Synthesis, Characterization, and Activity Pattern of Ni-Al Hydrotalcite Catalysts in CO2 Methanation
Synthesis, Characterization, and Activity Pattern of Ni-Al Hydrotalcite Catalysts in CO2 Methanation
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DOI：
10.1021/acs.iecr.6b01581
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发表时间：
2016-08-03
影响因子：
4.2
通讯作者：
Centi, Gabriele
中科院分区：
文献类型：
--
作者：
Abate, Salvatore;Barbera, Katia;Centi, Gabriele
采用共沉淀法在不同pH值下制备了两种镍铝水滑石样品(HTLCs)，并考察了其对二氧化碳加氢反应的催化性能。将新合成的样品与镍含量相同的氧化铝负载镍基工业催化剂进行了比较。用BET分析、原子吸收光谱(AAS)、X射线衍射仪(X射线衍射仪)和程序升温技术(H-2-TPR和CO-TPD)对制备的样品和工业样品进行了表征。在常压下，改变反应温度250~400℃，考察了样品对CO2加氢反应的催化活性。在300℃时，水滑石细胞获得的最大CO2转化率接近186%。HTLCs的优异性能与主要催化剂的还原性质、较高的金属比表面积和金属分散性有关。通过长期的实验考察了HTLCs的稳定性，在所报道的反应条件下获得了良好的稳定性。
Two nickel-aluminum hydrotalcite samples (HTLCs) were prepared by a coprecipitation method at different pH values and investigated as catalysts for the hydrogenation of carbon dioxide. The newly synthesized samples have been compared with a reference alumina supported nickel-based commercial catalyst, with equal nickel content. The as-prepared and commercial samples were characterized by BET analysis, atomic adsorption spectroscopy (AAS), X-ray diffraction (XRD), and temperature programmed techniques (H-2-TPR and CO-TPD). Catalytic activity of thee analyzed samples was investigated toward hydrogenation of CO2 at atmospheric pressure by varying reaction temperature between 250 and 400 degrees C. The maximum CO2-to-CH4 conversion value achieved by hydrotalcyte was approximate to 186% at 300 degrees C. The superior performance of HTLCs has been put in relationship with the major catalysts reducibility nature and with the higher metal surface area and metal dispersion. The stability of the HTLCs was investigated through long-term tests, resulting in good stability in the reported reaction conditions.