Catalyst for preparing toluene by oxidative dehydrogenation of dimethyl ether, preparation method and application thereof
A technology for oxidative dehydrogenation and catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., which can solve the problems of inability to obtain high-selectivity toluene, raw material naphtha and light diesel resource shortage and limitation, etc. , to achieve the effects of low production cost, high selectivity and simple preparation process
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Embodiment 1
[0022] Weigh 50g of ammonium metatungstate, dissolve it in 10ml of deionized water, add 30g of HZSM-22 molecular sieve, let it stand for 10h, dry overnight at 110°C, and roast in a muffle furnace at 550°C for 6h to obtain WO 3 / HZSM-22 catalyst powder. Then mix the above 7.6g catalyst powder with 0.8g pseudo-boehmite evenly, add 3% (wt) dilute nitric acid, after mixing evenly, dry it at 110°C for 8h, then roast it at 400°C for 4h, and break it to 40-60 mesh, that is, the formed WO 3 / HZSM-22 catalyst, its component weight percentage is: 11.49%WO 3 , 79.56%HZSM-22, 9.52%Al 2 o 3 .
[0023] The above prepared WO 3 / HZSM-22 catalyst is loaded into a fixed-bed reactor, and dimethyl ether and oxygen (n DME :n O2 =1:1), when the reaction pressure is 0.1MPa, the reaction space velocity is 200h -1 , under the condition of the reaction temperature of 290°C, the reaction was carried out for 30 minutes, the conversion rate of dimethyl ether was 98%, and the selectivity of toluene...
Embodiment 2
[0025] Weigh 25g of tetrapropylammonium hydroxide (TPAOH) aqueous solution with a mass concentration of 25% and mix it with 120.5g of deionized water, add 0.55g of sodium metaaluminate to the above solution, stir at a constant temperature of 35°C until clear, add 17.78g of Ethyl silicate (TEOS), add 0.14g sodium hydroxide to the above solution, add 0.67g ferric nitrate nonahydrate and 1.18g cobalt nitrate hexahydrate after the NaOH is dissolved, continue stirring for 4h, transfer to the reaction kettle, and age at 50°C 2h, crystallization at 160°C for 48h. After crystallization, cool to room temperature, filter the reaction mixture with suction, wash the obtained filter cake until the filtrate is neutral, dry at 110°C for 12h, and roast at 550°C for 5h to obtain in-situ modified Fe 2 o 3 -Co 2 o 3 / ZSM-5 molecular sieve.
[0026] 12.6 g Fe 2 o 3 -Co 2 o 3 / ZSM-5 molecular sieve and 0.95g pseudo-boehmite are evenly mixed, dried at 100°C for 10h, then calcined at 500°C ...
Embodiment 3
[0029]Weigh 6.69g of titanium sulfate, 6.43g of ammonium metavanadate, 33.7g of oxalic acid and dissolve it in 75ml of deionized water, add 35g of SAPO-34 molecular sieve, let stand for 10h, dry overnight at 100°C, and roast in a muffle furnace at 550°C for 6h , that is to get TiO 2 / V 2 o 5 / SAPO-34 catalyst powder. Then mix the above 7.6g catalyst powder with 1.2g pseudo-boehmite evenly, add 3% dilute nitric acid, dry it at 110°C for 12h, then roast it at 550°C for 6h, break it to 40-60 mesh, and get Formed TiO 2 / WO 3 / SAPO-34 catalyst, its component weight percentage is: 5.27%TiO 2 , 11.84%V 2 o 5 ,82.88%SAPO-34, 13.64%Al 2 o 3 .
[0030] TiO obtained above 2 / V 2 o 5 / SAPO-34 catalyst is loaded into a fixed-bed reactor, and dimethyl ether and hydrogen peroxide (nDME:nO 2 =1:3), when the reaction pressure is 0.4MPa, the reaction space velocity is 800h -1 , under the condition of reaction temperature 200°C, reacted for 1.5 hours, the conversion rate of dimeth...
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