文献类型：期刊文献

英文题名：Design of nitrogen-doped graphitized 2D hierarchical porous carbons as efficient solid base catalysts for transesterification to biodiesel

作者：Kong, Weiping[1];Liu, Fujian[1];Liu, Yong[2]

机构：[1]Shaoxing Univ, Dept Chem, Shaoxing, Peoples R China;[2]Henan Univ, Henan Key Lab Polyoxometalate Chem, Coll Chem & Chem Engn, Kaifeng 475004, Peoples R China

年份：2020

卷号：22

期号：3

起止页码：903

外文期刊名：GREEN CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000523465000027)、、EI(收录号：20200808192903)、Scopus(收录号：2-s2.0-85079491802)、WOS

基金：We acknowledge the financial support from the National Natural Science Foundation of China (grant no. 21573150).

语种：英文

外文摘要：Two-dimensional (2D) nanomaterials usually show good mass transportation and enhanced accessibility of located active sites in the areas of adsorption, separation and heterogeneous catalysis. We herein report nitrogen-decorated 2D hierarchical nanoporous carbonaceous (N-HPC-Ts) solid bases synthesized by one-step carbonization of a solid mixture of urea and chitosan. The N-HPC-Ts have large BET surface areas (202-641 m(2) g(-1)) and a partially graphitized carbon framework and show good hydrophobicity and enhanced wettability for organic compounds such as sunflower oil, methanol and benzaldehyde. Moreover, N-HPC-Ts have nitrogen concentrations up to 15.9 mmol g(-1) with a high ratio of pyridinic nitrogen (similar to 68.7%). Therefore, the N-HPC-Ts can be used as highly efficient and reusable solid bases in base-catalyzed reactions such as transesterification to produce biodiesel and Knoevenagel condensation to produce fine chemicals, and their activities are much better than many reported solid acid and base catalysts such as H3PW12O40, commercial Amberlite-400 base resin, hydrotalcite and CaO. To the best of our knowledge, there are still few reports on the direct use of 2D carbonaceous solid bases in catalyzing biodiesel production. The excellent activities of N-HPC-Ts benefit from their structural characteristics such as high concentrations of base sites, good wettability for various reactants and unique 2D hierarchical porous structures.