Fischer-Tropsch synthesis naphtha conversion catalyst and preparation method thereof
A Fischer-Tropsch synthesis and catalyst technology, applied in physical/chemical process catalysts, reformed naphtha, molecular sieve catalysts, etc., to achieve high reactivity and service life
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[0028] The preparation method of catalyst provided by the invention comprises the steps:
[0029] (1) Mix hydrogen type ZSM-5 zeolite, alumina and silica sol, form, obtain carrier after drying and roasting,
[0030] (2) steaming the carrier at 450-700°C,
[0031] (3) impregnating the steam-treated carrier with a solution of a compound containing a group VA element and a compound containing a rare earth element, then drying and calcining.
[0032]In the above-mentioned method, (1) step is carrier molding, first hydrogen type ZSM-5 zeolite is mixed with alumina, silica sol and shaped. The molding can be extrusion molding, drop ball, rolling ball or tablet molding. Preferably extrusion molding, during extrusion molding, preferably adds appropriate amount of peptizer kneading, extruding molding in the mixture, and described peptizing agent is preferably dilute nitric acid solution. After molding, the solid is dried and calcined to obtain the carrier. The calcination temperatur...
example 1
[0049] The catalyst is prepared according to the method of the present invention.
[0050] (1) Preparation of carrier
[0051] Take SiO 2 / Al 2 o 3 130 grams of HZSM-5 zeolite powder with a mol ratio of 56, 35 grams of pseudo-boehmite powder, 35 grams of silica sol (SiO 2 content is 30% by mass), add 100g concentration of 1.0m% nitric acid aqueous solution and stir, let stand to make peptization, after kneading, extrude into strips with a diameter of 2 mm, dry at 110°C for 4 hours, cut into 2-3 mm in length , calcined at 550°C for 4 hours to obtain a carrier, in which the alumina is γ-Al 2 o 3 .
[0052] (2) steam treatment
[0053] Put the carrier prepared in step (1) into a tubular reactor, raise the temperature to 550° C. under 0.1 MPa and air flow, and pass in steam for 4 hours, and the α value is 33.
[0054] (3) Preparation of catalyst
[0055] Take 100 grams of the carrier treated with water vapor in step (2), immerse it in 50ml of phosphoric acid solution with...
example 2
[0057] Prepare catalyst by the method for example 1, difference is (1) step gets SiO 2 / Al 2 o 3 130 grams of HZSM-5 zeolite powder, 50 grams of pseudo-boehmite powder, and 20 grams of silica sol in a molar ratio of 56, adding 100 g of a concentration of 1.0 m% nitric acid aqueous solution, stirring, mixing, extruding, drying, and roasting to obtain a carrier, After steam treatment, the α value of the carrier was 35, and then impregnated to introduce phosphorus and mixed rare earths. The composition of the prepared catalyst C is shown in Table 1. The XRD diffraction pattern of catalyst C is shown in figure 1 , it can be seen that a new diffraction peak appears around 20° at 2θ, which is the diffraction peak of amorphous aluminum silicate. The B (Bronsted) acid and L acid (Lewis) acid measured by pyridine adsorption at different temperatures The quantity is shown in Table 2.
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