Do catalysts participate in chemical reactions, please explain briefly

The current theory generally holds that the catalyst participates in the reaction to form an intermediate, and then the intermediate decomposes to form the catalyst, so the mass and properties remain unchanged before and after the reaction. It has been experimentally proved that although the properties and mass of the catalyst remain unchanged, some aspects of the catalyst such as morphological changes, pre-reaction lumpy, post-reaction powder, indirectly prove the above theory. Nowadays, high school questions are generally done according to this theory.

For example, copper oxidizes to copper oxide, and copper oxide then oxidizes ethanol to acetaldehyde, which is reduced to copper, so copper is a catalyst for the oxidation of ethanol to acetaldehyde.

It's just the scope of high school.

Strictly speaking, participated. The catalyst and the reaction product form an intermediate product (or transition state) that consumes much less energy than the direct product, which then reacts to become the product. However, the total formula of the chemical equation does not reflect the catalyst's participation in the reaction.

The catalyst is not consumed in the chemical reaction. They can be separated from the reactants both before and after the reaction. However, it is possible that they will be consumed at one stage of the reaction and then reproduced before the end of the reaction.

Catalysts generally do not participate in chemical reactions, but can only change the activity of the reactive substance.

This is a certain part of the reaction, and some physical properties (such as crystal type, etc.) will change. It's just that the chemical composition before and after the reaction is almost unchanged, and the mass before and after the reaction does not change much.

There are those who generally participate, and there are those who do not.

The role of catalyst in chemical reaction is to change the activation energy that needs to be achieved by the reaction, and the one that can reduce the activation energy is called a positive catalyst (that is, a catalyst in the usual sense), and the one that increases the activation energy is a negative catalyst.

There are many examples of positive catalysts, such as various enzymes;

Negative catalysts can be used to control the reaction rate (for example, some reactions are too fast, and a large amount of energy is released instantaneously to cause danger, and can be added), and the common ones are antioxidants.

Catalyst is a substance that can change the chemical reaction rate of other substances in a chemical reaction, and its own mass and chemical properties do not change before and after the chemical reaction, also known as catalyst.

Catalysts can change the rate of chemical reactions of other substances.

The role of the catalyst is to change the rate of chemical reactions, that is, to play a catalytic role.

About the use of catalysts:

1.Catalysts are for a particular reaction, not all reactions, e.g. in hydrogen peroxide? In the experimental process of potassium chlorate to oxygen, we use manganese dioxide as a catalyst, but it does not mean that manganese dioxide is the catalyst for all reactions, it is only the catalyst for this kind of reaction, which needs to be understood clearly.

2.Different catalysts can be used for the same reaction, which is not fixed, so when we talk about hydrogen peroxide to oxygen, there are many ways to solve the reaction rate, such as using copper sulfate or iron oxide.

3.The catalyst can be reused. After the reaction is completed, the catalyst can be dried and left for continued use next time to achieve the effect of reuse and avoid waste.

The catalyst must participate in the reaction before the reaction rate can be changed, but in the end, the mass and chemical properties of the catalyst have not changed, and the physical properties must have changed.

The catalyst participates in the reaction, changes the pathway of the reaction, and reduces the energy required for the reaction (that is, the activation energy), so that the reaction rate can be changed.

Co-catalyst is a small amount of substances added to the catalyst, is the auxiliary component of the catalyst, itself has no activity or little activity, but after they are added to the catalyst, they can change the chemical composition, chemical structure, ionic valence state, lattice structure, surface structure, pore structure, dispersion state, mechanical strength, etc., so as to improve the activity, selectivity, stability and life of the catalyst.

The catalyst has no participation in the chemical reaction.

The catalyst is involved in the anti-baiyingdu, but in the process of the reaction

It's a step-by-step dao, and its form is not in effect.

Version, which is equivalent to not having the right to participate in the reaction. The function of the catalyst is to reduce the activation energy of the reaction, turning the original reaction into two or more reactions, the activation energy of each sub-reaction is very low, the reaction is very good, and the effect is that the overall reaction becomes faster. Understand? Hope to adopt.

Secondary school textbooks are defined as the catalyst.

Itself does not participate in self.

Chemical reactions.

But in fact, in the whole chemical process, the catalyst is involved in the reaction at the beginning, the catalyst is consumed, but the catalyst is finally generated, which is equivalent to no participation, for example, iron ions catalyze the hydrogen peroxide decomposition reaction.

Start 2Fe(3+)+H2O2=2Fe(2+)+O2+2H(+)2Fe(2+)+H2O2+2H(+)=2Fe(3+)+2H2OTwo plus yes.

2h2o2=fe3+=2h2o+o2↑

Catalysts may participate in chemical reactions, but the composition and quantity of catalysts before and after the reaction are unchanged. For example, the laboratory decomposes potassium permanganate to produce oxygen, using manganese dioxide as a catalyst, and another catalyst is a catalyst, such as iron catalyst.

In a chemical reaction, a substance that can change the chemical reaction rate of reactants (increase or decrease) without changing the chemical equilibrium, and its own quality and chemical properties have not changed before and after the chemical reaction is called a catalyst (solid catalyst is also called a catalyst). According to statistics, more than 90% of industrial processes use catalysts, such as chemical, petrochemical, biochemical, environmental protection, etc.

Participate in the reaction. However, the quality of the catalyst before and after the reaction remains unchanged, which often plays a role as an intermediary reaction.

There are two mechanisms of catalytic recycler:

1. The catalyst participates in the reaction process and is reduced to the original component after the reaction is completed. For example, potassium manganate is added when pyrolysis of potassium permanganate.

In the decomposition process of potassium permanganate, potassium manganate is involved in the reaction, and the specific way is unclear. Finally, it appears as potassium manganate. The morphology of the catalyst changes before and after the reaction, the particles become powder, the powder becomes granules, and so on.

2. The catalyst does not participate in the reaction, such as in the platinum-rhodium alloy network, nitrogen and hydrogen react to form ammonia. The platinum-rhodium alloy mesh provides electrons during the reaction (or a similar effect, the details are not clear, but it does not react itself), and the morphology of the platinum-rhodium alloy mesh does not change before and after the reaction.

Friend, please [adopt the answer], your adoption is the motivation for me to answer the question, thank you.