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具有稳定Ni颗粒的棒状Ni/La_2O_3催化剂在甲烷干气重整中的应用
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摘要
棒状Ni/La_2O_3催化剂采用La_2O_2CO_3纳米棒作为载体前驱体(表示为Ni/La_2O_3-LOC),采用湿法浸渍方法进行制备,并将其应用于甲烷干气重整(DRM)中。结果显示经La_2O_2CO_3前驱体制备的La_2O_3在经过热处理后仍能维持棒状形貌,并且能够高度分散负载在其上的镍颗粒。另外,棒状载体能够提供更多的中性强度碱性位点促进CO_2在载体上的吸附。Ni颗粒和La_2O_3之间的强相互作用限制了Ni颗粒在严酷反应条件下的烧结。同时,也对积碳在催化剂上的演变历程加以探讨。由于Ni/La_2O_3-LOC上Ni颗粒分布优良,没有发现非纤维状积碳的明显形成,并且在反应过程中形成的La_2O_2CO_3也及时到参与消除积碳过程中。
Ni/La_2O_3 catalyst using La_2O_2CO_3 nanorods as support precursor(denoted as Ni/La_2O_3-LOC) were prepared via a wet impregnation method for dry reforming of methane(DRM).The results showed that La_2O_3 derived from the La_2O_2CO_3 precursor maintained its initial morphology upon thermal treatment and could highly disperse supported Ni particles.Additionally,the nanorod-shaped support could provide more medium basic sites to facilitate CO_2adsorption on its surface.The strong interaction between Ni and La_2O_3 restricted the growth of nickel particles under harsh reaction conditions.Coke evolution on the catalysts was also investigated.Due to high nickel dispersion of Ni/La_2O_3-LOC,no obvious formation of non-filamentous coke was detected and La_2O_2CO_3 formed during the DRM process participated to eliminate coke deposition.
引文
[1]Huang,X.;Dang,C.;Yu,H.;Wang,H.,Peng,F.ACS Catal.2015,5:1155.
    [2]Montero,C.;Ochoa,A.;Casta?o,P.;Bilbao,J.;Gayubo,A.G.J.Catal.2015,331:181.

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