What are the ways to store and produce hydrogen?

Ten questions about the preparation of oxygen in the laboratory.

1) When heating the solid drug in the test tube, why should the nozzle be slightly tilted downward?

Answer: Prevent condensate from backing up to the heating part of the test tube during heating, causing the test tube to rupture.

2) After the mouth of the test tube is plugged with a rubber plug with a catheter, why should the catheter in the test tube not be too long?

A: If the catheter in the test tube is too long, the drug will block the catheter, affect the gas escape, and even cause the test tube**.

3) After the gas generator is assembled, why should the air tightness of the device be checked?

Answer: If the air tightness of the device is not checked, when the device leaks, the generated gas is difficult to collect, and the purpose of gas production cannot be achieved.

4) Why should the drug be diagonally spread at the bottom of the test tube?

Answer: In order to increase the heating area of the reactants, the generated gas can easily escape from the solid.

5) When heating, why use an alcohol lamp to move back and forth under the test tube, and then fix the external flame on the part where the drug is located?

A: The alcohol lamp moves back and forth to heat the tube evenly and prevent it from bursting. Since the temperature of the outer flame is the highest, it is heated by an external flame in order to make the decomposition reaction easy to occur.

6) Why should the air exhaust method collect oxygen with the bottle mouth upward? And the mouth of the catheter should be extended close to the bottom of the gas collection cylinder?

A: Since oxygen is slightly heavier than air, it is collected by the upward exhaust air method. The purpose of extending the mouth of the catheter to the bottom of the cylinder is to expel the air quickly and the purity of the gas is relatively high.

7) When using potassium permanganate to make oxygen, why is a ball of soft cotton put in the mouth of the test tube?

Answer: The main purpose of putting cotton is to prevent potassium permanganate powder from entering the catheter when heating.

8) Why can't the escaping gas from the catheter be collected prematurely? Answer: Because the gases that start to escape are mainly air.

9) When using the upward exhaust air method to collect oxygen, how to check whether the bottle is full of oxygen?

Answer: Put the wooden strip with sparks on the mouth of the bottle, and if it is rekindled, it will be full.

l0) Why should the catheter be removed from the sink and then the alcohol lamp removed when the oxygen production is stopped?

Answer: Remove the alcohol lamp first, the temperature of the test tube decreases, the gas pressure in the test tube decreases, and the cold water is sucked along the catheter into the hot test tube, so that the test tube ruptures.

Hydrogen storage: Hydrogen is pressurized and placed in a gas tank.

There are laboratory and industrial methods for hydrogen production.

Laboratory method: 1. React with strong acid and active metal, such as Zn+2HCl=ZnCl2+H2

2. React with alkali metal with water, such as 2Na + 2H2O = 2NaOH + H2

Industrial method: the use of electrolysis of saturated brine to produce hydrogen, such as 2NaCl + 2H2O = energized = 2NaOH + Cl2 + H2, but also the method of industrial chlorine production.

In the laboratory, zinc can be used to dilute sulfuric acid, and industrially use water and red-hot carbon to reflect.

Hydrogen storage: Hydrogen is pressurized and placed in a gas tank.

There are laboratory and industrial methods for hydrogen production.

Laboratory method: 1. React with strong acid and active metal, such as Zn+2HCl=ZnCl2+H2

2. Reaction with alkali metal and water, such as 2Na + 2H2O = 2NaOH + H2 Industrial method: the use of electrolysis of saturated brine to produce hydrogen, such as 2NaCl + 2H2O = energized = 2NaOH + Cl2 + H2, which is also a method for industrial chlorine production.

It's in the physics book for the third year of junior high school.

Hydrogen can be produced in several ways:

1.Produced by chemical reaction: Hydrogen is often obtained by reacting with other substances, such as electrolysis of water, combustion reaction, etc.

2.Purification preparation: Hydrogen often exists vertically or in other gases, such as natural gas, coal gas, etc., and hydrogen can be separated from other gases by purification.

3.Preparation by absorption method: Absorbents, such as sodium carbonate, calcium carbonate, etc., can be used to absorb hydrogen into the absorbent, and then heat and evaporate to purify the hydrogen from the absorbent.

By the way, I guess there is a way to produce hydrogen through gasoline reforming.

Gasoline reforming is a process in which the alkyl groups in gasoline are subjected to catalytic cracking reactions to generate aromatic spike bends and hydrogen.

The advantages of this method are that the hydrogen produced is of higher quality, higher purity, and faster production speed, but the disadvantage is that gasoline reforming requires the use of special catalysts, which is relatively costly.

The laboratory produces hydrogen per acre of land.

zn+h2so4=h2↑+znso4

2al+6hcl = 2 alcl3 + 3 h2 zen2al2al+2naoh + 2h2o = 2naalo2 + 3h2

fe+2hcl=fecl2+h2↑

Mg+ 2HCl ==MgCl2 + H2 Resistant 2AL +3H2SO4 = Al2(SO4)3 +3H2 Zn + 2HCl ==ZNcl2 + H2 Fe + H2SO4 = FeSO4 + H2 MG + H2SO4 = MGSO4 + H2

1. High-pressure gaseous storage.

Gaseous hydrogen can be stored in underground silos.

It can also be packed in human cylinders, and hydrogen must be compressed first.

2. Cryogenic liquid hydrogen coexists.

Hydrogen is cooled to -253 to a liquid state, which is then stored in a high-vacuum insulated container.

3 Jindou stove traces belong to hydride storage.

There can be a reversible reaction between hydrogen and hydride metals.

When heat is added to the metal hydride, it decomposes into the hydride metal.

and release hydrogen. Conversely, when hydrogen and hydride metal form hydride, hydrogen is stored in the form of a solid bond.

Electrolysis electrolysis electrolyzes water to produce hydrogen and oxygen. Chlorine and caustic soda are also by-products when chlorine and caustic soda are produced by electrolysis of salt solution in the chlor-alkali industry. Pure hydrogen can be obtained by electrolysis, but the power consumption is very high, and the electricity consumption is up to 1m3 of hydrogen produced.

Chemical equation: 2H2O = energized = 2H2 + O2

Hydrocarbon cracking method The cracking gas obtained by this method contains a large amount of hydrogen, and its content varies depending on the properties of the raw material and the cracking conditions. Cryogenic separation of pyrolysis gas yields hydrogen with a purity of 90, which can be used as industrial hydrogen, such as as raw material for catalytic hydrogenation in petrochemical industry.

Hydrocarbon steam reforming method Hydrocarbons can react with water vapor to produce hydrogen-containing syngas at high temperature and in the presence of a catalyst. In order to obtain pure hydrogen from syngas, molecular sieves can be used to remove other gases by pressure swing adsorption; Pure hydrogen can also be obtained by membrane separation; By adsorbing hydrogen with palladium metal, hydrogen can be separated up to 1,000 times the volume of metal.

Refinery gas Various hydrogen-containing gases produced in the production process of petroleum refineries, such as hydrogen-containing gases produced in the processes of catalytic cracking, catalytic reforming, petroleum coking, etc., and coke oven gas (containing 45 60 hydrogen) can be separated by cryogenic separation to obtain industrial hydrogen with high purity.

Hello! In industry, hydrogen is basically produced by electrolysis of saturated brine.

It only represents a personal opinion, don't spray if you don't like it, thank you.

1. Storage of hydrogen gas mass information: put the hydrogen in the gas storage tank after pressurization.

2. Laboratory method: react with strong acid and active metal, such as Zn+2HCl=ZnCl2+H2; It reacts with water with alkali metal collapse, such as 2Na+2H2O=2NaOH+H2. Frankly not.

3. Industrial method: the use of electrolysis of saturated brine to produce hydrogen, such as 2NaCl + 2H2O = energized = 2NaOH + Cl2 + H2, which is also a method for industrial chlorine production.

Method. 1. Method of reaction between active metal and acid (dilute sulfuric acid or dilute hydrochloric acid). 2. Electrolysis of water.

Method. 3. Water gas method (using carbon and water vapor to react at high temperature to produce hydrogen and carbon monoxide) method. Fourth, the high-efficiency catalyst decomposes water into hydrogen and oxygen at room temperature.

Method. 5. Methane is decomposed into elemental carbon and hydrogen at high temperatures (the elemental carbon produced by decomposition is very useful).

1. Hydrogen production method by electrolysis of water.

Iron as the cathode surface and nickel as the anode surface are mostly used in series electrolytic cells to electrolyze the aqueous solution of caustic potassium or caustic soda. The anode produces oxygen, and the cathode produces hydrogen. This method is costly, but the product purity is large, and hydrogen with more than % purity can be directly produced.

2. Water gas method to hydrogen.

Anthracite or coke is used as raw material to react with water vapor at high temperature to obtain water gas. After the meganucleus is purified, it is converted into carbon dioxide through a catalyst along with water vapor, and a gas with a hydrogen content of more than 80% can be obtained. It is then pressed into water to dissolve carbon dioxide, and the residual carbon monoxide is removed from the cuprous solution containing ammonic acid to obtain purer hydrogen.

This method of late guessing is low in cost and has a large output.

3. Coke oven gas refrigeration to produce hydrogen.

The preliminarily purified coke oven gas is frozen and pressurized to liquefy other gases and leave hydrogen.

4. Hydrogen, by-product of ignition brine.

In the chlor-alkali industry, there is a large amount of pure hydrogen by-products, which is surplus in addition to the synthesis of hydrochloric acid, and can also be purified to produce ordinary hydrogen or pure hydrogen.