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2 edition of Thermal effects in exothermic catalytic reactions. found in the catalog.

Thermal effects in exothermic catalytic reactions.

Ho-peng Koh

Thermal effects in exothermic catalytic reactions.

by Ho-peng Koh

  • 160 Want to read
  • 36 Currently reading

Published by University of Salford in Salford .
Written in English


Edition Notes

PhD thesis, Chemical Engineering.

SeriesND2799/72
ID Numbers
Open LibraryOL19687496M

Catalysis (/ k ə ˈ t æ l ə s ɪ s /) is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (/ ˈ k æ t əl ɪ s t /), which is not consumed in the catalyzed reaction and can continue to act e of this, only very small amounts of catalyst are required to alter the reaction rate in most cases. In general, chemical reactions. Investigation of catalytic activities by differential thermal analysis. Journal of Thermal Analysis , 46 (6), DOI: /BF B. Wayne Bequette. Operability analysis of an exothermic semi-batch reactor. Computers & Chemical Engineering , 20, SS DOI: /(96)Cited by:

Coupling of the exothermic catalytic oxidative conversion and endothermic thermal cracking (noncatalytic) reactions of propane to propylene and ethylene over the SrO/La{sub 2}O{sub 3}/SA catalyst in the presence of steam and limited oxygen was investigated at different process conditions (temperature, C; C{sub 3}H{sub 8}/O{sub 2} ratio in feed, . The Claus technology can be divided into two process steps, thermal and catalytic. Thermal step. In the thermal step, hydrogen sulfide-laden gas reacts in a substoichiometric combustion at temperatures above °C such that elemental .

are catalysts only used in exothermic reactions? --> no, catalysts simply decrease the activation energy of a reaction. They have no effect on the enthalpy of the reaction. An endothermic reaction with a catalyst will remain endothermic and an exothermic reaction will remain exothermic. In plasmon-enhanced heterogeneous catalysis, illumination accelerates reaction rates by generating hot carriers and hot surfaces in the constituent nanostructured metals. In order to understand how photogenerated carriers enhance the nonthermal reaction rate, the effects of photothermal heating and thermal gradients in the catalyst bed must be confidently and Cited by:


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Thermal effects in exothermic catalytic reactions by Ho-peng Koh Download PDF EPUB FB2

A two-dimensional, analytical local thermal non-equilibrium model of transport of heat and mass was developed for an asymmetric microreactor, accommodating an exothermic catalytic reaction.

The thermal diffusion of mass was taken into account and thus mass transfer was coupled to the thermal by: 6. Thermal effects in exothermic catalytic reactions. Author: Koh, H.-P. ISNI: Awarding Body: University of Salford Current Institution: University of Salford Date of Award: Availability of Full Text: Full text unavailable from EThOS.

The effects of exothermic and endothermic chemical reactions with Arrhenius activation energy on the velocity, temperature, and concentration are also studied in this paper. Concerning the heat effects, Subbotin et al., reported that hysteresis is typically observed in carbon monoxide oxidation, a very exothermic reaction.

They associate hysteresis to “spot-type” overheating of the active sites of the catalyst surface, as result of the production of excessive : A.

Biasin, J. Fabro, N. Michelon, A. Glisenti, P. Canu. The effects of exothermic and endothermic chemical reactions with Arrhenius activation energy on the velocity, temperature, and concentration are also studied in this paper.

The governing partial differential equations are reduced to ordinary differential equations by introducing locally similarity transformation (Maleque ()).Cited by: An important consideration in partial oxidations is the thermal and chemical coupling between the catalytic and homogeneous reactions.

We consider here only thermal coupling and comment on its impact on the bifurcations using the case of two simultaneous oxidations (A→B, A→C) where the first reaction is catalytic and second is by: 1.

Introduction. Energy dissipation at surfaces and interfaces is mediated by excitation of elementary processes, including phonons and electronic excitation, once external energy is deposited to the surface during exothermic chemical processes,.Electron excitation in exothermic catalytic reactions or the incidence of photons on metal surfaces results in the Cited by:   Highly exothermic catalytic reactions are problematic from a thermal management perspective and often dictate the type of reactor, heat exchanger, level of conversion/recycle and contacting scheme that are by: The catalytic reaction starts by bonding of the reactants A and B to the catalyst, in a spontaneous reaction.

Hence, the formation of this complex is exothermic, and the free energy is lowered. There then follows the reaction between A and B while they are bound to the catalyst.

This step is associated with an activation energy; how-File Size: KB. There have been many catalysts developed for the SCR reaction [9, 10], among which a V2O5/TiO2 catalyst has been widely used in commercial applications [10].

Although the equation () is an overall reaction for SCR, many elementary steps are involved during the reaction between NO and NH3 [11].File Size: KB. Enhanced Diffusion of Enzymes that Catalyze Exothermic Reactions.

exothermic catalytic reaction g enerates thermal suggests a possible effect of the heat of reaction on the structural Author: Ramin Golestanian. Coupling of the exothermic catalytic oxidative conversion and endothermic thermal cracking (noncatalytic) reactions of propane to propylene and ethylene over the SrO/La2O3/SA catalyst in the presence of steam and limited oxygen was investigated at different process conditions (temperature, − °C; C3H8/O2 ratio in feed, −; Cited by: The combustion of waste gases may be accomplished in a thermal oxidizer or in a catalytic oxidizer.

In the catalytic oxidizer, a catalyst is used to increase the rate of the combustion reaction, allowing the combustion to occur at lower temperatures. Because the catalytic process. The evaluation of converters for exothermic and endothermic catalytic reactions occurring within narrow temperature limits Paperback – January 1, by : Gustav.

Wirth. Exothermic Reaction Paperback – January 1, by Beth Houston (Author) › Visit Amazon's Beth Houston Page.

Find all the books, read about the author, and more. See search results for this author. Are you an author. Learn about Author Central Author: Beth Houston.

Many chemical reactions release energy in the form of heat, light, or sound. These are exothermic rmic reactions may occur spontaneously and result in higher randomness or entropy (ΔS > 0) of the system.

They are denoted by a negative heat flow (heat is lost to the surroundings) and decrease in enthalpy (ΔH. Request PDF | ‘High Conductivity’ Monolith Catalysts for Gas/Solid Exothermic Reactions | The replacement of conventional packed beds of catalyst pellets with novel ‘high conductivity.

Being of a self-accelerating effect, initiation temperature of oxidation would lower in isothermal experiment than in dynamic method. From the viewpoint of loss or disaster prevention, self-accelerating or auto-catalytic reaction that possesses exothermic behavior should have to be implemented by isothermal by: An exothermic reaction is a chemical reaction that releases energy through light or is the opposite of an endothermic reaction.

Expressed in a chemical equation: reactants → products + rmic Reaction means "exo" (derived from the greek word: "έξω", literally translated to "out") meaning releases and "thermic" means heat.

It is found that the transformation rate and the corresponding product are very different with and without the assistance of hot electron catalysis. The thermal effect plays a dominant role in plasmon-catalyzed material transformation, and hot electrons can promote the oxidation reaction by facilitating the generation of active : Chengyun Zhang, Ting Kong, Zhengkun Fu, Zhenglong Zhang, Hairong Zheng.

Reaction-advection flows in porous media in which the chemical reactions are exothermic and thermal effects are coupled to changes in fluid viscosity, density and surface tension have been.Undesired exothermic reactions initiated during production, purification or storage by excessive temperatures or other causes have similar destructive effects, even if the origin is different.

Although the hazards connected with exothermic reactions have been known since the inception of the chemical industry, a systematic knowledge of the.Two types of novel micro-structured reactors are presented which have been applied for two highly exothermic catalytic reactions, i.e., the oxidative dehydrogenation of propane (ODP) and .