A method for removing alkyne by hydrogenation before methanol to olefin product
A technology of methanol to olefins and pre-hydrogenation, which is applied in the direction of hydrogenation to hydrocarbons, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve the problem that there is still a long distance for industrial application and unfavorable industrialization application, low conversion rate of acetylene, etc., to achieve the effects of excellent anti-coking performance of the catalyst, moderate reactivity, and low ethylene loss rate
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Embodiment 1
[0093] Weigh a clover-shaped alumina carrier of Φ4.5×4.5 mm. Take ferric nitrate, dissolve it in 60ml of deionized water by heating, adjust the pH value to 2.5, impregnate the equal volume on the surface of the carrier at the temperature of 50°C, flip the carrier quickly for 6 minutes, let it stand still for 30 minutes until the adsorption equilibrium, and age at 60°C for 30 minutes, then in Follow the procedure in the oven: dry the catalyst at room temperature 100°C and 100°C, and then use the temperature programming method to activate the catalyst. Weigh copper nitrate and impregnate according to the above preparation steps. The physical properties of the carrier and catalyst, and the content of each component of the catalyst are shown in Table 2.
[0094] Evaluation method:
[0095] Before the catalyst is used, it is reduced with 40% hydrogen + 60% nitrogen in a reduction furnace, the reduction temperature is 300° C., the pressure is 0.5 MPa, and the reduction time is 4 h...
Embodiment 2
[0101] At 50°C, the NaAlO 2 solution and ZrCl 4 The solution was stirred and mixed, then neutralized with nitric acid solution, stirred for 10 hours, and uniform Al-Zr particles were formed by co-precipitation. The resultant was filtered and the Na in it was washed with deionized water + and Cl - Ions, and then add polyvinyl alcohol with a mass concentration of 15% as a pore-forming agent, kneading and molding. Dry at 130°C for 2h, and calcined at 650°C for 4h to obtain a Zr-Al composite support. The mass ratio of alumina to zirconia in the carrier is 4:1.
[0102] The catalyst was prepared with alumina-zirconia composite carrier. Take ferric chloride and copper chloride, heat and dissolve them in deionized water, adjust the pH value to 2.0, impregnate the excess on the carrier at a temperature of 80°C, shake the beaker for 10 minutes, filter off the excess impregnating liquid, and place the catalyst in a water bath at 60°C Medium aging for 50min, then follow the procedu...
Embodiment 3
[0107] Weigh 100ml of a Φ1.5mm spherical α-alumina carrier. Dissolve ferric nitrate in 40ml of deionized water, adjust the pH value to 3.0, soak the liquid at a temperature of 40°C, spray it on the carrier with a watering can, load it in the drum for 10 minutes to make the active components evenly loaded, and control the loading process in 6 minutes to complete, and then In the oven follow the procedure: Dry the catalyst, move the catalyst into an evaporating dish, and activate the catalyst in a muffle furnace using a temperature-programmed method. The activation procedure: Obtain a catalyst dip.
[0108] Using the same method as the first step, take copper nitrate, dissolve it, spray it on the surface of the catalyst, dry it, and roast it to obtain the final catalyst. Drying procedure: Roasting procedure: The physical properties of the carrier and catalyst, and the content of each component of the catalyst are shown in Table 2.
[0109] Before the catalyst is used,...
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