catalystn.

Brit.

/ˈkatəlɪst/,

/ˈkatl̩ɪst/, U.S.

/ˈkædləst/

Etymology: < catalysis n., on the analogy of analyst.

Chemistry.

A substance which when present in small amounts increases the rate of a chemical reaction or process but which is chemically unchanged by the reaction; a catalytic agent. (A substance which similarly slows down a reaction is occasionally called a negative catalyst.) Also figurative.

ΘΚΠ

the world > matter > chemistry > chemical reactions or processes > [noun] > processes or substances affecting reactions > catalysis > catalyst

accelerator1864

catalysator1893

catalysor1901

catalyst1902

catalyser1904

the world > time > change > change to something else, transformation > [noun] > cause of transformation

forschuppild?c1225

converter1533

transformer1601

plantator1616

transformator1617

transmogrifier1676

new broom1799

transformist1799

denaturalizer1832

catalyser1904

wind (also winds) of change1905

catalyst1943

touchpaper1968

1902 Nature 3 Apr. 523/1 No reactions are possible under the influence of catalysts that could not take place in their absence without a breach of one of the laws of energy.

1920 Chambers's Jrnl. 284/1 Nickel is used as a ‘catalyst’, or a carrier of hydrogen in the hydrogenation.. of oils for use in the manufacture of margarine.

1927 J. B. S. Haldane & J. S. Huxley Animal Biol. viii. 169 We have begun to isolate many of the intermediate products of metabolism and the catalysts that govern the course of the reactions by which they are formed.

1943 H. Read Politics of Unpolitical xiv. 160 Shelley called poets the unacknowledged legislators of the world, and the epithet was well chosen. The catalyst is unchanged, unabsorbed; its activity therefore not acknowledged.

1948 S. Glasstone Textbk. Physical Chem. (ed. 2) xiii. 1126 If the reaction is hindered by the added substance it is said to be a negative catalyst, and the word catalyst, when used alone, is almost invariably taken to imply acceleration of the chemical process.

1953 Sci. News 28 117 There is no reason why a catalyst..should be rendered totally inactive by a change in the geometry of the substance acted upon.

1954 J. I. M. Stewart Mark Lambert's Supper 139 In the intricate chemistry that gives motive-power to the machine he has himself acted as an obscure catalyst.

1968 A. White et al. Princ. Biochem. (ed. 4) x. 209 Enzymes are catalysts peculiar to living matter.

This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2021).

单词	catalyst
释义	catalystn. Brit. /ˈkatəlɪst/, /ˈkatl̩ɪst/, U.S. /ˈkædləst/ Etymology: < catalysis n., on the analogy of analyst. Chemistry. A substance which when present in small amounts increases the rate of a chemical reaction or process but which is chemically unchanged by the reaction; a catalytic agent. (A substance which similarly slows down a reaction is occasionally called a negative catalyst.) Also figurative. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > [noun] > processes or substances affecting reactions > catalysis > catalyst accelerator1864 catalysator1893 catalysor1901 catalyst1902 catalyser1904 the world > time > change > change to something else, transformation > [noun] > cause of transformation forschuppild?c1225 converter1533 transformer1601 plantator1616 transformator1617 transmogrifier1676 new broom1799 transformist1799 denaturalizer1832 catalyser1904 wind (also winds) of change1905 catalyst1943 touchpaper1968 1902 Nature 3 Apr. 523/1 No reactions are possible under the influence of catalysts that could not take place in their absence without a breach of one of the laws of energy. 1920 Chambers's Jrnl. 284/1 Nickel is used as a ‘catalyst’, or a carrier of hydrogen in the hydrogenation.. of oils for use in the manufacture of margarine. 1927 J. B. S. Haldane & J. S. Huxley Animal Biol. viii. 169 We have begun to isolate many of the intermediate products of metabolism and the catalysts that govern the course of the reactions by which they are formed. 1943 H. Read Politics of Unpolitical xiv. 160 Shelley called poets the unacknowledged legislators of the world, and the epithet was well chosen. The catalyst is unchanged, unabsorbed; its activity therefore not acknowledged. 1948 S. Glasstone Textbk. Physical Chem. (ed. 2) xiii. 1126 If the reaction is hindered by the added substance it is said to be a negative catalyst, and the word catalyst, when used alone, is almost invariably taken to imply acceleration of the chemical process. 1953 Sci. News 28 117 There is no reason why a catalyst..should be rendered totally inactive by a change in the geometry of the substance acted upon. 1954 J. I. M. Stewart Mark Lambert's Supper 139 In the intricate chemistry that gives motive-power to the machine he has himself acted as an obscure catalyst. 1968 A. White et al. Princ. Biochem. (ed. 4) x. 209 Enzymes are catalysts peculiar to living matter. This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2021). < n.1902
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