Reaction and Surface Characterization Study of Higher AlcoholSynthesis Catalysts

Epling, William S.; Hoflund, Gar B.; Hart, Walter M.; Minahan, David M.

doi:10.1006/jcat.1997.1725

Cited by 45 publications

(25 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the Cu/ZnO catalyst, which is a renowned catalyst for methanol synthesis from syngas [1], gives a higher yield of higher alcohols such as propanol and butanol when the catalyst is doped with the Cs atoms [2,3]. A similar effect is also found for the K-promoted ZnO catalyst, which is found to be efficient for isobutanol synthesis, in sharp contrast to the undoped ZnO catalyst, which does not yield isobutanol [4,5]. A precise role of doped AM's in these catalytic reactions has not been fully understood.…”

Section: Introductionmentioning

confidence: 78%

See 1 more Smart Citation

Alkali-Metals on ZnO(10-10) Studied by Low-Energy Electron Diffraction and Photoelectron Spectroscopy

Ozawa

Satō

Oba

et al. 2005

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

The geometric and electronic properties of alkali metals (Na and Cs) on ZnO(1010) are investigated by means of photoelectron spectroscopy and low energy electron diffraction (LEED). Growth of the Na overlayer on ZnO(1010) at room temperature is characterized by layer-by-layer growth or monolayer growth followed by three-dimensional cluster growth. The Na adatoms in the first layer are in a cationic state, and the metallic phase is formed on top of the first cationic layer. Although Na deposition at room temperature does not yield any long-range ordered superstructure, annealing the Na-covered surface results in a (1×3) LEED pattern, and we propose the formation of the Na atomic chains along the Zn-O dimer rows. For the Cs adsorption system, the disordered overlayer by ionized Cs adatoms is also formed throughout the submonolayer coverage region. Unlike the Na adsorption system, heat treatment of the Cs-covered surface does not yield any ordered structure until all Cs adatoms desorb from the surface.

show abstract

Section: Introductionmentioning

confidence: 78%

“…A precise role of doped AM's in these catalytic reactions has not been fully understood. Thus, it is important to study the adsorption state of AM's and their behavior on the ZnO surface, especially at working temperatures between 500 and 700 K [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Alkali-Metals on ZnO(10-10) Studied by Low-Energy Electron Diffraction and Photoelectron Spectroscopy

Ozawa

Satō

Oba

et al. 2005

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…If other chemical states of Zn are present in the near-surface regions, they must be present in minute amounts relative to ZnO. In all of the previous studies [11,12,15,16], ZnO has been found to be the predominant Zn species in the near-surface region. Since the chemical state of the Zn in the near-surface regions of the two catalysts are identical, this cannot account for the observed differences in catalyst performance.…”

Section: Resultsmentioning

confidence: 94%

“…ISS and XPS data were then collected from the two samples and compared. More complete descriptions of the experimental systems used for the reaction studies and the sample characterization studies are provided in a previous study [11].…”

Section: Methodsmentioning

confidence: 99%

“…The addition of an alkali promoter to ZnO powder was shown to be necessary for the formation of isobutanol from syngas [13]. Previous studies have demonstrated that a maximum in isobutanol production occurs as a function of the alkali promoter concentration [2,[4][5][6][7][8][9][11][12][13][14][15][16] for methanol-synthesis-based catalyst materials. Since a specific promoter loading results in optimum catalytic performance, a specific chemical or electronic interaction may exist between the promoter and catalyst material at certain concentrations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reaction and surface characterization study of Zn/Cr-based higher-alcohol synthesis catalysts X: Effects of excess promoter loading on surface chemistry

Epling

Hoflund

Minahan³

1999

React Kinet Catal Lett

Self Cite

View full text Add to dashboard Cite

Promoter loading level significantly affects the catalytic behavior of Zn/Cr spinel higher alcohol synthesis (HAS) catalysts. In this study a 5.9 wt.% Pd-promoted Zn/Cr spinel with a 5 and 7 wt.% K promoter have been tested and compared. At 1500 psig and 400~ the catalyst containing 5 wt.% K results in the production of slightly more butanol, less methanol and more hydrocarbons. Using ion scattering spectroscopy and X-ray photoelectron spectroscopy, differences are found between the two catalyst surfaces which must be responsible for the differences in catalytic behavior.

show abstract

Ceria‐Zirconia/Zeolite Bifunctional Catalyst for Highly Selective Conversion of Syngas into Aromatics

et al. 2018

View full text Add to dashboard Cite

Ceria‐zirconia solid solutions with tunable surface oxygen vacancy have been used in the direct conversion of syngas into aromatics after coupling with ZSM‐5 zeolite. A high selectivity of 83.1 % to aromatics has been achieved from syngas with low H2/CO ratio over Ce0.2Zr0.8O2/ZSM‐5 bifunctional catalyst. The surface oxygen vacancy of Ce0.2Zr0.8O2 is supposed to facilitate the formation of oxygenates which act as intermediates for C−C coupling and aromatization on ZSM‐5, and thus contribute to the well kinetic matching between C−O activation and C−C coupling over these two components of catalyst. The ceria‐zirconia with abundant surface oxygen vacancies and enhanced lattice oxygen mobility intimately mixed with ZSM‐5 zeolite with moderate acidity and crystal size play an important role in the catalytic performance.

show abstract

Reaction and Surface Characterization Study of Higher AlcoholSynthesis Catalysts

Abstract: Journal of Catalysis 169 (1997) 438-446. doi:10.1006/jcat.1997.17252016-03-04T18:46:15

Cited by 45 publications

References 27 publications

Alkali-Metals on ZnO(10-10) Studied by Low-Energy Electron Diffraction and Photoelectron Spectroscopy

Alkali-Metals on ZnO(10-10) Studied by Low-Energy Electron Diffraction and Photoelectron Spectroscopy

Reaction and surface characterization study of Zn/Cr-based higher-alcohol synthesis catalysts X: Effects of excess promoter loading on surface chemistry

Ceria‐Zirconia/Zeolite Bifunctional Catalyst for Highly Selective Conversion of Syngas into Aromatics

Contact Info

Product

Resources

About