Journal ArticleDOI
Surface Species Formed and Their Reactivity during the Alkylation of Toluene by Methanol and Dimethyl Ether on Zeolites As Determined by in Situ 13C MAS NMR
Irina I. Ivanova,Avelino Corma +1 more
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In this paper, the mechanism of toluene alkylation with methanol (MeOH) or dimethyl ether (DME) at 433 K over H−ZSM-11 catalyst was investigated.Abstract:
13C MAS NMR has been performed in situ to investigate the mechanism of toluene alkylation with methanol (MeOH) or dimethyl ether (DME) at 433 K over H−ZSM-11 catalyst. The reaction protocol used al...read more
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Acid-catalyzed synthesis of mono- and dialkyl benzenes over zeolites: active sites, zeolite topology, and reaction mechanisms
Jiří Čejka,Blanka Wichterlová +1 more
TL;DR: In this article, a review of catalytic reactions leading to mono-and dialkyl benzenes over zeolites is presented, with an emphasis on the effect of the type of acid sites, zeolite structure, and reaction conditions on the activity and selectivity of these complex reactions.
Journal ArticleDOI
Selective Carbonylation of Dimethyl Ether to Methyl Acetate Catalyzed by Acidic Zeolites
TL;DR: Methanol carbonylation is currently used to produce acetic acid with Rh and Ir organometallic complexes and iodide cocatalysts to form carboxylic acids and esters.
Journal ArticleDOI
Quantum chemical modeling of zeolite-catalyzed methylation reactions: toward chemical accuracy for barriers.
TL;DR: Enthalpy barriers can be calculated with near chemical accuracy, which constitutes significant progress in the quantum chemical modeling of reactions in heterogeneous catalysis in general and microporous zeolites in particular.
Journal ArticleDOI
Specificity of Sites within Eight-Membered Ring Zeolite Channels for Carbonylation of Methyls to Acetyls
TL;DR: Such specificity of methyl reactivity upon confinement within small channels appears to be unprecedented in catalysis by microporous solids, which typically select reactions by size exclusion of bulkier transition states.
Journal ArticleDOI
Increasing para-Xylene Selectivity in Making Aromatics from Methanol with a Surface-Modified Zn/P/ZSM-5 Catalyst
TL;DR: In this paper, a ZSM-5 based catalyst with surface modification of SiO2 was used to increase the selectivity of para-xylene in xylene (X) in the methanol-to-aromatics process.
References
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Journal ArticleDOI
Selective alkylation of toluene with methanol to produce para-xylene
TL;DR: In this paper, a controlled reduction in the effective dimensions of the catalyst pore openings, and/or channels, along with deactivation of acidic surface sites, has been proposed as a mechanism for the selective production of p-xylene.
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Shape selective reactions with zeolite catalysts: III. Selectivity in xylene isomerization, toluene-methanol alkylation, and toluene disproportionation over ZSM-5 zeolite catalysts
TL;DR: In this article, data were presented for para-selective and nonselective formation of xylenes from alkylation of toluene with methanol and disproportionation over ZSM-5 class zeolite catalysts.
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Para-directed aromatic reactions over shape-selective molecular sieve zeolite catalysts
Journal ArticleDOI
Molecular shape selective catalysis
TL;DR: In this article, the authors proposed a method for shape selective catalysis in the intracrystalline space of siliceous zeolites, using diffusional mass transport dynamics and steric modification of the intrinsic reaction rates.
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In situ FTIR studies of methanol and dimethyl ether in ZSM-5
T. R. Forester,Russell F. Howe +1 more
TL;DR: In situ infrared spectra of methanol and dimethyl ether in H-ZSM-5 and Na-Z SM-5 were reported in this paper, showing that methanol reacts with internal acidic hydroxyl groups at 523 K to form a methoxy species correlated with the onset of hydrocarbon formation.