Efficient Pt–FeOx/TiO2@SBA-15 catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol,Catalysis Science & Technology

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Efficient Pt–FeOx/TiO2@SBA-15 catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-11-13 00:00:00 , DOI: 10.1039/c7cy02008b
Yujie Xue _{1,

2,

3,

4,

5} , Ruihua Yao _{1,

2,

3,

4,

5} , Junrui Li _{1,

2,

3,

4,

5} , Guimei Wang _{1,

2,

3,

4,

5} , Peng Wu _{1,

2,

3,

4,

5} , Xiaohong Li _{1,

2,

3,

4,

5}

Affiliation

TiO₂ was coated onto mesoporous silica SBA-15 by hydrolysis of tetrabutyl titanate to prepare 15 wt% TiO₂@SBA-15 composites (15TS). The 15TS composites retain the mesostructure of the SBA-15 host, and TiO₂ was highly dispersed and uniformly coated. 5 wt% Pt nanoparticles supported on 15TS were employed for liquid-phase selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL). Compared with the Pt catalyst supported on pristine SBA-15, the Pt/15TS catalyst afforded higher activity and selectivity to COL. Furthermore, the modification of the Pt/15TS catalyst by FeO_x can greatly improve the activity and selectivity to COL. As a result, the Pt–FeO_x/15TS catalyst displayed excellent selectivity to COL (around 84.5%) at nearly complete CAL conversion. Of particular note is that further calcination of the Pt–FeO_x/15TS catalyst precursor in air at 773 K before reduction would greatly enhance the catalytic performance. Consequently, the TOF reached 3.06 s⁻¹ with a selectivity to COL of 86.4% over the Pt–FeO_x/15TS-773 catalyst. Moreover, the Pt–FeO_x/15TS-773 catalyst can also be reused about eight times without distinct loss in activity or selectivity. Based on characterization by XPS and H₂-TPR, the important promotion effect of FeO_x and strong metal–support interaction played key roles in preferential adsorption and activation of C [double bond, length as m-dash]

O bonds in CAL.

中文翻译：

高效的Pt–FeO _x / TiO ₂ @ SBA-15催化剂，用于将肉桂醛选择性加氢为肉桂醇

通过钛酸四丁酯的水解将TiO ₂涂覆到中孔二氧化硅SBA-15上以制备15wt％的TiO ₂ SBA-15复合材料（15TS）。15TS复合材料保留了SBA-15主体的介孔结构，并且TiO ₂高度分散且被均匀涂覆。将负载在15TS上的5 wt％的Pt纳米颗粒用于肉桂醛（CAL）的液相选择性加氢为肉桂醇（COL）。与负载在原始SBA-15上的Pt催化剂相比，Pt / 15TS催化剂具有更高的活性和对COL的选择性。此外，FeO _x对Pt / 15TS催化剂的改性可以大大提高活性和对COL的选择性。结果，Pt–FeO _x/ 15TS催化剂在几乎完全的CAL转化率下显示出出色的COL选择性（约84.5％）。特别值得注意的是，还原前在空气中于773 K下进一步煅烧Pt–FeO _x / 15TS催化剂前体会大大提高催化性能。因此，在Pt-FeO _x / 15TS-773催化剂上，TOF达到3.06 s ^-1，对COL的选择性为86.4％。此外，Pt-FeO _x / 15TS-773催化剂也可以重复使用约八次，而不会明显降低活性或选择性。基于XPS和H ₂ -TPR的表征，FeO _x的重要促进作用金属与载体之间的强相互作用 [双键，长度为m-破折号]

在CAL中优先吸附和活化C O键起着关键作用。

更新日期：2017-11-24

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