Chemisorption
Chemisorption[edit | edit source]
Chemisorption is a type of adsorption that involves a chemical reaction between the surface and the adsorbate. This process results in a strong bond, often covalent, between the adsorbate and the surface. Chemisorption is typically characterized by its specificity, irreversibility, and the formation of a monolayer.
Mechanism[edit | edit source]
Chemisorption occurs when the adsorbate forms a chemical bond with the surface atoms of the substrate. This process can involve the sharing or transfer of electrons, leading to the formation of covalent or ionic bonds. The strength of these bonds is much greater than those involved in physisorption, which is governed by weaker van der Waals forces.
The process of chemisorption can be influenced by several factors, including the nature of the surface, the type of adsorbate, temperature, and pressure. Unlike physisorption, chemisorption is often an activated process, meaning it requires an initial input of energy to overcome an activation barrier.
Applications[edit | edit source]
Chemisorption plays a crucial role in various industrial and scientific applications. One of the most significant applications is in catalysis, where chemisorption is essential for the activation of reactants on the surface of a catalyst. For example, in the hydrogenation process, hydrogen molecules chemisorb onto the surface of a metal catalyst, facilitating the addition of hydrogen to unsaturated organic compounds.
Other applications include:
Characteristics[edit | edit source]
Chemisorption is characterized by the following features:
- Specificity: Chemisorption is highly specific to the type of adsorbate and the surface.
- Irreversibility: Due to the strong chemical bonds formed, chemisorption is often irreversible.
- Monolayer formation: Chemisorption typically results in the formation of a single layer of adsorbate on the surface.
- Activation energy: The process usually requires activation energy to proceed.
Related pages[edit | edit source]
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
|
WikiMD's Wellness Encyclopedia |
| Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates, categories Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD
