采用沉积-沉降法制备了负载型Au/γ-Fe2O3、Au/α-Fe2O3和Au/Fe3O4催化剂,并利用X射线粉末衍射技术对催化剂进行了表征.在不同反应介质(水、乙醇和无溶剂)中,研究了Au/FeOx催化剂催化3-硝基苯乙烯加氧反应,考察了反应温度以及载体对催化剂活性的影响.实验结果表明,在介质水中3-硝基苯乙烯的转化率要远高于乙醇中或无溶剂条件下的转化率,且随温度的升高而增大,而其加氢产物3-氨基苯乙烯的选择性无显著变化.不同氧化铁载体负载的Au催化剂在水中的活性顺序为Au/γ-Fe2O3>Au/α-Fe2O3>Au/Fe3O4,其活性的差异被认为来自于不同氧化铁载体与Au之间的相互作用.
参考文献
| [1] | Boronat M,Concepcion P,Corma A,et al.A Molecular Mechanism for the Chemoselective Hydrogenation of Substituted Nitroaromatics with Nanoparticles of Gold on TiO2 Catalysts:A Cooperative Effect between Gold and the Support[J].J Am Chem Soc,2007,129(51):16230-16237. |
| [2] | Breslow R.Hydrophohic Effects on Simple Organic-Reactions in Water[J].Acc Chem Res,1991,24(6):159-164. |
| [3] | Chanda A,Fokin V V.Organic Synthesis"On Water"[J].Chem Rev,2009,109(2):725-748. |
| [4] | Maity P,Basu S,Bhaduri S,et al.Superior Performance of A Nanostructured Platinum Catalyst in Water:Hydrogenations of Alkenes,Aldehydes and Nitroaromatics[J].Adv Synth Catal,2007,349(11/12):1955-1962. |
| [5] | Wolf A,Schuth F.A Systematic Study of the Synthesis Conditions for the Preparation of Highly Active Gold Catalysts[J].Appl Catal A-Gen,2002,226(1/2):1-13. |
| [6] | Nishimura S.Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis[M].Chapt.9.New York:John Wiley and Sons,Inc,2001:336 |
| [7] | Chanda A,Fokin V V.Organic Synthesis"On Water"[J].Chem Rev,2009,109(2):725-748. |
| [8] | Jorge M,Natalia M,Cordeiro D S.Intrinsic Structure and Dynamics of the Water/nitrobenzene Interface[J].J Phy Chem C,2007,111(47):17612-17626. |
| [9] | Milone C,Ingoglia R,Schipilliti L,et al.Selective Hydrogenation of Alpha,Beta-unsaturated Ketone to Alpha,Betaunsaturated Alcohol on Gold-supported Iron Oxide Catalysts:Role of the Support[J].J Catal,2005,236(1):80-90. |
| [10] | Huang J,Dai W L,Fan K.Remarkable Support Crystal Phase Effect in Au/FeOx Catalyzed Oxidation of 14-Butanediol toγ-Butyrolactone[J].J Catal,2009,226(1):228-235. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%