Starting method and application of hydrocracking catalyst
A hydrocracking and catalyst technology, which is applied in the direction of start-up of hydroprocessing operations, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve the problem that the initial activity of the catalyst has not been resolved.
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Embodiment 1
[0063] Catalyst composition and hydrogen reduction procedure are the same as Comparative Example 1.
[0064] Slowly lower the temperature of the catalyst bed to 310°C, keep the maximum hydrogen circulation allowed by the device, and the pressure is 5.0MPa; use toluene with a purity greater than 99% as the starting oil, and take 0.5h -1 The space velocity condition was put in, and the volume ratio of hydrogen to oil was 1500; after 30 minutes, oil was seen at the outlet of the reactor, and the temperature at the outlet of the reactor reached a maximum of 346°C and then decreased slowly, and the heat of adsorption was slowly released. After the reactor outlet temperature drops below 320°C, gradually increase the toluene feed space velocity to 2.0h -1, and then the reactor inlet temperature was increased to 340°C, and the reactor was operated stably for 72 hours. During this period, the initial activity of the catalyst gradually decayed, and the temperature difference between th...
Embodiment 2
[0066] An appropriate amount of hydrogen-type mordenite (SAR=25) with a pore space index of 7.2 is fully mixed with pseudoboehmite, kneaded, extruded, dried at 120°C, and roasted in an air atmosphere of 550°C for 4 hours to obtain the desired catalyst carrier. A bimetallic solution was prepared with tetraammineplatinum chloride and ammonium molybdate, and the catalyst carrier was impregnated by an equal volume impregnation method, dried at 120°C and then calcined in an air atmosphere at 500°C for 2 hours. In parts by weight, the resulting catalyst consists of 0.12 parts of PtO 2 -11.70MoO 3 / 53.65 parts of mordenite - 34.53 parts of Al 2 o 3 .
[0067] The catalyst is loaded into a fixed-bed reactor, and the reactor and circulation system are replaced with nitrogen until the oxygen content is less than 0.1%, and then replaced with PSA (pressure swing adsorption device) hydrogen with a hydrogen purity of 99% and boosted to 3.0MPa. Slowly increase the inlet temperature by ...
Embodiment 3
[0070] An appropriate amount of beta zeolite with a steric index of 17.1, pseudo-boehmite with a dry basis content of 70% and amorphous silica-alumina (SiO 2 Content 6wt%, dry basis content 80%) through kneading, extrusion molding. Curing at room temperature for 24 hours, drying at 90°C for 12 hours, and calcining at 580°C for 3 hours in an air atmosphere to obtain a hydrocracking catalyst carrier. Appropriate amount of nickel nitrate and ammonium tungstate is prepared into a clear solution, which is then dried at 100°C and baked in air at 560°C for 2.5 hours after impregnating with equal volume. In parts by weight, the obtained catalyst precursor consists of 4.6 parts NiO-3.0 parts WO 3 / 34.2 parts of β-57.3 parts of Al 2 o 3 -0.9 parts of SiO 2 .
[0071] The catalyst is loaded into a fixed-bed reactor, and the reactor and circulation system are replaced with nitrogen until the oxygen content is less than 0.1%, and then replaced with PSA (pressure swing adsorption devic...
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