Integrated member type methyl aromatic hydrocarbon selective oxidizing catalyst and its preparation and use
A technology for methyl aromatic hydrocarbons and oxidation catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst carriers, etc., can solve the problem of reducing device capacity, catalyst activity and selectivity to be improved , Catalyst failure and other problems, achieve the effect of overcoming environmental problems, good industrial application prospects, and high selectivity
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Embodiment 1
[0035] 10 grams of vanadium pentoxide, 5 grams of phosphorous acid, 1.2 grams of antimony trioxide, 0.2 grams of aluminum nitrate, 0.2 grams of chromium nitrate, and 0.3 grams of potassium nitrate were dissolved in 500 ml of deionized water to prepare solution (1); take 11 grams of oxalic acid Dissolve in 100ml deionized water to prepare solution (2).
[0036] Use an oil bath to control the temperature of the solution (1) at 100-110° C., stir and reflux. Solution (2) was slowly added dropwise to solution (1) to obtain solution (3). After the dropwise addition, continue heating and stirring the solution (3) until the solution becomes clear, distill the solution (3) under reduced pressure at 60° C., remove part of the water, concentrate 600ml to 300ml, and obtain the catalyst precursor for use. Take the specific surface area as 200~300g / m 2 γ-Al 2 o 3 Add 100 grams of powder into 200ml of deionized water, stir, and add nitric acid dropwise to adjust the pH of the suspension ...
Embodiment 2
[0043] The catalyst precursor was prepared according to the method of Example 1 for use.
[0044] Prepare 200ml AlCl of 1M 3 Aqueous solution, slowly added dropwise to 800ml ammonia solution of 10wt%, and accompanied by vigorous stirring, after the precipitation reaction was completed, continued to stir for 3h, aging for 5h, to obtain Al(OH) 3 Precipitate the suspension, after filtering, the filter cake is washed 3 times with 500ml deionized water, and then made into 1.1g / ml concentration of Al(OH) 3 colloidal solution.
[0045] The metal corrugated thin plate material is FeCrAl alloy, 80mm×80mm×0.1mm (length×width×thickness) specifications, soaked in 2wt% sulfuric acid for 30min, washed twice with 100ml deionized water, and then in the muffle furnace at 850 ℃ air Calcined at lower temperature for 10h to obtain Al on the surface 2 o 3 Whisker material.
[0046] Metal sheet support directly immersed in Al(OH) 3 Colloidal solution, impregnated at least 4 times, and then ba...
Embodiment 3
[0049] The catalyst precursor was prepared according to the method of Example 1 for use.
[0050] Be prepared with the Al(OH) of 1.1g / ml concentration according to the method for embodiment 2 3 The colloidal solution is ready for use.
[0051]The wire mesh material is 316L stainless steel 3×7cm, the hole size is 30 mesh, the wire mesh is soaked in 2% sulfuric acid for 1 hour, and then washed with 100ml deionized water. Coating a layer of Al on the surface of the screen by electrophoretic deposition (EPD) 2 o 3 , the specific preparation process of the EDP method is: take 0.8 grams of aluminum powder (average particle size is 5um), 0.0032 grams of polyacrylic acid (PAA) and 0.02 grams of triethylamine (TEA) into 400ml of ethylene glycol, stir to form aluminum powder suspension , and then treated under ultrasonic for 30 minutes, using 30-mesh wire mesh as electrodes, the distance between electrodes was 1 cm, the working voltage was 100 V, and the deposition time was 2 minutes...
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