Effect of Ni2P loading on the structure and naphthalene hydrogenation performance of Ni2P/Ce-Al2O3 catalyst
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摘要: 采用程序升温还原法制备了一系列Ni2P/Ce-Al2O3催化剂，考察了制备过程中Ni2P负载量对催化剂结构及萘加氢饱和性能的影响。结果表明，Ni2P负载量可调控活性组分Ni2P与载体Ce-Al2O3之间的相互作用，进而调变催化剂的比表面积、Ni2P粒径及催化剂活性位点数量。当Ni2P负载量（质量分数）为17%时，催化剂具有较大的比表面积（40 m2/g）、较小的Ni2P粒径（26.3 nm）和最多的活性位点数量（26.7 μmol/g）；同时，该催化剂萘转化率为95%，十氢萘选择性为76%，且活性稳定性良好，这主要归因于催化剂大的比表面积和高的活性位点数量为反应提供了更多的场所。
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关键词:
- 萘加氢 /
- Ni2P/Ce-Al2O3 /
- Ni2P负载量 /
- 程序升温还原法
Abstract: A series of Ni2P/Ce-Al2O3 catalysts were prepared by temperature-programmed reduction method, and the influence of Ni2P loading on the catalyst structure and naphthalene hydrogenation saturation performance was investigated. The results show that the specific surface area, the Ni2P particle size and the active site number of the as-synthesized catalysts are greatly affected by Ni2P loading, which is derived from the variable interaction between active component Ni2P and the support Ce-Al2O3. When the Ni2P loading is 17% (mass ratio), the catalyst possesses a large specific surface area (40 m2/g), a small Ni2P particle size (26.3 nm), and the maximum number of active sites (26.7 μmol/g). Meanwhile, the conversion rate of naphthalene and the selectivity of decalin reach to 95% and 76%, respectively, and the activity stability of the catalyst is good, which is mainly attributed to the large specific surface area and high number of active sites of the catalyst providing more sites for the reaction. -
图 2 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂的XRD谱图
Figure 2 XRD patterns of the Ni2P/Ce-Al2O3 catalysts with different loadings of Ni2P
图 3 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂的H2-TPR谱图
Figure 3 H2-TPR profiles of Ni2P/Ce-Al2O3 catalysts with different loadings of Ni2P
图 4 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂的TEM照片
Figure 4 TEM images of Ni2P/Ce-Al2O3 catalyst with different loadings of Ni2P
图 5 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂上萘的转化率随时间的变化
Figure 5 Conversion of naphthalene over Ni2P/Ce-Al2O3 catalysts with different loadings of Ni2P
图 6 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂上十氢萘的选择性随时间的变化
Figure 6 Selectivity to decalin over Ni2P/Ce-Al2O3 catalysts with different loadings of Ni2P
表 1 不同Ni2P负载量的Ni2P/Ce-Al2O3催化剂的织构性质和CO吸附量
Table 1 Textural and structural properties of the Ni2P/Ce-Al2O3 catalysts with different Ni2P loadings
Sample BET surface area
A/(m2·g-1)Maximum aperture
/nmCrystallite size
d/nm aParticle
size d/nm bCO uptake
/(μmol·g-1)Al2O3 107 6.4 - - - Ce-Al2O3 93 6.7 - - - Cat-5 87 4.3 - 12.0 7.8 Cat-11 60 5.2 13.1 24.7 12.4 Cat-17 40 5.7 13.7 26.3 26.7 Cat-23 15 6.1 33.1 40.6 15.0 Cat-100 7 10.7 44.9 - 0.5 a: calculated from XRD results; b: calculated from TEM results 
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