Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation
Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation
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DOI：
10.1039/c3ra41660g
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发表时间：
2013-09
期刊：
影响因子：
3.9
通讯作者：
Jiajian Gao;Chunmiao Jia;Meiju Zhang;Fangna Gu;Guangwen Xu;Z. Zhong;F. Su
中科院分区：
文献类型：
--
作者：
Jiajian Gao;Chunmiao Jia;Meiju Zhang;Fangna Gu;Guangwen Xu;Z. Zhong;F. Su
本文报道了以炭黑为硬模板，采用共沉淀法制备高比表面积六铝酸钡（BaO-HSA）（>100 m2·g-1）的简单方法。考察了NiO负载量为10、20和40 wt%的Ni/BHA-HSA（Ni/BHA-HSA）催化剂在CO甲烷化制合成天然气（SNG）反应中的催化性能。CO甲烷化反应在0.1和3.0 MPa下进行，重时空速为30 000 mL g（-1）h（-1）。发现Ni/BHA-HSA催化剂与具有相同NiO负载量的更常规的Ni/BHA催化剂相比在低温（240-400 ° C）下显示出增加的活性。在400 ℃和3.0 MPa下，Ni/BHA-HSA（40 wt% NiO负载）可以获得95.7%的最高CH 4产率，并且寿命测试表明，在500 ℃和3.0 MPa下，它比Ni/BHA更稳定。Ni纳米粒子的严重团聚是导致后者失活的主要原因。结果表明，以炭黑为硬模板剂可以有效地制备出BHA-HSA，且BHA-HSA更适合作为CO甲烷化的Ni催化剂载体。
We report the simple preparation of the barium hexaaluminate (BaO center dot 6Al(2)O(3), BHA) with high surface area (BHA-HSA) (>100 m(2) g(-1)) through a coprecipitation method using carbon black as the hard template. Ni catalysts supported on BHA-HSA (Ni/BHA-HSA) with different NiO loadings (10, 20, and 40 wt%) were investigated in CO methanation for the production of synthetic natural gas (SNG). The CO methanation reaction was carried out at 0.1 and 3.0 MPa with a weight hourly space velocity of 30 000 mL g(-1) h(-1). It was found that Ni/BHA-HSA catalysts showed increased activity at low temperature (240-400 degrees C) compared with more conventional Ni/BHA catalysts with the same NiO loadings. A highest CH4 yield of 95.7% can be obtained over Ni/BHA-HSA (40 wt% of NiO loading) at 400 degrees C and 3.0 MPa, and a lifetime test shows that, at 500 degrees C and 3.0 MPa, it is more stable than Ni/BHA. The serious aggregation of Ni nanoparticles is the major reason for the deactivation of the latter. The work demonstrates that BHA-HSA can be effectively prepared using carbon black as the hard template and is more suitable as a Ni catalyst support for CO methanation.