Catalytic upgrading of ethanol to n-butanol over M-CeO2/AC (M = Cu, Fe, Co, Ni and Pd) catalysts

Wu, Xianyuan; Fang, Geqian; Liang, Zhe; Leng, Wenhua; Xu, Kaiyue; Jiang, Dahao; Ni, Jun; Li, Xiaonian

doi:10.1016/j.catcom.2017.06.016

Cited by 57 publications

(49 citation statements)

References 30 publications

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“…Our recent work demonstrated that the Pd-CeO 2 /AC catalyst had highers electivity towards n-butanol (67.6 %), but lower ethanol dehydrogenation activity (11.9 %) than those of the Cu-CeO 2 /AC and Ni-CeO 2 /AC catalysts. [55] Thus, the combination of two metals in the same catalyst, one that is active in ethanol dehydrogenation (such as Cu and Ni)a nd the other active in hydrogenation steps (such as Pd), might be considered as ap romising approach to design efficient catalysts for the production of n-butanol from ethanol.…”

Section: Research Prospectsmentioning

confidence: 99%

“…Thus, interesti ne xploring rare-earth-metal oxides( La 2 O 3 and CeO 2 )a sb asic modifiers of catalysts for the conversion of ethanol into n-butanol has increased considerably in recent years. [30,46,49,53,55,56] However,a ttention should also be paid to the development of suitable Lewis acid sites because the requirementfor the presence of strong base sites can be alleviated, if Lewis acid centers are present. Moreover,t he Lewis acidbase pairs, if introduced by the modifierors upport in the catalysts, would be affected by the properties of the metal loaded.…”

Section: Research Prospectsmentioning

confidence: 99%

“…[41-43, 46, 55, 56b] Concerning this point, Cu-based catalysts are more preferable in the upgrading of ethanol to n-butanol because the cleavage of CÀCb onds is not favorable over Cu metal. [49,53,55] However,t he greatest problem for supported copperc atalysts is the rapid sintering and growth of copper nanoparticles. [59] It is known that metal particleg rowth is a major cause of deactivation for supported catalysts.…”

Section: Research Prospectsmentioning

confidence: 99%

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Catalytic Upgrading of Ethanol to n‐Butanol: Progress in Catalyst Development

et al. 2017

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Because n‐butanol as a fuel additive has more advantageous physicochemical properties than those of ethanol, ethanol valorization to n‐butanol through homo‐ or heterogeneous catalysis has received much attention in recent decades in both scientific and industrial fields. Recent progress in catalyst development for upgrading ethanol to n‐butanol, which involves homogeneous catalysts, such as iridium and ruthenium complexes, and heterogeneous catalysts, including metal oxides, hydroxyapatite (HAP), and, in particular, supported metal catalysts, is reviewed herein. The structure–activity relationships of catalysts and underlying reaction mechanisms are critically examined, and future research directions on the design and improvement of catalysts are also proposed.

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Section: Research Prospectsmentioning

confidence: 99%

Section: Research Prospectsmentioning

confidence: 99%

Section: Research Prospectsmentioning

confidence: 99%

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Catalytic Upgrading of Ethanol to n‐Butanol: Progress in Catalyst Development

et al. 2017

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“…Other metals were used in the preparation of M‐CeO 2 /AC catalysts but none gave a yield in butanol higher than Cu‐CeO 2 , although Pd showed a very high selectivity …”

Section: Guerbet Condensation Reactionsmentioning

confidence: 99%

“…Other metals were used in the preparation of M-CeO 2 /AC catalysts but none gave ay ield in butanol higher than Cu-CeO 2 ,although Pd showedavery high selectivity. [36] From these reports it is apparent that for designing ac atalyst fort he self-coupling of bioalcohols we can follow two strategies:T he first one is to use at ransition metal-free catalyst. In this case, only av ery fine tuning of the acidic and basic sites can lead to Guerbet products with very high selectivity.I n particularo ver hydroxyapatite based catalysts ar atio of acid to basic sites around 5w ould be ideal.…”

Section: Guerbet Condensation Reactionsmentioning

confidence: 99%

The Role of Copper in the Upgrading of Bioalcohols

2018

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Some recent results on Guerbet reactions are reported and a short review on dehydrogenative coupling of alcohols (DHC) is presented. The focus of this Minireview is on the role of acidic and basic sites and, in particular, on the role of Cu if it is present in the catalyst, taking into account that the two processes share the first step, namely alcohol dehydrogenation, whereas the second one is determining in driving selectivity towards self‐coupling or symmetrical ester formation. The main type of catalysts for the Guerbet reaction are based on hydrotalcites, hydroxyapatite and supported metal systems, whereas the catalysts for DHC are copper catalysts on different supports. The role of acidic and basic sites in determining activity and selectivity to Guerbet alcohols has been investigated and quite stringent requirements for the selectivity of the reaction have been highlighted. For DHC, we have focused on the role of the interaction of copper with the support, which in turn influences the distribution of acidic and basic sites. The morphology of the metallic phase has been suggested as a distinctive factor in promoting C−C coupling or C−O coupling in the second step for Cu‐containing catalysts.

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Copper‐Basic Sites Synergic Effect on the Ethanol Dehydrogenation and Condensation Reactions

et al. 2018

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Bioethanol upgrading through condensation is of key interest in the development of sustainable processes, shifting from fossil to renewable carbon. Here, a new strategy is proposed, which combines in one catalyst an appropriate distribution of acid/ basic sites of a mixed oxide with the presence of an active dehydrogenation phase (Cu nanoparticles). Experiments, performed in a fixed bed reactor, reveal a very positive effect of Cu in the performance of MgÀAl catalyst, with 1-butanol productiv-ity 12 times higher at 523 K under inert conditions. The improvement is even more notable in presence of H 2 , almost 30 times higher, under same conditions. The presence of Cu on the surface increases the formation of acetaldehyde, limiting the extent of dehydration side-reactions. In addition, hydrogen enhances the C4 hydrogenation, preventing oligomerizations and inhibiting decarbonylation steps that are directly related to the catalytic deactivation by poisoning.[a] J.

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Catalytic upgrading of ethanol to n-butanol over M-CeO2/AC (M = Cu, Fe, Co, Ni and Pd) catalysts

Cited by 57 publications

References 30 publications

Catalytic Upgrading of Ethanol to n‐Butanol: Progress in Catalyst Development

Catalytic Upgrading of Ethanol to n‐Butanol: Progress in Catalyst Development

The Role of Copper in the Upgrading of Bioalcohols

Copper‐Basic Sites Synergic Effect on the Ethanol Dehydrogenation and Condensation Reactions

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