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US 2020/0361840 A1Published application
Process for forming a photocatalyst and oxidizing a cycloalkane
AssigneeKing Abdulaziz University
InventorsMohamed Abdel Salam, Hind Al-Johani
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Abstract
Methods of preparing Pt/SrTiO3 photocatalysts comprising strontium titanate nanoparticles and platinum doped on a surface of the strontium titanate nanoparticles are described. Processes of oxidizing cycloalkanes to cycloalkanols and/or cycloalkanones by employing the Pt/SrTiO3 photocatalysts are specified. A method for recycling the photocatalyst is also provided.
Claims13
1:
- A process of forming a Pt/SrTiO3 photocatalyst and oxidizing a cycloalkane to a cycloalkanol and/or a cycloalkanone, the process comprising:
- reacting strontium acetate with acetic acid to form a precursor composition;
- adding titanium isopropoxide to the precursor composition and treating with low-frequency ultrasound to form a second composition comprising strontium titanate nanoparticles;
- drying the second composition and calcining in air to form a powder;
- depositing platinum on the powder and reducing the platinum with hydrogen to form the Pt/SrTiO3 photocatalyst in the form of strontium titanate nanoparticles having surface doped Pt;
- wherein the platinum is present in an amount of 1.0-2.0 wt % relative to a total weight of the Pt/SrTiO3 photocatalyst;
- then
- contacting a feed mixture comprising the cycloalkane and an oxidant with the Pt/SrTiO3 photocatalyst thereby forming a reaction mixture;
- and
- concurrently irradiating the reaction mixture with light thereby forming the cycloalkanol and/or the cycloalkanone.
7 more elements
2-6. (canceled)
7:
- The process of claim 1, wherein the feed mixture is contacted with the Pt/SrTiO3 photocatalyst at a pressure of 0.5-2 atm.
8:
- The process of claim 1, wherein the feed mixture is contacted with the Pt/SrTiO3 photocatalyst at a temperature of 40-80° C.
9:
- The process of claim 1, wherein the cycloalkane is present in the feed mixture at a concentration of 10-400 ppm.
10:
- The process of claim 1, wherein the oxidant is present in an amount of 5-30 vol. % relative to a total volume of the feed mixture.
11:
- The process of claim 1, wherein the Pt/SrTiO3 photocatalyst is present at a concentration of 0.2-5.0 g of photocatalyst per liter of the reaction mixture.
12:
- The process of claim 1, wherein the oxidant is O2.
13-15. (canceled)
16:
- The process of claim 1, wherein the cycloalkane is cyclohexane, the cycloalkanol is cyclohexanol, and the cycloalkanone is cyclohexanone.
17:
- The process of claim 1,
- wherein the reaction mixture is irradiated with light for 1 to 4 hours;
- and
- wherein the process has a molar conversion of the cycloalkane to the cycloalkanol and/or cycloalkanone of greater than 95%.
1 more element
18:
- The process of claim 1, further comprising:
- recovering the Pt/SrTiO3 photocatalyst after the irradiating to obtain a recovered Pt/SrTiO3 photocatalyst;
- and
- reusing the recovered Pt/SrTiO3 photocatalyst, which maintains photocatalytic activity for at least 4 reaction cycles.
1 more element
19-20. (canceled)