中文摘要：

考察了Mo和Ni改性的HZSM-5催化剂对煤热解焦油的改质性能,分析了催化改质前后焦油中轻质芳烃分布的变化规律。结果表明,经HZSM-5催化剂褐煤（XM）热解轻质芳烃总量的增加率为220%,这与煤热解产物在HZSM-5催化剂中发生烯烃和烷烃的芳构化以及酚羟基脱除等作用有关。负载活性金属Mo和Ni后,可以有效促进轻质芳烃的生成;Ni对焦油中带脂肪侧链化合物具有更强的裂解作用,而Mo则有利于带侧链化合物如甲苯和二甲苯的形成。焦煤（FX）热解过程中轻质芳烃的释放量分别是XM煤和年轻烟煤（PS）的2.2和2.4倍。经催化改质后,XM煤产物中轻质芳烃产率明显大于PS煤,并接近FX煤;这主要是因为XM煤结构中含有较多的含氧官能团和脂肪结构,在HZSM-5作用下可催化形成轻质芳烃。

英文摘要：

The distributions of light aromatic hydrocarbons in the gaseous tar were investigated upon upgrading over Mo and Ni-modified HZSM-5 catalysts during coal pyrolysis. The results showthat the yield of light aromatic hydrocarbon from lignite（ XM） pyrolysis is increased by 220% after the cracking of gaseous tar over HZSM-5 zeolite,due to the aromatization of olefins or alkanes and the dehydroxylation of phenols. The loading of Mo and Ni on HZSM-5 is able to enhance the formation of light aromatic hydrocarbons; Ni can obviously promote the side chain cracking,whereas Mo is more effective for the formation of aromatic compounds with side chains such as toluene and xylene. Without catalysts,the yield of light aromatic hydrocarbons from coking coal（ FX） pyrolysis is about 2. 2 and 2. 4 times higher than that from XMand bituminous coal（ PS） pyrolysis,respectively. By using catalysts,however,the yield of light aromatic hydrocarbons from XMpyrolysis is obviously higher than that from PS pyrolysis and close to that from FX pyrolysis,as XMis provided with abundant oxygen containing functional group and aliphatic structure that can be transformed to light aromatic hydrocarbons over the HZSM-5 catalysts.