A membrane reactor using palladium

Itoh, Naotsugu

doi:10.1002/aic.690330921

Cited by 315 publications

(90 citation statements)

References 5 publications

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“…Different coordination groups on the soluble polymers may cause the variation of the coordination state of palladium active species and then affect the behavior of the membrane catalyst. When NaBH is used instead of 4 NH NH as reducing agent for the same 2 2 monometallic catalytic hollow fibers, both the conversion of cyclopentadiene and selectivity for cyclopentene increase. A main reason is that the valence state and the structure of the active species of the monometallic palladium catalyst can affect the catalytic property of the catalytic polymeric hollow fibers because the reduction abilities of NH NH and NaBH are different.…”

Section: Resultsmentioning

confidence: 99%

“…Accordingly, when polymer-anchored monometallic palladium catalyst on the hollow fibers is reduced by NaBH , polymer-protected palladium 4 boride catalytic active species can be formed which exhibits relatively higher hydrogenation activity and selectivity than those reduced by NH NH . From the results of the hydrogena- 2 2 tion reaction, we find that the PVPPdrCArNaBH is more appropriate for high 4 cyclopentadiene conversion and cyclopentene selectivity than the other five catalytic hollow fibers. It is known that, for the selective hydrogenation reaction with the coordination catalyst, the selectivity for the reaction depends both on the relative coordinate ability and on the concentra-Ž .…”

Section: Resultsmentioning

confidence: 99%

“…In order to further improve the conversion of cyclopentadiene and the selectivity for cyclopentene, six bimetallic polymeric hollowfiber reactors are established with the bimetallic hollow fibers prepared by supporting NH NH 2 2 or NaBH reduced polymer-anchored bimetallic 4 palladium-cobalt catalyst on the inner wall of CA hollow fibers. Table 5 gives the results of the selective hydrogenation of cyclopentadiene with eight different mono-and bimetallic membrane reactors.…”

Section: Resultsmentioning

confidence: 99%

“…The data in Table 5 also show that the PVP-Ž . Pd-0.5Co OAc rCA bimetallic hollow fibers 2 reduced by NaBH is more appropriate for high 4 cyclopentadiene conversion and cyclopentene selectivity than the other two kinds of bimetallic Ž . hollow fibers EC-Pd-0.5Co OAc rCA and 2 Ž .…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Selective hydrogenation of cyclopentadiene in mono- and bimetallic catalytic hollow-fiber reactors

Liu

Liao

et al. 2000

Journal of Molecular Catalysis A: Chemical

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Selective hydrogenation of cyclopentadiene in mono- and bimetallic catalytic hollow-fiber reactors

Liu

Liao

et al. 2000

Journal of Molecular Catalysis A: Chemical

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“…The permeated reaction product can also be recovered in a rather pure form. The classical works of Itoh (1987) and Gryaznov (1986) led the way for others to build small membrane reactors for dehydrogenation of alkanes.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a Palladium Membrane Reactor for Dehydrogenation of Ethylbenzene.

Assabumrungrat

Suksomboon

Praserthdam

et al. 2002

J. Chem. Eng. Japan / JCEJ

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Mathematical models taking into account the non-isothermal condition and radial heat and mass transfer for the dehydrogenation of ethylbenzene to styrene in a conventional fixed-bed reactor and a palladium membrane reactor were developed using the kinetic data of a 70 wt% F 2 O 3 :20 wt% K 2 O:5 wt% Ce 2 O:5 wt% Cr 2 O 3 catalyst and the H 2 permeation data through a palladium membrane with 10 µ µ µ µ µm thickness. The study showed that due to the continuous removal of H 2 from the reaction side, both the conversion and the selectivity obtained from the membrane reactor were superior to those of the conventional fixed-bed reactor. It was shown by the theoretical study that the assumptions of isothermal and plug-flow conditions overestimated the performance of the reactors. The membrane reactor with a catalyst packed in the shell side showed superior performance to the one with a catalyst packed in the tube side because the former had lower heat transfer resistance than the latter. The operating modes in the separation side played an important role in determining the reactor performance. The use of reactive sweep gas did not only rapidly consume the permeating H 2 but also supplied additional heat to the reaction side; however, the resulting performance may be interior to the other operating modes such as vacuum and inert sweep gas modes.

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Dehydrogenation – Heterogeneous

Resasco

2002

Encyclopedia of Catalysis

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The dehydrogenation of alkanes is an important industrial reaction, widely used to produce olefins. This endothermic reaction is thermodynamically favored at high temperatures and low pressures. As a result, it typically operates under severely deactivating conditions. Therefore, the design of effective catalysts and processes is an interesting technical challenge. Catalytic dehydrogenation is employed in the production of propylene, isobutylene, C 6 –C 19 monoolefins, as well as styrene from ethylbenzene. Dehydrogenation is typically carried out on noble metal catalysts, such as Pt, or oxide catalysts, such as chromia. Promoters are used to improve the selectivity and stability of dehydrogenation catalysts. On Pt‐based catalyst, the preferred promoter is Sn, which modifies Pt geometrically and electronically to reduce the undesired side reactions, hydrogenolysis, and coking. On chromia‐based catalysts, the addition of alkali improves the performance. In addition to Pt‐ and chromia‐based catalysts, other catalytic materials have been used in dehydrogenation reactions. They include iron oxide, zinc titanates, and sulfided nickel.

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A membrane reactor using palladium

Cited by 315 publications

References 5 publications

Selective hydrogenation of cyclopentadiene in mono- and bimetallic catalytic hollow-fiber reactors

Selective hydrogenation of cyclopentadiene in mono- and bimetallic catalytic hollow-fiber reactors

Simulation of a Palladium Membrane Reactor for Dehydrogenation of Ethylbenzene.

Dehydrogenation – Heterogeneous

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