A multifaceted role of a mobile bismuth promoter in alcohol amination over cobalt catalysts,Green Chemistry

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A multifaceted role of a mobile bismuth promoter in alcohol amination over cobalt catalysts
Green Chemistry ( IF 9.3 ) Pub Date : 2020-05-26 , DOI: 10.1039/d0gc00937g
Feng Niu _{1,

2,

3,

4,

5} , Mounib Bahri _{6,

7,

8,

9} , Ovidiu Ersen _{6,

7,

8,

9} , Zhen Yan _{10,

11,

12,

13} , Bright T. Kusema _{10,

11,

12,

13} , Andrei Y. Khodakov _{1,

2,

3,

4,

5} , Vitaly V. Ordomsky _{1,

2,

3,

4,

5}

Affiliation

Promotion with small amounts of different elements is an efficient strategy for the enhancement of the performance of many heterogeneous catalysts. Supported cobalt catalysts exhibit significant activity in the synthesis of primary amines via alcohol amination with ammonia, which is an economically efficient and environmentally friendly process. Insufficient selectivity to primary amines, low activity and fast cobalt catalyst deactivation remain serious issues restricting the application of alcohol amination in the industry. In this work, we have discovered the multifaceted role of the bismuth promoter, which is highly mobile under reaction conditions, in 1-octanol amination over supported cobalt catalysts. First, the overall reaction rate was enhanced more than twice on promotion with bismuth. Second, the selectivity to primary amines increased 6 times in the presence of Bi at high alcohol conversion. Finally, the bismuth promotion resulted in extremely high stability of the cobalt catalyst. Characterization by XRD, temperature programmed reduction, STEM, CO chemisorption, BET, TGA and FTIR has showed that the enhancement of the catalytic performance on promotion with bismuth is due to better cobalt reducibility, easy removal of strongly adsorbed intermediates and products by the mobile promoter and suppression of amine coupling reactions resulting in secondary and tertiary amines.

中文翻译：

可移动的铋促进剂在钴催化剂上的醇胺化中的多重作用

用少量不同的元素促进是提高许多非均相催化剂性能的有效策略。负载的钴催化剂在通过用氨进行乙醇胺化，这是一种经济高效且环保的方法。对伯胺的选择性不足，活性低和钴催化剂失活快仍然是严重的问题，限制了醇胺在工业中的应用。在这项工作中，我们发现了铋促进剂在负载的钴催化剂上的1-辛醇胺化反应中在反应条件下具有高度可移动性的多重作用。首先，在铋促进下，总反应速率提高了两倍以上。第二，在高醇转化率下，在Bi存在下，对伯胺的选择性增加了6倍。最后，铋的促进导致钴催化剂的极高的稳定性。通过XRD表征，程序升温还原，STEM，CO化学吸附，BET，

更新日期：2020-07-06

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