Preparation of the PdAg/CDs composite and its catalytic performance in the hydrogenolysis of glucose
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摘要: 以碳点(carbon dots, CDs)为还原剂和载体,采用简便的光照还原法制备出了PdAg/CDs复合催化剂。XRD、TEM、FT-IR和XPS等技术对催化剂的表征分析,结果表明该催化剂平均粒径为10.45 nm,Pd和Ag主要以零价态的合金形式负载在碳点表面。将PdAg/CDs复合催化剂用于水中葡萄糖的氢解,催化评价结果表明,在初始H2压力为4 MPa、葡萄糖100 mg、催化剂25 mg、反应温度140 ℃的条件下反应3 h,该催化剂显示出较好的氢解活性,葡萄糖的转化率为68.85%,氢解产物丙酮醇的收率达到8.36%。
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关键词:
- PdAg/CDs复合催化剂 /
- 葡萄糖 /
- 氢解 /
- 碳点
Abstract: With carbon dots (CDs) as the reducing agent and support, a PdAg/CDs composite catalyst was prepared by simple light reduction method. The results of XRD, TEM, FT-IR and XPS characterization indicate that the PdAg/CDs composite has an average particle size of about 10.45 nm, where Pd and Ag exist on the surface of CDs mainly in the alloy form of zero valence. The catalytic performance of the PdAg/CDs composite was evaluated in the hydrogenolysis of glucose in water. The results illustrate that the PdAg/CDs composite catalyst is highly active in the glucose hydrogenolysis; after reaction for 3 h under 140 °C, 4 MPa of initial H2 pressure, 100 mg of glucose and 25 mg of catalyst, the conversion of glucose is 68.85% and the yield of acetol reaches 8.36%.-
Key words:
- PdAg/CDs catalyst /
- glucose /
- hydrogenolysis /
- carbon dots
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表 1 葡萄糖催化氢解的产物成分
Table 1 Product components of glucose catalyzed hydrogenolysis
Serial number Substance Relative content /% without catalyst Pd/CDs Ag/CDs PdAg/CDs 1 formic acid acids 1.33 2.34 2.33 1.3 2 acetic acid 4.12 13.8 14.07 5.48 3 3-deoxy-d-mannonic acid 14.1 13.1 − 10.19 4 4-methyloctanoic acid − − − 2.06 subtotal of acids 19.55 29.24 16.4 19.03 5 DL-arabinose saccharide 4.88 − − 3.39 6 other sugars 33.83 − − − subtotal of saccharides 38.71 − − 3.39 7 1-hydroxy-2-butanone ketones − 1.79 1.49 4.07 8 1,3-dihydroxyacetone 3.72 − − 5.17 9 3-hydroxydihydro-2(3H)-furanone 1.25 − − − 10 furaneol 0.88 1.19 4.05 4.63 11 4H-pyran-4-one 2.26 − 0.68 − subtotal of ketones 8.11 2.98 6.22 13.87 12 acetol alcohols 10.71 33.94 44.72 40.28 13 2,6-dimethyl-3-heptanol − − − 3.23 14 tetrahydropyran-2-methanol − − 2.23 1.07 subtotal total of alcohols 10.71 33.94 46.95 44.58 15 5-hydroxymethylfurfural aldehydes 22.92 − − 0.99 subtotal total of alcohols 22.92 − − 0.99 16 others − 33.84 30.43 18.14 total 100 100 100 100 Reaction condition: 100 mg glucose; 25 mg catalyst; 30 mL deionized water; reaction temperature 140 ℃; reaction time 3 h and 4 MPa H2 表 2 不同催化剂对葡萄糖氢解转化率及产物收率的影响
Table 2 Conversion of glucose and yield of products for the glucose hydrogenolysis over different catalysts
Catalyst Conversion/% Yield/% acetol 5-hydroxymethylfurfural others Without catalyst 31.45 2.09 14.78 14.58 Ag/CDs 37.60 6.23 0 31.37 Pd/CDs 51.46 5.41 0 46.05 PdAg/CDs 68.85 8.36 0.68 59.81 -
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