Aromatization of methane on Mo modified zeolites: Influence of the surface and structural properties of the carriers

Smiešková, Agáta; Hudec, Pavol; Kumar, Narendra; Salmi, T.; Murzin, Dmitry Yu.; Jorı́k, Vladimı́r

doi:10.1016/j.apcata.2010.01.021

Cited by 34 publications

(11 citation statements)

References 27 publications

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“…Note that the zeolite channels are certainly involved in the formation of aromatics in the title reaction [34][35][36][37]. This slow deactivation must result from coke accumulation at the channel mouths and/or inside the channels [38][39][40][41][42].…”

Section: Resultsmentioning

confidence: 97%

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

Song

Suzuki

et al. 2015

Journal of Catalysis

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Section: Resultsmentioning

confidence: 97%

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

Song

Suzuki

et al. 2015

Journal of Catalysis

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“…[1][2][3][4][5][6][7][8][9][10][11][12] However, industrialization of this reaction encounters a serious bottleneck of rapid deactivation of the catalyst due to coking. [1][2][3][4][5][6][7][8][9][10][11][12] However, industrialization of this reaction encounters a serious bottleneck of rapid deactivation of the catalyst due to coking.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Fe additive improving the activity stability of microzeolite-based Mo/HZSM-5 catalyst in non-oxidative methane dehydroaromatization at 1073 K under periodic CH₄–H₂switching modes

Song

Suzuki

et al. 2014

Catal. Sci. Technol.

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ARTICLE This journal isThe catalytic stabilities of Fe-modified and -unmodified 5%Mo/HZSM-5 catalysts in the non-oxidative methane dehydroaromatization were compared at 1073 K and three reaction/H 2 -regeneration cycle periods: 5 min CH 4 -5 min H 2 , 5 min CH 4 -10 min H 2 , and 5 min CH 4 -20 min H 2 . Fe addition proved capable of remarkably increasing the catalyst stability over the cycles of 5 min CH 4 -20 min H 2 but hardly effective over the cycles of 5 min CH 4 -5 min H 2 . On the other hand, SEM observation of all spent samples revealed that Fe addition causes a massive accumulation of carbon nanotubes under the latter cyclic condition but little at the former. Thus several sets of comparative tests were specially designed and performed to get insight into the rule of Fe-catalyzed cyclic formation of carbon nanotubes in stabilizing the activity at the cyclic condition of 5 min CH 4 -20 min H 2 . The results further confirmed that at this condition cyclic formation of carbon nanotubes enhances cyclic evolution of H 2 and makes the H 2 concentration of the system higher, which is thermodynamically beneficial for suppression of formation of the activity-deactivating surface coke. Finally, it was further confirmed that at least a 20 min H 2 exposure is required to remove most of the carbon nanotubes and surface coke formed during a 5 min CH 4 exposure and make most of Fe nanoparticles reactivated and available again for catalytic carbon nanotubes formation with an enhanced H 2 evolution, i.e., with a controlled formation of the surface coke in the next CH 4 exposure.

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“…The results showed a good 533 correlation, the C 5+ hydrocarbons selectivity was raised from 13 to 534 25% whereas the selectivity of lighter C 1 -C 4 hydrocarbons was 535 suppressed from 83 to 72%. Mo 2 C modified zeolite catalysts are 536 known for good aromatization activity due to a combination of 537 structure-acidity and bifunctional properties for enhancing 538 dehydrocyclization process [102][103][104][105]. The work of Zhang et al 539 [95] employed a bimetallic Cu-Ce/H-ZSM-5 catalyst, with the 540 metals incorporated via sequential impregnation.…”

mentioning

confidence: 99%

Zeolite catalysts in upgrading of bioethanol to fuels range hydrocarbons: A review

Galadima

Muraza

2015

Journal of Industrial and Engineering Chemistry

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Aromatization of methane on Mo modified zeolites: Influence of the surface and structural properties of the carriers

Cited by 34 publications

References 27 publications

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

Mechanism of Fe additive improving the activity stability of microzeolite-based Mo/HZSM-5 catalyst in non-oxidative methane dehydroaromatization at 1073 K under periodic CH₄–H₂switching modes

Zeolite catalysts in upgrading of bioethanol to fuels range hydrocarbons: A review

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Aromatization of methane on Mo modified zeolites: Influence of the surface and structural properties of the carriers

Cited by 34 publications

References 27 publications

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

The distribution of coke formed over a multilayer Mo/HZSM-5 fixed bed in H2 co-fed methane aromatization at 1073 K: Exploration of the coking pathway

Mechanism of Fe additive improving the activity stability of microzeolite-based Mo/HZSM-5 catalyst in non-oxidative methane dehydroaromatization at 1073 K under periodic CH4–H2switching modes

Zeolite catalysts in upgrading of bioethanol to fuels range hydrocarbons: A review

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Mechanism of Fe additive improving the activity stability of microzeolite-based Mo/HZSM-5 catalyst in non-oxidative methane dehydroaromatization at 1073 K under periodic CH₄–H₂switching modes