Catalytic fast pyrolysis of walnut shell for alkylphenols production with nitrogen-doped activated carbon catalyst  

作　　者：Shanwei Ma Hang Li Guan Zhang Tahir Iqbal Kai Li Qiang Lu 

机构地区：[1]State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China [2]Faculty of Agricultural Engineering&Technology,PMAS-Arid Agriculture University,Rawalpindi 46000,Pakistan

出　　处：《Frontiers of Environmental Science & Engineering》2021年第2期95-105,共11页环境科学与工程前沿（英文）

基　　金：the National Natural Science Foundation of China(Grant Nos.51922040 and 51821004);Grants from Fok Ying Tung Education Foundation(No.161051);Fundamental Research Funds for the Central Universities(Nos.2020DF01,2019QN002,and 2018ZD08)for financial support.

摘　　要：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 of 400℃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.

关 键 词：PYROLYSIS Walnut shell ALKYLPHENOLS Nitrogen-doped activated carbon 

分 类 号：O64[理学—物理化学]