Hydrodesulfurization catalyst and system, preparation method thereof, and method for hydrodesulfurization of diesel
A hydrodesulfurization and catalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unfavorable catalyst regeneration, complexity, and catalyst preparation technology that cannot meet the requirements, and achieve high desulfurization activity, increase the degree of sulfidation, and improve the effect of desulfurization activity
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[0040] According to the preparation method of the catalyst of the present invention, preferably, the method further comprises increasing the temperature by 20-150°C from the temperature corresponding to the highest exothermic peak of the carboxylic acid compound at a rate of 1-20°C / h. °C is preferably 1-10 °C, more preferably 5-10 °C and is kept constant for 1-15 h, preferably 1-10 hours.
[0041] By adopting a multi-stage sulfuration method, the degree of sulfuration of the metal in the catalyst is increased, so the catalyst has a high number of active centers.
[0042] In order to improve the activity of the catalyst, a special sulfidation step is taken in the present invention. The method can convert more active metals in the oxidized catalyst into a sulfurized state, increase the number of active components, and increase the proportion of active phases stacked with four or more layers, so that the catalyst exhibits higher hydrodesulfurization activity.
[0043] When the o...
Embodiment 1
[0087] The carboxylic acid compound contained in the catalyst A1 is citric acid, the content of cobalt oxide is 5%, the content of molybdenum oxide is 17%, P 2 o 5 The content is 6%, and the molar ratio of citric acid to cobalt is 1.5:1.
[0088] Catalyst B1 contains nickel oxide 5%, molybdenum oxide content is 22%, P 2 o 5 The content is 6%, and the molar ratio of citric acid to nickel is 1.5:1.
[0089] The catalyst is determined by temperature-programmed oxidation experiments, and it can decompose and release CO between 230°C-300°C and 300°C-400°C. 2 , and the release temperatures were 290°C and 370°C, respectively.
[0090] Catalyst A1 is packed in the upper bed, catalyst B1 is packed in the lower bed, and the volume ratio of catalyst A1 to catalyst B1 is 1:1.
[0091] The hydrodesulfurization activity evaluation of the catalyst was carried out on a 20mL high-pressure hydrodesulfurization evaluation device, and the catalyst system was vulcanized by the sulfidation met...
Embodiment 2
[0103] The carboxylic acid compound contained in catalyst A2 is tartaric acid, the content of cobalt oxide is 6%, the content of molybdenum oxide is 20%, the content of MgO is 5.4%, and the molar ratio of tartaric acid to cobalt is 1:1.
[0104] Catalyst B2 contains 6% nickel oxide, 20% molybdenum oxide, 5.4% MgO, and the molar ratio of tartaric acid to nickel is 1:1.
[0105] Catalyst A2 is packed in the upper bed, catalyst B2 is packed in the lower bed, and the volume ratio of catalyst A2 to catalyst B2 is 2:1. According to the temperature-programmed oxidation test, the catalysts decompose and release CO at 280°C and 350°C respectively. 2 .
[0106] Carry out the vulcanization and vulcanization performance test of the catalyst system according to the method of Example 1, the difference is that the vulcanization program is changed to: be heated to 280 ° C at a heating rate of 5 ° C / h and then keep the temperature for 2 h, and then at a temperature of 5 ° C / h The heating...
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