A kind of gasoline octane number enhancer and preparation method thereof
A gasoline octane number and enhancer technology, applied in the field of gasoline additives, can solve the problems of high cost and poor effect
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Embodiment 1
[0044] With silicon aluminum (SiO 2 :Al 2 o 3 , mol) ratio of 60 NaZSM-5 powder X to prepare powdery HZSM-5 molecular sieve, and prepare powdery Pt / HZSM-5 molecular sieve catalyst by the following method:
[0045] (1) The Na-type molecular sieve powder X is mixed with 1mol / L NH 4 NO 3 The solution was exchanged 5 times at 80°C, washed with water, dried, calcined at 450°C, and converted into H-type molecular sieves;
[0046] (2) Weigh 50 g of H-type molecular sieve prepared in step (1), add 200 ml of tetraammine platinum nitrate (II)-2m% ammonia solution containing 163 mg / L of platinum, and immerse for 8 hours. Stir once every 10 minutes for 2 hours before immersion. Stir once every hour, filter with suction, add 80ml of water to the funnel each time, soak for 5min and then filter with suction, wash 4 times in total; the collected filtrate and washing liquid are combined to a total of 310ml; dilute the filter cake on a glass watch glass, and place it in an oven at 120°C Dr...
Embodiment 2
[0051] Substantially repeat the steps (2)-(3) of Example 1 to prepare the Pt / HZSM-5 molecular sieve catalyst of loaded metallic platinum, the difference is that step (2) adds tetraammine platinum (II)-2m% ammonia solution Containing platinum 260mg / L, immersion time 12h, step (3) is treated at 300°C and flowing dry nitrogen flow.
[0052] Step (2) The platinum exchange rate in the catalyst preparation process is 93%, and the platinum content of the prepared powdery Pt / HZSM-5 molecular sieve catalyst is calculated to be 0.096m%.
Embodiment 3
[0054] Substantially repeat the steps (2)-(3) of Example 1 to prepare the Pt / HZSM-5 molecular sieve catalyst of loaded metal state platinum, the difference is that directly adopt powdery HZSM-5 molecular sieve Y as raw material, silicon aluminum (SiO 2 :Al 2 o 3 , mol) ratio of 120; SEM photos show that the crystal grains are strip-shaped, the crystals are complete, the overall size is 1-3 μm, and there is no microcrystalline aggregate. The SEM statistical software measures that the number of crystal grains of 0.8-5 μm accounts for the total number of crystal grains. 98.1%, less than 0.5% below 0.5μm; XRD measurement crystallinity 95%; low temperature nitrogen adsorption method specific surface area 360m 2 / g; the specific surface area of pores with a diameter of 10nm or more measured by mercury intrusion porosimetry is 0.77m 2 / g, as the specific surface area of the outer surface of molecular sieve grains.
[0055] The tetraammine platinum (II) nitrate-2m% ammonia solu...
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