Preparation and characterization of Ni based catalysts for the catalytic partial oxidation of methane: Effect of support basicity on H2/CO ratio and carbon deposition
Preparation and characterization of Ni based catalysts for the catalytic partial oxidation of methane: Effect of support basicity on H2/CO ratio and carbon deposition
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DOI：
10.1016/j.ijhydene.2010.08.091
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发表时间：
2010-11
影响因子：
7.2
通讯作者：
H. Özdemir;M. F. Öksüzömer;M. A. Gürkaynak
中科院分区：
文献类型：
--
作者：
H. Özdemir;M. F. Öksüzömer;M. A. Gürkaynak
研究了镍基催化剂催化甲烷部分氧化（CPOM）。采用湿浸渍法制备了催化剂，并用AAS、BET、XRD、HRTEM、TPR、TPO、拉曼光谱和TPSR等技术对催化剂进行了表征。在空气为氧化剂，温度为800℃，温度为1atm， CH4/O2= 2，流量为157,500 （L kg−1h−1）时，催化剂的CH4转化率接近95%，h22选择性接近96%。载体碱度对H2/CO比和碳沉积影响较大。结果表明，Ni浸渍MgO催化剂的碳沉积最少。结果表明，Ni/Al2O3、Ni/MgO/Al2O3、Ni/ mgal2o4和Ni/山梨酸在较强还原条件下是制备CPOM的最佳催化剂。在最佳条件下，Ni/MgO表现出较差的性能，因此Ni/山梨酸具有较好的抗碳性能，是理想的催化剂。
The catalytic partial oxidation of methane (CPOM) was studied on Ni based catalysts. Catalysts were prepared by wet impregnation method and characterized by using AAS, BET, XRD, HRTEM, TPR, TPO, Raman Spectroscopy and TPSR techniques. The prepared catalysts showed nearly 95% CH4conversion and nearly 96% H2selectivity under the flow of 157,500 (L kg−1h−1) with the ratio of CH4/O2= 2 by using air as an oxidant at 1 atm and 800 °C. Support basicity greatly influenced the H2/CO ratio and carbon deposition. It was found that the lowest carbon deposition occurred on Ni impregnated MgO catalyst. Considering the results, it was found that Ni/MgO catalyst with 10% Ni content would be the best catalyst amongst Ni/Al2O3, Ni/MgO/Al2O3, Ni/MgAl2O4and Ni/Sorbacid for the CPOM only under more reductive conditions. Under optimum conditions, Ni/MgO showed poor performance and therefore Ni/Sorbacid would be the ideal catalyst because of its greater carbon resistance than the other catalysts.