One-pot synthesis of ordered mesoporous Ni-V-Al catalysts for CO methanation
One-pot synthesis of ordered mesoporous Ni-V-Al catalysts for CO methanation
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一锅法合成有序介孔Ni-V-Al催化剂用于CO甲烷化
DOI：
10.1016/j.jcat.2015.04.003
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发表时间：
2015-06-01
影响因子：
7.3
通讯作者：
Su, Fabing
中科院分区：
文献类型：
--
作者：
Liu, Qing;Gao, Jiajian;Su, Fabing
防止负载型镍（Ni）催化剂中Ni颗粒的烧结和焦炭的形成是催化领域的一个巨大挑战。为了解决这一问题，在本工作中，我们设计并合成了一系列具有所需结构和组成的三元Ni-V-Al金属氧化物复合材料，例如，有序的介孔结构和不同的V含量。通过一锅蒸发诱导自组装法合成了该催化剂，并将其用于CO甲烷化反应制备合成天然气。结果表明，具有有序介孔结构的Ni-V-Al催化剂的催化性能优于具有有序介孔结构和无序介孔结构的氧化铝载体上的镍催化剂。在有序介孔Ni-V-Al催化剂中添加适量的钒氧化物，进一步提高了催化剂的CO甲烷化活性。在110 h常压寿命试验中，有序介孔Ni-V-Al催化剂的抗结焦和抗烧结性能均得到显著改善，这主要是由于Ni颗粒尺寸较小，
Preventing both the sintering of Ni particles and the coke formation in supported nickel (Ni) catalysts is a great challenge in catalysis. To address the problem, in this work, we have designed and synthesized a series of ternary Ni-V-Al metal oxide composites with desired structure and composition, for example, the ordered mesoporous structure and various V contents. The catalysts are synthesized via a facile one-pot evaporation-induced self-assembly strategy and are used in CO methanation reaction to produce synthetic natural gas. Our results showed that the Ni-V-Al catalysts with ordered mesopores have better catalytic properties than the impregnation-derived Ni catalysts supported on alumina supports with ordered mesopores or with unordered mesopores. The addition of proper amount of vanadium oxide in the ordered mesoporous Ni-V-Al catalysts further promotes the catalytic activity toward CO methanation. In a 110 h atmospheric-pressure lifetime test, the ordered mesoporous Ni-V-Al catalyst showed significant improvement in both anti-coking and anti-sintering, mainly because of the smaller Ni particle size (