Methane conversion to valuable chemicals over nanostructured Mo/ZSM-5 catalysts

Исмагилов, З. Р.; Матус, Е. В.; Керженцев, М. А.; Цикоза, Л. Т.; Исмагилов, И.З.; Досумов, К.; Мустафин, А. Г.

doi:10.1134/s0965544111020058

Cited by 24 publications

(14 citation statements)

References 106 publications

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“…During last two decades several types of catalysts has been tested aiming an increase of catalyst activity, stability, and selectivity [2][3][4][5]. The most studied catalyst in MDA reaction is based on ZSM-5 zeolite modified by Mo.…”

Section: Introductionmentioning

confidence: 99%

Effect of addition of a second metal in Mo/ZSM-5 catalyst for methane aromatization reaction under elevated pressures

Fíla

Bernauer

et al. 2015

Catalysis Today

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Section: Introductionmentioning

confidence: 99%

Effect of addition of a second metal in Mo/ZSM-5 catalyst for methane aromatization reaction under elevated pressures

Fíla

Bernauer

et al. 2015

Catalysis Today

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“…Regarding the possible zeolites, the most adequate are those with structures containing pores of dimensions close to the dynamic diameter of benzene, the desired product9. Thus, ZSM-5 11,15,16 and MCM-22 11,[17][18][19][20][21] have been thoroughly studied, although other zeolite structures presenting 10-ring channels , such as IM-5 22,23 or TNU-9 24 , have also been recently described for this process. Regarding the reaction mechanism and the active sites involved, it is widely accepted that methane is first activated on the Mo sites and the reaction intermediates formed will further oligomerize, cyclate and dehydrogenate on the Brønsted acid sites.…”

Section: Introductionmentioning

confidence: 99%

Non-oxidative dehydroaromatization of methane: an effective reaction–regeneration cyclic operation for catalyst life extension

Portilla

Llopis²,

Martı́nez

2015

Catal. Sci. Technol.

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Non-oxidative methane aromatization is an attractive direct route for producing higher hydrocarbons, highly selective to benzene despite the low conversions due to thermodynamic limitations, and Mo/H-ZSM-5, the first catalyst proposed for this reaction, is still considered as one of the most adequate. The major problem of this process is the severe catalyst deactivation due to the rapid buildup of carbonaceous deposits on the catalysts.Here we present an effective regeneration procedure that extends the life of Mo/zeolite based catalysts by combining reaction periods of 1.5 h with 0.5 h regeneration steps in a continuous cyclic mode and methane activation after each regeneration stage. Benzene productivity obtained with Mo/ZSM-5 is shown to be almost constant for increasing TOS ranges when applying this new cyclic protocol, and threefold values are achieved for an 18 h on stream period by limiting the reaction steps to the first 1.5 h of maximum benzene selectivity (97 vs. 33 g benzene/kg cat·h) as compared to a conventional single run.

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“…The best catalyst is Mo/ZSM-5. The knowledge about this reaction has recently been reviewed by Xu et al 24 and Ismagilov et al 25,26 Their conclusions are summarized here: The selectivity towards C 6 H 6 and H 2 is higher without O 2 , due to the formation of total oxidation products in the presence of O 2 .…”

Section: Dehydroaromatizationmentioning

confidence: 94%