Boudouard reaction


Boudouard reaction

The Boudouard reaction is the redox reaction of a chemical equilibrium mixture of carbon monoxide and carbon dioxide at a given temperature. It is the disproportionation of carbon monoxide into carbon dioxide and graphite or its reverse

::2CO ightleftharpoons CO2 + C

According to the Ellingham diagram, the formation enthalpy of CO2 by oxidation of carbon is constant and indifferent of the temperature, while the formation enthalpy of CO is a decreasing line. The Boudouard reaction implies that on lower temperatures the equilibrium is on the exothermic carbon dioxide side and on higher temperatures the endothermic formation of carbon monoxide is the dominant product, as predicted by the Le Chatelier's Principle.

For instance, in the high-temperature, reducing environment of a smokestack, carbon monoxide is the stable product. When the carbon monoxide reaches the top of the smokestack, and the cooler air, the Boudouard Reaction takes place, the carbon monoxide is oxidized into carbon dioxide, and the graphite precipitates (reduces) as soot. The Ellingham diagram defines the equilibrium formation enthalpy on function of temperature.

In industrial catalysis, this is not just an eyesore; the coking can cause irreversible damage to catalysts and catalyst beds. This reaction also takes place in blast furnaces where carbon monoxide is used as the reductive agent on purifying metallic iron from its oxides in ore.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Réaction de Boudouart — Haut fourneau Un haut fourneau est un four à combustion interne, destiné à la fabrication de la fonte à partir du minerai de fer. Cette fonte est par la suite affinée par chauffage (décarburation) ce qui permet de produire de l acier et des… …   Wikipédia en Français

  • Chemical reaction — Chemical reactions redirects here. For the 2007 television episode, see Chemical Reactions (Men in Trees). A thermite reaction using iron(III) oxide. The sparks …   Wikipedia

  • Equilibre de Boudouard — Équilibre de Boudouard L équilibre de Boudouard correspond à la réduction du dioxyde de carbone par le carbone solide en monoxyde de carbone gazeux: La variation d enthalpie standard de cette réaction à 298 K vaut ΔrH° = 172,3 kJ.mol 1 Cette… …   Wikipédia en Français

  • Équilibre de boudouard — L équilibre de Boudouard correspond à la réduction du dioxyde de carbone par le carbone solide en monoxyde de carbone gazeux: La variation d enthalpie standard de cette réaction à 298 K vaut ΔrH° = 172,3 kJ.mol 1 Cette réaction est endothermique …   Wikipédia en Français

  • Équilibre de Boudouard — L équilibre de Boudouard correspond à la réduction du dioxyde de carbone par le carbone solide en monoxyde de carbone gazeux: La variation d enthalpie standard de cette réaction à 298 K vaut ΔrH° = 172,3 kJ.mol 1 L enthalpie standard étant… …   Wikipédia en Français

  • Carbon monoxide — chembox Name = Carbon monoxide ImageFileL1 = Carbon monoxide 2D.svg ImageSizeL1 = 100px ImageNameL1 = Structure of the carbon monoxide molecule ImageFileR1 = Carbon monoxide 3D vdW.png ImageSizeR1 = 120px ImageNameR1 = Space filling model of the… …   Wikipedia

  • Chemical equilibrium — In a chemical reaction, chemical equilibrium is the state in which the concentrations of the reactants and products have not yet changed with time. It occurs only in reversible reactions, and not in irreversible reactions. Usually, this state… …   Wikipedia

  • Disproportionation — Disproportionation, also known as dismutation is used to describe a specific type of redox reaction in which a species is simultaneously reduced and oxidized so as to form two different products. For example: the UV photolysis of mercury(I)… …   Wikipedia

  • Blast furnace — A blast furnace is a type of metallurgical furnace used for smelting to produce metals, generally iron. In a blast furnace, fuel and ore are continuously supplied through the top of the furnace, while air (sometimes with oxygen enrichment) is… …   Wikipedia

  • Cornwall Iron Furnace — U.S. National Register of Historic Places U.S. National Historic Landmark …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.