用水滑石前驱体制备了Mg Fe O和Mg Fe Al O氧化物催化剂,研究了该催化剂在CO2气氛中乙烷脱氢催化活性。实验结果表明,添加Mg和Al元素有利于催化活性和乙烯收率的提高。MgFe0 5Al0 5Ox样品的活性较好,在700℃和V(CO2)/V(C2H6)=7时,乙烷...用水滑石前驱体制备了Mg Fe O和Mg Fe Al O氧化物催化剂,研究了该催化剂在CO2气氛中乙烷脱氢催化活性。实验结果表明,添加Mg和Al元素有利于催化活性和乙烯收率的提高。MgFe0 5Al0 5Ox样品的活性较好,在700℃和V(CO2)/V(C2H6)=7时,乙烷转化率20 6%,乙烯收率18 8%。CO2的作用是通过逆水煤气变换反应(CO2+H2 CO+H2O)推动乙烷脱氢反应并提高乙烯的选择性,通过CO2+C 2CO反应消除表面积炭提高催化剂的稳定性。展开更多
The influence of V2O3, FeO, TiO2, MnO and MgO in vanadium slag on the corrosion mechanism of MgO-C bricks was studied by stationary immersion tests at vanadium-extracting temperature. Experimental results show that Fe...The influence of V2O3, FeO, TiO2, MnO and MgO in vanadium slag on the corrosion mechanism of MgO-C bricks was studied by stationary immersion tests at vanadium-extracting temperature. Experimental results show that FeO, TiO2, and MnO could enhance the corrosion rate and V2O3 and MgO could decrease it. Microstructure and phase composition of worn samples were investigated by SEM-EDS, revealing the presence of Fe particles, produced by graphite reduction, and (Mg,Fe,Mn)O solid solution at the interface. The formation process of (Mg,Fe,Mn)O solid solution was discussed and the corrosion mechnism of MgO-C bricks was thus proposed.展开更多
文摘用水滑石前驱体制备了Mg Fe O和Mg Fe Al O氧化物催化剂,研究了该催化剂在CO2气氛中乙烷脱氢催化活性。实验结果表明,添加Mg和Al元素有利于催化活性和乙烯收率的提高。MgFe0 5Al0 5Ox样品的活性较好,在700℃和V(CO2)/V(C2H6)=7时,乙烷转化率20 6%,乙烯收率18 8%。CO2的作用是通过逆水煤气变换反应(CO2+H2 CO+H2O)推动乙烷脱氢反应并提高乙烯的选择性,通过CO2+C 2CO反应消除表面积炭提高催化剂的稳定性。
基金Item Sponsored by National Natural Science Foundation of China (51090382)
文摘The influence of V2O3, FeO, TiO2, MnO and MgO in vanadium slag on the corrosion mechanism of MgO-C bricks was studied by stationary immersion tests at vanadium-extracting temperature. Experimental results show that FeO, TiO2, and MnO could enhance the corrosion rate and V2O3 and MgO could decrease it. Microstructure and phase composition of worn samples were investigated by SEM-EDS, revealing the presence of Fe particles, produced by graphite reduction, and (Mg,Fe,Mn)O solid solution at the interface. The formation process of (Mg,Fe,Mn)O solid solution was discussed and the corrosion mechnism of MgO-C bricks was thus proposed.
