Coking characteristics of reforming catalysts

Journal Article · Fri Aug 01 00:00:00 EDT 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90115-6· OSTI ID:5462072

Mieville, R L

Coking rates were measured for two different ..gamma..-aluminas, each with and without platinum, under near commercial conditions using a gravimetric reactor. Coke on catalyst was characterized by a Temperature-Programmed Oxidation (TPO) technique. With a naphtha feed, coke formed on both aluminas at rates related to the respective population of ..cap alpha..-sites as measured by IR. For the corresponding Pt on alumina catalysts, coke, as measured by TPO, predominantly formed on sites associated with alumina (alumina coke), while coke associated with Pt (Pt coke), was relatively minor. With a n-heptane feed, under the same conditions, coke formation on both aluminas was much less than with the naphtha feed. However, the corresponding Pt on alumina catalysts generated comparatively more coke with a higher proportion associated with Pt. A correspondence between this proportion of Pt coke and the decline in reforming activity was observed. It is postulated that most of the coke produced during naphtha reforming with an active catalyst is formed by a reaction between ..cap alpha..-sites on alumina and certain components in the feed via a polymerization mechanism. This type of coke has minimal effect on the reforming reactivity of the catalyst. However, in n-heptane reforming, about 50% of the coke also results from precursors formed from reactions with Pt. In either case, coke associated with Pt appears to be the probable cause of deactivation. 22 references.

• Research Organization: Amoco Oil Co., Naperville, IL
• OSTI ID: 5462072
• Journal Information: J. Catal.; (United States), Vol. 100:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CATALYSTS
DEACTIVATION
COKE
SYNTHESIS
HEPTANE
CATALYTIC REFORMING
NAPHTHA
ALUMINIUM OXIDES
CATALYTIC EFFECTS
COMPARATIVE EVALUATIONS
DEPOSITION
PLATINUM
ALKANES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL TAR OILS
DISTILLATES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
METALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PLATINUM METALS
REFORMER PROCESSES
TRANSITION ELEMENTS
020400* - Petroleum- Processing