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Effect of Additives on Ni‐Based Catalysts for Hydrogen‐Enriched Production from Steam Reforming of Biomass
Author(s) -
Wang Xuetao,
Su Xiaoxin,
Zhang Qianwei,
Hu Haipeng
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000136
Subject(s) - catalysis , nickel , steam reforming , hydrogen production , inorganic chemistry , temperature programmed reduction , materials science , hydrogen , cobalt , lanthanum , chemistry , nuclear chemistry , chemical engineering , metallurgy , organic chemistry , engineering
The catalytic steam reforming of biomass for hydrogen production is investigated in a fixed‐bed reactor. A suitable additive and precursor is found in various additives (cobalt, strontium, and lanthanum) and nickel salt precursors (nickel nitrate, nickel acetate, nickel chloride, and nickel sulfate). Synthesized samples are characterized by X‐ray diffraction (XRD), NH 3 temperature‐programmed desorption (TPD), H 2 temperature‐programmed reduction (TPR), and transmission electron microscopy (TEM). Results show that Co and La doping of the Ni/Al 2 O 3 catalyst improves the dispersion of surface‐active particles and reduces the particle size, increasing H2 production. The hydrogen volume fraction of La‐modified catalysts with 10% Ni is 38.96%, which is higher than 30.39% for the unmodified Ni/Al 2 O 3 catalyst. The lowest hydrogen yield of Ni–Sr/Al 2 O 3 catalyst is 19.22%. This low catalytic activity is due to the reaction of Ni–Sr/Al 2 O 3 with SiO 2 found in biomass ash, which generates silicate without catalytic effect. The silicate melts and adheres to the catalyst surface at a high temperature, inhibiting the catalysis of nickel active sites. The maximum hydrogen yield obtained with nickel acetate as catalyst precursor is 51.41%, which is due to nickel acetate decomposing and forming more NiO in the amorphous state and improving the performance of catalyst.