Novel microfibrous‐structured silver catalyst for high efficiency gas‐phase oxidation of alcohols
Novel microfibrous‐structured silver catalyst for high efficiency gas‐phase oxidation of alcohols
复制标题
DOI：
10.1002/aic.12088
复制
发表时间：
2010-06
期刊：
影响因子：
3.7
通讯作者：
Jiping Mao;Miaomiao Deng;Li Chen;Ye Liu;Yong Lu
中科院分区：
文献类型：
--
作者：
Jiping Mao;Miaomiao Deng;Li Chen;Ye Liu;Yong Lu
开发了新型微纤维结构银催化剂，用于一元醇/芳香族醇/二元醇的气相选择性氧化。通过造纸/烧结工艺构建了由 5 vol% 8-μm-Ni（或 12-μm-SS-316L）纤维和 95 vol% 空隙体积组成的烧结锁定三维微纤维网络。然后通过初湿浸渍法将银沉积到烧结锁定纤维的表面上。在相对较低的温度（例如 380°C）下，与电解银相比，微纤维结构银催化剂提供了相当高的活性/选择性。微纤维银/镍纤维比银/不锈钢纤维具有更好的低温活性。 Ag颗粒与Ni-纤维界面的相互作用不仅显着增加了Ag+离子和Agnδ+团簇的活性/选择性位点，而且显着提高了它们的低温还原性和O2活化能力。此外，微纤维结构提供了大空隙体积、完全开放结构、高导热性和高渗透性的独特组合。 © 2009 美国化学工程师学会 AIChE J，2010
Novel microfibrous-structured silver catalysts were developed for gas-phase selective oxidation of mono-/aromatic-/di-alcohols. Sinter-locked three-dimensional microfibrous networks consisting of 5 vol % 8-μm-Ni (or 12-μm-SS-316L) fibers and 95 vol % void volume were built up by the papermaking/sintering processes. Silver was then deposited onto the surface of the sinter-locked fibers by incipient wetness impregnation method. At relatively low temperatures (e.g., 380°C), the microfibrous-structured silver catalysts provided quite higher activity/selectivity compared to the electrolytic silver. The microfibrous Ag/Ni-fiber offered much better low-temperature activity than the Ag/SS-fiber. The interaction at Ag particles and Ni-fiber interface not only visibly increased the active/selective sites of Ag+ ions and Agnδ+ clusters but also significantly promoted their low-temperature reducibility and ability for O2 activation. In addition, the microfibrous structure provided a unique combination of large void volume, entirely open structure, high thermal conductivity and high permeability. © 2009 American Institute of Chemical Engineers AIChE J, 2010