Dong Jin-xiang

PREPARATION AND PROPERTIES OF ZEOLITE COATING ON METAL SURFACE

Crystals of mordenite were grown on metallic Cr surface by the vapor phase method. The material of zeolite coating on metal surface has been characterized by X-ray powder diffraction and microprobe. It is shown by the results that this material possesses good catalytic properties.AbstractКристаллы морденита наносили на поверхность металла (Cr) с помощью газофазного метода. Зеолит на поверхности металла характеризовали с помошью рентгеновской диффракции порошка. Показано, что данный материал обладает хорошими каталитическими свойствами.

Zeolite ZSM-35 synthesized by the ‘kneading’ method in a nonaqueous system

The zeolite ZSM-35 has been synthesized from an extremely dense nonaqueous system in which the weight ratio of solid (aluminosilicate gels and NaOH) to liquid (ethylenediamine and triethylamine) mixtures is 2.9:1; the product has improved catalytic properties compared with samples prepared by previous methods.

3.15 Preparation and Properties of a New Kind of Acid Catalyst of Zeolite Coating on Metal Surface

Abstract The catalytic material of mordenite coating on metal Cr surface (MOR/Cr) is first synthesized by the vapor phase method and characterized by IR, SEM and microprobe techniques. The experimental results show that the crystals of mordenite grow on metal Cr surface and Cr does not enter the mordenite framework. It seems that Cr does not exert any effect on the position of IR absorption bands of mordenite. In HMOR/Cr sample, there exist Si, Al, Cr and a little Na, and the Cr atom content is 1.02% as determined by the microprobe method. As a catalyst, HMOR/Cr shows good catalytic properties for the reaction of o-xylene isomerization.

Zeolite ZSM-5 synthesized in the extremely dense system

It is the first time that zeolite ZSM-5 was synthesized in the extremely dense system. R/SiO 2 decreases 0.0156. Water added additionally in the reactant mixtures prompts the crystallization of ZSM-5. It is worth mentioning that pure ZSM-5 was synthesized at 383K and in the extremely dense system, which has regular morphology and higher crystallinity. The formation of ZSM-5 is affected by the amount of the reactant composition. There is not liquid materials seen before and after the crystallization. So, this method can raise the productivity, reduce the cost and pollution of environment. It is of the potential future in the industry.

3.10 A New Method for Preparing High Silica ZSM-48 Catalysts

Abstract Zeolite ZSM-48 was prepared by the kneading method for the first time. The reactant mixture contains a little 1,6-hexanediamine and much solid material. The weight ratio of aluminosilicate gels to C 6 DN is 3.4. Due to adding much less liquid material, the autoclave is used more efficiently and the yield of per volume of autoclave increases by a large margin. A seperation procedure is not needed after crystallization. This method shows a bright future in the zeolitie industry.