CN103386329A - Production process of active carrier of tail gas processing agent for diesel engine - Google Patents

Abstract

The invention relates to an active carrier of a tail gas processing agent and particularly relates to an active carrier of the tail gas processing agent for a diesel engine and a production process of the active carrier. The production process comprises the following steps of: (1) selecting metatitanic acid with the surface area being more than or equal to 250m<2>/g, the grain size D(50) being less than or equal to 2, and the free acid SO4<2-> content being 2-4%; (2) washing the metatitanic acid until the content of Fe2O3 is less than 50ppm; (3) pulping the raw material obtained in the step (2) until the solid content is 25-40%, and simultaneously stirring and adding ammonium paratungstate solution with the concentration of 200-450g/l; (4) stably calcining for 2-5 hours at the temperature of 300-550 DEG C; and (5) crushing to obtain a product with the grain size of 0.8-1.5 microns. By utilizing the technical scheme disclosed by the invention, the lattice of the carrier cannot be changed within 6-10 hours at the temperature of 1000 DEG C, so that the carrier has high catalytic reaction bearing capacity and good temperature endurance and can work for a long time in a severe tail gas environment of the diesel engine.

Description

The production technology of diesel motor exhaust inorganic agent active carrier

Technical field

The present invention relates to a kind of vent gas treatment agent active carrier, be specifically related to a kind of diesel motor exhaust inorganic agent active carrier and production technology thereof.

Background technology

China's motor vehicle in 2012 reaches 2.33 hundred million, and wherein automobile is 1.14 hundred million, 1.03 hundred million, motorcycle.And China's diesel oil vehicle exhaust discharge standard than developed country backward 10 years is controlled exhaust emissions and is protected environment, has become an important job.

Due to the particularity that diesel oil vehicle exhaust is processed, single gas treatment amount is less, and the tail gas flow velocity is fast.This has the catalytic reaction bearing capacity higher than typical catalyst carrier with regard to the carrier that requires the vent gas treatment agent, better reactivity.

Summary of the invention

The technical problem to be solved in the present invention is to provide the production technology of the higher diesel motor exhaust inorganic agent active carrier of a kind of catalytic reaction bearing capacity.

To achieve these goals, the invention provides a kind of production technology of diesel motor exhaust inorganic agent active carrier, include following steps:

1) prepare the raw material metatitanic acid: its specific area is more than or equal to 250 m ²/ g, particle diameter D ₍₅₀₎Less than or equal to 2, free acid SO ₄ ^2-Content 2～4%;

2) metatitanic acid is handled as follows: at first with leaf filter, award after material and hang in sink and carry out once washing, to Fe ₂O ₃Content is less than 250ppm, then bleaches, and makes the high ferro that does not wash away in metatitanic acid change ferrous iron into, then by diaphragm filter press, carries out secondary washing, to Fe ₂O ₃Content is less than 50ppm;

3) raw material that step 2 is obtained is 25～40% with the ionized water solid content of pulling an oar, and stirs simultaneously the secondary tungsten acid ammonium solution that adds 200～450g/l, and the amount that ammonium paratungstate adds need guarantee WO in finished product ₃Content is 10～11%, can draw according to the material calculation of total;

4) material that step 3 is obtained enters rotary kiln with fluid form from the kiln tail and calcines, and from the kiln hood uniform discharge, combustor is placed in the kiln hood stable heating, guarantees that the thermograde in rotary kiln is consistent, and calcination time is 2～5h, and temperature is 300～550 ℃;

5) crushing material that calcining is obtained is the product of 0.8～1.5um to particle diameter, and index is specific area 95～115m ²/ g, total SO ₄ ^2-Content 2～4%, WO ₃Content 10～11%, Fe ₂O ₃Content is less than 100ppm, k ₂O content is less than 100ppm, Na ₂O content is less than 100ppm.

adopt the production technology of the diesel motor exhaust inorganic agent active carrier of technique scheme to have following advantage: in step 3, the making beating solid content is 25～40%, be conducive to the saving of water resource and the energy, the amount of ammonium paratungstate and add mode, make the stabilized metal of product, the cohesion moulding is easier, in step 5, the time of material calcining is shorter, be conducive to energy savings, product can be at 1000 ℃, lattice variations does not occur in 6～10h in the time, and the diesel motor exhaust temperature approximately 500～600 ℃ well below product lattice variations temperature, therefore product has greater catalytic reaction bearing capacity, temperature tolerance preferably, can work long hours in the environment of condition sternness.

The specific embodiment

Embodiment 1

1) prepare the raw material metatitanic acid: its specific area equals 250 m ²/ g, particle diameter D ₍₅₀₎Equal 2, free acid SO ₄ ^2-Content 2～4%;

2) metatitanic acid is handled as follows: at first with leaf filter, award after material and hang in sink and carry out once washing, to Fe ₂O ₃Content is less than 250ppm, then bleaches, and makes the high ferro that does not wash away in metatitanic acid change ferrous iron into, then by diaphragm filter press, carries out secondary washing, to Fe ₂O ₃Content is less than 50ppm;

3) raw material that step 2 is obtained is 25～40% with the ionized water solid content of pulling an oar, and stirs simultaneously the secondary tungsten acid ammonium solution that adds 450g/l, and the amount that ammonium paratungstate adds need guarantee WO in finished product ₃Content is 10～11%, can draw according to the material calculation of total;

4) material that step 3 is obtained enters rotary kiln with fluid form from the kiln tail and calcines, and from the kiln hood uniform discharge, combustor is placed in the kiln hood stable heating, guarantees that the thermograde in rotary kiln is consistent, and calcination time is 5h, and temperature is 550 ℃;

5) crushing material that calcining is obtained is the product of 0.8～1.5um to particle diameter, and index is specific area 95～115m ²/ g, total SO ₄ ^2-Content 2～4%, WO ₃Content 10～11%, Fe ₂O ₃Content is less than 100ppm, k ₂O content is less than 100ppm, Na ₂O content is less than 100ppm.

The product that step 6 obtains can be at 1000 ℃, and lattice variations did not occur in the time 6～10h, and the diesel motor exhaust temperature approximately 500～600 ℃ well below product lattice variations temperature, so this product has greater catalytic reaction bearing capacity.

Following table is product is calcined under 1000 ℃ before and after, the situation of change of BET:

Calcination time	BET m 2/g
		Not calcining	67.34
6h	66.14
		7h	66.08
8h	66.01
		9h	65.90
10h	65.76

Embodiment 2

1) prepare the raw material metatitanic acid: its specific area is greater than 250 m ²/ g, particle diameter D ₍₅₀₎Less than 2, free acid SO ₄ ^2-Content 4%;

2) metatitanic acid is handled as follows: at first with leaf filter, award after material and hang in sink and carry out once washing, to Fe ₂O ₃Content is less than 250ppm, then bleaches, and makes the high ferro that does not wash away in metatitanic acid change ferrous iron into, then by diaphragm filter press, carries out secondary washing, to Fe ₂O ₃Content is less than 50ppm;

3) raw material that step 2 is obtained is 25% with the ionized water solid content of pulling an oar, and stirs simultaneously the secondary tungsten acid ammonium solution that adds 200g/l, and the amount that ammonium paratungstate adds need guarantee WO in finished product ₃Content is 10～11%, can draw according to the material calculation of total;

4) material that step 3 is obtained enters rotary kiln with fluid form from the kiln tail and calcines, and from the kiln hood uniform discharge, combustor is placed in the kiln hood stable heating, guarantees that the thermograde in rotary kiln is consistent, and calcination time is 2h, and temperature is 300 ℃;

5) crushing material that calcining is obtained is the product of 0.8～1.5um to particle diameter, and index is specific area 95～115m ²/ g, total SO ₄ ^2-Content 2～4%, WO ₃Content 10～11%, Fe ₂O ₃Content is less than 100ppm, k ₂O content is less than 100ppm, Na ₂O content is less than 100ppm.

Following table is product is calcined under 1000 ℃ before and after, the situation of change of BET:

Calcination time	BET m 2/g
		Not calcining	65.21
6h	64.14
		7h	64.08
8h	63.94
		9h	63.81
10h	63.57

Embodiment 3

1) prepare the raw material metatitanic acid: its specific area is more than or equal to 250 m ²/ g, particle diameter D ₍₅₀₎Less than or equal to 2, free acid SO ₄ ^2-Content 2%;

2) metatitanic acid is handled as follows: at first with leaf filter, award after material and hang in sink and carry out once washing, to Fe ₂O ₃Content is less than 250ppm, then bleaches, and makes the high ferro that does not wash away in metatitanic acid change ferrous iron into, then by diaphragm filter press, carries out secondary washing, to Fe ₂O ₃Content is less than 40ppm;

3) raw material that step 2 is obtained is 35% with the ionized water solid content of pulling an oar, and stirs simultaneously the secondary tungsten acid ammonium solution that adds 350g/l, and the amount that ammonium paratungstate adds need guarantee WO in finished product ₃Content is 10～11%, can draw according to the material calculation of total;

4) material that step 3 is obtained enters rotary kiln with fluid form from the kiln tail and calcines, and from the kiln hood uniform discharge, combustor is placed in the kiln hood stable heating, guarantees that the thermograde in rotary kiln is consistent, and calcination time is 2～5h, and temperature is 300～550 ℃;

5) crushing material that calcining is obtained is the product of 0.9um to particle diameter, and index is specific area 95～115m ²/ g, total SO ₄ ^2-Content 2～4%, WO ₃Content 10～11%, Fe ₂O ₃Content is less than 100ppm, k ₂O content is less than 100ppm, Na ₂O content is less than 100ppm.

Following table is product is calcined under 1000 ℃ before and after, the situation of change of BET:

Calcination time	BET m 2/g
		Not calcining	65.86
6h	64.45
		7h	64.36
8h	64.19
		9h	64.01
10h	63.87

Above-described is only part preferred embodiment of the present invention; should be pointed out that for a person skilled in the art, under the prerequisite that does not break away from component of the present invention, proportioning and technological parameter; can also make some improvement, these also should be considered as protection scope of the present invention.

Claims (1)

1. the production technology of a diesel motor exhaust inorganic agent active carrier is characterized in that including following steps:

1) prepare the raw material metatitanic acid: its specific area is more than or equal to 250 m ²/ g, particle diameter D ₍₅₀₎Less than or equal to 2, free acid SO ₄ ^2-Content 2～4%;

2) metatitanic acid is handled as follows: at first with leaf filter, award after material and hang in sink and carry out once washing, to Fe ₂O ₃Content is less than 250ppm, then bleaches, and makes the high ferro that does not wash away in metatitanic acid change ferrous iron into, then by diaphragm filter press, carries out secondary washing, to Fe ₂O ₃Content is less than 50ppm;

3) raw material that step 2 is obtained is 25～40% with the ionized water solid content of pulling an oar, and stirs simultaneously the secondary tungsten acid ammonium solution that adds 200～450g/l, guarantees WO in finished product ₃Content is 10～11%;

4) material that step 3 is obtained enters rotary kiln with fluid form from the kiln tail and calcines, and from the kiln hood uniform discharge, combustor is placed in the kiln hood stable heating, guarantees that the thermograde in rotary kiln is consistent, and calcination time is 2～5h, and temperature is 300～550 ℃;

5) crushing material that calcining is obtained is the product of 0.8～1.5um to particle diameter, and index is specific area 95～115m ²/ g, total SO ₄ ^2-Content 2～4%, WO ₃Content 10～11%, Fe ₂O ₃Content is less than 100ppm, k ₂O content is less than 100ppm, Na ₂O content is less than 100ppm.