Effect of pyridine poisoning on the kinetics of thiophene hydrogenolysis and hexene hydrogenation

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90277-0· OSTI ID:5462118

Massoth, F E; Miciukiewicz, J

The kinetics of deactivation of thiophene hydrodesulfurization and hexene hydrogenation by pyridine poisoning was studied in a flow microbalance reactor, which allowed simultaneous measurements of pyridine adsorption and reaction rates. The pyridine adsorption data obeyed a modified Temkin isotherm implying a distribution of adsorption sites. The deactivation kinetics could not be correlated with a reversible (rapid) pyridine adsorption model. A quasiirreversible model correlated the data very well. In this model, the rates of adsorption and desorption of pyridine are relatively slow compared to reaction rates. Thus, its effect on catalytic activity is reflected in a quasipermanent poisoning of active sites, lowering the reaction rate constant, rather than in a reversible competitive adsorption for active sites. Furthermore, it is deduced that the number of catalytically active sites is small compared to the total adsorption sites. 19 references.

• Research Organization: Univ. of Utah, Salt Lake City
• OSTI ID: 5462118
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 101:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
ADSORPTION ISOTHERMS
ALKENES
AZINES
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEACTIVATION
DESORPTION
DESULFURIZATION
HETEROCYCLIC COMPOUNDS
HEXENES
HYDROCARBONS
HYDROGENATION
ISOTHERMS
KINETICS
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POISONING
PYRIDINE
PYRIDINES
REACTION KINETICS
SORPTION
THIOPHENE