Catalytic conversion of glucose in fructose utilizing high-silica zeolite Sn-ZSM-12

Conversão catalítica de glicose em frutose utilizando zeólita Sn-ZSM-12 de alta sílica

Abstract

Tin incorporation in high-silica ZSM-12 zeolite was evaluated using different concentrations of tin and different structure-directing agents (SDA), in order to be used in the glucose isomerization reaction in fructose. The tetraethylammonium hydroxide SDA successfully formed the structure of the high silica zeolite ZSM-12; however, in this system, the addition of Sn prevented the formation of the ZSM-12 zeolite. Therefore, tetraethylammonium bromide was used as SDA, but the syntheses of high-silica ZSM-12 zeolite without and with tin incorporation were not effective. Then methyltriethylammonium chloride was used as SDA, and the high-silica ZSM-12 structure was formed only with the incorporation of tin. The samples with ZSM-12 structure and different concentrations of tin were evaluated in reaction of glucose conversion to fructose. It was found that the sample with the lowest tin content $(\mathrm{Sn}/\mathrm{Si}=0.005)$ achieved the highest glucose conversion and the highest fructose yield.

Keywords:
MTW; zeolites; high-silica; isomerization; sugars