文献类型：期刊文献

英文题名：Catalytic self-activation of Ca-doped coconut shell for in-situ synthesis of hierarchical porous carbon supported CaO transesterification catalyst

作者：Sun, Hao[1,3] Sun, Kang[1] Wang, Fei[1] Liu, Yanyan[1] Ding, Linfei[2] Xu, Wei[1] Sun, Yunjuan[1] Jiang, Jianchun[1,3]

第一作者：孙昊

通信作者：Sun, YJ[1];Jiang, JC[1]|[a00050e3bed1ecb4a1908]孙云娟;

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Jiangsu Key Lab Biomass Energy & Mat, Key & Open Lab Forest Chem Engn,SFA,Natl Engn Lab, Nanjing 210042, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Adv Anal & Testing Ctr, Nanjing 210042, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry New Technol, Beijing 100091, Peoples R China

年份：2021

卷号：285

外文期刊名：FUEL

收录：;EI(收录号：20203809214203);Scopus(收录号：2-s2.0-85091103811);WOS:【SCI-EXPANDED(收录号:WOS:000588132400138)】；

基金：This work was financially supported by Jiangsu Key Laboratory for Biomass Energy and Material (JSBEM-S-201910 and JSBEM-S-201506), Natural Science Foundation of Jiangsu Province (BK2020020983), National Natural Science Foundation of China (31770629) and National Nonprofit Institute Research Grant of CAFINT (CAFYBB2018SZ011).

语种：英文

外文关键词：Hierarchical activated carbon; Catalytic self-activation; In-situ; Transesterification; Mesopore

摘要：This study reports a one-step facile synthesis of a novel heterogeneous granule base catalyst, dubbed CaO/AC that contains small calcium oxide (CaO) nanoparticles embedded within hierarchical activated carbon (AC). The CaO/AC hybrid exhibited a 98.59 wt% fatty acid methyl esters yield, with 89.75% less catalyst compared to pristine CaO. In addition, the CaO/AC granular catalyst, which was easily recovered without any post-treatment, presented sustainable catalytic activity after two cycles of transesterification. The calcium cations penetrated into the cell wall of coconut shell by vacuum impregnation, and the carbonization of cell wall suppressed the agglomeration of calcium compound, which was essential for the catalytic self-activation of Ca-doped coconut shell. The pyrolysis atmosphere and dwelling time were investigated to demonstrate the dual function of calcium. Owing to the catalytic effect of Ca during the self-activation process, the hierarchical activated carbon with improved mesopores was manufactured. On the other hand, CaO nanoparticles with an average size of 14.7 nm were in-situ encapsulated within the mesopores of hierarchical carbon matrices. The additional formation of mesopores and high dispersion of CaO nanoparticles were responsible for the enhanced inner mass transfer and the number of accessible alkaline sites in transesterification of triglycerides, leading to the high catalytic activity and stability of CaO/AC.