Research on the 9,10-dihyroanthrancene assisted catalytic pyrolysis of pine over nitrogen-doped activated carbon for preparation of alkoxyphenols
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摘要: 本研究以核桃壳基掺氮活性炭(NAC)为催化剂、以9,10-二氢蒽(DHA)为供氢剂,开展了松木选择性热解制备烷氧基酚研究,探究了氨水浓度对NAC理化性能的影响,揭示了DHA/松木比、热解温度、NAC/松木比对烷氧基酚生成的调控机制。结果表明,合适的氨水浓度能够改善NAC孔隙结构及活性位点分布,当氨水浓度为15%时,所制备NAC对烷氧基酚的生成促进效果最佳;当DHA/松木比为3、热解温度为550 ℃、NAC/松木比为3时,烷氧基酚产率最大,为5.27%,明显高于纯松木直接催化热解时烷氧基酚产率(1.74%)。Abstract: In this study, nitrogen-doped activated carbon (NAC) was prepared from walnut shell and applied to the catalytic pyrolysis of pine for selective preparation of alkoxyphenols with 9,10-dihyroanthrancene (DHA) as the hydrogen donor. The effects of ammonia concentration on the physicochemical properties of NAC were investigated. The regulatory functions of DHA/pine ratio, pyrolysis temperature, and NAC/pine ratio on the generation of alkoxyphenols were revealed. The results showed that the pore structure and active sites distribution of NAC could be improved by proper ammonia concentration. The NAC prepared at ammonia concentration of 15% was the best for the production of alkoxylphenols. The yield of alkoxylphenols reached its maximum value of 5.27% at DHA/pine ratio of 3, pyrolysis temperature of 550 ℃, and NAC/pine mass ratio of 3, which was much higher than that from catalytic pyrolysis of pure pine (1.74%).
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Key words:
- biomass /
- nitrogen-doped activated carbon /
- catalytic pyrolysis /
- 9,10-dihyroanthrancene /
- alkoxyphenols
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表 1 NAC的孔结构参数
Table 1 Pore structure parameters of NAC
Sample SBET/(m2·g−1) Smica/(m2·g−1) vtotalb/(cm3·g−1) vmicc/(cm3·g−1) vmic/vtotal/% daverage/nm 0%-NAC 748.541 528.310 0.486 0.262 53.91 2.493 5%-NAC 871.653 565.312 0.547 0.298 54.48 2.512 15%-NAC 891.144 749.898 0.503 0.394 78.33 2.258 25%-NAC 856.319 780.752 0.442 0.384 86.88 2.066 a, c: t-plot surface area and pore volume of micropores, b: p/p0= 0.9907. 表 2 NAC中不同种类含氮官能团的相对含量
Table 2 Relative contents of different types of nitrogen-containing functional groups in NAC
Sample Pyridinic-N/% Nitrogen oxide/% Pyrrolic-N/% Pyridone-N-oxide/% 5%-NAC 21.78 29.24 28.19 20.79 15%-NAC 32.03 24.07 33.26 10.64 25%-NAC 29.47 34.41 23.54 12.58 -
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