chemisorption

chem·i·sorb

(kĕm′ĭ-sôrb′) also chem·o·sorb (-ə-sôrb′)tr.v. chem·i·sorbed, chem·i·sorb·ing, chem·i·sorbs also chem·o·sorbed or chem·o·sorb·ing or chem·o·sorbs To take up and chemically bind (a substance) onto the surface of another substance.

[Alteration of chemo- + (ab)sorb.]

chem′i·sorp′tion (-sôrp′shən) n.

chemisorption

(ˌkɛmɪˈsɔːpʃən) n (Chemistry) an adsorption process in which an adsorbate is held on the surface of an adsorbent by chemical bonds

chem•i•sorp•tion

(ˌkɛm əˈsɔrp ʃən, -ˈzɔrp-)

n. adsorption involving a chemical linkage between the adsorbent and the adsorbate. [1930–35; chemi- + (ad) sorption]

Thesaurus

Noun

chemisorption - adsorption (especially when irreversible) by means of chemical instead of physical forces; "chemisorption of gaseous nitrogen on iron catalysts"chemosorptionadsorption, surface assimilation - the accumulation of molecules of a gas to form a thin film on the surface of a solid

Chemisorption

chemisorption

[′kem·i‚sȯrp·shən] (physical chemistry) A chemical adsorption process in which weak chemical bonds are formed between gas or liquid molecules and a solid surface.

Chemisorption

the adsorption of substances from the surrounding medium by a liquid or solid, accompanied by the formation of chemical compounds. In a narrower sense, chemisorption is regarded as the chemical binding of a substance by the surface of a solid, or chemical adsorption.

Considerable heat is released in chemisorption: the heat of chemisorption is usually 84–126 kilojoules per mole (kJ/mole), or 20–30 kcal/mole; in some cases—for example, the chemisorption of oxygen on metals—it may exceed 420 kJ/mole (100 kcal/mole). Like chemical reactions, chemisorption usually requires considerable activation energy. Thus, chemisorption is accelerated when the temperature is increased (activated adsorption). Chemisorption is selective—that is, it depends on the chemical affinity of the adsorbed substance for the solid surface.

Physical methods, such as spectroscopy, electron paramagnetic resonance, nuclear magnetic resonance, electron and ion field-emission microscopy, and slow-electron diffraction, are used to study chemisorption. The process plays an important role in heterogeneous catalysis, gas purification, and vacuum technology.

REFERENCES

See references under ADSORPTION.

M. U. KISLIUK

chemisorption

chem·i·sorb

chemisorption

chem•i•sorp•tion

Chemisorption

chemisorption

Chemisorption

REFERENCES

chemisorption

Synonyms for chemisorption

noun adsorption (especially when irreversible) by means of chemical instead of physical forces

Synonyms

Related Words