以杉木为原料在金属改性分子筛作用下进行热解制备芳烃,采用热裂解-气相色谱质谱法进行热解。结果表明：单金属改性中5% Zn/HZSM-5可达到最好催化效果,其芳烃的相对峰面积达到最高的34.17%,苯、二甲苯的产率相对最高;与单金属改性相比,1% Zn-4% Co/HZSM-5可增大单环芳烃产率,其中苯增大1.19倍,甲苯增大1.21倍;萘、甲基萘等大分子芳烃产率显著减小,同时氧化物产率减少。验证不同金属结合会产生某种协同效应,在热解过程中添加双金属改性分子筛有利于热解油品位的提高。通过NH3-TPD表征和BET测试阐述金属改性对催化剂表面结构及酸位点变化的影响。
Abstract
Aromatic hydrocarbons were prepared from Cunninghamia lanceolata under the action of metal modified molecular sieves. Pyrolysis and gas chromatography-mass spectrometry were used for pyrolysis. The experimental results show that 5% Zn/HZSM-5 in the modification of single metal reached the best catalytic effect, and the relative peak area of aromatic hydrocarbon reached the highest 34.17%, and the yield of benzene and xylene was the highest. Compared with single metal modification, 1% Zn-4% Co/HZSM-5 increased the yield of PAHs, so that benzene and toluene were 1.19 times and 1.21 times of the original. The yield of macromolecular aromatics such as naphthalene and methyl naphthalene decreased significantly, as well as the yield of oxides. It is verified that the combination of different metals will produce a certain synergistic effect, and the addition of bimetallic modified molecular sieves in the pyrolysis process is beneficial to the improvement of pyrolysis oil grade. The possible mechanism of the yield change of aromatic hydrocarbons and oxygen-containing organic compounds was described by using NH3-TPD.
关键词
生物质 /
催化裂解 /
芳烃 /
沸石分子筛 /
化学改性
Key words
biomass /
catalytic cracking /
aromatic hydrocarbons /
zeolite molecular sieve /
chemical modification
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