Definition of catalyst in English:

catalyst

noun ˈkat(ə)lɪstˈkæd(ə)ləst

1A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
chlorine acts as a catalyst promoting the breakdown of ozone
Example sentencesExamples
- Some germanium is also used to make semiconductors, catalysts, and specialized glass for military weapon-sighting systems.
- The one exception is that it is sometimes used as a catalyst in the petroleum industry.
- Silicone surfactants, and amine and tin catalysts, are also used.
- The key tools will be new breeds of enzymes - protein catalysts that speed up chemical reactions in cells.
- The element is also used to make dyes, photographic film, specialized soaps, and catalysts.
- Finally, a relatively small amount of rhenium is used to make catalysts for the petroleum industry.
- Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene.
- Instead, we started to look further afield at copper-based catalysts that had been rejected during the initial ester hydrogenation testwork.
- In fact, zeolites are the main catalysts in petrochemical refineries today.
- When temperature is increased, synthetic catalysts can become just as active as enzymes.
- Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals.
- He attempted to polymerize ethylene using catalysts at a much lower pressure than that used by the British process.
- Ionic liquids usefully form one of the phases because they don't mix with many organic solvents, but readily dissolve metals used as catalysts.
- Heterogeneous catalysts are materials that increase the rate of a reaction, but are not in the same phase as the reactants.
- Most converters use platinum or palladium metal catalysts that convert carbon monoxide and hydrocarbons to carbon dioxide and water vapor.
- Chemicals in the catalytic converter act as catalysts, changing the highly hazardous gas compounds to less harmful ones.
- These versatile molecules function as catalysts in the hydrogen peroxide bleaching process.
- Solid oxide catalysts are commonly used for chemical and refinery operations.
- Enzymes are the biological substance that act as catalysts and help complex reactions occur everywhere in life.
- All of the platinum-group metals are good catalysts: they speed up the rate of certain chemical reactions.
Synonyms
channel, medium, means, means of expression, agency, agent, instrument, mechanism, organ, apparatus, structure, machine, machinery
1. 1.1 A person or thing that precipitates an event.
  the prime minister's speech acted as a catalyst for debate
  Example sentencesExamples
  The beach becomes the catalyst which encourages them to break society's rules.
  The film's other characters are secondary, and often serve little purpose beyond acting as catalysts.
  More importantly, it was about inspired individuals being the catalysts of effecting new possibilities.
  In Scotland, it has always been Catholic schools which have been the catalyst for this debate.
  It will hopefully act as a catalyst for more formal public education in the future.
  The event was to be used as a catalyst for change and to bring new hope to residents in rundown areas of the city.
  Events, individuals, circumstances and situations are catalysts for transformations in culture.
  It is the union of the latter two that provides the catalyst for the events that follow.
  On the second issue, the crisis also served as a catalyst to the birth of a more responsible and braver press.
  The Parliamentary debate on this report was the actual catalyst which prompted the minister to resign.
  Historical and meaningful events such as this often act as a catalyst for change.
  This is the catalyst for a chain of events which threatens to destabilise the parliament.
  Public opinion polls often serve as catalysts for such debates.
  All three shocks have caused, or been a catalyst for, a serious downturn in western economies.
  If there is any catalyst to get the team motivated for next season it will be this performance in the nationals.
  It is amazing what acts as a catalyst to spur people on to do something about a situation.
  Though the film is around these two men, it is the women who play the catalyst to all the events and add momentum to the story.
  I hope that it will be a catalyst for an ongoing debate and discussion in our field.
  There are many events however that serve as catalysts for the big historic shifts.
  The primary catalysts that induced this growth were the end-user industries, communications, and computers, in particular.
  Synonyms
  stimulus, stimulation, motivation, motivating force, fillip, encouragement, influence, muse, goad, spur, lift, boost, incentive, incitement, impulse

Origin

Early 20th century: from catalysis, on the pattern of analyst.

Rhymes

philatelist

Definition of catalyst in US English:

catalyst

nounˈkad(ə)ləstˈkæd(ə)ləst

1A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Example sentencesExamples
- These versatile molecules function as catalysts in the hydrogen peroxide bleaching process.
- Instead, we started to look further afield at copper-based catalysts that had been rejected during the initial ester hydrogenation testwork.
- Ionic liquids usefully form one of the phases because they don't mix with many organic solvents, but readily dissolve metals used as catalysts.
- When temperature is increased, synthetic catalysts can become just as active as enzymes.
- Solid oxide catalysts are commonly used for chemical and refinery operations.
- He attempted to polymerize ethylene using catalysts at a much lower pressure than that used by the British process.
- In fact, zeolites are the main catalysts in petrochemical refineries today.
- Some germanium is also used to make semiconductors, catalysts, and specialized glass for military weapon-sighting systems.
- Silicone surfactants, and amine and tin catalysts, are also used.
- Heterogeneous catalysts are materials that increase the rate of a reaction, but are not in the same phase as the reactants.
- Finally, a relatively small amount of rhenium is used to make catalysts for the petroleum industry.
- Most converters use platinum or palladium metal catalysts that convert carbon monoxide and hydrocarbons to carbon dioxide and water vapor.
- The element is also used to make dyes, photographic film, specialized soaps, and catalysts.
- The one exception is that it is sometimes used as a catalyst in the petroleum industry.
- Chemicals in the catalytic converter act as catalysts, changing the highly hazardous gas compounds to less harmful ones.
- Enzymes are the biological substance that act as catalysts and help complex reactions occur everywhere in life.
- Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals.
- The key tools will be new breeds of enzymes - protein catalysts that speed up chemical reactions in cells.
- Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene.
- All of the platinum-group metals are good catalysts: they speed up the rate of certain chemical reactions.
Synonyms
channel, medium, means, means of expression, agency, agent, instrument, mechanism, organ, apparatus, structure, machine, machinery
1. 1.1 A person or thing that precipitates an event.
  the governor's speech acted as a catalyst for debate
  Example sentencesExamples
  This is the catalyst for a chain of events which threatens to destabilise the parliament.
  Historical and meaningful events such as this often act as a catalyst for change.
  It will hopefully act as a catalyst for more formal public education in the future.
  If there is any catalyst to get the team motivated for next season it will be this performance in the nationals.
  The film's other characters are secondary, and often serve little purpose beyond acting as catalysts.
  There are many events however that serve as catalysts for the big historic shifts.
  The Parliamentary debate on this report was the actual catalyst which prompted the minister to resign.
  It is amazing what acts as a catalyst to spur people on to do something about a situation.
  Events, individuals, circumstances and situations are catalysts for transformations in culture.
  Though the film is around these two men, it is the women who play the catalyst to all the events and add momentum to the story.
  The beach becomes the catalyst which encourages them to break society's rules.
  On the second issue, the crisis also served as a catalyst to the birth of a more responsible and braver press.
  More importantly, it was about inspired individuals being the catalysts of effecting new possibilities.
  The primary catalysts that induced this growth were the end-user industries, communications, and computers, in particular.
  All three shocks have caused, or been a catalyst for, a serious downturn in western economies.
  In Scotland, it has always been Catholic schools which have been the catalyst for this debate.
  I hope that it will be a catalyst for an ongoing debate and discussion in our field.
  Public opinion polls often serve as catalysts for such debates.
  The event was to be used as a catalyst for change and to bring new hope to residents in rundown areas of the city.
  It is the union of the latter two that provides the catalyst for the events that follow.
  Synonyms
  stimulus, stimulation, motivation, motivating force, fillip, encouragement, influence, muse, goad, spur, lift, boost, incentive, incitement, impulse

Origin

Early 20th century: from catalysis, on the pattern of analyst.

单词	catalyst
释义	Definition of catalyst in English: catalyst noun ˈkat(ə)lɪstˈkæd(ə)ləst 1A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. chlorine acts as a catalyst promoting the breakdown of ozone Example sentencesExamples Some germanium is also used to make semiconductors, catalysts, and specialized glass for military weapon-sighting systems. The one exception is that it is sometimes used as a catalyst in the petroleum industry. Silicone surfactants, and amine and tin catalysts, are also used. The key tools will be new breeds of enzymes - protein catalysts that speed up chemical reactions in cells. The element is also used to make dyes, photographic film, specialized soaps, and catalysts. Finally, a relatively small amount of rhenium is used to make catalysts for the petroleum industry. Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene. Instead, we started to look further afield at copper-based catalysts that had been rejected during the initial ester hydrogenation testwork. In fact, zeolites are the main catalysts in petrochemical refineries today. When temperature is increased, synthetic catalysts can become just as active as enzymes. Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals. He attempted to polymerize ethylene using catalysts at a much lower pressure than that used by the British process. Ionic liquids usefully form one of the phases because they don't mix with many organic solvents, but readily dissolve metals used as catalysts. Heterogeneous catalysts are materials that increase the rate of a reaction, but are not in the same phase as the reactants. Most converters use platinum or palladium metal catalysts that convert carbon monoxide and hydrocarbons to carbon dioxide and water vapor. Chemicals in the catalytic converter act as catalysts, changing the highly hazardous gas compounds to less harmful ones. These versatile molecules function as catalysts in the hydrogen peroxide bleaching process. Solid oxide catalysts are commonly used for chemical and refinery operations. Enzymes are the biological substance that act as catalysts and help complex reactions occur everywhere in life. All of the platinum-group metals are good catalysts: they speed up the rate of certain chemical reactions. Synonyms channel, medium, means, means of expression, agency, agent, instrument, mechanism, organ, apparatus, structure, machine, machinery 1.1 A person or thing that precipitates an event. the prime minister's speech acted as a catalyst for debate Example sentencesExamples The beach becomes the catalyst which encourages them to break society's rules. The film's other characters are secondary, and often serve little purpose beyond acting as catalysts. More importantly, it was about inspired individuals being the catalysts of effecting new possibilities. In Scotland, it has always been Catholic schools which have been the catalyst for this debate. It will hopefully act as a catalyst for more formal public education in the future. The event was to be used as a catalyst for change and to bring new hope to residents in rundown areas of the city. Events, individuals, circumstances and situations are catalysts for transformations in culture. It is the union of the latter two that provides the catalyst for the events that follow. On the second issue, the crisis also served as a catalyst to the birth of a more responsible and braver press. The Parliamentary debate on this report was the actual catalyst which prompted the minister to resign. Historical and meaningful events such as this often act as a catalyst for change. This is the catalyst for a chain of events which threatens to destabilise the parliament. Public opinion polls often serve as catalysts for such debates. All three shocks have caused, or been a catalyst for, a serious downturn in western economies. If there is any catalyst to get the team motivated for next season it will be this performance in the nationals. It is amazing what acts as a catalyst to spur people on to do something about a situation. Though the film is around these two men, it is the women who play the catalyst to all the events and add momentum to the story. I hope that it will be a catalyst for an ongoing debate and discussion in our field. There are many events however that serve as catalysts for the big historic shifts. The primary catalysts that induced this growth were the end-user industries, communications, and computers, in particular. Synonyms stimulus, stimulation, motivation, motivating force, fillip, encouragement, influence, muse, goad, spur, lift, boost, incentive, incitement, impulse Origin Early 20th century: from catalysis, on the pattern of analyst. Rhymes philatelist Definition of catalyst in US English: catalyst nounˈkad(ə)ləstˈkæd(ə)ləst 1A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. Example sentencesExamples These versatile molecules function as catalysts in the hydrogen peroxide bleaching process. Instead, we started to look further afield at copper-based catalysts that had been rejected during the initial ester hydrogenation testwork. Ionic liquids usefully form one of the phases because they don't mix with many organic solvents, but readily dissolve metals used as catalysts. When temperature is increased, synthetic catalysts can become just as active as enzymes. Solid oxide catalysts are commonly used for chemical and refinery operations. He attempted to polymerize ethylene using catalysts at a much lower pressure than that used by the British process. In fact, zeolites are the main catalysts in petrochemical refineries today. Some germanium is also used to make semiconductors, catalysts, and specialized glass for military weapon-sighting systems. Silicone surfactants, and amine and tin catalysts, are also used. Heterogeneous catalysts are materials that increase the rate of a reaction, but are not in the same phase as the reactants. Finally, a relatively small amount of rhenium is used to make catalysts for the petroleum industry. Most converters use platinum or palladium metal catalysts that convert carbon monoxide and hydrocarbons to carbon dioxide and water vapor. The element is also used to make dyes, photographic film, specialized soaps, and catalysts. The one exception is that it is sometimes used as a catalyst in the petroleum industry. Chemicals in the catalytic converter act as catalysts, changing the highly hazardous gas compounds to less harmful ones. Enzymes are the biological substance that act as catalysts and help complex reactions occur everywhere in life. Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals. The key tools will be new breeds of enzymes - protein catalysts that speed up chemical reactions in cells. Many alkyl halides, alcohols, or alkenes can be reacted with benzene in the presence of certain catalysts to give an alkyl benzene. All of the platinum-group metals are good catalysts: they speed up the rate of certain chemical reactions. Synonyms channel, medium, means, means of expression, agency, agent, instrument, mechanism, organ, apparatus, structure, machine, machinery 1.1 A person or thing that precipitates an event. the governor's speech acted as a catalyst for debate Example sentencesExamples This is the catalyst for a chain of events which threatens to destabilise the parliament. Historical and meaningful events such as this often act as a catalyst for change. It will hopefully act as a catalyst for more formal public education in the future. If there is any catalyst to get the team motivated for next season it will be this performance in the nationals. The film's other characters are secondary, and often serve little purpose beyond acting as catalysts. There are many events however that serve as catalysts for the big historic shifts. The Parliamentary debate on this report was the actual catalyst which prompted the minister to resign. It is amazing what acts as a catalyst to spur people on to do something about a situation. Events, individuals, circumstances and situations are catalysts for transformations in culture. Though the film is around these two men, it is the women who play the catalyst to all the events and add momentum to the story. The beach becomes the catalyst which encourages them to break society's rules. On the second issue, the crisis also served as a catalyst to the birth of a more responsible and braver press. More importantly, it was about inspired individuals being the catalysts of effecting new possibilities. The primary catalysts that induced this growth were the end-user industries, communications, and computers, in particular. All three shocks have caused, or been a catalyst for, a serious downturn in western economies. In Scotland, it has always been Catholic schools which have been the catalyst for this debate. I hope that it will be a catalyst for an ongoing debate and discussion in our field. Public opinion polls often serve as catalysts for such debates. The event was to be used as a catalyst for change and to bring new hope to residents in rundown areas of the city. It is the union of the latter two that provides the catalyst for the events that follow. Synonyms stimulus, stimulation, motivation, motivating force, fillip, encouragement, influence, muse, goad, spur, lift, boost, incentive, incitement, impulse Origin Early 20th century: from catalysis, on the pattern of analyst.
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