Automobile fuels generally do not contain nitrogen, how is nitric oxide produced in exhaust gases?

The big brother upstairs is unprofessional, ah,——

I'll tell you :

Cars need to be inhaled in a lot of air when they burn, and it is known that at least 70% of the air is nitrogen. This is a good explanation for the fact that because the cylinder is not completely burned, a large amount of nitric oxide and other nitrogen oxides are produced.

So, only professionals who have studied chemistry and auto repair can be so good, o( o haha.

Uh, that's too high-profile——!

Car exhaust. nitric oxide.

It is a thermodynamic NOx. Nitrogen oxides formed by the reaction of nitrogen and oxygen in the air at temperatures above 1500.

It is a thermodynamic NOX. This nitrogen oxide is only formed at high temperatures, so it is often referred to as thermal NOx

There are three ways to generate NOX:

Thermodynamic NOx, which refers to the oxidation of nitrogen in the air at high temperatures to form NOX;

Fuel-type NOx refers to the thermal decomposition of nitrogen-containing compounds in the fuel during combustion, and then further oxidation to form NOX;

Rapid NOx refers to the reaction of nitrogen in the air and hydrocarbon ion clusters in fuel such as CH to form NOx during combustion.

In these three forms, there is almost no thermodynamic NOx at temperatures below 1300; Rapid NOx accounts for less than 5%; For conventional coal-fired boilers, NOx is mainly generated through the fuel-type generation pathway.

High school law of conservation of chemical elements: the type and mass of elements are unchanged before and after a chemical reaction. There are many elements in automobile fuel, and we hope that there are three main elements: carbon, hydrogen, and oxygen.

However, it also contains small amounts of nitrogen and sulfur. Fuel cleanliness can only be improved through advanced petroleum refining technology.

Reason: Nitric oxide is generated by incomplete combustion and nitric oxide when the exhaust gas is discharged and in contact with the air (the air mainly contains nitrogen).

Automobile exhaust gas is the exhaust gas produced by automobiles when they are used, containing hundreds of different compounds, including solid suspended particulates, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides, lead and Biqing sulfur oxides.

Nitric oxide (NO) and nitrogen dioxide (NO2) are the main harmful gases in automobile exhaust, and they have serious effects on human health and the environment. In order to reduce their pollution to the environment, they can be treated from the following aspects:

1.Emission standards: Stricter emission standards are being set to require automakers to adopt more environmentally friendly technologies and materials in vehicle production to reduce harmful emissions from tailgases.

2.Automobile exhaust purification technology: advanced automobile exhaust purification technology, such as catalytic converter, regenerative particle trap, etc., will turn the harmful substances in the exhaust into harmless substances and reduce environmental pollution.

3.Traffic management: Strengthen traffic management, reduce traffic congestion and traffic congestion, and reduce vehicle emissions.

4.Use of clean energy vehicles: Promote the use of clean energy vehicles, such as electric vehicles and hydrogen fuel vehicles, to reduce harmful emissions from exhaust gases.

5.Citizens' awareness of environmental protection: Strengthen the publicity of citizens' awareness of environmental protection, encourage citizens to choose environmentally friendly travel methods, such as walking, cycling, public transportation, etc., to reduce the use of vehicles and reduce tailpipe emissions.

To sum up, the environmental pollution of nitric oxide and nitrogen dioxide in automobile exhaust can be effectively reduced by formulating stricter emission standards, adopting automobile exhaust purification technology that collapses first, strengthening traffic management, promoting the use of clean energy vehicles, and strengthening public awareness of environmental protection.

(1) Under the action of BAI catalyst, DU

Carbon monoxide reacts with nitric oxide to produce nitrogen.

Zhi gas DAO and carbon dioxide, the square return formula of the reaction is 2NO+2CO catalyst. 2co2+n2．

2) Re-enter excess air to completely oxidize the remaining carbon monoxide to produce carbon dioxide, and the equation of this reaction is 2CO+O2

Ignite2co2．

Therefore, the answer is: (1) 2NO+2CO catalyst.

2co2+n2；（2）2co+o2

Ignite2co2．

A motor vehicle in the driving hydrocarbons incomplete combustion, carbon monoxide and even black smoke, vehicle exhaust emissions of nitrogen oxides in the high temperature oxygen rich environment in the automobile engine cylinder nitrogen and oxygen reaction, not gasoline incomplete combustion caused, so a wrong;

b Rhizobia of leguminous crops converts nitrogen-containing compounds into proteins, which is the conversion between nitrogen compounds, not nitrogen fixation, so b is wrong;

c Silica has good light conductivity, so it is used to manufacture communication optical cables, which has nothing to do with the strength of electrical conductivity, so C is wrong;

d Olefins contain carbon-carbon double bonds, which can be oxidized into carbon dioxide by acidic potassium permanganate solution, acetaldehyde has an aldehyde group that can be oxidized into a carboxyl group by acidic potassium permanganate solution, and ethanol can undergo redox reaction with acidic potassium permanganate solution to form acetic acid, they can all fade the acidic potassium permanganate solution, so d is correct;

Therefore, choose D

The answer is A

Answer analysis] test question analysis: nitric oxide is insoluble in water and can be collected by drainage; Nitrogen dust in the air can react rapidly with oxygen to form reddish-brown nitrogen dioxide gas, which cannot be collected by the upward air exhaust method. Therefore, the senders choose A.

Test Center: Gas collection method.

The analysis is as follows:

A gasoline engine is ignited with a spark plug, which is to pass in air and then ignite with a spark plug to burn the fuel.

The air contains nitrogen, the spark plug discharges and ignition, and the fuel emits a lot of heat when it is burned, which will promote this reaction.

N2+O2== High temperature or discharge ==2NO

That's how nitric oxide in car exhaust comes from.

A test question analysis: the selection of common gas collection methods is based on: insoluble in water or not easily soluble in water is collected by drainage method, the density is greater than air and does not react with the components in the air, collected by the upward exhaust air method, the density is smaller than the air and does not react with the components in the air, and the downward exhaust air method is used.

Because nitric oxide is insoluble in water, it can be collected by drainage, and because nitric oxide is slightly denser than air, it can react with oxygen in air to quickly produce reddish-brown nitrogen dioxide gas (NO2, so it cannot be collected by exhaust method).

Comments: The choice of gas collection method should be considered according to the density and solubility of the gas, as long as it can react with the components in the air or the density of the gas is very small from the density of the air, it cannot be collected by the exhaust method.

B test question analysis: From the meaning of the question, it can be seen that the equation for changing the chemical reaction can be written as: 2<>4CO<>

<> there are three kinds of oxides; The mass ratio of C and D is 4 44:28=44:7; The ratio of the number of molecules of A and B is 1:2; The butylene molecule is a nitrogen molecule. Pick B.

Comments: According to the chemical equation, we can get the mass ratio of substances and the ratio of the number of molecules in the chemical reaction, and we can also calculate the mass of each substance according to the chemical equation.