Search

The CO 2 reforming of methane (in coke oven gas) on the coal char catalyst was performed in a fixed bed reactor at temperatures between 800 and 1200 °C under normal pressure. The effects of the coal char catalyst pretreatment and the ratio of CO 2 /CH 4 were studied. Experimental results showed that the coal char was an effective catalyst for production of syngas, and addition of CO 2 did not enhance the CH 4 reforming to H 2 . It was also found that the product gas ratio of H 2 /CO is strongly influenced by the feed ratio of CO 2 /CH 4 . The modified coal char catalyst was more active during the CO 2 –CH 4 reforming than the coal char catalyst based on the catalyst volume, furthermore the modified catalyst exhibited high activity in CO 2 –CH 4 reforming to syngas. The conversion of methane can be divided into two stages. In the first stage, the conversion of CH 4 gradually decreased. In the second stage, the conversion of methane maintained nearly constant. The conversion of CO 2 decreased slightly during the overall reactions in CO 2 –CH 4 reforming. The coal char catalyst is a highly promising catalyst for the CO 2 reforming of methane to syngas.

The organic sulfur transformation was studied during coke oven gas to produce syngas via noncatalytic partial oxidation. The concentration of CS2 and thiophene was examined in syngas by sulfide detector. For comparison, the sulfur transfer was also studied in coke oven gas under dry and hydrous conditions. When the ratio of O2 / Gas was 0.32, complete thiophene and about 83% of CS2 in feed gas could be transformed via noncatalytic partial oxidation in the dry condition. It was mainly because of burner nozzle unique structure forming local hyperthemia, which benefited OH, O free radical and active atoms. During steam transforming to produce syngas, the ratio of water to carbon was less than 3, a higher ratio of O2/Gas favored sulfur transformation. However, compared to dry feed, transforming rate of CS2 and thiophene was decreased. This indicates that the steam added was disadvantageous to the transformation of organic sulphur during the production of syngas by noncatalytic partial oxidation, steam and mass H2S in feed gas, resulting in the decrease of local hyperthermia temperature and the formation of organic sulfur