In-situ catalytic upgrading of coal pyrolysis tar coupled with CO2 reforming of methane over Ni-based catalysts
In-situ catalytic upgrading of coal pyrolysis tar coupled with CO2 reforming of methane over Ni-based catalysts
复制标题
镍基催化剂上煤热解焦油原位催化升级与甲烷 CO2 重整
DOI：
10.1016/j.fuproc.2018.04.022
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发表时间：
2018-08-01
影响因子：
7.5
通讯作者：
Hu, Haoquan
中科院分区：
文献类型：
--
作者：
Wang, Mingyi;Jin, Lijun;Hu, Haoquan
采用镍基催化剂将煤热解焦油原位催化裂解与甲烷CO2重整（CRM）相结合的方法对焦油进行改质，以提高轻质焦油产率。结果表明，镍基催化剂可同时催化煤焦油裂解和煤基煤，镍基催化剂上煤基煤中产生的中心点H和中心点CHx等自由基可与焦油催化裂解产生的自由基发生联合收割机结合，避免焦油过度裂解。结果表明，5 Ni/Al 2 O3催化剂（Ni/Al 2 O3，Ni质量分数为5%）具有较好的焦油裂解活性和CRM活性，对焦油的改质效果最好。与未改质焦油相比，5 Ni/Al 2 O3改质焦油的平均分子量由279 amu降低到193 amu，650 ℃时轻焦油（沸点< 360 ℃）含量和收率分别提高53%和32%。轻馏分含量明显增加，沥青含量明显降低。苯、酚、萘等轻组分含量均有所提高，长脂肪链和3、4环芳烃含量明显减少。改质催化剂中的活性组分对煤焦油改质效果有明显的影响。5 Ni/Al 2 O3比5Co/Al 2 O3和5 Fe/Al 2 O3具有更高的焦油含量和产率。
Tar was upgraded by integrating in-situ catalytic cracking of coal pyrolysis tar with CO2 reforming of methane (CRM) over Ni-based catalysts to improve light tar yield. The results showed that Ni-based catalysts can catalyze coal tar cracking and CRM simultaneously, and some radicals, like center dot H and center dot CHx, produced in CRM over Ni-based catalysts could combine with the radicals from catalytic cracking of tar to avoid excessive cracking of tar. The catalyst 5Ni/Al2O3 (Ni/Al2O3 with 5 wt% Ni) showed the best performance for tar upgrading owing to its appropriate activity of both tar cracking and CRM. Compared with non-upgrading tar, the average molecular weight of upgrading tar over 5Ni/Al2O3 decreases from 279 to 193 amu, and the content and yield of light tar (boiling point < 360 degrees C) over 5Ni/Al2O3 increase by 53% and 32% at 650 degrees C. The contents of light fractions increase and that of pitch decreases apparently. The light components, such as benzenes, phenols and naphthalenes, are all improved, and long aliphatic chains and aromatics with 3 or 4 rings have an obvious decrease. Active components in upgrading catalysts obviously affect the upgrading effect of coal tar. 5Ni/Al2O3 exhibits higher content and yield of light tar compared with 5Co/Al2O3 and 5Fe/Al2O3.