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题名: Cobalt carbide nanoprisms for direct production of lower olefins from syngas
作者: Zhong, Liangshu1; Yu, Fei1, 2; An, Yunlei1, 2; Zhao, Yonghui1; Sun, Yuhan1, 3; Li, Zhengjia1, 4; Lin, Tiejun1; Lin, Yanjun1; Qi, Xingzhen1; Dai, Yuanyuan1, 5; Gu, Lin6; Hu, Jinsong5, 7; Jin, Shifeng6; Shen, Qun1; Wang, Hui1
刊名: NATURE
发表日期: 2016-10-06
卷: 538, 期:7623, 页:84-+
收录类别: SCI
英文摘要: Lower olefins-generally referring to ethylene, propylene and butylene-are basic carbon-based building blocks that are widely used in the chemical industry, and are traditionally produced through thermal or catalytic cracking of a range of hydrocarbon feedstocks, such as naphtha, gas oil, condensates and light alkanes(1,2). With the rapid depletion of the limited petroleum reserves that serve as the source of these hydrocarbons, there is an urgent need for processes that can produce lower olefins from alternative feedstocks(3-9). The 'Fischer-Tropsch to olefins' (FTO) process has long offered a way of producing lower olefins directly from syngas-a mixture of hydrogen and carbon monoxide that is readily derived from coal, biomass and natural gas(3-7). But the hydrocarbons obtained with the FTO process typically follow the so-called Anderson-Schulz-Flory distribution, which is characterized by a maximum C-2-C-4 hydrocarbon fraction of about 56.7 per cent and an undesired methane fraction of about 29.2 per cent (refs 1, 10-12). Here we show that, under mild reaction conditions, cobalt carbide quadrangular nanoprisms catalyse the FTO conversion of syngas with high selectivity for the production of lower olefins (constituting around 60.8 per cent of the carbon products), while generating little methane (about 5.0 per cent), with the ratio of desired unsaturated hydrocarbons to less valuable saturated hydrocarbons amongst the C-2-C-4 products being as high as 30. Detailed catalyst characterization during the initial reaction stage and theoretical calculations indicate that preferentially exposed {101} and {020} facets play a pivotal role during syngas conversion, in that they favour olefin production and inhibit methane formation, and thereby render cobalt carbide nanoprisms a promising new catalyst system for directly converting syngas into lower olefins.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35424
Appears in Collections:分子纳米结构与纳米技术实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Adv Res Inst, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201203, Peoples R China
2.Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China
3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201203, Peoples R China
4.East China Normal Univ, Sch Chem & Mol Engn, Shanghai 200062, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
7.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China
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