What is the evidence of the use of Ga to reduce the crystal size of aurichalcite?

The peak broadening in the XRD patterns with the increase in Ga concentration provides evidence of the use of Ga to reduce the crystal size of aurichalcite phase.

How much Ga is needed to form ultra-thin AMO-LDH sheets?

It is noted that using 30 mol% Ga in the synthesis recipe is appropriate to form ultra-thin AMO-LDH sheets (by the AMOST method) than the other two AMO-LDH samples (20% and 40% Ga) as the stability of LDH structure depends critically on the overall charge of the cationic layer with specific M3+:M2+ ratio balanced with intercalated anions43.

What is the effect of the cationic layer on Cu particles?

This discrete cationic layer can facilitate the formation of small (~4 nm) and homogeneous Cu particles decorated with trace Zn atoms with narrow size distribution, which lead to higher CO2 conversion and methanol production.

What is the formula for a layered double hydroxide phase?

It has been shown that monophasic catalyst precursor containing M2+ and M3+ could be obtained by controlled thermal treatment of a layered double hydroxide phase (LDH), which is a class of ionic lamellar solid often represented by the formula [M2+1−xM3+x(OH)2]

What is the reason for the peak shifts observed in the AMO-LDH samples?

the peak shifts observed in the AMO-LDH samples from both Ga 2p and Cu 2p could be attributed to the morphological changes as the formation of pure-LDH phases from amorphous (when Ga > 20%), and the following changes in platelet thickness/size when further increasing the Ga content.

What is the role of Cu and Zn in the hydrogenation of methanol?

In the literature, it has been suggested that Cu/Zn interface plays a significant role in CO2 hydrogenation to methanol as these two species (Cu and Zn) work synergistically.

What are the important aspects for the catalyst development?

the generation of small Cu particles and their stabilization against Cu sintering under reaction conditions are the important aspects for the catalyst development.

What is the morphology of the reduced catalysts?

In line with the morphology observation of the reduced catalysts, the reduction behaviour of the AMO-LDH samples, see Fig. 4, displays more uniform peak profiles compared to the CZG samples, implying a more homogeneous reduction environment in the AMO-LDH matrix.

What is the effect of the lower temperature shoulder on Cu particle size in CZG precursors?

Such a large variation in reduction behaviour of Cu+ and Cu2+ in heterogeneous mixture of extended lattices would expect to induce large Cu particle size variation in the CZG precursor-derived catalysts.

What is the main difference between the CZG and LDH samples?

This observation suggests that the catalytic conversion of CO2 to methanol of the CZG sample may not only be dependent on copper surface area but also on other factors, presumably on structural and compositional differences of nanoparticles (structural sensitive).

Open AccessJournal Article10.1021/ACSCATAL.8B00474

CO2 Hydrogenation to Methanol over Catalysts Derived from Single Cationic Layer CuZnGa LDH Precursors

Molly Meng Jung Li, +9 more

- 06 Apr 2018

- ACS Catalysis

- Vol. 8, Iss: 5, pp 4390-4401

156

TL;DR: In this article, the aqueous miscible organic solvent treated double hydroxide (LDH) nanosheets were synthesized following the AMO-LDH method and applied as catalyst precursors for methanol production from CO2 hydrogenation.

Abstract: Ultrathin (1–3 cationic-layers) (CuZn)1–xGax-CO3 layered double hydroxide (LDH) nanosheets were synthesized following the aqueous miscible organic solvent treatment (AMOST) method and applied as catalyst precursors for methanol production from CO2 hydrogenation. It is found that, upon reduction, the aqueous miscible organic solvent treated LDH (AMO-LDH) samples above a critical Ga3+ composition give consistently and significantly higher Cu surface areas and dispersions than the catalysts prepared from conventional hydroxyl-carbonate phases. Owing to the distinctive local steric and electrostatic stabilization of the ultrathin LDH structure, the newly formed active Cu(Zn) metal atoms can be stably embedded in the cationic layers, exerting an enhancement to the catalytic reaction. The best catalyst in this study displayed methanol productivity with a space-time yield of 0.6 gMeOH·gcat–1 h–1 under typical reaction conditions, which, as far as we are aware, is higher than most reported Cu-based catalysts in t...

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Most frequently asked questions

1. What are the contributions mentioned in the paper "Co2 hydrogenation to methanol over catalysts derived from single cationic layer cuznga ldh precursors" ?

In this paper, it has been shown that the incorporation of Ga has attracted a considerably attention due to the exhibition of its higher catalytic performance.

2. What is the catalytic activity of Cu?

Its catalytic activity is a function of surface area to volume ratio (inversely proportional to the particle size) due to the fact that catalysis is a surface phenomenon5,6.

3. What is the reason for the formation of Cu nanoparticles in the catalytically?

The authors believe the formation of Cu nanoparticles in the catalytically active size domain with narrow size distribution is related to a delicate control of nucleation and growth.

4. What is the role of Zn on the structure of Cu nanoparticles?

Due to the rapid development of advanced characterization techniques, many reports have indicated that a very small quantity of Zn atoms is reduced on small Cu nanoparticles which results in a subtle change in geometric and electronic structure of Cu due to desirable bimetallic properties15–18.

Table 1. Comparison of Cu loading, Cu dispersion, Cu surface area for the Cu containing CZG and LDH derived catalysts.

Figure 2. TEM (a-d) images of freshly prepared CZG and AMO-LDH samples: (a) CZG5Ga; (b) CZG40Ga; (c) LDH5Ga; (d) LDH30Ga; (e) AFM image of single layer and few layers freshly prepared LDH30Ga sample on Si substrate and (f) the height profile of (e).

Figure 6. TEM images of the calcined (a, e) and reduced (b, c, f, g) samples, and size distribution diagrams (d, h) of the nanoparticles in the reduced samples. Upper rows: (a) calcined CZG5Ga; (b-d) reduced CZG5Ga containing 5–10 nm Cu-rich particles (mean size = 6.3 ± 0.2 nm) with some of much larger sizes. Lower rows: (e) calcined sheet-like LDH30Ga sample; (f-h) reduced LDH30Ga containing many homogeneous small Cu-rich particles of < 5nm (mean size = 4.0 ± 0.1 nm).

Figure 5. Catalytic performance of CZG (a) and AMO-LDH (b) precursor catalysts for CO2 hydrogenation to methanol. Reaction conditions: T = 190–310 oC, P = 4.5 MPa, WHSV = 18,000 mL∙gcat−1∙h−1, and H2:CO2 (molar) = 3:1. For simplicity and clarity, only 250–290 oC temperature range, at which the catalysts exhibited higher activity, is presented. Error bars indicate the standard deviation of the raw data.

Table 2 Comparison of methanol space-time yields of selected catalysts with this work.

Figure 4. Temperature Programmed Reduction (TPR) profile of calcined (a) CZG samples (b) LDH samples.

Citations

Journal Article•10.1007/s10854-022-09546-2

The effect of Ag NPs and C3N5 on the third-order nonlinear optical responses of the nano Zn–Cu–Cr–LDH

Masoumeh Ghalkhani, +2 more

- 01 Jan 2023

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Hydrogenation of CO 2 to Chemicals with Green Hydrogen

Feng Sha, +4 more

- 21 Jan 2022

TL;DR: In this paper , the authors highlight the recent advances in the development of heterogeneous catalysts for the direct hydrogenation of CO 2 to methanol and lower olefins as well as aromatics, with special emphasis on catalyst design, catalytic performance, and relationships between structure and activity.

...read moreread less

Journal Article•10.1038/s41929-024-01236-y

Atom-by-atom design of Cu/ZrOx clusters on MgO for CO2 hydrogenation using liquid-phase atomic layer deposition

Seongmin Jin, +10 more

- 14 Oct 2024

- Nature Catalysis

Journal Article•10.1002/apj.2879

Comparative study on CuO–La 2 O 3 /ZrO 2 catalysts prepared by amino acid complexing‐combustion in CO 2 hydrogenation

Jian Ding, +7 more

- 21 Jan 2023

- Asia-Pacific Journal of Chemical Enginee...

TL;DR: In this article , the structure and catalytic activity of as-obtained catalysts depended on the group type and carbon chain length of amino acids, which was conducive to the formation of a larger specific surface area along with abundant pores and a smaller grain size of CuO.

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Patent

Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof

Song Yufei, +2 more

- 22 Feb 2019

TL;DR: In this paper, a mono-disperse noble metal-loaded single-layer hydrotalcite material is presented, which presents excellent catalytic activity in dehydrogenation coupling reaction.

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References

•Book

Handbook of x-ray photoelectron spectroscopy : a reference book of standard spectra for identification and interpretation of XPS data

John F. Moulder, +2 more

- 01 Jan 1995

3.6K

Journal Article•10.1021/CR200434V

Recent advances in the synthesis and application of layered double hydroxide (LDH) nanosheets.

Qiang Wang, +1 more

- 27 Mar 2012

- Chemical Reviews

TL;DR: Delamination of LDHs is an interesting route for producing positively charged thin platelets with a thickness of a few atomic layers, which can be used as nanocomposites for polymers or as building units for making new designed organic- inorganic or inorganic-inorganic nanomaterials.

...read moreread less

•Journal Article•10.1126/SCIENCE.1219831

The Active Site of Methanol Synthesis over Cu/ZnO/Al2O3 Industrial Catalysts

Malte Behrens, +14 more

- 18 May 2012

- Science

TL;DR: This work shows how to identify the crucial atomic structure motif for the industrial Cu/ZnO/Al2O3 methanol synthesis catalyst by using a combination of experimental evidence from bulk, surface-sensitive, and imaging methods collected on real high-performance catalytic systems in combination with density functional theory calculations.

...read moreread less

2.2K

Journal Article•10.1016/J.CATTOD.2006.02.029

Global challenges and strategies for control, conversion and utilization of CO2 for sustainable development involving energy, catalysis, adsorption and chemical processing

Chunshan Song

- 30 Jun 2006

- Catalysis Today

TL;DR: In this paper, the authors proposed to use CO2 for environmentally-benign physical and chemical processing that adds value to the process, using CO2 as an alternate medium or solvent or co-reactant or a combination of them.

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•Journal Article•10.1126/SCIENCE.AAL3573

Active sites for CO2 hydrogenation to methanol on Cu/ZnO catalysts

Shyam Kattel, +7 more

- 24 Mar 2017

- Science

TL;DR: A direct comparison between the activity of ZnCu and ZnO/Cu model catalysts for methanol synthesis is reported, highlighting a synergy of Cu andZnO at the interface that facilitates methenol synthesis via formate intermediates.

...read moreread less

1.4K

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CO2 Hydrogenation to Methanol over Catalysts Derived from Single Cationic Layer CuZnGa LDH Precursors

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AI Agents for this Paper

Most frequently asked questions

1. What are the contributions mentioned in the paper "Co2 hydrogenation to methanol over catalysts derived from single cationic layer cuznga ldh precursors" ?

2. What is the catalytic activity of Cu?

3. What is the reason for the formation of Cu nanoparticles in the catalytically?

4. What is the role of Zn on the structure of Cu nanoparticles?

5. What is the evidence of the use of Ga to reduce the crystal size of aurichalcite?

6. How much Ga is needed to form ultra-thin AMO-LDH sheets?

7. What is the effect of the cationic layer on Cu particles?

8. What is the formula for a layered double hydroxide phase?

9. What is the reason for the peak shifts observed in the AMO-LDH samples?

10. What is the role of Cu and Zn in the hydrogenation of methanol?

11. What are the important aspects for the catalyst development?

12. What is the morphology of the reduced catalysts?

13. What is the effect of the lower temperature shoulder on Cu particle size in CZG precursors?

14. What is the main difference between the CZG and LDH samples?

Figures

Citations

The effect of Ag NPs and C3N5 on the third-order nonlinear optical responses of the nano Zn–Cu–Cr–LDH

Hydrogenation of CO 2 to Chemicals with Green Hydrogen

Atom-by-atom design of Cu/ZrOx clusters on MgO for CO2 hydrogenation using liquid-phase atomic layer deposition

Comparative study on CuO–La 2 O 3 /ZrO 2 catalysts prepared by amino acid complexing‐combustion in CO 2 hydrogenation

Mono-disperse noble metal-loaded single-layer hydrotalcite material as well as preparation method and application thereof

References

Handbook of x-ray photoelectron spectroscopy : a reference book of standard spectra for identification and interpretation of XPS data

Recent advances in the synthesis and application of layered double hydroxide (LDH) nanosheets.

The Active Site of Methanol Synthesis over Cu/ZnO/Al2O3 Industrial Catalysts

Global challenges and strategies for control, conversion and utilization of CO2 for sustainable development involving energy, catalysis, adsorption and chemical processing

Active sites for CO2 hydrogenation to methanol on Cu/ZnO catalysts

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