Catalyst used for production of isobutene via isomerization of n-butene skeleton and combined production of propylene, and preparation method and applications thereof
A catalyst, n-butene technology, applied in the direction of isomerization hydrocarbon production, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problem of low single-pass utilization rate of n-butene
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Embodiment 1～3
[0018] Preparation of sodium potassium hydrogen type FER molecular sieve.
[0019] Ferrerite molecular sieves and NH with different concentrations of ammonium ions 4 Mix the Cl aqueous solution evenly and make a slurry, change the mass ratio of the ferrerite molecular sieve solid to the exchange liquid, stir at different temperatures for 2 hours, filter, and thoroughly rinse the obtained filter cake with deionized water 30 times the dry basis weight of the ferrerite molecular sieve, and dry it at 110°C Calcined at 550°C to obtain sodium potassium hydrogen type FER molecular sieves, which are marked as NaKH-1, NaKH-2 and NaKH-3 respectively. In percent by weight, adopt X-ray fluorescence spectrometry to measure the Na of the sodium potassium hydrogen type FER molecular sieve that makes. 2 O and K 2 O content. Preparation conditions and measured Na of sodium potassium hydrogen type FER molecular sieve 2 O and K 2 The O content is shown in Table 1.
[0020] Table 1 Preparat...
Embodiment 4
[0024] HZSM-5 molecular sieve preparation.
[0025] In the high-pressure hydrothermal synthesis kettle, add 1 part of sodium hydroxide, 1.5 parts of aluminum sulfate, 1.8 parts of tetrapropylammonium hydroxide, 30 parts of silica sol (containing 26% by weight of SiO 2 ) and 40 parts of water, stirred evenly, crystallized at 180°C for 72 hours, filtered and washed, dried at 110°C, roasted at 550°C for 6 hours in a nitrogen atmosphere, and then roasted in an air atmosphere at 550°C for 6 hours to prepare Get the original powder of ZSM-5. 200 g of ZSM-5 molecular sieves, 214 g of NH 4 Cl and 4000 g of deionized water were mixed evenly for beating, stirred at 75°C for 2 hours, filtered, and the above exchange process was repeated 3-5 times at 75°C, and filtered after the exchange, the obtained filter cake was used 30 times as much as ZSM-5 The molecular sieve was thoroughly rinsed with deionized water on a dry basis, dried at 110°C and calcined at 550°C to obtain a hydrogen-type...
Embodiment 5～8
[0027] Catalyst preparation.
[0028]After dry mixing the NaKH-FER molecular sieve powder prepared in Examples 1-3 and the HZSM-5 molecular sieve powder prepared in Example 4, mixed molecular sieves with different weight ratios of NaKH-FER / HZSM-5 were prepared. Palladium chloride-hydrochloric acid solution was used to impregnate the mixed molecular sieve powder with equal volume, impregnated at room temperature for 8 hours, then dried at 110°C for 24 hours, and then roasted at 550°C for 5 hours to finally obtain palladium-containing mixed molecular sieves with different palladium contents. Then knead the prepared palladium-containing mixed molecular sieve with SW-17 aluminum hydroxide powder, scallop powder, nitric acid and deionized water in a CD4X1TS multifunctional catalyst molding machine to form a thick paste, which is molded by a stainless steel with 1.5 mm holes Board extrusion. The obtained extrudates were first dried at room temperature for 24 hours, then dried at 11...
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