Topic
Cobalt
About: Cobalt is a research topic. Over the lifetime, 69899 publications have been published within this topic receiving 1242058 citations. The topic is also known as: Co & Element 27.
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TL;DR: In this paper, a fixed-bed catalytic co-pyrolysis of high density polyethylene, PP (polypropylene) and PET (polyethylene terephthalate) has been performed in a fixed bed reactor in presence of cobalt based alumina, ceria and ceria-alumina catalysts to analyze the product distribution and selectivity.
171 citations
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TL;DR: A comparison of the most active Co catalyst with an Ir catalyst stabilized by the same ligand indicates the superiority of Co, and unique selectivity toward C═O bonds in the presence of C═C bonds has been observed.
Abstract: The substitution of high-price noble metals such as Ir, Ru, Rh, Pd, and Pt by earth-abundant, inexpensive metals like Co is an attractive goal in (homogeneous) catalysis. Only two examples of Co catalysts, showing efficient C═O bond hydrogenation rates, are described. Here, we report on a novel, easy-to-synthesize Co catalyst family. Catalyst activation takes place via addition of 2 equiv of a metal base to the cobalt dichlorido precatalysts. Aldehydes and ketones of different types (dialkyl, aryl-alkyl, diaryl) are hydrogenated quantitatively under mild conditions partially with catalyst loadings as low as 0.25 mol%. A comparison of the most active Co catalyst with an Ir catalyst stabilized by the same ligand indicates the superiority of Co. Unique selectivity toward C═O bonds in the presence of C═C bonds has been observed. This selectivity is opposite to that of existing Co catalysts and surprising because of the directing influence of a hydroxyl group in C═C bond hydrogenation.
171 citations
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TL;DR: The reduction of CoClz(aq) with NaBH4 yields ultrafine particles of CozB as the primary product if the two reagents are rapidly mixed and the product is handled under argon.
Abstract: The reduction of CoClz(aq) with NaBH4 yields ultrafine particles of CozB as the primary product if the two reagents are rapidly mixed and the product is handled under argon. However, the CozB is converted to Co(s) particles plus boron oxides if exposed to oxygen (sacrificial reaction where boron is oxidized while cobalt is reduced). Still a third product, Co(BOz)z, can be formed if time is allowed for the Co2+/CozB catalysis of the aqueous BH4BOz-(aq) oxidation to occur before the major part of the CoClz(aq) is added. The Co(B02)~ is converted to Co3(B0& and small amounts of Co on heat processing at 500 "C.
171 citations
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TL;DR: In this article, a process consisting of a set of new catalysts with optimised process conditions for the maximum production of highly pure bis(2-hydroxyethyl) terephthalate (BHET) via glycolysis was demonstrated.
171 citations
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TL;DR: In this paper, manganese oxides with a cryptomelane-type octahedral molecular sieve (OMS-2) structure were used to replace platinum as a cathode catalyst in microbial fuel cells.
171 citations