TY - JOUR
T1 - Steam reforming of acetic acid over nickel-based catalysts
T2 - the intrinsic effects of nickel precursors on behaviors of nickel catalysts
AU - Yu, Zhenjie
AU - Hu, Xun
AU - Jia, Peng
AU - Zhang, Zhanming
AU - Dong, Dehua
AU - Hu, Guangzhi
AU - Hu, Song
AU - Wang, Yi
AU - Xiang, Jun
N1 - Funding Information:
This work was supported by the Strategic International Scientific and Technological Innovation Cooperation Special Funds of National Key R&D Program of China (No. 2016YFE0204000 ), the Program for Taishan Scholars of Shandong Province Government , the Recruitment Program of Global Young Experts (Thousand Youth Talents Plan) , Natural Science Fund of Shandong Province ( ZR2017BB002 ) and the Foundation of State Key Laboratory of Coal Combustion .
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/12/5
Y1 - 2018/12/5
N2 - The paper investigated the effects of various nickel precursors (Ni(NO3)2, NiCl2, NiSO4, Ni(CH3COO)2, Ni(NH2SO3)2) on the catalytic behaviors of Ni/Al2O3 catalysts in steam reforming of acetic acid, aiming to understand the fundamental influences of nickel metal precursors. The catalysts were characterized with TPR, TPO, TPR-MS, TPO-MS, XRD, TG-MS, FT-IR, FT-Raman, BET method, element analysis, TEM and SEM. The results revealed the substantial influence of the nickel precursors on properties of Ni/Al2O3 catalysts. The use of NiSO4 and Ni(NH2SO3)2 as nickel precursors led to the low activities of the catalysts, due to the formation of Ni3S2 during reduction of the catalysts with hydrogen. The sulfur species were removed in the form of SO2 during the calcination of the catalysts precursors in air and in the form of H2S during the reduction of the calcined catalyst in hydrogen. NiCl2/Al2O3 catalyst showed a negligible activity as the chlorine poisoned the catalyst and was difficult to be removed via calcination. Furthermore, chlorine could accelerate sintering of alumina. In comparison, Ni(CH3COO)2 as nickel precursor could effectively suppress the formation of NiAl2O4. Ni(CH3COO)2/Al2O3 catalyst showed comparable activity to that of Ni(NO3)2/Al2O3, but the resistivity towards coking was higher. In addition, the coke species produced over the catalysts have both large and small aromatic ring systems with the morphology of both amorphous and fibrous structures.
AB - The paper investigated the effects of various nickel precursors (Ni(NO3)2, NiCl2, NiSO4, Ni(CH3COO)2, Ni(NH2SO3)2) on the catalytic behaviors of Ni/Al2O3 catalysts in steam reforming of acetic acid, aiming to understand the fundamental influences of nickel metal precursors. The catalysts were characterized with TPR, TPO, TPR-MS, TPO-MS, XRD, TG-MS, FT-IR, FT-Raman, BET method, element analysis, TEM and SEM. The results revealed the substantial influence of the nickel precursors on properties of Ni/Al2O3 catalysts. The use of NiSO4 and Ni(NH2SO3)2 as nickel precursors led to the low activities of the catalysts, due to the formation of Ni3S2 during reduction of the catalysts with hydrogen. The sulfur species were removed in the form of SO2 during the calcination of the catalysts precursors in air and in the form of H2S during the reduction of the calcined catalyst in hydrogen. NiCl2/Al2O3 catalyst showed a negligible activity as the chlorine poisoned the catalyst and was difficult to be removed via calcination. Furthermore, chlorine could accelerate sintering of alumina. In comparison, Ni(CH3COO)2 as nickel precursor could effectively suppress the formation of NiAl2O4. Ni(CH3COO)2/Al2O3 catalyst showed comparable activity to that of Ni(NO3)2/Al2O3, but the resistivity towards coking was higher. In addition, the coke species produced over the catalysts have both large and small aromatic ring systems with the morphology of both amorphous and fibrous structures.
KW - Acetic acid
KW - Catalyst properties
KW - Coke properties
KW - Nickel precursors
KW - Steam reforming
UR - http://www.scopus.com/inward/record.url?scp=85048415979&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2018.06.020
DO - 10.1016/j.apcatb.2018.06.020
M3 - Article
AN - SCOPUS:85048415979
SN - 0926-3373
VL - 237
SP - 538
EP - 553
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -