HIGHLY-ACTIVE IRON CATALYSTS FROM FERRIC-CHLORIDE FOR THE STEAM GASIFICATION OF BROWN-COAL
HIGHLY-ACTIVE IRON CATALYSTS FROM FERRIC-CHLORIDE FOR THE STEAM GASIFICATION OF BROWN-COAL
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DOI：
10.1021/ie00020a014
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发表时间：
1993-08-01
影响因子：
4.2
通讯作者：
OHTSUKA, Y
中科院分区：
文献类型：
--
作者：
ASAMI, K;OHTSUKA, Y
研究了以FeCl 3为原料制备低温煤气化活性铁催化剂的新方法。通过使用三种添加剂（尿素、Ca（OH）2和氨）和水解，铁催化剂可能以FeOOH的形式从FeCl 3的水溶液中沉淀到褐煤上。Ca（OH）2的使用给出了高度分散的、活性最高的铁催化剂，其在973 K和5重量% Fe下在60分钟内在蒸汽中实现完全气化。催化剂活性最高时的比气化速率约为无催化剂时的20倍，并随反应进行而增加。X射线衍射测量表明，Fe3O4是整个气化过程中的稳定物种，无论催化剂的制备方法。这些催化剂的催化效率的顺序和速率曲线的差异可以阐明的基础上的Fe 3 O 4分散的程度。
A new method for preparing active iron catalysts for coal gasification at low temperatures has been studied by using FeCl3 as a raw material. Iron catalysts are precipitated onto brown coal probably in the form of FeOOH from an aqueous solution of FeCl3 by using three additives (urea, Ca(OH)2, and ammonia) and by hydrolysis. The use of Ca(OH)2 gives the highly dispersed, most active iron catalyst, which achieves complete gasification in steam within 60 min at 973 K and at 5 wt % Fe. The specific gasification rate with the most active catalyst is about 20 times that without catalyst, and it increases as the reaction proceeds. The X-ray diffraction measurements show that Fe3O4 is the stable species throughout the gasification regardless of the catalyst preparation method. The sequence of catalyst effectiveness and the difference in the rate profiles among these catalysts can be elucidated on the basis of the degree of Fe3O4 dispersion.