反应温度对浆状NiW催化剂加氢处理中低温煤焦油加氢性能的影响

Effects of Reaction Temperatures on Performance of Slurry NiW Catalyst Hydrotreating Middle and Low Temperature Coal Tar

采用完全液相法制备了以AlOOH-TiO_2为载体、Ni和W为活性组分的浆状加氢处理催化剂,以全馏分中低温煤焦油作为反应原料,考察了反应温度对浆状NiW催化剂的浆态床加氢性能的影响,并利用热重(TG)法、元素分析法、红外光谱(FTIR)法及气相色谱-质谱联用(GCMS)法分析了原料和反应产物的馏分分布及化学组成.结果表明:当反应温度为380℃时,催化剂具有较高的加氢性能,液体收率高达94.40%,氢碳物质的量比为1.56.本研究中萘的主要加氢路径可能为萘→苯基环烷烃(PCA)→苯基烯烃(PO),酚的主要加氢路径可能为酚(P)→苯(AB)→单环烷烃(MCA).在360℃~420℃温度范围内,升高反应温度有利于煤焦油中杂原子的去除及大分子的裂解,但不利于不饱和有机化合物的加氢反应.

The slurry NiW catalysts with AlOOH-TiO2 as carrier,Ni and W as active constituent were prepared by complete liquid phase method,and they were tested for middle and low temperature coal tar hydrogenation in a slurry bed reactor to produce clean liquid fuel.The effects of reaction temperatures on the hydrogenation properties of coal tar were investigated,and the distribution and chemical composition of fractions from raw materials and reaction products were studied by the TG,ultimate analysis,FTIR and GC-MS.The results show that the catalyst has high hydrogenation properties when the reaction temperature is 380℃.The liquid yield is 94.40%and n(H)∶n(C)is 1.56.The main hydrogenation route of naphthalene may be naphthalene(AN)→phenyl cycloalkanes(PCA)→phenyl olefins(PO),and the main hydrogenation path of phenol may be phenol(P)→benzene(AB)→cycloalkanes(MCA).In the temperature range of 360℃-420℃,increasing the reaction temperature is beneficial to the hetero atom removal and macromolecules decomposition in coal tar,but it has a negative effect on hydrogenation of unsaturated organic compounds in coal tar.