Methane conversion into aromatic hydrocarbons over Ag-Mo/ZSM-5 catalysts

Восмериков, А. В.; Зайковский, В. И.; Коробицына, Л. Л.; Козлов, В. В.; Arbuzova, N. V.; Журавков, С. П.

doi:10.1134/s0023158411030190

Cited by 5 publications

(9 citation statements)

References 8 publications

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“…The variation of the chemical composition of Мо/ZSM-5 catalysts by the introduction of modifying additives is one of the most effective approaches to improve the process of methane dehydroaromatization. In several works [82][83][84][85] it was shown that the presence of a second metal in addition to molybdenum, can have a substantial effect on the activity, selectivity, and resistance to the coking of Mo/ZSM-5 catalysts. A wide range of metals were studied as promoters: Fe [85][86][87], Co [86,88], Ni [83,89], Cu [88,90], Zn [87,91,92], Ga [93,94], Cr [95], Ag [84,96], Pd [97], Ir [97], V [98], Pt [99], Ru [100], La [101], P [102], etc.…”

Section: Dehydroaromatization Of Methanementioning

confidence: 99%

“…In several works [82][83][84][85] it was shown that the presence of a second metal in addition to molybdenum, can have a substantial effect on the activity, selectivity, and resistance to the coking of Mo/ZSM-5 catalysts. A wide range of metals were studied as promoters: Fe [85][86][87], Co [86,88], Ni [83,89], Cu [88,90], Zn [87,91,92], Ga [93,94], Cr [95], Ag [84,96], Pd [97], Ir [97], V [98], Pt [99], Ru [100], La [101], P [102], etc. The data on nature (Ni, Ti, Zr, W, Ru, La, Ce, platinum group metals, etc.)…”

Section: Dehydroaromatization Of Methanementioning

confidence: 99%

“…In [83][84][85] the results of the study of catalytic activity and stability of Мо/ZSM-5 catalysts promoted by nanosized powders (NSP) of Ag, Ni, and Fe are described. All samples were prepared by the method of solid-phase synthesis in a ball vibratory mill.…”

Section: Dehydroaromatization Of Methanementioning

confidence: 99%

“…The introduction of NSP of Ag (0.05-2.0%) into 4.0% Мо/ZSM-5 catalyst also leads to an increase in its activity and stability [84]. The highest values of the activity and stability are exhibited by With the growth of silver content in the catalytic system its dispersion changes because of the agglomeration of particles in the course of the reaction, which is accompanied by the blocking of the active Мо 2 С surface centers and zeolite channels where oxide-like molybdenum clusters are located as well as the acid sites of the zeolite [109].…”

Section: Tablementioning

confidence: 99%

“…Electron microscopy studies [84] show that the initial 0.1% Ag-4.0% Mo/ZSM-5 sample contains zeolite particles as a prevailing fraction and silver particles present as aggregates of micron sizes (Fig. 9).…”

Section: Tablementioning

confidence: 99%

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Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

Исмагилов

Восмериков

Коробицына

et al. 2021

Eurasian Chem. Tech. J.

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In this work, the introduction of modifying additives in the composition of catalysts is considered as an effective mode of improving functional characteristics of materials for two processes of methane conversion into valuable products – methane dehydroaromatization (DHA of CH4) into benzene and hydrogen and autothermal reforming of methane (ATR of CH4) into synthesis gas. The effect of type and content of promoters on the structural and electronic state of the active component as well as catalyst activity and stability against deactivation is discussed. For DHA of CH4 the operation mode of additives M = Ag, Ni, Fe in the composition of Mo-M/ZSM-5 catalysts was elucidated and correlated with the product yield and coke content. It was shown that when Ag serves as a promoter, the duration of the catalyst stable operation is enhanced due to a decrease in the rate of the coke formation. In the case of Ni and Fe additives, the Ni-Мо and Fe-Mo alloys are formed that retain the catalytic activity for a long time in spite of the carbon accumulation. For ATR of CH4, the influence of M = Pd, Pt, Re, Mo, Sn in the composition of Ni-M catalysts supported on La2O3 or Ce0.5Zr0.5O2/Al2O3 was elucidated. It was demonstrated that for Ni-M/La2O3 catalysts, Pd is a more efficient promoter that improves the reducibility of Ni cations and increases the content of active Nio centers. In the case of Ni-M/Ce0.5Zr0.5O2/Al2O3 samples, Re is considered the best promoter due to the formation of an alloy with anti-coking and anti-sintering properties. The use of catalysts with optimal promoter type and its content provides high efficiency of methane valorization processes.

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Section: Dehydroaromatization Of Methanementioning

confidence: 99%

Section: Dehydroaromatization Of Methanementioning

confidence: 99%

Section: Dehydroaromatization Of Methanementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

See 3 more Smart Citations

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

Исмагилов

Восмериков

Коробицына

et al. 2021

Eurasian Chem. Tech. J.

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Effect of the introduction of niobium carbide on non-oxidative dehydro-aromatization of methane over MoMCM-22

Rodrigues

Monteiro

2011

Reac Kinet Mech Cat

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Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

et al. 2014

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A MoSiBEA zeolite has been prepared by a two-step postsynthesis procedure that consists of first creating the vacant T-atom sites with associated silanol groups by treatment of TEABEA zeolite with nitric acid and then incorporating Mo ions into the vacant T-atom sites by solidstate ion exchange at 773 K using molybdenum(II) acetate. The incorporation of Mo ions into the vacant T-atom sites of the framework of SiBEA zeolite as isolated mononuclear Mo(VI) species was evidenced by the combined use of XRD and FTIR, NMR, and diffuse reflectance UV−visible spectroscopies. The consumption of OH groups was monitored by FTIR spectroscopy. The reducibility of Mo was investigated by TPR and EPR spectroscopy. The size of very small well-dispersed Mo(0) nanoparticles formed upon treatment of MoSiBEA between 298 and 1240 K in hydrogen stream (5% H 2 /Ar) was measured by TEM.

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Methane conversion into aromatic hydrocarbons over Ag-Mo/ZSM-5 catalysts

Cited by 5 publications

References 8 publications

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

Effect of the introduction of niobium carbide on non-oxidative dehydro-aromatization of methane over MoMCM-22

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV–Vis Spectroscopies

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