Vam shell catalyst, method for producing the same and use thereof
A technology of catalysts and catalyst carriers, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of expensive, unsustainable stability, etc., and achieve extended life, high heat resistance, high chemical effect of tolerance
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Embodiment 1
[0125] 225 g of acid-treated calcined bentonite as a natural phyllosilicate, with the trade designation "KA-0" from -Chemie AG (Munich, Germany) company obtains and has the spherical catalyst carrier shaped body of properties shown in table 3, puts into Innojet Technologies company Germany) with trade name In the fluid bed equipment of the air coating machine, by heating the compressed air (6bar) to 80°C, it is introduced into the fluid bed plane where the molded body circulates on a circular track, that is, in the vertically oriented elliptical path and Moves on a horizontal circular path perpendicular to it.
[0126] table 3:
[0127]
[0128] Once the shaped body is placed at a temperature of approximately 75 °C, 300 ml containing 7.5 g of commercially available Na 2 PdCl 4 (sodium palladium tetrachloride) and 4.6 g of commercial NaAuCl 4 The water-soluble mixed precious metal solution of (sodium gold tetrachloride) is sprayed on the formed body of the fluidized ...
Embodiment 2
[0136] 65.02 g of the catalyst carrier shaped body "KA-0" as defined in Example 1 were mixed with 43.8 ml containing 1.568 g Na 2 PdCl 4 and 0.367gHAuCl 4 The aqueous solution of is impregnated according to the pore filling method (impregnation method), wherein the support is impregnated with a solution volume corresponding to its pore volume. After impregnation, 89.17 g of a 0.35 molar NaOH solution were added to the shaped catalyst support bodies and the latter were left to stand at room temperature overnight for 22 hours. After pouring off the fixing solution, the catalyst precursor thus produced was washed with 73.68 g of 10% NaH 2 PO 2 The solution (Fluka) was reduced for 2 hours. After pouring off the reducing solution, the catalyst was rinsed with continuous changes of distilled water (flow = 140 rpm) at room temperature for 8 hours to remove residual chlorine. The final value of the rinse solution conductivity was 1.2 μS.
[0137] Thereafter, the catalyst was dri...
Embodiment 3
[0148] reactor test
[0149] 6 ml of some catalyst spheres of Example 2 and Comparative Example 1 were in each case mixed with 15% HOAc, 6% O 2 , 39%C 2 h 4 550Nml / min feed gas flow at N 2 The reaction was carried out in a fixed-bed tubular reactor at 150°C and 10 bar, and the reaction products were analyzed by gas chromatography.
[0150] Selectivity (from ethylene to VAM) according to the formula S(C 2 h 4 )=VAM moles / (VAM moles+CO 2 / 2 moles) calculation. Space / time productivity is obtained as g VAM / L catalyst / h. Oxygen conversion rate by (into O 2 moles - out O 2 moles) / into O 2 Calculate the number of moles.
[0151] The catalyst according to Example 2 of the present invention showed selectivity S(C 2 h 4 ) was 92.3% and the space / time yield (determined by gas chromatography) was 615 g VAM / L catalyst / h, the oxygen conversion was 36.5%.
[0152] The catalyst of Comparative Example 1 showed selectivity S(C 2 h 4 ) was 91.0% and the space / time yield (determin...
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