Catalyst, preparation method and application as well as reducing activation method of catalyst precursor and preparation method of low carbon olefin
A catalyst and precursor technology, applied in catalyst activation/preparation, preparation of liquid hydrocarbon mixture, hydrocarbon production from carbon oxides, etc., can solve problems such as unfavorable production efficiency, low reaction space velocity, and low selectivity of low-carbon olefins , to achieve high activity stability, high selectivity and high CO conversion
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[0069] According to a fourth aspect of the present invention, the present invention provides a method for preparing a catalyst, the method comprising the following steps:
[0070] (1) loading the oxide of the Group VIII metal element and / or the precursor of the oxide of the Group VIII metal element on the carrier, and calcining the carrier loaded with the oxide and / or the precursor, obtaining a catalyst precursor;
[0071] (2) Using the method described in the second aspect of the present invention to reductively activate the catalyst precursor.
[0072] The reductive activation method has been described in detail above, and will not be described in detail here, and only step (1) will be described in detail here. In the present invention, the term "precursor of an oxide of a Group VIII metal element" refers to a substance capable of forming a complete oxide of a Group VIII metal element under firing conditions.
[0073] According to the method described in the fourth aspect ...
Embodiment 1
[0129] (1) Preparation of carrier
[0130] Take γ-Al 2 o 3 (Sasol product, its specific surface area, pore volume, average pore diameter and particle size distribution are as shown in table 1) 200g, roasted 2 hours in 980 ℃ of air atmospheres, the roasted product was carried out X-ray diffraction analysis (such as figure 1 shown), it is determined that the θ-Al 2 o 3 , its specific surface area, pore volume, average pore size and particle size distribution are shown in Table 1.
[0131] Dissolve zirconium nitrate pentahydrate in 43g deionized water to make a modified zirconium solution, add 100.0g of prepared θ-Al to the modified zirconium solution 2 o 3 , saturated impregnation at 25°C for 2 hours. Then, the impregnated mixture was placed in an oven, and dried in an air atmosphere at 120° C. and normal pressure (1 standard atmospheric pressure, the same below) for 5 hours. The dried material was calcined in an air atmosphere at 400° C. for 3 hours to obtain a carrier. ...
Embodiment 2
[0141] Adopt the same method as Example 1 to prepare the catalyst and prepare low-carbon olefins, the difference is that in step (1), γ-Al 2 o 3 The carrier was prepared by directly impregnating it with the modified zirconium solution without calcination, wherein, based on the total amount of the carrier, the content of Zr was 3% by weight in terms of elements.
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