Response regularity of organic sulfur in coking coal to microwave

This paper investigates the removal of organic sulfur from three kinds of coking coal in the microwave reactor of fixed cavity under the effect of microwaves with different frequencies, as well as analyzes the chemical speciation of sulfur in coal and its relative amount before and after the radiation of microwaves with XPS method. The different features of the organic sulfur structure in the coal will be calculated with the simulated platform of materials studio, so as to explore the variation of organic sulfur in the coal and its response mechanism. The study shows that the organic sulfur group of Shanxi high sulfur coking coal includes mercaptan, thiophene and sulfoxide. After the microwave radiation with the frequencies of 840 MHz and 915 MHz, the relative amount of mercaptan decreases and the relative amount of thiophene increases while there is no obvious change with the relative amount of sulfoxide under the frequency of 2450 MHz. With the effect of external electric field, the bond length of C-S in the coal increases, the bond order decreases and the molecular dipole moment increases, which shows that the microwave radiation with the frequencies of 840 MHz and 915 MHz can effectively change the composition of organic sulfur in the coal. ©, 2015, China Coal Society. All right reserved.