Surface properties of offretite and ZSM-34 zeolites

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5864629

Occelli, M L; Innes, R A; Apple, T M; Gerstein, B C

Offretite and ZSM-34 zeolites, with nominally the same crystal structure, have been synthesized and their catalytic behavior toward conversion of methanol to hydrocarbons determined. ZSM-34 is found to be highly selective toward conversion to ethylene relative to offretite. Calcination of the two zeolites during removal of the quanternary ammonium cation has been monitored by TGA, DSC, and FTIR. Crystallinity, crystal size, and morphology were studied by powder x-ray diffraction and scanning electron microscopy. Acidities of Bronsted acid sites were monitored by adsorption of pyridine and by observation of changes of infrared spectra with heating and pumping. A variety of experiments on NMR of protons at 220 MHz were performed before and after ammonium and calcination. Possible identities of the protonic species being observed are discussed. Proton spin counting indicates that for the samples of highest crystallinity, residual proton levels after calcination, either before or after ammonium exchange, are consistent with complete decomposition of the quaternary ammonium cation and with complete decomposition of the ammonium cation.

• Research Organization: Gulf Research and Development Co., Pittsburgh, PA (USA); Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5864629
• Report Number(s): IS-M-415; CONF-830756-9; ON: DE83016211
• Country of Publication: United States
• Language: English

Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
AMINES
AMMONIUM COMPOUNDS
BARYONS
CALCINATION
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CONVERSION
DECOMPOSITION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYDROCARBONS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIALS
METHANOL
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUCLEONS
ORGANIC COMPOUNDS
PRODUCTION
PROTONS
PYROLYSIS
QUATERNARY COMPOUNDS
RESONANCE
THERMOCHEMICAL PROCESSES
ZEOLITES