Photocatalytic Oxidation Of Tetralin To α-tetralone Over Transition Metal Doped Mesoporous Silica And MOFs

1-tetralone is a kind of fundamental medical intermediate, which could be used in production of plastics or other chemical products. At present, The synthesis of 1-tetralone in industrial production always showed weakness such as the complexity of process, the expensiveness of raw material, etc. It’s necessary to find out environmentally friendly synthetic method. Photocatalysis technology showed great performance in solving these problems. The key point in photocatalysis technology is to find out catalyst with high efficiency. Mesoporous material is a new kind of nanometer materials which developed in last two decades. When used as catalyst, nanopores in mesoporous material could play a role of microreactor and increase the reaction efficiency. Tthere is no report of using photocatalytic oxidation of tetralin to 1-tetralone over mesoporous material.This manuscript has chosen mesoporous material as research emphasis, and applied it as photocatalyst in photocatalytic oxidation of tetralin to 1-tetralone for the firest time. The main research contents are listed as follows:(1) Prepared sprial mesoporous silica nanofibers and doped transition metal on it, prepared MOFs such as HKUST-1、Fe-MIL-101、Ti-MIL-125 and Cr-MIL-101. All the well prepared materials were characterized by XRD, BET specific surface test, SEM, TEM and GC-ECD. Prepared MCM-41 with transition metal dpoed for contrast test;(2) Applied all of the prepared materials in photocatalytic oxidation of tetralin to 1-tetralone. This manuscript discussed the effect of kind and amount of catalyst, the content of doped transition metal, type of solvents and oxidanton, found out the appropriate reaction conditions. When using sprial mesoporous silica nanofibers with 5% Cu doped as photocatalyst, the suitable condition was no solvent,5 mL H2O2 as oxidant,5 mL tetralin as raw material,10 mg photocatalyst, react 8 hours under 800W Xe lamp and room temperature, the conversion of tetralin could be 21.4% and the selectivity of 1-tetralone could be 59% with the theoretical yield of 13.3%; when using Ti-MIL-125 as photocatalyst, the suitable condition was acetonitrile as solvent,8 mL H2O2 as oxidant,5 mL tetralin as raw material,10 mg photocatalyst, react 8 hours under 800 W Xe lamp and room temperature, the conversion of tetralin could be 15.6% and the selectivity of 1-tetralone could be 71% with the theoretical yield of 11.1%. These two material both showed better photocatalytic activity when contrast with commercial Degussa P25 and MCM-41 with transition metal doped.