Preparation Of Solid Catalysts Research Articles

Cobalt oxide encapsulated hydrophilic hierarchical Silicalite-1 for highly efficient conversion of cyclohexyl hydroperoxide

Abstract CHHP is the main product of the cyclohexane oxidation process, the rational design and preparation of solid catalysts are vital important for the development of an environmental benign CHHP conversion process. Herein, cobalt oxide encapsulated hydrophilic hierarchical Silicalite-1 was developed for CHHP conversion. In the presence of an organosilane, the encapsulation of cobalt oxide, creation of intracrystalline secondary porosity, and introduction of surface silanols were simultaneously achieved via hydrothermal synthesis. The particle size of the encapsulated cobalt oxide was about 4.7–6.3 nm, while the SBET, VT and VME are 527 m2/g, 0.417 cm3/g and 0.3 cm3/g, respectively. Moreover, the SBET further increases to 692 m2/g when the silanization process was intensified by surfactants, and the hydrophilic substrates could more easily be adsorbed by the catalyst for the abundant terminal silanols. Then, the dilute CHHP could selectively be adsorbed and activated by the catalyst, and a CHHP conversion of more than 99% could be achieved in 20min. More importantly, the catalyst exhibits outstanding activity in both the CHHP decomposition reactions and cyclohexane oxidation reaction with CHHP as the oxidant, the oxygen utilization efficiency (60%) and KA oil selectivity (120%) were notably improved. The stability of the catalyst is excellent, the activity retained after recycling for 20 times. This strategy is general, which could further be applied for the development of heterogeneous catalysts for more environmental benign chemical processes.

Preparation of Solid Catalyst from Extracted Silica of Iris persica L.

Preparation of Solid Catalyst from Extracted Silica of Iris persica L.

Preparation of Solid Catalysts and Its Application for Conversion of Heavy Petroleum Fractions

Solid catalysts for petroleum refining and catalytic transformations have been developed starting from local Algerian materials, mainly “bentonite“[1]. These catalysts are used for the transformation of the heavy fractions and the residues of the oil by the catalytic processes leading to obtaining clean and environmentally friendly petrol (fuel) as well as petroleum fractions that are considered as important raw materials for petrochemical, pharmaceutical, and cosmetic industry. The preparation of modified catalysts using Algerian local bentonite enriched by oxides to give them a better performance for the validation of certain fractions of oil and condensate is described. Keywords: Heterogeneous catalysis; Heavy petroleum fractions; Solid Catalysts.

Ionic Liquids‐Based Catalysis with Solids: State of the Art

Abstractmagnified imageTopics related to ionic liquid (IL)‐based catalysis with solids not only open new ways for studies of heterogeneous catalysts, but also minimize many of the negative effects that current ILs have encountered. This review evaluates the various examples in solid‐based heterogeneous catalytic systems that have been developed with the aid of ILs. Catalysis over ready‐made solid catalysts in the presence of ILs, immobilizations of homogeneous organic and organometallic catalysts with the concepts of supported ionic liquid phase catalysis, metal nanoparticles catalysts in ILs, catalysis over supported ILs as well as metal complexes and the preparation of solid catalysts by using ILs as solvents have been described. In several cases, detailed information on the performance concerning catalytic activity and recyclability is available.

2-9 超臨界相炭酸ガスを用いた固体触媒の調製((3)天然ガス転換技術1,Session 2 天然ガス・メタンハイドレート等)

2-9 超臨界相炭酸ガスを用いた固体触媒の調製((3)天然ガス転換技術1,Session 2 天然ガス・メタンハイドレート等)

An approach to heterometallic alkoxide-β-diketonate complexes with a M 4O 4 cubane-like core and new prospects of their application in preparation of solid catalysts. X-ray single crystal study of (Co,Ni) 4(acac) 4(μ 3-OMe) 4(MeOH) 4, Co 2Ni 2(acac) 4(μ 3-OMe) 4(OAc) 2 and Mg 4(acac) 4(μ 3-OMe) 4(MeOH) 4

The interaction of the individual M 4(acac) 4(μ 3-OMe) 4(MeOH) 4 complexes, M=Co, Ni in toluene/methanol media provided crystals of (Co,Ni) 4(acac) 4(μ 3-OMe) 4(MeOH) 4 ( I) — the product of co-crystallization of isomorphous products. The oxidation of a MeOH solution of I in air in the presence of NaOAc and aminoalcohols as catalysts gave Co 2Ni 2(acac) 4(μ 3-OMe) 4(OAc) 2 ( II), an individual heterometallic derivative. The interaction of Mg(OCH(CH 3)CH 2NMe 2) 2 with Cu(acac) 2 in toluene/methanol media produced Mg 4(acac) 4(μ 3-OMe) 4(MeOH) 4 ( III) as the only isolatable product. The starting Co and Ni homometallic complexes as well as the heterometallic CoNi complex II were used to prepare the zeolite-supported oxide catalysts which exhibited extremely high activity towards methanol oxidation.