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Preparation of high-surface-area Ni/alpha-Al2O3 catalysts for improved CO methanation

机译：制备高表面积Ni /α-Al2O3催化剂以改善CO甲烷化

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We have developed a simple approach for the preparation of alpha-Al2O3 with a high surface area (AH) (about 44 m(2) g(-1)) through deposition-precipitation of aluminum nitrate on a carbon black hard template. The AH support was impregnated with a Ni precursor to obtain the Ni/alpha-Al2O3 catalyst (Ni/AH-I). The above catalyst preparation method was further simplified by one-pot co-precipitation of the nickel and aluminum precursors on the carbon template to obtain the AH-supported Ni catalyst (Ni/AH-C). The samples were characterized by nitrogen adsorption, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, H-2 temperature-programmed reduction and H2 temperature-programmed desorption. The catalytic test results showed that the both Ni/AH-I and Ni/AH-C catalysts exhibited much more enhanced catalytic performance in syngas methanation than a Ni catalyst supported on low-surface-area alpha-Al2O3 at both atmospheric and high pressures, and at a weight hourly space velocity (WHSV) of 30 000 mL g(-1) h(-1), as well as a good stability in a 50 h high-pressure stability test at an extremely high WHSV of 120 000 mL g(-1) h(-1). The test of accelerated aging indicated that Ni/AH-C showed both better hydrothermal stability and stronger resistance to sintering. This work demonstrates AH can be prepared with high feasibility using carbon black as the hard template, and is suitable as a Ni catalyst support for CO methanation.
机译：我们已经开发了一种简单的方法，可以通过在炭黑硬模板上沉积沉淀硝酸铝来制备具有高表面积（AH）（约44 m（2）g（-1））的α-Al2O3。 AH载体用Ni前体浸渍以获得Ni /α-Al2 O 3催化剂（Ni / AH-1）。通过在碳模板上一锅共沉淀镍和铝前体，进一步简化了上述催化剂的制备方法，从而获得了AH负载的Ni催化剂（Ni / AH-C）。通过氮气吸附，X射线衍射，透射电子显微镜，热重分析，H-2程序升温还原和H2程序升温脱附对样品进行表征。催化测试结果表明，在大气压和高压力下，Ni / AH-I和Ni / AH-C催化剂在合成气甲烷化中均表现出比负载在低表面积α-Al2O3上的Ni催化剂更高的催化性能，在30000 mL g（-1）h（-1）的时空速（WHSV）下，以及在120 000 mL g的极高WHSV的50 h高压稳定性测试中，具有良好的稳定性（-1）小时（-1）。加速时效试验表明，Ni / AH-C表现出更好的水热稳定性和更强的抗烧结性。这项工作表明，使用炭黑作为硬模板可以很好地制备AH，并且适合用作CO甲烷化的Ni催化剂载体。

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