The interaction of benzene and toluene with Rh dispersed on SiO[sub 2], Al[sub 2]O[sub 3], and TiO[sub 2] carriers

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1264· OSTI ID:5646047

Ioannides, T; Verykios, X E ^[1]

---

1. Univ. of Patras (Greece)

The interaction of benzene and toluene with Rh dispersed on SiO[sub 2], Al[sub 2]O[sub 3], and TiO[sub 2] carriers is investigated employing temperature-programmed desorption, temperature-programmed reaction and steady-state hydrogenation techniques. It is found that the aromatic molecules are weakly adsorbed on the carriers and are readily hydrogenated by spill-over hydrogen at room temperature. The surface coverage of benzene and toluene on Rh is found to be 0.39-0.42 and 0.34-0.38, respectively, following room temperature adsorption of 0.1 bar benzene or 0.03 bar toluene. Aromatic molecules adsorbed on Rh do not desorb molecularly, but dissociate at high temperatures producing hydrogen. Dehydrogenation reactivity is found to follow the order: Rh/TiO[sub 2] > Rh/Al[sub 2]O[sub 3] > Rh/SiO[sub 2]. Under hydrogen flow, only a small fraction of the adsorbed aromatic molecules is hydrogenated, and at sufficiently high temperatures the remainder is converted to CH[sub 4]. Results of benzene hydrogenation under steady-state conditions are questioned in view of carrier participation in the reaction scheme. 37 refs., 7 figs., 3 tabs.

• OSTI ID: 5646047
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKANES
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEHYDROGENATION
DESORPTION
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RHODIUM
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TITANIUM COMPOUNDS
TITANIUM OXIDES
TOLUENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS