Acidity and catalytic activity of MeAPSO-44 (Me = Co, Mn, Cr, Zn, Mg), SAPO-44, AlPO[sub 4]-5, and AlPO[sub 4]-14 molecular sieves in methanol dehydration

Journal Article · Sun Jan 31 23:00:00 EST 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1030· OSTI ID:6235828

Hocevar, S; Batista, J; Kaucic, V ^[1]

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1. Hajdrihova 19, Ljubljana (Slovenia)

SAPO-44 and the isomorphously substituted MeAPSO-44 (Me = Co, Mn, Cr, Zn, Mg) molecular sieves have been synthesized. The temperature-programmed desorption (TPD) spectra and the reaction rates of methanol dehydration have been measured on these samples in comparison with AlPO[sub 4]-5 and AlPO[sub 4]-14 samples. The acidity strength of samples has been determined qualitatively from the temperatures of dimethylether desorption peaks, and the following sequence has been obtained: MnAPSO-44 > CoAPSO-44 [approx] ZnAPSO-44 > MgAPSO-44 > CrAPSO-44 > SAPO-44 [much gt] AlPO[sub 4]-5 [approx] AlPO[sub 4]-14. The following sequence of catalytic activity has been observed: AlPO[sub 4]-14 > AlPO[sub 4]-5 [approx] SAPO-44 > CoAPSP-44 > MnAPSP-44. The highest selectivity to ethene production among these catalysts has been found for CoAPSO-44. The selectivities to ethene of SAPO-44 and MeAPSO-44 (Me = Co, Mn, Cr) samples are about three times higher than the selectivities of SAPO-34 and MeAPSO-34 (Me = Co, Mn, Cr) samples. The selectivities of transition-metal-substituted MeAPSO-44 samples follow the Irving-Williams transition metal-ligand complex stability order. 20 refs., 8 figs., 7 tabs.

• OSTI ID: 6235828
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 139:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
ALCOHOLS
ALKALINE EARTH METAL COMPLEXES
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
CATALYSTS
CATALYTIC EFFECTS
CHROMIUM COMPLEXES
COBALT COMPLEXES
COMPLEXES
DEHYDRATION
DESORPTION
ETHERS
ETHYLENE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
LEWIS ACIDS
MAGNESIUM COMPLEXES
MANGANESE COMPLEXES
METHANOL
METHYL ETHER
MOLECULAR SIEVES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SORPTION
STABILITY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES
ZINC COMPLEXES