Slurry-phase hydrocracking of vacuum residue with a disposable red mud catalyst
Slurry-phase hydrocracking of vacuum residue with a disposable red mud catalyst
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DOI：
10.1016/j.apcata.2012.09.043
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发表时间：
2012-12
影响因子：
5.5
通讯作者：
Chinh Nguyen-Huy;Hyukmin Kweon;Hanna Kim;Do Kyoung Kim;Do-Woan Kim;Seung-Hoon Oh;E. Shin
中科院分区：
文献类型：
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作者：
Chinh Nguyen-Huy;Hyukmin Kweon;Hanna Kim;Do Kyoung Kim;Do-Woan Kim;Seung-Hoon Oh;E. Shin
以赤泥（RM）为催化剂，对间歇式真空渣油（VR）的浆相加氢裂化进行了研究。在没有RM的情况下，会发生热裂解，比有催化剂的情况下馏分更轻，转化率更高。而催化裂化对焦炭形成和渣油裂化反应均有明显抑制作用。考察了反应温度、反应时间和RM浓度对VR转化率的影响。反应温度和反应时间显著提高了石脑油、柴油和真空气油的收率；不幸的是，他们也增加了气体的比例，这是一个不希望的产物。催化剂浓度对VR转化率的影响可以忽略不计，而产品分布中的真空气油分数随着催化剂浓度的增加而增加，说明在催化剂存在下，裂化反应受到抑制。通过各种技术对新鲜和废催化剂的表征，已经确定，由于VR中存在硫，RM的结晶氧化铁转化为磁黄铁矿（Fe(x−1)Sx），这是加氢裂化反应的活性相。我们的结果表明，在反应过程中，RM可能是自激活的，可以消除预处理步骤。
In this study, red mud (RM) was used as a catalyst in slurry-phase hydrocracking of vacuum residue (VR) in batch system. Without RM, thermal cracking occurred and a lighter fraction and higher conversion was achieved than in the presence of catalyst. However, the catalytic cracking obviously inhibited both the coke formation and residue cracking reaction. We investigated the influence of reaction temperature, reaction time and RM concentration on VR conversion. Reaction temperature and time significantly improved the yield of naphtha, diesel and vacuum gas oil; unfortunately, they also increased the gas fraction, which is an undesirable product. Catalyst concentration negligibly affected the VR conversion while vacuum gas oil fraction in product distribution increased with catalyst concentration, indicating that the cracking reaction was suppressed in the presence of catalyst. Through the characterization of fresh and spent catalysts by diverse techniques, it has been determined that the crystalline iron oxide of RM transforms into pyrrhotite (Fe(x−1)Sx), an active phase for the hydrocracking reaction, due to presence of sulfur in VR. Our results show that RM is possibly self-activated during the reaction and the pretreatment step can be eliminated.