Abstract
Biochar is a reactive carrier as it may be partially gasified with steam in steam reforming,which could influence the formation of reaction intermediates and modify catalytic behaviors.Herein,the Ni/biochar as well as two comparative catalysts,Ni/Al2O3 and Ni/SiO2,with low nickel loading(2％(mass))was conducted to probe involvement of the varied carriers in the steam reforming.The results indicated that the Ni/biochar performed excellent catalytic activity than Ni/SiO2 and Ni/Al2O3,as the biochar carrier facilitated quick conversion of the-OH from dissociation of steam to gasify the oxygen-rich carbona-ceous intermediates like C=O and C-O-C,resulting in low coverage while high exposure of nickel species for maintaining the superior catalytic performance.In converse,strong adsorption of aliphatic intermediates over Ni/Al2O3 and Ni/SiO2 induced serious coking with polymeric coke as the main type(21.5％and 32.1％,respectively),which was significantly higher than that over Ni/biochar(3.9％).The coke over Ni/biochar was mainly aromatic or catalytic type with nanotube morphology and high crystallinity.The high resistivity of Ni/biochar towards coking was due to the balance between formation of coke and gasification of coke and partially biochar with steam,which created developed mesopores in spent Ni/biochar while the coke blocked pores in Ni/Al2O3 and Ni/SiO2 catalysts.
基金项目
National Natural Science Foundation of China(51876080)
Program for Taishan Scholars of Shandong Province Government()
Agricultural Innovation Program of Shandong Province(SD2019NJ015)
Research and Development program of Shandong Basan Graphite New Material Plant()
National Natural Science Foundation of China(52076097)
Key projects for intergovernmental cooperation in international science,technology and innovation(2018YFE0127500)
NETL
NSTL
万方数据