Synthesis of dimethylamine by zeolite rho: A rational basis for selectivity

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90024-E· OSTI ID:5536907

Abrams, L; Corbin, D R; Keane, M Jr ^[1]

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1. E.I. du Pont de Nemours and Co., Inc., Wilmington, DE (USA)

The sorption of trimethylamine by zeolite rho was studied to provide a rational basis of catalyst selectivity for the methylamines synthesis reaction from ammonia and methanol. Sorption kinetics, obtained for the range 150-250{degrees}C, yield an activation energy of 9 kcal/mole. Mass spec data indicate that trimethylamine is both physisorbed and chemisorbed with relative amounts of 10 and 90%, respectively. The physisorbed entity desorbs intact while, above 300{degree}C, the chemisorbed trimethylamine pyrolyzes forming mono- and dimethylamines plus some residue. For a given zeolite rho sample, the yield of trimethylamine in the methylamines synthesis reaction was found to correlate with the quantity of physisorbed trimethylamine. For zeolite rho catalysts, an activation energy of 42 kcal/mole was determined for the appearance of trimethylamine in the product stream.

• OSTI ID: 5536907
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 126:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
102000* -- Synthetic Fuels-- Products & By-Products-- (1990-)
ACTIVATION ENERGY
ALCOHOLS
AMINES
AMMONIA
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
DESORPTION
ENERGY
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MASS SPECTROSCOPY
MATERIALS
METHANOL
METHYLAMINE
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE DEPENDENCE
ZEOLITES