A kind of preparation method of synthetic dimethyl oxalate catalyst carrier
A technology for synthesizing dimethyl oxalate and dimethyl oxalate, which is applied in the direction of catalyst carrier, carbon monoxide or formate reaction preparation, chemical instruments and methods, etc., can solve the problem of smaller specific surface area and average pore size, which is not conducive to catalyst activity, It is unfavorable for the dispersion of active components and other problems, and achieves the effect of high crystallinity, high dispersion and good catalytic activity
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Embodiment 1
[0023] Weigh 0.02mol tetra-ortho titanate and dissolve it in glacial acetic acid to form a 0.5mol / L solution. Weigh 0.02mol magnesium nitrate and dissolve it in deionized water to form a 0.4mol / L solution, add it to the prepared tetra-n-butyl titanate acetic acid solution under constant stirring, and add 0.02g cyclodextrin at the same time as porogen. The above mixed solution was placed in a water bath at 80° C. to obtain a transparent gel. The above gel was dried in an oven at 60°C for 12 hours, then raised to 100°C for 12 hours, then transferred to a corundum crucible and calcined at 600°C for 2 hours in a muffle furnace to obtain a blocky white powder. After ball milling the above white powder, add 5mL of 1mol / L polyvinyl alcohol aqueous solution as an adhesive, mix thoroughly and extrude into strips, and finally place it in a muffle furnace at 700°C for 2 hours to obtain MgTiO 3 carrier.
[0024] For the obtained MgTiO 3 For carrier characterization results, see Figu...
Embodiment 2
[0026] Weigh 0.04mol tetraisobutyl titanate and dissolve it in glacial acetic acid to form a 1mol / L solution. Weigh 0.04mol calcium nitrate and dissolve it in deionized water to form a 0.8mol / L solution, add it to the prepared tetraisobutyl titanate acetic acid solution under constant stirring, and add 0.04g cyclodextrin as porogen. The above mixed solution was placed in a water bath at 85° C. to obtain a transparent gel. The above gel was dried in an oven at 70°C for 12 hours, then raised to 110°C for 12 hours, then transferred to a corundum crucible and calcined at 500°C for 4 hours in a muffle furnace to obtain a blocky white powder. After ball milling the above white powder, add 5mL of 1.5mol / L polyvinyl alcohol aqueous solution as an adhesive, mix well and carry out extrusion molding, and finally place it in a muffle furnace at 700°C for 4 hours to obtain CaTiO 3 carrier.
Embodiment 3
[0028] Weigh 0.02mol tetra-n-propyl titanate and dissolve it in glacial acetic acid to form a 0.5mol / L solution. Weigh 0.02mol cobalt nitrate and dissolve it in deionized water to form a 0.4mol / L solution, add it to the acetic acid solution of tetra-n-propyl titanate prepared under constant stirring, and add 0.02g chitosan as porogen. The above mixed solution was placed in a water bath at 75° C. to obtain a transparent gel. The above gel was dried in an oven at 80°C for 12 hours, then raised to 120°C for 12 hours, then transferred to a corundum crucible and baked at 600°C in a muffle furnace for 6 hours to obtain a blocky black powder. After the above-mentioned black powder is ball-milled, 5 mL of 2mol / L polyvinyl alcohol aqueous solution is added as an adhesive, mixed thoroughly, extruded into strips, and finally placed in a muffle furnace at 700°C for 5 hours to obtain the CoTiO of the present invention. 3 carrier.
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