在超临界正己烷介质中的F-T合成反应行为(英文)

Reaction behavior of Fischer-Tropsch synthesis in supercritical n-hexane media

在固定床反应器中,以正己烷为超临界介质,研究了三种Co催化剂(浸渍、喷雾干燥、双模催化剂)上的F-T合成反应行为.在相同的Co质量分数下,喷雾干燥催化剂和双模催化剂的活性接近,都高于浸渍催化剂.在喷雾干燥催化剂上CO的转化率显著高于浸渍催化剂.喷雾干燥催化剂F-T产物中具有高的低碳选择性和低的1-烯烃质量分数,然而在相近的CO转化率下,喷雾干燥和浸渍催化剂具有类似的1-烯烃质量分数.对于浸渍催化剂,当Co质量分数从5%增加到15%,CO转化率从8.3%增加到43.6%.含Co5%的催化剂比质量分数为10%、15%、20%催化剂的甲烷选择性低2.0%～3.0%,但产物中1-烯烃的质量分数明显要高.

The reaction performance of supercritical Fischer-Tropsch synthesis in a fixed bed reactor was studied in this work. n -hexane was used as supercritical media. Three kinds of Co catalysts ： impregnated catalyst, sprayed catalyst and bimodal catalyst were tested. Under the same Co content condition, the catalytic activity of the sprayed catalyst was similar with that of the bimodal catalyst, but higher than that of the impregnated catalyst. CO conversion over the sprayed catalysts was remarkably higher than that over the impregnated catalysts. Higher lighter fractions selectivity and lower 1-olefins content of FF products were observed over the sprayed catalysts, At the similar CO conversion conditions, however, the 1-olefins content over the sprayed catalyst was similar with that over the impregnated catalyst. For impregnated catalyst, CO conversion increased obviously from 8.3% to 43.6% when Co content increased from 5% to 15%. CH4 selectivity for 5% Co catalyst was lower about 2.0% - 3.0% than those of 10%, 15% and 20% Co catalysts. 1-Olefin content of products over 5% Co catalyst was obviously higher than those over 10%, 15% and 20% Co catalysts.