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Citation: SONG He, JIA Li-Hua, GUO Xiang-Feng. Catalytic Oxidation of Benzyl Alcohol to Benzyl Aldehyde with Ti/W-HMS[J]. Chinese Journal of Applied Chemistry, ;2009, 26(2): 168-172. shu

Catalytic Oxidation of Benzyl Alcohol to Benzyl Aldehyde with Ti/W-HMS

1.
Chemical and Chemistry Engineering College of Qiqihar University, Qiqihaer 161006

Corresponding author: JIA Li-Hua,
Received Date: 10 January 2008
Available Online: 22 April 2008
Fund Project: 黑龙江省自然科学基金资助项目(B200608) (B200608)

Ti-HMS and Ti/W-HMS molecular sieves were synthesized by varying the ratio of n(Si)/n(Ti) and n(Si)/n(W),and were used for the NH₃-TPD analysis.The acidity of the molecular sieve is the largest when n(Si):n(Ti)=30:1,n(Si):n(W)=400:1.Different HMS were used for the oxidation of benzyl alcohol to benzyl aldehyde with 30% hydrogen peroxide solution as the oxidizing agent without any organic solvent and phase transfer catalyst.The results show that benzyl alcohol can be selectivity oxidized to benzyl aldehyde by Ti/W-HMS molecular sieves.The activity and selectivity of catalyst can be improved with increasing the acidity and acid strength.With Ti(30)/W(400)-HMS as catalyst,at n(alcohol):n(hydrogen peroxide)=1:2,ω(catalyst)=4%,and the reaction time 5 h,the conversion of benzyl alcohol and the selectivity of benzyl aldehyde reached to 72.6% and 96.9%,respectively.The conversion of benzyl alcohol and the selectivity of benzyl aldehyde reached to 63.2% and 89.1%,respectively,after catalyst was used for four times.
- HMS,
- benzyl alcohol,
- benzyl aldehyde
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