Nanotubular Gamma Alumina with High-Energy External Surfaces: Synthesis and High Performance for Catalysis
Nanotubular Gamma Alumina with High-Energy External Surfaces: Synthesis and High Performance for Catalysis
复制标题
具有高能外表面的纳米管γ氧化铝：合成和高性能催化
DOI：
10.1021/acscatal.7b00080
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发表时间：
2017-06-01
期刊：
影响因子：
12.9
通讯作者：
Xie, Zaiku
中科院分区：
文献类型：
--
作者：
Cai, Weimeng;Zhang, Shengen;Xie, Zaiku
具有高比例高能表面的无机纳米晶催化剂可以带来高的催化性能，在过去几十年中一直是一个重要的研究课题。γ-氧化铝是最重要的无机氧化物之一，用作固体酸或许多工业催化剂的催化载体。然而，由于γ-氧化铝具有复杂的晶体结构，因此其主要具有高能外表面的制备从未报道过。通过系统的研究，我们深入地展示了一种新型的γ-氧化铝材料，这种材料是可控合成的，是以高能{111}晶面为主要外表面的规则纳米管。这种新型材料作为酸催化剂或金属催化剂载体的性能比普通的γ-Al_2O_3（主要暴露表面为稳定的{100}或{110}晶面，且形貌不规则）有明显的提高。以新型γ-氧化铝为载体的钯催化剂具有分散度高、电性能好等优点。
Inorganic nanocrystals catalysts with a high proportion of high-energy surfaces can bring about high performance for catalysis and has been an important research topic in the past decades. Gamma alumina is one of the most important inorganic oxides used as solid acids or catalytic support for many more industrial catalysts. However, the preparation of gamma alumina mainly with high-energy external surfaces has never been reported because it has a complicated crystal structure. We demonstrate here in depth a new-type γ-alumina material from a systematic investigation, which is controllably synthesized as regular nanotubes with high-energy {111} facets as main external surfaces. The new-type material shows much better performance as acid catalyst or catalytic support for metals, as compared with common γ-alumina whose main exposed surface is stable {100} or {110} facets in irregular morphology. As an example, palladium loaded on the new-type γ-alumina is easily prepared in higher dispersion and unique elect...