TY - JOUR
T1 - Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization
T2 - A study of the effect of pretreatment and metal loadings on the catalytic behavior
AU - Sridhar, Apoorva
AU - Rahman, Mustafizur
AU - Infantes-Molina, Antonia
AU - Wylie, Benjamin J.
AU - Borcik, Collin G.
AU - Khatib, Sheima J.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/5
Y1 - 2020/1/5
N2 - Methane dehydroaromatization is studied using different loadings (0.2 wt%, 0.6 and 1 wt%) of Co and Ni additives on a 6 wt% Mo/ZSM-5 catalyst to evaluate the promoting effect of Ni and Co on reactivity and stability of the catalysts. A synergy between Mo and the additives is observed when combining a reduction/carburization pretreatment with an optimum additive loading: benzene yield and catalytic stability are both improved. The fresh and spent samples were characterized by X-Ray Diffraction, 27Al Magic-Angle Spinning Solid State Nuclear Magnetic Resonance Spectroscopy, Temperature-Programmed Reduction and Thermogravimetric Analysis. The results suggest that catalytic enhancement in precarburized Mo-Co and Mo-Ni samples is due to a combination of effects: extraction of Al from the ZSM-5 framework to form inactive Al2(MoO4)3 is reduced, interaction of Mo with the additives enhances the retention of Mo species within the zeolite channels, prevents Mo aggregation in reaction and modifies the reducibility of the Mo sites.
AB - Methane dehydroaromatization is studied using different loadings (0.2 wt%, 0.6 and 1 wt%) of Co and Ni additives on a 6 wt% Mo/ZSM-5 catalyst to evaluate the promoting effect of Ni and Co on reactivity and stability of the catalysts. A synergy between Mo and the additives is observed when combining a reduction/carburization pretreatment with an optimum additive loading: benzene yield and catalytic stability are both improved. The fresh and spent samples were characterized by X-Ray Diffraction, 27Al Magic-Angle Spinning Solid State Nuclear Magnetic Resonance Spectroscopy, Temperature-Programmed Reduction and Thermogravimetric Analysis. The results suggest that catalytic enhancement in precarburized Mo-Co and Mo-Ni samples is due to a combination of effects: extraction of Al from the ZSM-5 framework to form inactive Al2(MoO4)3 is reduced, interaction of Mo with the additives enhances the retention of Mo species within the zeolite channels, prevents Mo aggregation in reaction and modifies the reducibility of the Mo sites.
KW - 6 wt% Mo/HZSM-5
KW - Benzene
KW - Co-modified Mo catalysts
KW - Co-modified Mo catalysts
KW - Methane dehydroaromatization
KW - Regeneration
UR - http://www.scopus.com/inward/record.url?scp=85074695395&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2019.117247
DO - 10.1016/j.apcata.2019.117247
M3 - Article
AN - SCOPUS:85074695395
SN - 0926-860X
VL - 589
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
M1 - 117247
ER -