Effect of highly dispersed iron catalyst on direct liquefaction of coal
Effect of highly dispersed iron catalyst on direct liquefaction of coal
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DOI：
10.1016/s0016-2361(99)00160-x
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发表时间：
2000-02-01
期刊：
影响因子：
7.4
通讯作者：
Shimasaki, K
中科院分区：
文献类型：
--
作者：
Kaneko, T;Tazawa, K;Shimasaki, K
采用红外热像炉考察了高分散γ-FeOOH催化剂对雅伦煤液化的影响，并与传统的黄铁矿催化剂进行了比较。发现γ-FeOOH催化剂在高达450 ° C的加热阶段期间显著促进气态氢的活化，因为它可以在约250 ° C的较低温度下转化为较小尺寸的磁黄铁矿。结果，由于烃气体的较低产率，氢消耗对油产率的效率显著增加。与使用黄铁矿催化剂的情况相比，在0.1t/d的气体和底部循环的小型装置（BSU）上进行了进一步的连续液化试验，并在间歇式高压釜上考察了循环催化剂在煤液底部（CLB）中的残留活性，在新鲜催化剂和循环催化剂中，随着磁黄铁矿晶粒尺寸的减小，油产率增加。在气相中添加元素硫，既抑制了硫铁矿的生成，又抑制了磁黄铁矿的晶体生长，从而有效地保持了循环催化剂的液化活性。结果表明，在γ-FeOOH催化剂用量大幅度减少的情况下，雅伦煤的液化油收率可达60wt%以上。(C)2000爱思唯尔科技有限公司版权所有。
The effect of a highly dispersed gamma-FeOOH catalyst on the liquefaction of Yallourn coal was examined using a rapid-heating autoclave equipped with an infrared-ray image furnace, in relation to its transformation into pyrrhotite (Fe1-xS), by comparison with a conventional pyrite catalyst. It was found that the gamma-FeOOH catalyst promoted the activation of gaseous hydrogen remarkably during the heating stage up to 450 degrees C, as it could be transformed into smaller size pyrrhotite at lower temperatures of around 250 degrees C, As a result, the efficiency of hydrogen consumption on oil yield was significantly increased due to a lower yield of hydrocarbon gases, compared with the case where pyrite catalyst was used, Further continuous liquefaction tests were performed using a 0.1t/d Bench Scale Unit (BSU) with gas and bottom recycling, and the residual activities of the recycle catalysts in the coal liquid bottom (CLB) were examined using a batch type autoclave, It appeared that the oil yield increased with a decrease in the crystallite size of pyrrhotite among the fresh and recycle catalysts, Control of H2S at a concentration of approximately 1.0 vol.% in the gas phase by the addition of elemental sulfur was effective in maintaining the liquefaction activity of recycle catalyst because of the suppression of both troilite formation and the crystal growth of pyrrhotite, It was demonstrated that a high oil yield of over 60wt%daf was obtained in the liquefaction of Yallourn coal with a considerable reduction of gamma-FeOOH catalyst loading. (C) 2000 Elsevier Science Ltd. All rights reserved.