Method for preparing catalyst for alkane ammonia oxidation reaction
A technology of oxidation reaction and catalyst, which is applied in the direction of hydrocarbon ammoxidation preparation, catalyst activation/preparation, physical/chemical process catalyst, etc. It can solve the problems of poor catalyst stability, complex preparation process, Te volatile, etc., and achieve good results , good repeatability and excellent performance
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Embodiment 1
[0046] 72.1 grams of ammonium heptamolybdate and 23.6 grams of telluric acid are dissolved in 300.0 grams of hot water to make solution (I); 16.2 grams of ammonium metavanadate are dissolved in 333.0 grams of hot water to make solution (II); 30.6 grams of niobium oxalate was dissolved in 85.0 grams of hot water to make solution (III); 11.6 grams of oxalic acid was dissolved in 20.0 grams of water to make solution (IV). Solution (I) is joined in solution (II) under stirring, then add solution (III) and solution (IV) successively, finally add 250 grams of silica sols that weight concentration is 40%, make the slurry of catalyst, will The slurry was stirred and evaporated to a solid content of 33%, then spray-dried at an inlet temperature of 350°C, and roasted in a nitrogen atmosphere at 600°C for 2 hours to obtain a propane ammoxidation catalyst of 50% Mo 1 V 0.34 Nb 0.24 Te 0.25 o x +50% SiO2 2 After tableting, 20-40 meshes were taken for fixed-bed microreflective evaluati...
Embodiment 2~6 and comparative example 2~3
[0050] Catalysts with different compositions in the following table were prepared by the same method as in Example 1, and the ammoxidation of propane to acrylonitrile was carried out with the prepared catalyst under the following reaction conditions. The specific changes and results are shown in Table 1.
[0051] The reaction conditions of above-mentioned embodiment and comparative example are:
[0052] Fixed bed reactor with an inner diameter of 8 mm
[0053] Reaction temperature 400°C
[0054] Reaction pressure Atmospheric pressure
[0055] Catalyst loading 2.0 grams
[0056] Catalyst contact time 1.2 g·s / ml
[0057] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10
[0058] Table 1
[0059]
[0060] The stability evaluation result of embodiment 1 and comparative example 1 is shown in table 2
[0061] Table 2
[0062]
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