Pd/mpg-C3N4催化剂的制备、表征及其对松香加氢反应的催化性能

doi:10.3969/j.issn.0253-2417.2019.02.011

Abstract

Abstract:

Using SiO₂ and melamine as raw materials, mesoporous graphitic carbon nitride(mpg-C₃N₄) was prepared by high-temperature baking method. Pd/mpg-C₃N₄ was then prepared by impregnating of Pd nanoparticles and used to catalyze the hydrogenation of rosin. XRD, FT-IR, TEM, ICP-AES, XPS, nitrogen adsorption-desorption and GC were used to analyze the structure, morphology, actual loading of Pd, metal valence, specific surface area, pore size and catalytic activity of the catalyst. The results showed that nano-Pd was successfully uniformly dispersed in the layered structure of carbon nitride. Pd/mpg-C₃N₄ still maintained the mesoporous structure after Pd loading. However, due to Pd loading, the BET surface area, pore volume and pore diameter of mpg-C₃N₄ were reduced to 47.73 m²/g, 0.17 cm³/g and 3.39 nm, respectively. Hydrogenated rosin products with 5.99% dehydroabietic acid and less than 1% abietic acid were obtained under the optimized conditions for the hydrogenation of rosin (7.96% Pd loading, 5 MPa H₂, 150 ℃, 4 h). After four cycles for the catalyst, the GC content of tetrahydroabietic acid decreased from 37.12% to 24.71%, and the GC content of dehydroabietic acid increased from 5.99% to 9.76%.

Key words: mesoporous graphitic carbon nitride, nano-palladium, rosin, catalytic hydrogenation

CLC Number:

TQ35

Xiaohao LI,Congxia XIE. Preparation, Characterization and Performance for Rosin Hydrogenation of Pd/mpg-C₃N₄ Catalyst[J]. Chemistry and Industry of Forest Products, 2019, 39(2): 73-80.

Figures/Tables 10

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References 15

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样品 samples	比表面积/(m²·g^-1) BET specific surface area	孔容/(cm³·g^-1) pore volume	孔径/nm pore diameter
g-C₃N₄	6.61	0.03	1.78
mpg-C₃N₄	60.31	0.21	8.88
Pd/mpg-C₃N₄	47.73	0.17	3.39

催化剂种类 catalyst type	四氢枞酸/% tetrahydroabietic acid	二氢枞酸/% dihydroabietic acid	去氢枞酸/% dehydroabietic acid	枞酸/% abietic acid
Pd/C	28.44	64.84	6.61	< 1
Ru/C	16.70	62.62	11.11	9.57
Raney-Ni	18.06	61.38	19.48	1.08
Pd/mpg-C₃N₄	37.12	56.71	5.99	< 1
Pd/g-C₃N₄	21.20	63.56	13.19	2.05

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Preparation, Characterization and Performance for Rosin Hydrogenation of Pd/mpg-C₃N₄ Catalyst

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Preparation, Characterization and Performance for Rosin Hydrogenation of Pd/mpg-C3N4 Catalyst

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Preparation, Characterization and Performance for Rosin Hydrogenation of Pd/mpg-C₃N₄ Catalyst