Zeolite bound catalyst containing at least three different zeolites, and use for hydrocarbon conversion
A technology for zeolite catalyst and hydrocarbon conversion, which is applied in catalyst activation/preparation, catalytic cracking, molecular sieve catalyst, etc., and can solve problems such as the decline of adsorption performance of zeolite agglomerates, the reduction of zeolite effectiveness, and the slowing of mass rate.
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Embodiment 2
[0119] Preparation of zeolite-bound zeolites.
[0120] ingredients used in preparation
Quantity (grams)
Group No.
Silica bonded ZSM-5 / ZSM-22
5.00
1
NaOH balls
0.09
2
0.77
3
water
9.42
4
[0121] Dissolve components 2 and 3 in component 4 and stir until a clear solution is obtained. The template used in the transformation, tert-butylammonium bromide, was specifically chosen in order to transform the amorphous silica into the MEL structure type. Component 1 was then added to the solution. Then the synthesis mixture was placed in a stainless steel autoclave and heated at 150° C. for 20 hours (heating time was 2 hours). The molar composition of the synthesis mixture is:
[0122] 0.47 Na 2 O / 0.95TBABr / 10SiO 2 / 209.5H 2 o
[0123] The extrudates were washed 5 times in 300 ml of water until the last wash had a conductivity of less tha...
Embodiment 3
[0129] A zeolite-bound zeolite prepared as in Example 1 was used for toluene disproportionation.
[0130]1 gram of zeolite-bound zeolite was mixed with 1 gram of 80-100 mesh ultrapure quartz sand before loading into the stainless steel reactor. The catalyst was pretreated with hydrogen at 500°C for 2 hours, followed by co-feeding with toluene and hydrogen. The total pressure of the reaction was controlled at 45 psig. The partial pressure of the toluene feed was 5.4 psig and the partial pressure of hydrogen was 54 psig. The toluene flow rate was 36.7 mmol / h. The hydrogen flow was controlled with a Brook mass flow controller and the toluene feed was pumped by a high pressure liquid pump. The experiments were performed in a differential state so that the reaction rate could be measured. All products were analyzed by on-line HP6890GC gas chromatography, equipped with Chirasil DEX CP and DBI columns.
Embodiment 4
[0132] To compare the performance of zeolite-bound zeolite catalysts, HZSM-5 catalyst and HZSM-22 catalyst were used for toluene disproportionation, respectively. The HZSM-5 catalyst has a silica / alumina molar ratio of 34 and contains crystals with a particle size of 0.2-1.0 microns. The HZSM-22 catalyst has a silica / alumina molar ratio of 63 and contains crystals with an average length of 1 micron. The test was carried out as described in Example 2, except that each catalyst was mixed with 2.5 grams of 80-100 mesh ultrapure quartz sand prior to loading into the stainless steel reactor to improve feed-catalyst contact.
[0133] image 3 The graph compares the reaction rate as a function of temperature for the zeolite-bound zeolite catalyst, the HZSM-5 catalyst, and the HZSM-22 catalyst, showing a comparison of the performance of the three catalysts. It is clear from the figure that the zeolite-bound zeolite catalyst is about 10 times more active than the HZSM-22 and HZSM-5 c...
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Abstract
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