Layered catalyst composition and process for preparating and using the composition
A composition and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, including molecular sieve catalysts, etc., can solve problems such as difficulty in controlling uniformity
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Embodiment 1
[0061] Alumina spheres were prepared using the well-known oil bath drop method described in US-A-2,620,314, which is incorporated herein by reference. The method includes forming an aluminum sol by dissolving aluminum in hydrochloric acid. Hexamethylenetetramine was added to the sol so that the sol gelled into a spherical shape when dispersed as droplets in an oil bath maintained at 93°C. The droplets were kept in the oil bath until they solidified to form hydrogel spheres. After the balls were removed from the hot oil, they were pressure-aged at 135°C, washed with dilute ammonium hydroxide solution, dried at 110°C and calcined at 650°C for about 2 hours to obtain γ-alumina balls. At this time, the calcined alumina is crushed into fine powder with a particle size of 200 microns or less.
[0062] Then, by adding 258 g of aluminum sol (20 wt % Al 2 O 3 ) and 6.5 g of a 50% aqueous solution of tin chloride and 464 g of deionized water and stirred to uniformly disperse the tin...
Embodiment 2
[0066] The procedure of Example 1 was repeated except that: a slurry was prepared by mixing 275 g of alumina sol into 431 g of deionized water with sufficient stirring, followed by addition of 289 g of gamma-alumina powder and using 5.36 g of tin chloride in 50% water solution , and after granulation and coating, the outer layer thickness of the layered spherical support was 99 μm. After coating, 248 g of slurry remained. Elemental analysis (wt % based on the entire catalyst) indicated that the catalyst contained 0.09 wt % platinum, 0.09 wt % tin and 0.23 wt % lithium. This catalyst is designated Catalyst B. Analysis of Catalyst B by EPMA showed that the platinum was only uniformly distributed throughout the outer layer.
Embodiment 3
[0072] A gamma-alumina slurry (1000 g) was prepared as in Example 1, except that no tin chloride was added to the slurry. This slurry was coated on 1000 g of alpha-alumina cores having a diameter of 1.054 mm as in Example 1 and calcined as in Example 1, resulting in a layered support with an outer layer of gamma-alumina with a thickness of 74 microns.
[0073] By diluting 50% tin chloride solution (Sn content: 0.144 g based on metal) and nitric acid (HNO) with deionized water 3 Content: 18.2 g) to a volume of 150 ml to obtain an aqueous solution, the above support (202 g) was brought into contact with the above aqueous solution, the mixture was dried in a rotary evaporator at a temperature of 150 °C for 2 hours, followed by calcination at a temperature of 615 °C 4 hours.
[0074] At this point, the tin-containing layered composition described in the previous paragraph was contacted with an aqueous solution containing chloroplatinic acid (Pt = 0.188 g), lithium nitrate (Li = 0...
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