Remarkably efficient CoGa catalyst with uniformly dispersed and trapped structure for ethanol and higher alcohol synthesis from syngas

Ning, Xun; An, Zhe; He, Jing

doi:10.1016/j.jcat.2016.05.014

Cited by 74 publications

(59 citation statements)

References 58 publications

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“…Linear ASF distributions are observed for alcohols and hydrocarbons over the entire C n range for each catalyst. The observation of the correlated α values is in agreement with a common mechanism of alcohol formation by CO insertion into the same type of intermediate for hydrocarbon formation . The α value for alcohol formation increases upon the addition of K to the catalyst from 0.11 to 0.22 at K/Mo = 0.5 and 0.26 at K/Mo = 1.1.…”

Section: Resultssupporting

confidence: 83%

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

et al. 2019

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Molybdenum phosphide (MoP) catalysts have recently attracted attention due to their robust methanol synthesis activity from CO/CO2. Synthesis strategies are used to steer MoP selectivity toward higher alcohols by investigating the promotion effects of alkali (K) and CO‐dissociating (Co, Ni) and non‐CO‐dissociating (Pd) metals. A systematic study with transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, and X‐ray absorption spectroscopy (XAS) showed that critical parameters governing the activity of MoP catalysts are P/Mo ratio and K loading, both facilitating MoP formation. The kinetic studies of mesoporous silica‐supported MoP catalysts show a twofold role of K, which also acts as an electronic promoter by increasing the total alcohol selectivity and chain length. Palladium (Pd) increases CO conversion, but decreases alcohol chain length. The use of mesoporous carbon (MC) support has the most significant effect on catalyst performance and yields a KMoP/MC catalyst that ranks among the state‐of‐the‐art in terms of selectivity to higher alcohols.

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Section: Resultssupporting

confidence: 83%

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

et al. 2019

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“…Comparing the peaks of Al−Co spinel revealed that all peaks of the Ga−Co spinel tended toward lower temperatures, indicating that the Ga in the Ga−Co spinel can promote the reduction of Co 3+ . The similar results were also reported by He et al . who studied the CoGa‐ZnAl‐LDO/γ‐Al 2 O 3 catalyst for higher alcohol synthesis from syngas.…”

Section: Bet Surface Areas Surface Element Compositions Oxygen Amousupporting

confidence: 89%

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Yang

Wang

et al. 2018

ChemCatChem

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Considering the radius similarity of Al 3 + (0.50 Å ) and Ga 3 + (0.62 Å ), AlÀCo and GaÀCo layered double hydroxides (LDH) was prepared as precursor to improve the synergetic interaction of the transition metals. The AlÀCo and GaÀCo spinel catalysts were obtained by the following calcination for the toluene oxidation. The GaÀCo (E a = 79.5 kJ mol À1 ) showed higher activity than the AlÀCo (E a = 95.4 kJ mol À1 ), and it exhibited excellent stability and resistance to carbon deposition during a 50 h reaction period at 300 8C. Characterization results indicated that the improved activity of GaÀCo spinel could be attributed to the higher reducibility (H 2 -TPR), more surface Co 3 + and adsorbed oxygen in quantity (XPS) and adsorbed toluene (Toluene-TPD) than AlÀCo spinel. Compared with traditional GaÀCo binary catalyst, the spinel structure possessed more Bsites cations outermost of the surface and surface oxygen vacancies for the toluene adsorption and ring-open reaction.

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“…In addition to achieving high dispersion of supported alloy nanoparticles, another challenging goal is increasing catalyst stability by inhibiting the sintering of active species. He and co‐workers prepared a CoGa‐alloy catalyst by calcination of a CoGaZnAl‐LDH precursor in a reducing atmosphere ( Figure ) . HRTEM images showed a mean particle size of 12.3 nm with a high degree of exposure of (111) facets.…”

Section: Supported Metal Catalysts Derived From Ldh Precursorsmentioning

confidence: 99%

“…C) SEM–EDS elemental mapping images for Co, Ga, and Zn of the corresponding region (yellow frame in (B)) of CoZnGaAl‐LDHs/γ‐Al 2 O 3 . All panels reproduced with permission . Copyright 2017, Elsevier.…”

Section: Supported Metal Catalysts Derived From Ldh Precursorsmentioning

confidence: 99%

Layered Double Hydroxide‐Based Catalysts: Recent Advances in Preparation, Structure, and Applications

Wei

2018

Adv Funct Materials

356

163

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Layered double hydroxides (LDHs) are a class of functional anionic clays, which consist of positively charged host layers (brucite-like M(OH) 6 octahedra) and interlayer anions. By virtue of their unique combination of structural features (including the tunability of both host layers and interlayer guest anion, exfoliation property, structure topological transformation, confinement effect), LDHs have many potential applications in heterogeneous catalysisas catalysts themselves, catalyst supports, or catalyst precursors. In addition, the properties of LDH-based catalysts can be tailored for specific purposes by facile modulation of their surface/interface defect structure (e.g., oxygen vacancy defects or metal defects), controlling the concentration/strength of surface acid/base sites, tuning the geometric/electronic structure of active sites, or by taking advantage of the confinement effect intrinsic to 2D materials. In addition, by utilizing the topological structural transformation of LDH precursors, supported metal catalysts can be obtained (as single metals, bimetallic alloys or heterostructures, and intermetallic compounds) with tunable particle size/morphology and intriguing electronic properties. The main focus of this review is on recent advances in structure design, preparation, and catalytic applications of LDH-based heterogeneous catalysts. In addition, future challenges and development strategies are discussed from the viewpoints of modulation of intrinsic active sites and establishment of scalable fabrication processes. activity, selectivity, and stability. [8,11,12] Therefore, by virtue of their unique combination of structural features (layered structure, compositional flexibility, tunable interlayer anions, and exfoliation properties) and their topological transformation, LDH materials have been widely studied as catalysts, catalyst precursors, and catalyst supports.This Review highlights recent developments in the design and preparation of LDH-based nanocatalysts (Figure 1) and their potential applications in heterogeneous catalysis. New synthetic approaches and exfoliation techniques for the preparation of LDH-based catalysts are first reviewed, with a strong emphasis on the ways in which the structure of the active sites (e.g., surface defect structure, interface structure, geometric/electronic structure, and preferential exposure of highly active facets) of LDHbased nanocatalysts can be precisely tailored. The identification and characterization of active sites as well as structure-property correlations are discussed in detail, since these provide helpful guidelines for the rational design and preparation of future highperformance heterogeneous catalysts. In the final section, future opportunities and challenges in the fabrication of LDH-derived catalysts are discussed in terms of structural design and control over intrinsic active sites, and some strategies to resolve these critical issues are proposed. It is hoped that this review will focus attention on new LDH-based catalysts and encourage...

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Remarkably efficient CoGa catalyst with uniformly dispersed and trapped structure for ethanol and higher alcohol synthesis from syngas

Cited by 74 publications

References 58 publications

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Development of Molybdenum Phosphide Catalysts for Higher Alcohol Synthesis from Syngas by Exploiting Support and Promoter Effects

Promotion Effect of Ga−Co Spinel Derived from Layered Double Hydroxides for Toluene Oxidation

Layered Double Hydroxide‐Based Catalysts: Recent Advances in Preparation, Structure, and Applications

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