Novel process and catalyst system for improving dewaxing catalyst stability and lubricant oil yield
A catalyst and lubricating oil technology, applied in the field of high-grade products, can solve problems such as yield loss
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Embodiment 1
[0082] Example 1. Catalyst A was prepared using an alumina substrate (base) with a surface area calculated by nitrogen adsorption / desorption of 150m 2 / g, the mercury injection volume is 0.84cc / g, and the macropore volume is 0.075cc / g. A 20 g (volatiles free) alumina substrate was impregnated by incipient wetness with a solution of 0.16 g of chloroplatinic acid and 0.2 g of palladium dichloride in 18 ml of 1% HCl in deionized water to form a reaction mixture. The reaction mixture was soaked for 24 hours then dried at 150°C for 1 h and then calcined at 300°C for 1 h to produce the finished hydrotreating catalyst. The finished hydroprocessing catalyst had a Pt and Pd content of 0.3 wt.% and 0.6 wt.%, respectively.
Embodiment 2
[0083] Example 2. Composed of 80% pseudoboehmite alumina (Versal 250 alumina, UOP), 10% boehmite alumina (Catapal B, Sasol) and 10% finely ground calcined alumina (less than 325 Tyler mesh) to prepare Catalyst B. The alumina powder was dry mixed in a Baker-Perkins mixer for 10 minutes and then sprayed with a solution containing 4% nitric acid to a volatile target of 62% to form a wet dough. The wet dough was mixed for a total of 30 minutes, then transferred to a Loomis RAM extruder and forced through a 1 / 16" die insert to form an extrudate. The extrudate was dried at 130°C under high gas flow for 30 minutes, and calcined in air at 680°C for 1 hour to produce a calcined alumina substrate. The resulting calcined alumina substrate had a surface area as determined by nitrogen adsorption / desorption of 260m 2 / g, the mercury injection volume is 0.62cc / g and the macropore volume is 0.001cc / g. The calcined alumina substrate was then impregnated with Pt and Pd using the same procedur...
Embodiment 3
[0084] Example 3. Catalyst C was prepared using an alumina substrate with a surface area calculated by nitrogen adsorption / desorption of 192 m 2 / g, the mercury injection volume is 0.75cc / g, and the macropore volume is 0.01cc / g. 99 g (volatiles-free) alumina substrate was impregnated by incipient wetness with a 3.1% aqueous solution of Pt as tetraamminedinitrate, adjusted to pH 9.7, to form a reaction mixture. The reaction mixture was soaked for 24 hours then dried at 150 °C for 1 h and then calcined at 370 °C for 1 h to produce the finished catalyst. The finished catalyst had a Pt content of 1 wt.%.
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Abstract
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