Comparison of ethylene with propylene hydroformylation over a Rh-Y zeolite catalyst under atmospheric pressure

Journal Article · Sun Jan 01 00:00:00 EST 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90112-X· OSTI ID:5152080

Takahashi, N; Kobayashi, M

Hydroformylation of ethylene and propylene over the Rh-Y zeolite was carried out in a continuous-flow system under atmospheric pressure. The activity of the catalyst used for the formation of propionaldehyde and butyraldehyde was observed to be constant for a period of over 1 month. Pretreatment of the catalyst with He-H/sub 2/ (10%) at 127/sup 0/C considerably affected the steady-state rate (r/sub PA/) and the apparent activation energy (E/sub PA/) for the propionaldehyde formation. On the Rh-Y zeolite with a rhodium content of less than 110 x 10/sup -6/ mol/g cat (1.13 wt%), the enhancement in r/sub PA/ was observed with no appreciable change in E/sub PA/. On the other hand, on the Rh-Y zeolite (No. 6) with a rhodium content of 280 x 10/sup -6/ mol/g cat (2.88 wt%), r/sub PA/ was somewhat reduced by the pretreatment while E/sub PA/ was considerably enhanced, i.e., 40 kJ/mol on the untreated catalyst and 56 kJ/mol on the pretreated one. In the propylene hydroformylation, the pretreatment of the Rh-Y (No.6) remarkably reduced r/sub BA/ compared with r/sub PA/, but it enhanced the n-isomer selectivity (S/sub n-BA/). The enhancement in S/sub n-BA/ is closely related to the enhancement in E/sub PA/. On the basis of the results obtained, it is concluded that 1) the active sites formed either at the entrance of the pore or the external surface can effectively catalyze both the hydroformylation of ethylene and propylene and 2) the active sites formed in the pore at a very short distance from the entrance can catalyze the hydroformylation of ethylene but not propylene. 7 figures, 2 tables.

• Research Organization: Kitami Inst. of Tech., Hokkaido, Japan
• OSTI ID: 5152080
• Journal Information: J. Catal.; (United States), Vol. 85:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHYLENE
CARBONYLATION
PROPYLENE
ACTIVATION ENERGY
ATMOSPHERIC PRESSURE
CATALYSIS
CATALYSTS
RHODIUM
STEADY-STATE CONDITIONS
YTTRIUM
ZEOLITES
ALKENES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
PLATINUM METALS
TRANSITION ELEMENTS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)