In one-shot, the isocyanate, polyester or polyether resin, catalyst, and other additives are mixed directly and a foam is produced immediately.

Keem BayAchill Archaeological Field School is based at the Achill Archaeology Centre in Dooagh, which has served as a catalyst for a wide array of archaeological investigations on the island.

Mass production via assembly lines is widely considered to be the catalyst which initiated the modern consumer culture by making possible low unit cost for manufactured goods.

The reaction is carried out under pressure at a temperature of 200 ° C in the presence of a metallic catalyst.

The decoloration of a solution of bromine in water with dichloromethylene as catalyst is an analytical test for the presence of alkenes:

* Using a suitable catalyst ( e. g. Wilkinson's catalyst ), it is possible to reduce just one of the double bonds of an allene.

The steam cracking of alkanes affords a few percent acetylene, which is selectively hydrogenated in the presence of a palladium / silver catalyst.

For more complex alkynes, the Lindlar catalyst is widely recommended to avoid formation of the alkane, for example in the conversion of phenylacetylene to styrene.

The catalyst will speed up both reactions thereby increasing the speed at which equilibrium is reached.

Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst.

Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself.

A Nanomaterial-based catalyst is an example of a heterogeneous catalyst.

The most common catalyst is the hydrogen ion ( H < sup >+</ sup >).

The rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

The following is a typical reaction scheme, where C represents the catalyst, X and Y are reactants, and Z is the product of the reaction of X and Y:

Although the catalyst is consumed by reaction 1, it is subsequently produced by reaction 4, so for the overall reaction:

The fact that a catalyst does not change the equilibrium is a consequence of the second law of thermodynamics.

Production of energy is a necessary result since reactions are spontaneous if and only if Gibbs free energy is produced, and if there is no energy barrier, there is no need for a catalyst.

Any chemical species that is regenerated, such as a catalyst, also has a stoichiometric coefficient of zero.

The hot regenerated catalyst is then circulated back to the reactor to complete its cycle.

The " regenerated " catalyst then flows to the base of the riser, repeating the cycle.

* Characterize catalyst flow in spent or regenerated catalyst standpipes

Finally, a chloride atom combines with the released proton to form HCl, and the AlCl < sub > 3 </ sub > catalyst is regenerated:

Nitrogen oxides are absorbed and regenerated in the process, and thus serve as a catalyst for the overall reaction:

The product is formed by dissociation and the catalyst ligand complex is regenerated for further reaction cycles.

The catalyst should be regenerated or replaced as needed.

The NADPH cofactor is regenerated in each catalytic cycle by action of a second dehydrogenase enzyme which consumes isopropanol as a sacrificial catalyst.

As the name implies, the sacrificial catalyst is not regenerated and irreversibly consumed, thereby not a catalyst at all.

Adding a catalyst will affect both the forward reaction and the reverse reaction in the same way and will not have an effect on the equilibrium constant.

A catalyst works by providing an alternative reaction pathway to the reaction product.

Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process regenerating the catalyst.

The intermediate reaction states were: HO < sub > 2 </ sub >, H < sub > 2 </ sub > O < sub > 2 </ sub >, then H < sub > 3 </ sub > O < sub > 2 </ sub > and the final reaction product ( water molecule dimers ), after which the water molecule desorbs from the catalyst surface.

Generic potential energy diagram showing the effect of a catalyst in a hypothetical exothermic chemical reaction X + Y to give Z.

The presence of the catalyst opens a different reaction pathway ( shown in red ) with a lower activation energy.

The catalyst may increase reaction rate or selectivity, or enable the reaction at lower temperatures.

Introducing the catalyst to the system would result in reaction to move to the new equilibrium, producing energy.

More often, the support and the catalyst interact, affecting the catalytic reaction.

Geoff usually appears in private conversations in his office with Mike, and is often the catalyst for Mike to question the reassurance he has been given by a producer that the story of the moment is being ethically pursued.

The cathode catalyst is often made up of nickel but it can also be a nanomaterial-based catalyst.

The 1985 series Robotech is most often credited as the catalyst for the Western interest in anime.

Nitrogen fertilizers are often made using the Haber-Bosch process ( invented about 1915 ) which uses natural gas ( CH < sub > 4 +)</ sub > for the hydrogen and nitrogen gas ( N < sub > 2 </ sub >) from the air at an elevated temperature and pressure in the presence of a catalyst to form ammonia ( NH < sub > 3 </ sub >) as the end product.

The play was set in the village of Bird-in-Hand and is often credited as a catalyst for the boom in Pennsylvania Dutch Country tourism in the mid-twentieth century.

Dream pop is often credited with providing the creative " anti-rock " catalyst for textural-based musical styles such as trip hop, slowcore, and post-rock.

These reactions are often catalyzed by the addition of an acid or base catalyst.

OD is a lifelong, built-in mechanism to improve immunity of organization's health to renew itself inclusive principles, often with the assistance of a change agent or catalyst and the use of enabling appropriate theories and techniques from applied behavioral sciences, anthropology, sociology, and phenomenology.

Indian cuisine has also shaped the history of international relations ; the spice trade between India and Europe is often cited by historians as the primary catalyst for Europe's Age of Discovery.

# precipitating factors-discontent usually requires a catalyst ( often a specific event ) to turn it into a social movement

While the confrontation between the two sets of supporters was often labelled as ' Sectarianism ', ' Native-Immigrant tension ' was an equally accurate catalyst for hostility between the two teams ' supports in Scotland.

Either material is designed to provide a high surface area to support the catalyst washcoat, and therefore is often called a " catalyst support ".

# The catalyst itself is most often a precious metal.

Examples most often cited as successes include Temple Bar in Dublin where tourism was attracted to a bohemian ' cultural quarter ', Barcelona where the 1992 Olympics provided a catalyst for infrastructure improvements and the redevelopment of the water front area, and Bilbao where the building of a new art museum was the focus for a new business district around the city's derelict dock area.

He was often described as the face and catalyst of a new consumerist urban society, and that he has managed to personify " the restless spirit of post-liberalization, ambitious, assertive and yet feel-good India.

One of the themes of Monster is how individuals are capable of behaving monstrously, and Johan often acts as a direct or indirect catalyst for such behavior.

Although many people saw the eventual sale of Robbie Keane in 2000 as the principal catalyst in Coventry City's 2001 relegation, the goalscoring deficit left by the sale of Dion Dublin is often overlooked.

The resonance is most often heard when the fundamental frequency of the string is in unison or an octave lower or higher than the catalyst note, although it can occur for other intervals, such as a fifth, with less effect.

Mrs. Biddell, whose first name has not been recorded, was sent to a workhouse, and her ultimate fate is unknown ; however, her story became a catalyst for those who actively opposed the wretched conditions of England ’ s working poor, who often spent seven days a week labouring under inhuman conditions, barely managing to survive and with no prospect for relief.

This gene often lay dormant until a moment of extraordinary physiological stress activated it, and upon activation it would use the source of the biostress as a catalyst for " genetic change ," resulting in metahuman abilities.

With Roback as its musical catalyst, Opal were a direct precursor to Mazzy Star musically — often featuring the same psychedelic guitar drones and similar hints of blues and folk that would later appear on Mazzy Star recordings.