Coke formation and its effects on shape selective adsorptive and catalytic properties of ferrierite

Journal Article · Thu Jan 12 04:00:00 EST 1995 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100002a045· OSTI ID:6868511

Xu, W Q; Yin, Y G; Suib, S L ^[1]; O'Young, C L ^[2]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Texaco Inc., Beacon, NY (United States)

Channels or cavities of ferrierite are blocked by carbonaceous deposits (coke) which are formed during butene treatments. The pore blocking inside ferrierite/alumina catalysts affects the yield and selectivity to isobutylene in the catalytic reaction of butene isomerization. Pore size distribution experiments show that the blocking of 10-member ring channels (4.2 x 5.4 A) and 8-member ring channels (3.5 x 4.8 A) of ferrierite by coke reduces the channel size smaller than that of the nitrogen molecule (4.09 A). TPD data show that ammonia uptake for coked samples of different times on stream is decreased from about 62% to 35% of that for the fresh sample. Uptakes for more bulky molecules such as 1-butene (2.99 x 4.71 A) and isobutylene (3.28 x 4.14 A) are severely reduced by coke formation (< 9% of 1-butene and isobutylene uptakes for the fresh sample). About 76.9% of the coke formed after 18 h is deposited inside the micropores (< 10 A) of ferrierite/alumina. Modification of pore shapes through such coke deposition favors reactions involving small molecules, such as butene isomerization to isobutylene. 45 refs., 12 figs., 4 tabs.

• OSTI ID: 6868511
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 99:2; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

2-METHYLPROPENE
36 MATERIALS SCIENCE
360200 -- Ceramics
Cermets
&amp; Refractories
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ADSORPTION
ALKENES
AMMONIA
BUTENES
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
COMBUSTION
DATA
DEPOSITS
EXPERIMENTAL DATA
FOULING
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
KINETICS
MATERIALS
MICROSTRUCTURE
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
PORE STRUCTURE
REACTION KINETICS
SILICATE MINERALS
SORPTION
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
ZEOLITES