Catalyst for producing isobutylene by catalyzing butane, and applications thereof
A technology for catalyzing butane and a catalyst, which is applied to a catalyst for catalyzing butane to produce isobutene and its application field, can solve problems such as low isobutene yield, achieve high butane conversion rate and isobutene selectivity, prolong life, and excellent reaction effect Effect
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Embodiment 1
[0051] 139.3g pseudo-boehmite (containing 70wt% Al 2 O 3 ) Add to 800mL deionized water while stirring, then slowly add 264.5g phosphoric acid solution (containing 85wt% phosphoric acid), stir evenly, and then add 45.9g silica sol (containing 25wt% SiO 2 ), then add 96.8 g of di-n-propylamine and 426 mL of deionized water, and stir again evenly. The obtained mixture was transferred to a dynamic autoclave, the stirring speed was set to 350 r / min, the temperature was raised to 130° C., and the temperature was aged for 4 hours. After the aging, the stirring speed was set to 140r / min, the temperature was raised to 200°C, and the crystallization was performed under autogenous pressure for 36 hours. After the crystallization is completed, the crystalline product is filtered, washed, dried at 120°C, and calcined at 540°C for 6 hours to obtain SiO 2 / Al 2 O 3 Molar ratio = 0.2, SAPO-11 molecular sieve sample with uniform particles, relative crystallinity 100%.
[0052] The SAPO-11 molecu...
Embodiment 2
[0057] Weigh 30g of the molded SAPO-11 molecular sieve prepared in Example 1, and immerse it in a 0.60g / ml cobalt sulfate solution for 3 hours by an equal volume immersion method, then dry at 110°C for 3 hours, and calcinate at 450°C for 3.5 Within hours, a Co / SAPO-11 catalyst (catalyst component a) was prepared, containing 16 wt% of Co.
[0058] Separately weigh 30g of the above SAPO-11 molecular sieve, use methyl tert-butyl ether (MTBE) cracking device to remove the heavy components at the bottom of the tower (containing 91% olefins, MTBE4.5%) soaking for 3 hours, and then in a nitrogen atmosphere Dry at 120°C for 3 hours for later use (catalyst component b).
[0059] In a fixed-bed reactor, pure n-butane is used as a raw material for the dehydrogenation and isomerization of n-butane. The upper bed of the reactor is filled with 15g of the above-prepared Co / SAPO-11 catalyst, and the lower bed is filled with 10g of the SAPO-11 molecular sieve catalyst that has been soaked with org...
Embodiment 3
[0061] Weigh 30g of the molded SAPO-11 molecular sieve prepared in Example 1, and immerse it in a 0.2g / ml molybdenum nitrate solution for 3 hours by an equal volume immersion method, then dry at 130°C for 2 hours, and roast at 500°C for 3.5 Within hours, a Mo / SAPO-11 catalyst (catalyst component a) was prepared, and the loading amount of Mo was 14 wt%.
[0062] Separately weigh 30g of the above SAPO-11 molecular sieve, use methyl tert-butyl ether (MTBE) cracking device to remove the heavy components at the bottom of the tower (containing 91% olefins, MTBE4.5%) soaking for 2.5 hours, and then under nitrogen atmosphere Dry at 110°C for 4 hours for later use (catalyst component b).
[0063] In a fixed bed reactor, pure n-butane is used as raw material to carry out the dehydrogenation and isomerization reaction of n-butane. The upper bed of the reactor is filled with 10 g of the Mo / SAPO-11 catalyst prepared as described above, and the lower bed is filled with 15 g of the SAPO-11 molec...
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