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Oxidative coupling of methane by Mn-Na_(2)WO_(4) /γ-Al_(2)O_(3) catalyst: effect of Mn/W ratio

Frontiers of Chemical Science and Engineering 2024年第1期18卷 1-11页

作者： hasan oliaei torshizi Ali Nakhaei Pour Alireza Salimi Melika Ghadamyari Department of Chemistry Faculty of ScienceFerdowsi University of MashhadMashhad ***Iran

In this study,Mn-Na_(2)WO_(4)/γ-Al_(2)O_(3) catalysts with varying ratios of Mn/W were prepared using the dry impregnation *** catalysts were then tested for their suitability in the oxidative coupling of methane *** X-ray photoelectron results revealed the presence of the tetrahedral WO_(4)^(2–)phase in all prepared *** is believed that the presence of this phase is associated with high catalyst activity,indicating the potential of the catalysts for the desired *** activity results show that the catalyst with a high Mn/W ratio exhibited higher activity at 800℃,whereas the catalyst with a low Mn/W ratio showed greater activity at 850℃.This suggests that the Mn/W ratio influences the reaction temperature at which the catalyst is most ***,the X-ray diffraction results of the treated catalysts revealed that the catalyst with a high Mn/W ratio exhibited more MnAl_(2)O_(4) at 800℃,whereas the catalyst with a low Mn/W ratio contained more MnWO_(4) at 850℃.The results suggest that the presence of MnAl_(2)O_(4) sites may promote a more facile Mn^(2+)↔Mn^(3+)cycle at lower temperatures than the MnWO_(4) site,potentially contributing to the enhanced catalyst activity in the oxidative coupling of methane reaction at 800℃.

关键词： oxidative ecoupling ofmethane Mn-Na WO_(4) methane Al_(2)O_(3)

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Fischer-Tropsch synthesis by reduced graphene oxide nanosheets supported cobalt catalysts: role of support and metal nanoparticle size on catalyst activity and products selectivity

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 299-309页

作者： hasan oliaei torshizi Ali Nakhaei Pour Ali Mohammadi Yahya Zamani Seyed Mehdi Kamali Shahri Department of Chemistry Faculty of ScienceFerdowsi University of MashhadMashhad ***Iran Gas Research Division Research Institute of Petroleum IndustryTehran ***Iran Department of Chemical Engineering Pennsylvania State UniversityState CollegePA 16801USA

In this paper,a series of cobalt catalysts supported on reduced graphene oxide(rGO)nanosheets with the loading of 5,15 and 30 wt-%were provided by the impregnation *** activity of the prepared catalysts is evaluated in the Fischer-Tropsch synthesis(FTS).The prepared catalysts were carefully characterized by nitrogen adsorption-desorption,hydrogen chemisorption,X-ray diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,temperature programmed reduction,transmission electron microscopy,and field emission scanning electron microscopy techniques to confirm that cobalt particles were greatly dispersed on the rGO *** results showed that with increasing the cobalt loading on the rGO support,the carbon defects are increased and as a consequence,the reduction of cobalt is *** FTS activity results showed that the cobalt-time yield and turnover frequency passed from a maximum for catalyst with the Co0 average particle size of 15 nm due to the synergetic effect of cobalt reducibility and particle *** products selectivity results indicated that the methane selectivity decreases,whereas the C5+selectivity raises with the increasing of the cobalt particle size,which can be explained by chain propagation in the primary chain growth reactions.

关键词： cobalt catalyst cobalt particle size Fischer-Tropsch synthesis reduced graphene oxide supported catalyst

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