X-ray studies of supported copper-aluminium catalysts

Ketchik, S. V.; Plyasova, L. M.; Seredkin, A. E.; Kostrov, V. V.; Morozov, L. N.

doi:10.1007/bf02061347

Cited by 13 publications

(5 citation statements)

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“…Reactive primacy, at low conversion and low temperature, is given to the route wherein CO 2 is hydrogenated to methanol (reaction ). In this particular sense, their results confirm those of the earlier Russian work , and those of ICI . Furthermore, these measurements are also consistent with those due to Kieffer et al and Denise et al, from earlier in the decade, as well as work from the same group which had appeared in 1984, obtained through different means.…”

Section: –1989supporting

confidence: 91%

Section: –1989mentioning

confidence: 60%

“…They found that physical mixtures of these two systems were significantly more active than either of the individual formulations. Moreover, it appears that much earlier, a similar report had been made from research conducted in Russia, 149,150 which had been noted in the extensive 1987 review of Bart and Sneeden. 151 As such, in a very short space of time, two rather divergent groups of opinions had arisen from what were, in essence, very similar experimental perspectives.…”

Section: Continuing Observations Of and Evidence For Synergies Betweenmentioning

confidence: 65%

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The Enigma of Methanol Synthesis by Cu/ZnO/Al₂O₃-Based Catalysts

Beck,

Newton,

van de Water

et al. 2024

Chem. Rev.

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The activity and durability of the Cu/ZnO/Al 2 O 3 (CZA) catalyst formulation for methanol synthesis from CO/CO 2 /H 2 feeds far exceed the sum of its individual components. As such, this ternary catalytic system is a prime example of synergy in catalysis, one that has been employed for the large scale commercial production of methanol since its inception in the mid 1960s with precious little alteration to its original formulation. Methanol is a key building block of the chemical industry. It is also an attractive energy storage molecule, which can also be produced from CO 2 and H 2 alone, making efficient use of sequestered CO 2 . As such, this somewhat unusual catalyst formulation has an enormous role to play in the modern chemical industry and the world of global economics, to which the correspondingly voluminous and ongoing research, which began in the 1920s, attests. Yet, despite this commercial success, and while research aimed at understanding how this formulation functions has continued throughout the decades, a comprehensive and universally agreed upon understanding of how this material achieves what it does has yet to be realized. After nigh on a century of research into CZA catalysts, the purpose of this Review is to appraise what has been achieved to date, and to show how, and how far, the field has evolved. To do so, this Review evaluates the research regarding this catalyst formulation in a chronological order and critically assesses the validity and novelty of various hypotheses and claims that have been made over the years. Ultimately, the Review attempts to derive a holistic summary of what the current body of literature tells us about the fundamental sources of the synergies at work within the CZA catalyst and, from this, suggest ways in which the field may yet be further advanced.

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Section: –1989supporting

confidence: 91%

Section: –1989mentioning

confidence: 60%

Section: Continuing Observations Of and Evidence For Synergies Betweenmentioning

confidence: 65%

See 1 more Smart Citation

The Enigma of Methanol Synthesis by Cu/ZnO/Al₂O₃-Based Catalysts

Beck,

Newton,

van de Water

et al. 2024

Chem. Rev.

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“…In order to distinguish the reducible CuO species, these species should be firstly separated from each other. It has been reported that CuO/Al 2 O 3 catalysts were treated with a 1 M (NH 4 ) 2 CO 3 solution to remove the isolated copper oxide unreacted with support, while the dispersed copper oxide and CuAl 2 O 4 were not removed [44,45]. Thus the as-synthesized CuO/CeO 2 catalysts were also attempt to be treated with a 1 M (NH 4 ) 2 CO 3 solution in the present work.…”

Section: Effect Of Ceo 2 Supports Prepared By Different Methods On Rementioning

confidence: 89%

“…It is proposed that, as presented in Scheme 1, when the oxygen vacancies expose themselves on the surface of ceria, the oxygen ions of CuO will be preferred to occupy the positions of oxygen vacancies, which are indispensable for stabilizing metals [47]. This process makes the copper approach the cerium, which leads to the distortion of the ceria lattice because of the presence of multiple cation-oxygen distances with respect to the single cation-oxygen bond distance seen in pure ceria [45], finally resulting in the increase of microstrain value and the evolution of Raman bands. It is properly the nature of so-called SMSI between copper oxide and ceria.…”

Section: Effect Of Ceo 2 Supports Prepared By Different Methods On Rementioning

confidence: 97%

Water–Gas Shift Reaction over CuO/CeO2 Catalysts: Effect of the Thermal Stability and Oxygen Vacancies of CeO2 Supports Previously Prepared by Different Methods

Zhan

Zheng

et al. 2009

Catal Lett

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A series of CuO/CeO 2 catalysts were prepared through a two-step process: (1) CeO 2 supports were firstly prepared by precipitation (P), hydrothermal (HT) and solgel (SG) methods, respectively; and (2) CuO was deposited on the above CeO 2 supports by deposition-precipitation method. The as-synthesized CeO 2 supports and CuO/CeO 2 catalysts were characterized by N 2 -physisorption, XRD, XPS, Raman, and H 2 -TPR. The CuO/CeO 2 catalysts were examined with respect to their catalytic activity for the water-gas shift reaction, and their catalytic activities are ranked as: CuO/CeO 2 -P [ CuO/CeO 2 -HT [ CuO/CeO 2 -SG. The results suggest that the CeO 2 prepared by precipitation (i.e., CeO 2 -P-300) has the best thermal stability and the most amounts of surface oxygen vacancies, which make the corresponding CuO/CeO 2 -P catalyst present the largest pore volume, the smallest crystal size of CuO, the highest microstrain (i.e., the highest surface energy) and the most amounts of active sites (i.e., the moderate copper oxide (crystalline) interacted with surface oxygen vacancies of ceria). Therefore, the catalytic activity of CuO/ CeO 2 catalysts, in nature, depends on the thermal stability and the number of surface oxygen vacancies of the CeO 2 supports previously prepared by different methods.

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