Boron-containing multi-metallic oxide catalyst and preparation method thereof
A multi-metal oxide and catalyst technology, applied in the preparation of organic compounds, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor thermal stability, inconsistency, deactivation, etc., and achieve high catalyst activity, Good selectivity and stable performance
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Embodiment 1
[0022] 1. Preparation of catalyst
[0023] Weigh 3.54 g of ammonium molybdate and 0.82 g of ammonium metavanadate and add them into 50 ml of deionized water to dissolve them to obtain solution A, weigh 0.72 g of tellurium dioxide and add them to 15 ml of 30% hydrogen peroxide solution to obtain solution B Take by weighing 1.23 g niobium hydroxide and dissolve in the oxalic acid solution, make solution C, take by weighing 0.23 g boric acid and dissolve in 10ml deionized water, get solution D, solution A and solution B are mixed, in constant temperature magnetic stirrer 70 Stir for 30 min at °C. Then, add solution C and solution D into the mixed solution, and after mixing evenly, use dilute nitric acid with a mass fraction of 6% to control the pH=2 of the solution, and then further stir at a temperature of 90 °C for 2 h to obtain a catalyst mother liquor, which is passed through Freeze-drying at -25 °C, thawing at 3-7 °C, and then in a drying oven at 80 °C for 24 h to obtain th...
Embodiment 2
[0029] According to the ratio of the first four active components in Example 1, the molybdenum vanadium tellurium niobium compound precursor was prepared, and then it was immersed in an aqueous solution containing 0.23 g of boric acid for 8 h, and then vacuum-dried at a temperature of 80 ℃, and the drying time was 12 h to obtain the catalyst precursor. The catalyst precursor was roasted, and the temperature was first raised to 300 °C at a rate of 10 °C / min in a nitrogen atmosphere, and kept for 2 h; then the temperature was raised to 600 °C at a rate of 10 °C / min. Insulate for 2 h, and obtain the finished catalyst after roasting.
[0030] The catalyst activity test is the same as in Example 1, and the reaction results are shown in Table 1.
Embodiment 3
[0032] The tellurium source in Example 1 was prepared by using 0.90 g of telluric acid to prepare solution B, and the active components were mixed to obtain a catalyst mother liquor. The catalyst mother liquor was vacuum-dried and kept in a vacuum oven at a temperature of 90 °C for 12 h to obtain a catalyst Precursors and catalyst precursors were roasted, and in an argon atmosphere, the temperature was first raised to 300°C at a rate of 15°C / min, and kept at a temperature of 1 to 4 hours; The finished catalyst is obtained after roasting.
[0033] The catalyst activity test is the same as in Example 1, and the reaction results are shown in Table 1.
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