类煤模型化合物在两种铁基催化剂作用下的热解

Pyrolysis behaviors of coal-related model compounds catalyzed by two iron-based catalysts

选取可以代表真实煤中典型弱键结构的苯乙醚和联苄作为类煤模型化合物,在固定床热解装置上研究了其在黄铁矿(pyrite)和Fe/ZSM-5这两种铁基催化剂作用下的热解行为。结果表明,两种催化剂均可以提高模型化合物的热解转化率,Fe/ZSM-5的催化效果要优于pyrite,在热解过程中明显促进了苯乙醚中Caliphatic—O键和联苄中Caryl—Caliphatic键的断裂;Fe的负载量为7.5%时,Fe/ZSM-5催化效果最好。在苯乙醚热解过程中,Fe/ZSM-5中载体分子筛起主要催化作用;而在联苄的热解过程中,Fe/ZSM-5中负载金属主要起催化作用。

The pyrolysis behaviors of coal-related model compounds(phenetole and bibenzyl)were investigated on a fixed-bed reactor catalyzed by pyrite and Fe/ZSM-5.The pyrolysis products were analyzed by gas chromatography-mass spectrometry(GC-MS)and gas chromatography(GC).By comparing the distribution of pyrolysis products,the possible catalytic pyrolysis mechanism of model compounds with two iron-based catalysts was proposed.The results indicated that both pyrite and Fe/ZSM-5 could increase the conversion of the model compounds and the yield of liquid and gas,while decrease the char yield.When the loading amount of iron was 7.5%,the catalytic effect of Fe/ZSM-5 was the best.Fe/ZSM-5 had a better catalytic performance than pyrite,which could promote the cleavage of C aliphatic—O bond of phenetole and C aryl—C aliphatic bond of bibenzyl,while pyrite had no obvious selectivity for pyrolysis reaction.The carrier molecular sieves of Fe/ZSM-5 played the main role in the pyrolysis process of phenetole,while the supported metals of Fe/ZSM-5 played the main role in the pyrolysis process of bibenzyl.