detection Methods Based on Positron Emission Positron Emission Tomography (PET), Particle Tracking (PEPT) and Profiling (PEP) PEP Detectors and the Synthesis of Labeled Molecules Containing Positron-Emitting.
The deactivation by coke formation is studied over the medium and large pore zeolites H-ZSM, H-ZSM-5, H-Beta (two) and H-mordenite at a reaction temperature of °C and WHSV = h Gradually deactivated zeolites have been investigated with gas adsorption measurements, thermogravimetry and coke analysis by dissolution and extraction Author: Kjetil Gurholt Evensen.
Zeolites such as ZSM-5, that have been combined with a Group VIII metal have been used in the past as catalysts for hydrocarbon conversion. For example, U.S. Pat. 3, discloses a zeolite preferably containing a binder such as aluminia that has been loaded with platinum by impregnation or ion exchange.
1 1 Zeolites as Catalysts in Refining CHM project Barbara Brown 2 Crude Oil Refining • Crude oil in and of itself is of little use and market value • An oil refinery separates crude oil into various fractions based on differences in boiling point.
This process takes place in a distillation. Much of the pioneering work on zeolites, particularly the synthesis of new zeolites comes from the former Union Carbide and Mobil companies. Probably one of the most important paradigms is the launch of using quaternary ammonium hydroxides in the synthesis of zeolites .
This led to the discovery of zeolite ZSM-5 in by former Mobil .File Size: KB. In view of the substantial progress made in the last decade in the fields of zeolites and related materials it was decided to go for an extended 2nd Edition of "Introduction to Zeolite Science and Practice".Unfortunately - as often is the case - this process took more time than expected by the Editors.
Fluid catalytic cracking (FCC) is one of the major conversion technologies in the oil refinery industry. FCC currently produces the majority of the world's gasoline, as well as an important fraction of propylene for the polymer industry.
In this critical review, we give an overview of the latest trends in this field of by: Mind the breakage: The conversion of CO and H 2 to CH 4 over Ni catalysts suffers from particle growth through [Ni(CO) 4]‐mediated Ostwald varying the size and distance of the Ni particles, the size was found to be key: Small 3–4 nm particles grow to large inactive particles, breaking the pore structure of the silica support, while medium 8–9 nm particles remain confined by.