Preparation method of double-effect catalyst for highly selective oxidation of methanol to dimethoxymethane
A dimethoxymethane, high-selectivity technology, applied in the preparation of organic compounds, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of catalyst reactivity and selectivity reduction, acid center easy loss of catalytic activity , selectivity reduction and other issues, to achieve the effect of stable activity, not easy to lose, and good dispersibility
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Embodiment 1
[0026] Weigh 1g oxalic acid H 2 C 2 o 4 2H 2 O solid and 1 g potassium sulfate K 2 SO 4 , dissolved in 20 g ethanol-distilled water solution, the mass concentration of ethanol in distilled water is 5%, after stirring to dissolve the solid, add 0.5 g ammonium metavanadate NH 4 VO 3 , stirring to make NH 4 VO 3 completely dissolved, the resulting solution was mixed with 10 g of calcined TiO 2 The powders were mixed, stirred evenly at room temperature, and then allowed to stand for 1 h, then transferred to a reactor with a polytetrafluoroethylene substrate and treated at 80 °C for 12 h. After the treatment, the reaction kettle was taken out, cooled naturally in the air, the precipitate in the reaction kettle was filtered, washed with ethanol for 3 times, then washed with water for 3 times, and then vacuum-dried at 40 °C for 18 h to obtain a powder; the dried powder was dried at 400 Calcined at ℃ for 8 h to obtain SO 4 2- Modified TiO 2 load V 2 o 5 solid catalyst. ...
Embodiment 2
[0028] Weigh 1g oxalic acid H 2 C 2 o 4 2H 2 O solid and 2.5 g sodium sulfate Na 2 SO 4 , dissolved in 10 g ethanol-distilled water solution, the mass concentration of ethanol in distilled water is 25%, after stirring to dissolve the solid, add 1 g ammonium metavanadate NH 4 VO 3 , stirring to make NH 4 VO 3 completely dissolved, the resulting solution was mixed with 4 g of calcined TiO 2 The powders were mixed, stirred evenly at room temperature, and then allowed to stand for 12 h, then transferred to a reactor with a polytetrafluoroethylene substrate and treated at 140 °C for 4 h. After the treatment, take out the reaction kettle, cool it naturally in the air, filter the precipitate in the reaction kettle, wash with ethanol for 3 times, then wash with water for 3 times, then vacuum dry at 80 °C for 4 hours to obtain a powder; dry the obtained powder at 600 °C Roasted for 3 h to obtain SO 4 2- Modified TiO 2 load V 2 o 5 solid catalyst.
Embodiment 3
[0030] Weigh 0.3 g oxalic acid H 2 C 2 o 4 2H 2 O solid and 2.5 g magnesium sulfate MgSO 4 , dissolved in a solution of 5 g ethanol-distilled water, the mass concentration of ethanol in distilled water is 45%, after stirring to dissolve the solid, add 0.25 g ammonium metavanadate NH to the solution 4 VO 3 , stirring to make NH 4 VO 3 completely dissolved, the resulting solution was mixed with 5 g of calcined TiO 2 The powders were mixed, stirred evenly at room temperature, and then allowed to stand for 6 h, then transferred to a reactor with a Teflon substrate and treated at 100 °C for 7 h. After the treatment, take out the reaction kettle, cool it naturally in the air, filter the precipitate in the reaction kettle, wash it with ethanol for 3 times, then wash it with water for 3 times, and then vacuum-dry it at 60°C for 10 hours to obtain a powder; put the dried powder at 500°C Calcined for 4.5 h to obtain SO 4 2- Modified TiO 2 load V 2 o 5 solid catalyst.
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