Method for preparing polymetallic reforming catalyst
A reforming catalyst and multi-metal technology, which is applied to the multi-metal reforming catalyst of rhenium to prepare platinum-containing fields, can solve the problems of decreased adsorption efficiency, increased platinum dosage, increased production cost, etc., and achieves improved contact, high activity and selection. The effect of promoting uniform distribution
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[0010] The preparation method of the multi-metal reforming catalyst provided by the present invention comprises preparing a water-soluble compound containing platinum, rhenium, lanthanide metals or yttrium and chlorine into an impregnation solution, and the amount of the impregnation solution is 1.1 to 5.0 times the saturated adsorption capacity of the carrier, The carrier is impregnated under the conditions of 0.001-0.08MPa and rotation, and then calcined. The catalyst includes 0.1-2.0 wt% of platinum, 0.1-2.0 wt% of rhenium, 0.2-3.0 wt% of chlorine, 0.01-2.0 wt% of lanthanide metal or yttrium and inorganic refractory oxide carrier.
[0011] The method of the invention is suitable for the preparation of multi-metal reforming catalysts, especially for the preparation of platinum-rhenium reforming catalysts containing the third metal component. The third metal component is preferably a lanthanide metal or yttrium, such as lanthanum, cerium, praseodymium, neodymium, promethium, ...
example 1～4
[0028] The catalyst is prepared by the method of the present invention.
[0029] Take 60 grams of γ-Al 2 o 3 The carrier, whose saturated adsorption capacity is 58 milliliters, is made into 82 milliliters impregnating solution with predetermined amount of chloroplatinic acid, perrhenic acid, yttrium nitrate and hydrochloric acid, which contains 0.22% of Pt, 0.48% of Re, 1.8% of Cl and appropriate amount of yttrium or rare earth metals (relative to the weight of alumina on a dry basis), the volume ratio of the impregnation solution to the carrier is 1.2. Pour the support and impregnation solution into a 500 mL flask and impregnate on a rotary vacuum evaporator. The control conditions are: 0.02MPa, 50°C, and 0.05m / s rotation speed. After 2 hours impregnation and drying were complete. Take out the solid and bake it in dry air at 500°C for 4 hours at an air-to-solid volume ratio of 700, H2 The catalyst was prepared by reducing for 4 hours at a temperature of 480°C and an air-t...
example 5
[0032] The catalysts prepared by the method of the present invention and the catalysts A-2, B-2, C-2, and D-2 prepared by the comparative method were repeatedly analyzed for their metal component content. Three groups of samples were randomly selected from different parts of each catalyst sample, and the metal content was analyzed. The results are shown in Table 2.
[0033] It can be seen from Table 2 that the catalyst metal content data of the present invention has good repeatability, indicating that the catalyst metal components are evenly distributed between the carrier layers. However, the metal content data of the comparative catalyst prepared by the saturated impregnation method has poor repeatability, indicating that the metal components are not evenly distributed between the support layers.
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