2015年4月29日星期三
Zeolite catalyst density analysis
(1) Bulk density Bulk
Test Method This bulk density is in a container, by free-fall section exposed to the air for 24h the bulk density of the sample.
This method takes the instrument may be a simple cylinder for a tap or bulk density of the analyzer.
(2) tapped bulk density
Determination of tapped bulk density of conventional vibration method, using the experimental apparatus shown in ASTM standard specified in FIG. 3-7, the test method is the pretreatment of the catalyst at 400 ℃ 3h in air (reduction catalyst should be in an inert atmosphere be). After cooling, the operation of the vibrator in the measuring device to the second 2 ^ -3m1. rate added through the feed hopper into the measuring cylinder, and then continue the vibration lmin, shutting down the vibrator, amount of catalyst volume and weighed mass, calculated tap bulk density.
Calculated with the formula without standard equipment in the laboratory, can be used in the rubber board 250mL graduated cylinder side edge joined to make a real sample, to be added to complete the sample continues to trample real 2min. This method measured the non-strict measure bulk density.
Test Method This bulk density is in a container, by free-fall section exposed to the air for 24h the bulk density of the sample.
This method takes the instrument may be a simple cylinder for a tap or bulk density of the analyzer.
(2) tapped bulk density
Determination of tapped bulk density of conventional vibration method, using the experimental apparatus shown in ASTM standard specified in FIG. 3-7, the test method is the pretreatment of the catalyst at 400 ℃ 3h in air (reduction catalyst should be in an inert atmosphere be). After cooling, the operation of the vibrator in the measuring device to the second 2 ^ -3m1. rate added through the feed hopper into the measuring cylinder, and then continue the vibration lmin, shutting down the vibrator, amount of catalyst volume and weighed mass, calculated tap bulk density.
Calculated with the formula without standard equipment in the laboratory, can be used in the rubber board 250mL graduated cylinder side edge joined to make a real sample, to be added to complete the sample continues to trample real 2min. This method measured the non-strict measure bulk density.
2015年4月27日星期一
Anti-crush strength of the catalyst and molecular sieve methods
Because of different shape and molecular sieve drying, different stress points, said the crush strength of the ways are different. Usually divided into axial (or normal phase) Crushing strength (N / cm2), radial (or lateral phase) Crushing strength (N / cm) and the point Crushing strength (N /%). Where the former surface contact. The latter two are in line contact and point contact, respectively mouth (axis) ,. (Diameter) and. (Dot) said. Strip, ring, shaped spokes reminder
Agents and molecular sieve xh-7 with radial crush strength is represented by dots and spherical crush strength is expressed.
Catalytic Jing large particle size or carrier, such as Raschig rings, a spherical molecular sieve, the board side of the test method can be used to mean value. Small particle size catalyst, is preferably used stacking strength meter, deep extent stacked on top of a volume of the sample under pressure chipping 'as the catalyst for the fine particles, the average number of single V Hang crush strength of the catalyst is not important. Sometimes probably a few percent of the crushing pressure will cause a surge in the catalyst bed was forced to stop.
Agents and molecular sieve xh-7 with radial crush strength is represented by dots and spherical crush strength is expressed.
Catalytic Jing large particle size or carrier, such as Raschig rings, a spherical molecular sieve, the board side of the test method can be used to mean value. Small particle size catalyst, is preferably used stacking strength meter, deep extent stacked on top of a volume of the sample under pressure chipping 'as the catalyst for the fine particles, the average number of single V Hang crush strength of the catalyst is not important. Sometimes probably a few percent of the crushing pressure will cause a surge in the catalyst bed was forced to stop.
Jing zeolite catalysis and adsorption properties of packaging materials and moisture
Jing and zeolite catalysis is a porous material. Some types of finely powdered products or very fine. Therefore they have a large surface area thereof. The internal surface of the atom atom in a different state, the internal atomic attraction uniformly distributed in the circumferential country atom force field to make the saturation equilibrium, while the surface atoms of this force field is not saturated, That surface adsorption force field exists, there is the surface energy. When the gas or liquid molecules into the force field range, it will be adsorbed, thereby reducing the surface energy by the white system. This unsaturated force field scope. Roughly equivalent to the size of the molecular diameter. That is about a few angstroms. Therefore, they have a very clear its adsorption performance is good adsorption Jing.
Depending on the size of adsorption. Adsorption phenomena generally classified into two types of physical adsorption and chemisorption. Physical adsorption force is van der Waals forces. Therefore, similar to the adsorption heat and condensation heat, and the adsorption is reversible adsorption is fast, a greater speed at low temperatures. Chemisorption between the adsorption and chemisorption Jing success key role. Adsorption heat large (> 10kcal / mol, lea [. A 1840J). And the chemical reaction heat is similar but different chemical adsorption and chemical reaction. No new material is generated. Chemical adsorption is irreversible, and must have a high activation force dish surface can be overcome.
Which adsorb moisture in the air is the most common physical adsorption phenomenon. Such as zeolites have play very absorbent sheets can, even at very low partial pressure or concentration. There is still a very high adsorption capacity bi, so no matter what is used. Can get a good depth of dry operation. Or zeolite 3a molecular sieve for ethanol drying catalyst during the activation. Can not completely remove the moisture contained therein, but also more or less finished product prior to packaging certain adsorbed moisture, the moisture of the total sub-Jing or Automobile Desiccation Molecular Sieve catalyst and a percentage of this substance is said to Lang moisture for most packaged goods, usually expressed as a mass fraction II.
Depending on the size of adsorption. Adsorption phenomena generally classified into two types of physical adsorption and chemisorption. Physical adsorption force is van der Waals forces. Therefore, similar to the adsorption heat and condensation heat, and the adsorption is reversible adsorption is fast, a greater speed at low temperatures. Chemisorption between the adsorption and chemisorption Jing success key role. Adsorption heat large (> 10kcal / mol, lea [. A 1840J). And the chemical reaction heat is similar but different chemical adsorption and chemical reaction. No new material is generated. Chemical adsorption is irreversible, and must have a high activation force dish surface can be overcome.
Which adsorb moisture in the air is the most common physical adsorption phenomenon. Such as zeolites have play very absorbent sheets can, even at very low partial pressure or concentration. There is still a very high adsorption capacity bi, so no matter what is used. Can get a good depth of dry operation. Or zeolite 3a molecular sieve for ethanol drying catalyst during the activation. Can not completely remove the moisture contained therein, but also more or less finished product prior to packaging certain adsorbed moisture, the moisture of the total sub-Jing or Automobile Desiccation Molecular Sieve catalyst and a percentage of this substance is said to Lang moisture for most packaged goods, usually expressed as a mass fraction II.
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