Nanjing Tech University

Nanjing University of Technology

Rizhi Chen

Weihong Xing

Jiuxuan Zhang

Hong Jiang

Nanping Xu

Yiqun Fan

Liu Yang

Yan Du

Guodong Shao

Honglin Mao

Yaohui Bao

Hongnian Shang

A preparation method of a Co@CM multi-channel ceramic catalytic membrane for hydrogenation of p-nitrophenol is provided. In the catalytic membrane, a multi-channel ceramic membrane is adopted as a substrate. A cobalt salt as an active component is loaded in situ on a surface and in pores of the multi-channel ceramic membrane through a forced circulation with the help of the excellent reduction and anchoring effects of dopamine (DA), and then subjected to in situ self-reduction through calcination to produce the Co@CM multi-channel ceramic catalytic membrane. The preparation method has the following advantages: Nano-scale Co particles are loaded instead of a precious metal on a multi-channel ceramic membrane, and the surface of the Co particles is wrapped by carbon and nitrogen, which can effectively inhibit the loss of Co particles during a reaction. In addition, there is no need to add an additional reducing agent during the reduction of Co.

Preparation method of Co@CM multi-channel ceramic catalytic membrane for hydrogenation of p-nitrophenol

A simple preparation method and use of a support of a catalyst for hydrogenation are provided. The support is prepared by a direct mixing method as follows: 2-methylimidazole is directly mixed with different cobalt sources, and then calcination and acid-washing are conducted. This method has advantages such as simple preparation process flow, short preparation cycle, low raw material cost, and high support output. A Pd@CN catalyst prepared from the support can exhibit a high catalytic activity when used in a reaction system for phenol hydrogenation to prepare cyclohexanone.

Simple preparation method and use of support of catalyst for hydrogenation

The invention relates to a catalyst for benzene hydroxylation for preparation of phenol and a preparation method thereof, wherein said catalyst uses a mesoporous material as carrier, and the catalyst is prepared by first modifying the surface of the carrier using aminosilane, then immersing with acetylacetonate salt of metal, and finally washing and drying. Advantage of the invention is that a reactive metal is loaded on the silane-modified mesoporous material to form a homogeneous-heterogeneous composite catalyst, wherein, the reactive metal component is present in a reaction system in a homogeneous form, which ensures high catalytic performance of the catalyst component, and it is loaded on the carrier through bridging action of aminosilane, which improves the acting force between the metal component and the carrier, enhances stability of the catalyst, and facilitates separation of the catalyst from the product. The catalyst has a simple preparation process, has excellent catalytic performance, and can be applied to the reaction system of benzene hydroxylation for preparation of phenol.

Catalyst for benzene hydroxylation for preparation of phenol and preparation method thereof

The invention relates to a solvent-free green ammoximation process based on membrane distribution with a procedure as: adding TS-1 catalyst and ketone into a reactor in advance; setting the stirring speed and reaction temperature; after reaching the set temperature, adding a certain amount of ammonia and hydrogen peroxide into a reaction solution, wherein the hydrogen peroxide is fed in a way of using membrane as a distributor, the ammonia is fed in a continuous or semi-continuous manner; oxime is produced upon the reaction. The advantages of the invention include the mild reaction conditions, high reacting efficiency, simple operation and environmentally-friendly process. And there is no need to add any solvent during the reaction process. During the ammoximation reaction, both the conversion rate of the ketone and the selectivity of the oxime can be over 98.0%.

Solvent-free green ammoximation process based on film distribution

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Nanjing, China

Rizhi Chen