Alkylphenols are a group of valuable phenolic compounds that can be derived from lignocellulosic biomass. In this study, three activated carbons (ACs) were prepared for catalytic fast pyrolysis (CFP) of walnut shell to produce alkylphenols, including nitrogen-doped walnut shell-derived activated carbon (N/WSAC), nitrogen-doped rice husk-derived activated carbon (N/RHAC) and walnut shell-derived activated carbon (WSAC). Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were carried out to reveal the influences of AC type, pyrolytic temperature, and AC-to-walnut shell (AC-to-WS) ratio on the product distributions. Results showed that with nitrogen doping, the N/WSAC possessed stronger capability than WSAC toward the alkylphenols production, and moreover, the N/WSAC also exhibited better effects than N/RHAC to prepare alkylphenols. Under the catalysis of N/WSAC, yields of alkylphenols were significantly increased, especially phenol, cresol and 4-ethylphenol. As the increase of pyrolytic temperature, the alkylphenols yield first increased and then decreased, while high selectivity could be obtained at low pyrolytic temperatures. Such a trend was also observed as the AC-to-WS ratio continuously increased. The alkylphenols production achieved a maximal yield of 44.19 mg/g with the corresponding selectivity of 34.7% at the pyrolytic temperature of400°C and AC-to-WS ratio of 3, compared with those of only 4.67 mg/g and 6.1% without catalyst. In addition, the possible formation mechanism of alkylphenols was also proposed with the catalysis of N/WSAC.

烷基酚是一组有价值的酚化合物，可以衍生自木质纤维素生物质。在这项研究中，准备了三种活性炭（ACs）用于核桃壳的催化快速热解（CFP）以生产烷基酚，包括氮掺杂的核桃壳衍生的活性炭（N / WSAC），氮掺杂的稻壳衍生的活性炭。碳（N / RHAC）和核桃壳衍生的活性炭（WSAC）。进行了热解气相色谱/质谱（Py-GC / MS）实验，揭示了AC类型，热解温度和AC /核桃壳比（AC / WS）对产品分布的影响。结果表明，通过氮掺杂，N / WSAC的烷基酚生产能力强于WSAC，此外，N / WSAC的烷基酚制备能力也优于N / RHAC。在N / WSAC的催化下，烷基酚的产率显着提高，尤其是酚，甲酚和4-乙基酚。随着热解温度的升高，烷基酚的收率先增加后降低，而在低热解温度下可获得较高的选择性。随着AC与WS的比率不断增加，也观察到了这种趋势。在400°C的热解温度和AC / WS比为3的情况下，烷基酚的最大产量为44.19 mg / g，相应的选择性为34.7％，相比之下，只有4.67 mg / g和6.1％的无催化剂。另外，在N / WSAC催化下，还提出了烷基酚的可能形成机理。随着热解温度的升高，烷基酚的收率先增加后降低，而在低热解温度下可获得较高的选择性。随着AC与WS的比率不断增加，也观察到了这种趋势。在400°C的热解温度和AC / WS比为3的情况下，烷基酚的最大产量为44.19 mg / g，相应的选择性为34.7％，相比之下，只有4.67 mg / g和6.1％的无催化剂。另外，在N / WSAC催化下，还提出了烷基酚的可能形成机理。随着热解温度的升高，烷基酚的收率先增加后降低，而在低热解温度下可获得较高的选择性。随着AC与WS的比率不断增加，也观察到了这种趋势。在400°C的热解温度和AC / WS比为3的情况下，烷基酚的最大产量为44.19 mg / g，相应的选择性为34.7％，相比之下，只有4.67 mg / g和6.1％的无催化剂。此外，在N / WSAC催化下，还提出了可能的烷基酚形成机理。在400°C的热解温度和AC / WS比为3的情况下，烷基酚的最大产量为44.19 mg / g，相应的选择性为34.7％，相比之下，只有4.67 mg / g和6.1％的无催化剂。另外，在N / WSAC催化下，还提出了烷基酚的可能形成机理。在400°C的热解温度和AC / WS比为3的情况下，烷基酚的最大产量为44.19 mg / g，相应的选择性为34.7％，相比之下，只有4.67 mg / g和6.1％的无催化剂。另外，在N / WSAC催化下，还提出了烷基酚的可能形成机理。