Q:chemistry subject

A catalyst is a substance which alters the rate of a chemical reaction but is chemically unchanged at the end of the reaction there are well some of em are 2,2'-Bis(2-indenyl) biphenyl Adams' catalyst Band 3 Cerium(IV) oxide Copper(II) acetate Copper(II) hydroxide Cyclooctadiene rhodium chloride dimer 4-Dimethylaminopyridine Enzyme engineering Faujasite Frustrated Lewis pair Grubbs' catalyst Hopcalite Incipient Wetness Impregnation Lanthanide triflates Lindlar catalyst Mesoporous silicates Methylaluminoxane NOBIN Nickel(III) oxide Noxer block Palladium on carbon Phase transfer catalyst Platinum Polyoxometalate P cont. Post-metallocene catalyst 2-Pyridone Pyrotol catalyst Raney nickel Ribozyme Tetrakis(triphenylphosphine)palladium(... Tetrakis(triphenylphosphine)platinum(0... Triazabicyclodecene Tris(dibenzylideneacetone)dipalladium(... Trost ligand Vanadium(V) oxide Wilkinson's catalyst Ziegler-Natta catalyst

Q:what is metallocene catalyst technology?

Metallocene catalyst A transition-metal atom sandwiched between ring structures having a well-defined single catalytic site and well-understood molecular structure used to produce uniform polyolefins with unique structures and physical properties. See also Catalysis; Coordination chemistry; Coordination complexes; Metallocenes; Organometallic compound. In the early 1980s, W. Kaminsky discovered that an appropriate co-catalyst activated metallocene compounds of group 4 metals, that is, titanium, zirconium, and hafnium, for alpha-olefin polymerization, attracting industrial interest. This observation led to the synthesis of a great number of metallocene compounds for the production of polymers already made industrially, such as polyethylene and polypropylene, and new materials. Polymers produced with metallocene catalysts represent a small fraction of the entire polyolefin market, but experts agree that such a fraction will increase rapidly in the future. See also Polymer; Polymerization; Polyolefin resins.

Q:What is a Catalyst?

Catalysts are something that will speed up a reaction. Catalysts are usually acids but platinum catalysts are used in the industrial production of nitric acid (4 NH3 + 5 O2 ---4 NO + 6 H2O). Vanadium pentoxide is used as the catalyst in the industrial manufacture of sulfuric acid (S + O2 ---SO2. 2 SO2 + O2 ---2 SO3) The catalyst is used to make the reaction between sulfur dioxide and oxygen A LOT faster. Catalysts are also used in explosives. The most common is sulfuric acid (eg. nitroglycerin, TNT, nitrocellulose). Weaker acids like citric acid is used in the synthesis of HMTD, an organic peroxide. Hydrochloric acid is also a commonly used catalyst. Manganese dioxide can be used as a catalyst to generate oxygen when added to potassium chlorate or hydrogen peroxide. (2 H2O2 + MnO2 ---2 H2O + O2 + MnO2 (it is not necessary to include the catalyst in an equation, however). (2 KClO3 + MnO2 ---3 O2 + 2 KCl + MnO2).

Q:What is the principle of catalyst reaction rate in chemical reactions?

Whether the chemical reaction can be carried out according to the change of free energy, but only according to the change of free energy can not determine whether the reaction can be completed, because the chemical reaction is also completed by the reaction of the energy barrier, that is, if the reaction energy barrier is high, To provide some energy, across the barrier, to complete the reaction. The energy barrier is called activation energy. And the role of the catalyst is to reduce the activation energy, so that in a relatively harsh environment, chemical reaction occurs.

Q:a) A catalyst such as chlorophyll must be present for some reactions to take place.b) A catalyst such as chlorophyll is not one of the products of a chemical reaction.c) A catalyst such as chlorophyll is not a substance that is used or changed in a chemical reaction.

It's not C, catalysts are not used up or changed in a chemical reaction, otherwise they would be part of the reaction. Technically B isn't right either because chlorophyll IS the result of a chemical reaction, a bunch of very complex reactions, how else would it come into existence? However I believe this is the answer you're looking for since I'm being too picky... Isn't not A, catalysts do not cause reactions to occur that wouldn't otherwise, they do speed them up considerably though, to the point of it seeming like it must be present for the reaction to take place since it would be so incredibly slow if it wasn't there, but I'm being to picky again... So I would say B.

Q:What is the difference between electrocatalysis and general chemical catalysis?

General chemical catalysis is a catalyst, and electrocatalysis also need to be carried out under the conditions of the electric field

Q:In the chemical reaction, why can the catalyst speed up the reaction rate

V2O5 (vanadium pentoxide) catalyzes the oxidation of sulfur dioxide to sulfur trioxide, and no catalyst is difficult to occur.

Q:Can the catalyst be a reactant in chemistry?

There is also a saying that the catalyst participates in the chemical reaction. In a general chemical reaction, the effect of the catalyst is to reduce the activation energy required for the reaction to occur, essentially to turn a more difficult reaction into two, In the second reaction, the catalyst in the first reaction plays the role of the reactant, and the catalyst in the second reaction plays the role of the product, so that the catalyst is not present before and after the reaction Variety.

Q:Chemical reactions in the presence of impurities will cause catalyst poisoning, how to understand this sentence

In fact, the magazine and the catalyst reaction, making the catalyst deterioration or activity decreased

Q:Could you tell me all the differences between those two catalysts? Thank you very much.

Biochemical Catalyst