Methanol synthesis catalysts based on Cs/Cu/ZnO/M sub 2 O sub 3 (M = Al, Cr, Ga): Genesis from coprecipitated hydrotalcite-like precursors, solid-state chemistry, morphology, and stability

Journal Article · Wed Oct 04 00:00:00 EDT 1989 · Inorganic Chemistry; (USA)

DOI:https://doi.org/10.1021/ic00319a023· OSTI ID:6991318

Nunan, J G; Himelfarb, P B; Herman, R G; Klier, K; Bogdan, C E; Simmons, G W ^[1]

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1. Lehigh Univ., Bethlehem, PA (USA)

The formation, decomposition, and reconstitution of hydrotalcite-like hydroxy carbonates (Cu{sub 0.4}Zn{sub 0.6}){sub 6}M{sub 2}(OH){sub 16}CO{sub 3}{center dot}4H{sub 2}O (M = Al, Cr, Ga) have been studied to determine the causes of the high long-lasting catalytic activity (M = Cr) and the severe deactivation (M = Al, Ga) of the Cu/ZnO/M{sub 2}O{sub 3} method synthesis catalysts doped with cesium after thermal decomposition of the hydrotalcite-like precursors. The alumina-based (M = Al) and gallia-based (M = Ga), but not the chromia-based (M = Cr), CuO/ZnO/M{sub 2}O{sub 3} mixed oxides that were produced by thermal treatment at 623 K of the hydrotalcite-like compounds reconstituted the original hydrotalcite-type compounds during the aqueous doping procedure carried out with the cesium formate promoter, CsOOCH. The re-formation of the Al- and Ga-containing catalysts to their hydrotalcite-like precursors is due to incomplete decomposition of the hydroxy carbonates prior to doping. Electron diffraction and transmission electron microscopy give evidence for the reconstitution reactions. The alkali-metal-promoted methanol synthesis catalyst of choice from hydrotalcite-type precursors is based on chromia. 27 refs., 13 figs., 4 tabs.

• DOE Contract Number: AC22-84PC70021
• OSTI ID: 6991318
• Journal Information: Inorganic Chemistry; (USA), Vol. 28:20; ISSN 0020-1669
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CESIUM
CHROMIUM OXIDES
COPPER
GALLIUM OXIDES
METHANOL
SYNTHESIS
ZINC OXIDES
CATALYSIS
DOPED MATERIALS
EXPERIMENTAL DATA
MORPHOLOGY
ALCOHOLS
ALKALI METALS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
DATA
ELEMENTS
GALLIUM COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
MATERIALS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC COMPOUNDS
090900* - Biomass Fuels- Processing- (1990-)