Al/Ce和Al/Zr共掺杂Fe_2O_3催化剂用于煤焦油蒸汽催化裂解提质（英文）

Upgrading of coal tar with steam catalytic cracking over Al/Ce and Al/Zr co-doped Fe_2O_3 catalysts

蒸汽催化裂化(SCC)为煤焦油的提质提供了一种重要的方法。本研究以Al/Ce和Al/Zr共掺杂Fe_2O_3为催化剂研究了其在反应温度550℃、反应时间1 h下蒸汽催化裂化提质煤焦油的性能。催化剂表征显示掺杂的Fe_2O_3催化剂具有较小的晶粒粒径、较大的比表面积和孔体积。XPS表征表明,晶格氧是主要的活性氧物种,掺杂可以增加O^-的浓度。催化蒸汽裂化结果表明,Al/Ce和Al/Zr共掺杂可以提高Fe_2O_3催化活性。轻焦油(沸点低于360℃)在Fe AlZr1、Fe AlZr2、Fe AlCe1和Fe AlCe2上的产率分别为63. 2%、58. 1%、60. 2%和55. 1%,高于Fe_2O_3上的产率49. 7%。来自水蒸气解离和催化剂中的活性氧共同参与了煤焦油的改质。催化剂的比表面积和O-含量是决定蒸汽催化裂化性能的主要因素。

The upgrading of coal tar by means of steam catalytic cracking (SCC) is a promising method. In this study, Al/Ce and Al/Zr co-doped Fe2O3 catalysts were prepared and used for SCC of coal tar for improving the light tar yield. The SCC was conducted at 550 ℃ for 1 h. It was found that the crystal size decreased over doped Fe2O3 catalysts, and the pore volume and specific surface area increased. XPS analysis showed that lattice oxygen was the majority oxygen species and doping can increased the O - concentration. It was shown that Al/Ce and Al/Zr co-doped Fe 2O 3 could improve the catalytic activity of Fe 2O 3. The light tar yield over FeAlZr1, FeAlZr2, FeAlCe1 and FeAlCe2 were 63.2%, 58.1%, 60.2% and 55.1%, respectively, higher than that on Fe 2O 3 being 49.7%. The oxygen species from steam dissociation and Fe 2O 3 could take part in the upgrading of coal tar. It was revealed that the specific surface area and the O - on the Fe 2O 3 catalysts were the primary factors in determining the SCC performance.