Infrared diffuse reflectance study of the silicon-rich H-ZSM-5 catalysis of ethanol conversion

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90055-9· OSTI ID:7127212

Moser, W R; Chiang, C C; Thompson, R W ^[1]

---

1. Worcester Polytechnic Institute, MA (USA)

A new infrared diffuse reflectance reactor was used to study the in situ H-ZSM-5 catalyzed conversion of ethanol to high-purity ethylene between ambient temperature and 400 C. Zeolites having a Si/Al atom ratio of 35 to 126 adsorbed ethanol principally on aluminol acid sites, while silicon-rich materials of Si/Al greater than 500 adsorbed ethanol on both terminal silanol sites and intracrystalline hydrogen-bonded silanols. The silicon-rich materials demonstrated hydrogen-bonded silanol functionalities in their intracrystalline structures which became prominent as the silicon content increased. A portion of these silanols was removed from the infrared spectrum upon treatment with dilute sodium hydroxide demonstrating their acidity. The in situ infrared data showed that ethanol conversion to ethylene using zeolites of low Si/Al ratio utilized aluminum-based Bronsted acid sites while the activity of the silicon-rich materials was based on the hydrogenation-bonded silanols.

• OSTI ID: 7127212
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 115:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
102000* -- Synthetic Fuels-- Products & By-Products-- (1990-)
ALCOHOLS
ALKENES
ALUMINIUM
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL REACTIONS
ELEMENTS
ETHANOL
ETHYLENE
HYDROCARBONS
HYDROXY COMPOUNDS
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
REFLECTIVITY
REFORMER PROCESSES
SEMIMETALS
SILICON
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
ZEOLITES