Heterogenized homogeneous catalyst. 4. Catalyst with a bias active site distribution

Chou, Tse‐Chuan; Lin, Jilei; Liang, Chin Huang; Shan, Jing

doi:10.1021/ie00098a006

Cited by 16 publications

(11 citation statements)

References 12 publications

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“…In three previous studies (Chou and Lee, 1985;Hwang and Chou, 1987;Chou et al, 1990), polymeric materials or resins were used as the support of a homogeneous catalyst, i. e. , heterogenized homogeneous catalyst. Polymeric supports are useful for enzyme-like catalysts (Luisi, 1979) for producing asymmetric compounds, but generally catalysts supported on inorganic oxides are not useful (Izumi, 1983).…”

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confidence: 99%

Hydrogenation of (—)‐α‐pinene over nickel—phosphorus/aluminum oxide catalysts prepared by electroless deposition

Chou

1994

Can J Chem Eng

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Liquid-phase hydrogenation of (-)-a-pinene was investigated using a new type of amorphous nickel-phosphorus catalyst supported on aluminum oxide. The catalyst was prepared by the electroless deposition of nickel on the solid support at atmospheric pressure and moderate temperature from an aqueous solution. Two types of supports, aluminum oxide powder and pellet, were used. Electron probe micro-analysis (EPMA) indicated that the nickel profile on the aluminum oxide powder was uniform throughout the whole particle of the powdery support; however, the nickel deposition on the catalyst supported by pellet aluminum oxide exhibited an eggshell-type profile with a thickness about 8 pm. The amorphous structure of the nickel was confirmed by X-ray diffraction (XRD). The procedure by which the catalysts were prepared involved four steps: etching, sensitization, activation and deposition. The conditions employed for the sensitization, activation and deposition steps significantly affected the composition, structure, metal profile and activities of the catalysts. Etching, however, had a negligible effect on the properties of the catalysts. Very high selectivity was found for hydrogenation of (-)-a-pinene to cis-pinane.On a etudie I'hydrogenation en phase liquide du (-)-a-pinhe au moyen d'un nouveau type de catalyseur amorphe au nickel-phospore supportC sur de I'oxyde d'aluminium. Le catalyseur a CtC prtpare par un dip& de nickel sur le support solide a la pression atmospherique et B temperature modCree B partir d'une solution aqueuse par une technique non-electrique. Deux types de supports, poudre et granules d'oxyde d'aluminium, ont ete utilises. La micro-analyse par sonde des electrons (EPMA) indique que le profil du nickel sur la poudre d'oxyde d'aluminium est uniforme sur la totalit6 de la particule du support poudreux; cependant, le dCp6t de nickel sur le catalyseur supporte par l'oxyde d'aluminium sous forme de granules montre un profil en forme de coquille d'oeuf avec une epaisseur d'environ 8 pm. La structure amorphe du nickel est confirmee par la diffraction des rayons X (DRX). La procedure ayant servi a la mise au point des catalyseurs comprend quatre Ctapes: dtcapage, sensibilisation, activation et deposition. Les conditions employees pour les etapes de sensibilisation, d'activation et de deposition influent considerablement sur la composition, la structure, le profil mktallique et les activitts des catalyseurs. Toutefois, le dtcapage a un effet negligeable sur les proprittks du catalyseur. On a trouve une trks grande stlectivite pour I'hydrogenation de (-)-a-pinkne en cis-pinane.

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confidence: 99%

Hydrogenation of (—)‐α‐pinene over nickel—phosphorus/aluminum oxide catalysts prepared by electroless deposition

Chou

1994

Can J Chem Eng

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“…However, methods to decrease the amount of byproduct and to improve the stability of organic peracids simultaneously are seldom discussed. Recently, several investigations reported that high yields of organic peracids could be obtained using a heterogenized homogeneous metal ion on resin as catalyst (Chou and Lee, 1985;Hwang and Chou, 1987;Kuo and Chou, 1987;Chou et al, 1990;Yeh, 1992a,b, Chen andChou, 1994). The immobilized metal ions by other supports are seldom mentioned.…”

Section: Introductionmentioning

confidence: 99%

Epoxidation of Oleic Acid in the Presence of Benzaldehyde Using Cobalt(II) Tetraphenylporphyrin as Catalyst

Chou

Lee

1997

Ind. Eng. Chem. Res.

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Epoxidation of oleic acid with oxygen in the presence of benzaldehyde using cobalt(II) tetraphenylporphyrin (Co 2+ -TPP) as catalyst was studied. The results show that high yield of epoxidized oleic acid is obtained by the liquid phase epoxidation of oleic acid in the presence of benzaldehyde using Co 2+ -TPP as catalyst, which does not catalyze the decomposition of perbenzoic acid, which is one of the oxidation reagents for epoxidation and is formed by the oxidation of benzaldehyde. The oleic acid can be easily epoxidized in this system. The reaction mechanism was proposed. The experimental and theoretical results indicate that the epoxidized oleic acid is formed by a series of free-radical reaction steps. The rate-determining steps were experimentally identified, and the rate equation of epoxidation was obtained. The factors affecting the rate of epoxidation of oleic acid were also obtained.

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“…The performance of supported nickel catalysts is strongly dependent on the preparation procedures including the steps of impregnation, drying, calcination, reduction, and passivation. In several previous studies (Chou and Lee, 1985; Hwang and Chou, 1987;Lin and Chou, 1990), polymeric materials or resins were used as the support of a homogeneous catalyst, i.e., heterogenized homogeneous catalyst, and it was found that the preparation of the catalyst plays an important role in the activity of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

The Role of Anion in the Preparation of Nickel Catalyst Detected by TPR and FTIR Spectra

Ho¹,

Chou²

1995

Ind. Eng. Chem. Res.

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Heterogenized homogeneous catalyst. 4. Catalyst with a bias active site distribution

Cited by 16 publications

References 12 publications

Hydrogenation of (—)‐α‐pinene over nickel—phosphorus/aluminum oxide catalysts prepared by electroless deposition

Hydrogenation of (—)‐α‐pinene over nickel—phosphorus/aluminum oxide catalysts prepared by electroless deposition

Epoxidation of Oleic Acid in the Presence of Benzaldehyde Using Cobalt(II) Tetraphenylporphyrin as Catalyst

The Role of Anion in the Preparation of Nickel Catalyst Detected by TPR and FTIR Spectra

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