Catalysts for the preparation of homoanhydrides
The technology of a catalyst and a homoanhydride is applied in the field of catalysts for preparing homoanhydride, and can solve the problems of high yield of homoanhydride and low yield of homoanhydride, and achieve the effects of improving activity, stability and yield.
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Embodiment 1
[0026] Weigh 91g of oxalic acid and 310ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 6 parts of titanium dioxide and 0.4 parts of zinc nitrate into the solution, and continue to stir evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 74.0%. The evaluation results are shown in Table 1. ...
Embodiment 2
[0028] Weigh 91g of oxalic acid and 310ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 6 parts of titanium dioxide and 0.4 parts of magnesium nitrate into the solution, and continue stirring to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1 Next, it was evaluated in a fixed bed reactor, and the average anhydride yield was measured to be 74.1%. The evaluation results are shown in Table 1.
Embodiment 3
[0033] Weigh 91g of oxalic acid and 310ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 6 parts of zirconium nitrate and 0.4 part of cadmium nitrate into the solution, and continue to stir evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 540°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 510°C and a space velocity of 5200h -1Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 73.9%. The evaluation results are shown in Table 1....
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