Encapsulated oxo-bridged organometallic cluster catalyst and a process for the preparation thereof
a cluster catalyst and oxo-bridge technology, applied in the field of encapsulation of oxo-bridged organometallic cluster complex catalysts, can solve the problems of reducing the reusability of catalysts, reducing the oxidation efficiency of catalysts, etc., to achieve simple filtration process, enhance the effect of oxidation activity of alkyl aromatic compounds to aromatic carboxylic acids, and easy separation from reaction products
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example-2
[0039] This example illustrates the preparation of zeolite-Y-encapsulated Co.sub.3O)(CH.sub.3COO).sub.6(pyridine).sub.3 complex designated as catalyst system (2). Co(II) exchanged zeolite-HY was prepared by the ion-exchange method, in which zeolite HY(7 g) was interacted with 4.3 g of Co(CH.sub.3COO).sub.2.4H.sub.2O dissolved in 100 ml distilled water at 60.degree. C. with constant stirring. The solid product was then washed thoroughly with water (500 ml) and dried at 100.degree. C. CoY, thus obtained, was used in the preparation of catalyst system 2. In a typical preparation of catalyst system (2), CoY(1.5 g) was taken in 15 ml glacial acetic acid and to it was added pyridine (3 ml), NaBr (0.5 g), aq. H.sub.2O.sub.2 (50%, 10 ml) and distilled water (5 ml). The reaction mixture was stirred while passing air, for 2 h, at 25.degree. C. The brown solid zeolite (Co.sub.3 cluster encapsulated in zeolite-Y; catalyst system 2) was then filtered and dried at 25.degree. C. under vacuum.
example-3
[0040] This example illustrates the preparation of zeolite-Y-encapsulated Mn.sub.3(O)(CH.sub.3COO).sub.6(pyridine).sub.3 complex designated as catalyst system (3). Mn(II) exchanged zeolite-HY was prepared by ion-exchange method, in which zeolite HY (7 g) was interacted with 4.3 g of Mn(CH.sub.3COO).sub.2.4H.sub.2O dissolved in 100 ml distilled water at 60.degree. C. with constant stirring. The solid product was then washed thoroughly with water (500 ml) and dried at 100.degree. C. MnY, thus obtained, was used in the preparation of catalyst system 3. In a typical preparation of catalyst system (3), MnY(1.5 g) was taken in glacial acetic acid (15 ml) and to it was added pyridine (3 ml), NaBr (0.5 g) and aq. H.sub.2O.sub.2 (50%, 10 ml) and distilled water (5 ml). The reaction mixture was stirred while passing air, for 2 h, at 25.degree. C. The brown solid zeolite (Mn.sub.3 cluster encapsulated in zeolite-Y; catalyst system 3) was then filtered and dried at 25.degree. C. under vacuum.
example 4
[0041] This example illustrates the preparation of zeolite-Y-encapsulated CoMn.sub.2(O)(CH.sub.3COO).sub.6 complex designated as catalyst system 4. Mixed metal Co--Mn(II) exchanged zeolite HY (CoMnY) was prepared by ion exchange method as described in Example 1. CoMnY (1.5 g) was taken in 15 ml glacial acetic acid and to this NaBr (0.5 g) and aq. H.sub.2O.sub.2 (50%, 10 ml) and distilled water (5 ml) was added. The reaction mixture was stirred while passing air, for 2 hours at 25.degree. C. The brown solid zeolite (CoMn) cluster complex encapsulated in zeolite-Y was then filtered and dried at 90.degree. C.
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