Catalyst for producing olefin through dehydrogenation of pentane or hexane, preparation method and applications thereof
A catalyst and a technology for producing olefins, which are applied in the field of catalysts and preparations for pentane or hexane dehydrogenation to olefins, can solve the problems that cannot be fully utilized, that alkanes cannot be etherified, etc., and achieve good catalytic activity and stability, Effect of increasing stability, good technical effect
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Embodiment 1
[0042] The preparation of embodiment 1 alumina carrier I
[0043] Add 0.5 mol / L sodium hydroxide aqueous solution dropwise to 100 mL 1.0 mol / L aluminum nitrate solution until the pH of the aluminum salt solution is 8, forming a precipitate, and suction filtration and washing until the pH of the filtrate is 7 to obtain aluminum hydroxide Gel, the gel is peptized with 1.0mol / L nitric acid, the amount of acid added is H + / Al=0.25, to obtain a sol, add 15 grams of hexamethylenetetramine, then transfer the sol to a hydrothermal kettle and age it at 140°C for 10 hours, then transfer it to a beaker and dry it at 120°C, and put it in a muffle furnace Calcined at 800°C for 4 hours to obtain calcined alumina carrier I.
Embodiment 2
[0044] Embodiment 2 preparation of alumina carrier II
[0045] Add 1.0 mol / L ammonia solution dropwise to 200 mL 0.5 mol / L aluminum chloride solution until the pH of the aluminum salt solution is 8, forming a precipitate, and suction filtration and washing until the pH of the filtrate is 7 to obtain aluminum hydroxide condensate Gel, the gel is peptized with 0.5mol / L hydrochloric acid, the amount of acid added is H + / Al=0.3, to obtain a sol, add 18 grams of hexamethylenetetramine, then transfer the sol to a hydrothermal kettle and age it at 145°C for 8 hours, then transfer it to a beaker and dry it at 120°C, and put it in a muffle furnace Calcined at 650° C. for 4 hours to obtain calcined alumina carrier II.
Embodiment 3
[0046] Embodiment 3 preparation of alumina carrier III
[0047] Add 2.0 mol / L ammonia solution dropwise to 200 mL 0.5 mol / L aluminum sulfate solution until the pH of the aluminum salt solution is 8, forming a precipitate, and suction filtration and washing until the pH of the filtrate is 7 to obtain aluminum hydroxide gel , the gel is peptized with 0.5mol / L sulfuric acid, and the amount of acid added is H + / Al=0.5, to get a sol, add 32 grams of hexamethylenetetramine, then transfer the sol to a hydrothermal kettle and age it at 130°C for 18 hours, then transfer it to a beaker and dry it at 120°C, and put it in a muffle furnace Calcined at 550° C. for 4 hours to obtain calcined alumina carrier III.
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