Microwave pyrolysis of SF6 on alumina-based catalyst doped with cerium sulfate was investigated. Silicon Carbide (SiC) used as a microwave susceptor. The catalysts were characterized by X-ray diffraction (XRD) and the destruction and removal efficiency (DRE) of SF6 was evaluated by GC-TCD. We found that the optimal cerium content was 20wt% at microwave pyrolysis of SF6. The catalysts modified by cerium showed higher DRE at lower reaction temperature compared with original catalysts. The highest DRE of SF6 on CeA (20) was 80% at 600oC reaction temperature and the DRE was up to 95% when the reaction temperature over 700oC. It showed the alumina-based with cerium promotes the removal efficiency of SF6 at a mild reaction temperature. From XRD results, modified catalysts could be higher stability because of no transformation of the crystal phase after reaction.

Tetrafluoromethane(CF4) have been widely used as etching and chemical vapor deposition gases for semiconductor manufacturing processes. CF4 decomposition efficiency using microwave system was carried out as a function of the microwave power, the reaction temperature, and the quantity of Al2O3 addition. High reaction temperature and addition of Al2O3 increased the CF4 removal efficiencies and the CO2/CF4 ratio. When the SA30 (SiC+30wt%Al2O3) and SA50 (SiC+50wt%Al2O3) were used, complete CF4 removal was achieved at 1000℃. The CF4 was reacted with Al2O3 and by-products such as CO2 and AlF3 were produced. Significant amount of by-product such as AlF3 was identified by X-ray powder diffraction analysis. It also showed that the γ-Al2O3 was transformed to α-Al2O3 after microwave thermal reaction.

The objective of this study was to evaluate the changes in the physicochemical and microbiological characteristics of pork loin meat through microwave treatment. The microwave treatment was divided into two groups: continuing microwave treatment (CW) and holding microwave treatment (HW). The microwave treatment resulted in a whiter color (L value) and affected the a, b value. The initial pH was 5.51~5.74, but it increased to 6.32~6.51 when the pork loin samples were stored for three days. During storage for 14 days, the pH changes were not significantly different (p>0.05). The thiobarbituric-acid values of all the pork loin samples increased along with the storage period, and decreased with increasing microwave dose. The volatile basic nitrogen (VBN) content of the control was higher than those of the other samples, and the VBN content decreased along with the microwave dose. The total plate counts of the pork loin samples decreased with increasing microwave dose. The study results indicated that T2 (100 W, HW) is most effective for the safety of pork loin meat without decreasing the meat’s physicochemical and microbiological characteristics.

Silicon carbide with aluminium oxide was used to remove the sulphur hexafluoride (SF6) gas using microwave irradiation. The destruction and removal efficiencies (DREs) of SF6 were studies as a function of various decomposition temperatures and microwave powers. The decomposition of SF6 gas was analyzed using GC-TCD. XRD (X-ray powder diffraction) and XRF (X-ray Fluorescence Spectrometer) were used to characterize the properties of aluminum oxide. DREs of SF6 were increased as the microwave powers were increased. Additive aluminium oxide on SiC increased the removal efficiencies and decreased the decomposition temperature. The XRD results show that the γ-Al2O3 was transformed to α-Al2O3 during SF6 decomposition by microwave irradiation. It was found that the best material to control SF6 was SiC with Al2O3 30 wt% in consideration of microwave energy consumption and SF6 decomposition rate.

Toluene desorption of modified activated carbon for microwave irradiation was evaluated. As a virgin GAC reacted from microwave energy, it created an "arcing" between GAC particles in desorption process. The arcing became more and more vigorous and achieved a red flame of GAC. The silica coated GAC(Si/GAC) was developed to prevent arcing phenomenon and temperature control problem. The result shows virgin GAC with 5wt%, 10wt% and 20wt% silica had no arcing and could control temperature very well. However, the adsorption rate of Si/GAC was decreased by coated silica amount due to decreasing surface area of GAC. The 5wt% Si/GAC adsorption rate was quite similar to virgin GAC adsorption rate. After adsorption, the toluene-loaded GAC and Si/GAC was reactivated by 2450MHz MW irradiation with 300W for 5 min. Quantitative desorption of the toluene was achieved at MW irradiation at 300W with desorption efficiencies as high as 98.59% to 84.65%% after four cycles.

In this study, the characteristics of granular activated carbon (GAC) supported metal was investigated in an area influenced by flame discharge and temperature variation during irradiating microwave. The modified GAC was formulated by impregnating metal hydroxides of nickel (Ni/GAC), barium (Ba/GAC), copper (Cu/GAC), zinc (Zn/GAC), cobalt (Co/GAC) and lanthanum (La/GAC). Ba/GAC was selected as it showed lack of spark discharge and temperature increasing aspects. Comparison of adsorption and desorption amount of GAC and Ba/GAC showed that adsorption and desorption rate of the GAC were higher than those of Ba/GAC. The results show that the presence of barium can decrease adsorption/desorption rate because of plugging pore of GAC. Toluene regeneration rate of Ba/GAC was better than that of GAC due to barium loading. Finally, GAC with barium can be controled a rapid increasing temperature and spark discharge, increased the regeneration rate of toluene during desorption by irradiating microwave.

배연탈황석고 및 인산부산석고에 함유된 부착수분을 마이크로파에 의한 직접 내부 가열 방법으로 증발시켜 건조하고자 하였다. 700 W, 1,000 W, 1,700 W의 출력인 마그네트론에서 발생된 2.45 GHz의 마이크로파로 배연탈황석고와 인산부산석고를 가열한 결과, 마이크로파 출력의 세기를 700 W에서 1,700 W로 높임에 따라 부착수의 증발시간이 10분에서 3분으로 단축되었고, 이수석고는 베타형 반수석고로 변질되었다. 그러나 베타형 반수석고는 무수석고로 변질되지 않았다.