Effection Of Iron-based Catalysts On Distributions Of The Products Of Nantaizi Coal Pyrolysis

As a research object of Nantaizi YiLi coal, we investigated the effect of theiron-based catalysts, such as Fe₂O₃,oil-soluble of Fe₂O₃,Fe₂S₃,FeS,ores andFe(NO₃)₃on the products distribution of this coal pyrolysis, with the atmosphere ofH₂and N2. We also taking Ni(NO₃)₂as a contrast catalyst.At first, we investigated the effects of the pyrolysis temperature and the reactiveatmosphere on the distributions of the pyrolysis products. From these experimentalresults, we could ensure that650℃could be the appropriate temperature of coalcatalytic pyrolysis, and the suitable atmosphere was H₂. With this kind of reactionconditions, the char yields reached62.60%, the tar yields reached11.87%, the gasyields reached17.57%, and the water yields reached7.96%. When the reactiveatmosphere was N2, we take its products distributions as comparison, its char yieldsreached65.05%, the tar yields reached9.7%, the gas yields reached17.10, and thewater yields reached8.14%.Secondly, when the temperature was650℃and the reactive atmosphere was H₂,we investigated the effects of iron-based catalysts Fe₂O₃,Fe₂O₃+S,oil-soluble ofFe₂O₃, Fe₂S₃,FeS,pyrite,sulfur concentrate,oolitic stone,sulfur concentrate+S,oolitic stone+S and Fe(NO₃)₃on the coal products distributions. And we weretaking Ni(NO₃)₂·6H₂O as a contrast catalyst. Moreover, we also investigatediron-based catalysts on products distributions when the reactive atmosphere was N2,inorder to make a comparison with the productions distribution when the reactiveatmosphere was H₂.The experiments result showed that:⑴as the reactive atmosphere was H₂, weconsidered iron-based catalysts as the research object,with the catalyst of Fe(NO₃)₃,we could get the lowest char yield which was55.16%, reduced percentage points of7.44. With the catalyst of oil-soluble of Fe₂O₃, we could get the largest tar yield whichwas16.22%, increased percentage points of4.35. With the catalyst of FeS, we could get the largest gas yield which was23.26%, increased percentage points of5.69. Andfor the catalyst of Ni(NO₃)₂, it had an important influence on the coal pyrolysis. Thechar yield was45.66%, reduced percentage points of16.94. The gas yield was27.02%, increased percentage points of9.45. And the tar yield changed just a little.⑵When the reactive atmosphere was N2, using iron-based catalysts, the oil-soluble ofFe₂O₃got the lowest char yield which was61.51%, reduced percentage points of3.92,and its tar yield was the largest which was12.05%, increased percentage points of2.47. And when the catalyst was Ni(NO₃)₂, the char yield was63.09%,reducedpercentage points of1.98. The tar yield was5.69%, reduced percentage points of4.01.And the gas yield was22.67%, increased percentage points of5.57.Finally, whichever the catalyst was, when the reactive atmosphere was H₂, thewater yield all increased. Especially when the catalyst was Ni(NO₃)₂, there had thebiggest growth, increased percentage points of8.29. When the reactive atmospherewas N2, the water yield nearly unchanged, even had a slightly reduced.