将穆斯堡尔谱应用于煤炭催化液化的研究——Ⅱ.某些变数对铁催化剂转化的影响

APPLICATION OF MSSBAUER SPECTROSCOPY TO THE STUDY OF COAL CATALYTIC LIQUEFACTION——Ⅱ. EFFECTS OF SOME VARIABLES ON THE TRANSFORMATION OF IRON CATALYSTS

在以铁系物为煤液化催化剂的反应中,新生Fe_(1-x)是催化活性物种。Monta no认为煤液化条件下,FeS_2向Fe_(1-x)S转化的过程依赖于反应时间、温度和液化煤种。随着液化反应时间的增长,温度的提高,FeS_2转化率增大。液化反应体系的H_2S气体分压影响着Fe_(1-x)S的化学计量式。本文用穆斯堡尔谱研究了煤在铁系催化液化反应中,几种因素对Fe_(1-x)S生成情况的影响。

Relations of the transformation of iron catalysts to the quantity of S added, temperature and reaction time have been investigated with Mossbauer spectroscopy. When Fe_3O_4 was used as the catalyst and S added reached 4%, Fe_3O_4 was transformed completely to FeS_2 and Fe_(1-x)S. As S further added FeS_2 was further transformed to Fe_(1-x)S. It was found that net liquefaction conversion increased as the quantity of Fe_(1-x)S increased. When Fe_2O_3+2w%S was used in the temperature range of 390°-450℃, and the reaction time 30mi, Fe_(1-x)S increased with temperature and the net liquefaction conversion increased in general. When FeS_2 was used as catalyst, it was transformed completely to Fe_(1-x)S even at 390℃. When Fe_3O_4+2w%S was used as the catalyst, Fe_(1-x)S and net liquefaction conversion increased as reaction time increased from 15 to 60min.