Recyclable Ru nano catalyst, preparation method thereof and application thereof in preparation of cis-pinane
A nano-catalyst and catalyst technology, applied in catalyst activation/preparation, catalyst, organic chemical methods and other directions, can solve the problems of easy agglomeration, separation and recovery, difficulty of nano-particle catalyst, and achieve high catalytic hydrogenation activity and cis-pinane selection. High stability, good stability, convenient separation and recovery and recyclable effects
Pending Publication Date: 2020-08-18
FUZHOU UNIV
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Problems solved by technology
However, nanoparticle catalysts generally have the problems of easy agglomeration and difficulty in separation and recovery.
Method used
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Embodiment 1
[0028] Weigh 0.01g RuCl 3 ·xH 2 O and 25g PEG6000 join in the stainless steel autoclave, the stainless steel autoclave is sealed, check for leaks, pass three times N 2 Displace the air in the unit. Heat to 90°C and maintain the temperature, and stir for 2h at a rotation speed of 500r / min. Use H again 2 The gas in the kettle of the gas replacement device was passed 3 times, and then 4MPa of H 2 Gas, reduced at the above stirring rate and temperature for 8h. Cooling Excludes H 2 , that is, PEG-stabilized Ru nanocatalysts were obtained. Its transmission electron microscope (TEM) figure 2 As shown, the average particle size is 2.3nm.
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Abstract
The invention relates to a method for preparing cis-pinane through alpha-pinene hydrogenation, and belongs to the technical field of terpene compound deep processing. Polyethylene glycol (PEG) is usedas a stabilizer to prepare the Ru nano catalyst, which has high activity and selectivity and can be recycled, and the Ru nano catalyst is used for catalyzing selective hydrogenation of alpha-pinene to prepare cis-pinane. A PEG-stabilized Ru nano catalyst is used as one phase, and a mixed solvent of toluene and n-heptane is used as the other phase to form a Ru nano catalytic system with a temperature control function, thereby implementing the hydrogenation reaction and nano catalyst separation process (high temperature mixing reaction and low temperature cooling separation). In the process ofpreparing cis-pinane by catalyzing selective hydrogenation of alpha-pinene, the system realizes efficient recycling of the Ru nano catalyst and high cis-pinane selectivity.
Description
technical field [0001] The invention belongs to the technical field of catalyst application and deep processing of terpenoids, and relates to a method for preparing cis-pinane by selective hydrogenation of α-pinene, specifically a method using PEG-stabilized Ru nanoparticles as a catalyst, Catalytic selective hydrogenation of α-pinene to produce cis-pinane. Background technique [0002] Catalytic hydrogenation of pinene to prepare pinane is an important reaction process in the production of terpene fragrances. Using turpentine oil (mainly containing α-pinene and β-pinene) as raw materials, it can produce spices such as linalool, geraniol and dihydromyrcenol, among which pinane is an important synthetic intermediate. Pinane has four isomers in cis and trans, such as figure 1 shown. [0003] Wherein, P1 and P2 are cis-pinane, P3 and P4 are trans-pinane, and they are enantiomers of each other. Generally speaking, if the content of cis-pinane in the production of terpene fra...
Claims
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IPC IPC(8): B01J23/46B01J37/18C07C5/03C07C13/40
CPCB01J23/462B01J37/18C07C5/03C07C2602/42C07B2200/09C07C2523/46B01J35/40C07C13/40Y02P20/584
Inventor 吴丹彭云鹏李碧涵郑辉东
Owner FUZHOU UNIV
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