FTIR spectroscopy of NH3 and NO adsorption on copper-on-alumina catalysts

Stoilova, D.; Cheshkova, Katinka T.; Nickolov, R.

doi:10.1007/bf02475521

Cited by 5 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present paper continues our studies on the preparation and characterization of alumina-supported metal oxide catalysts from acetate and formate precursors [11][12][13][14]. Kapteijn et al [15,16] explained the higher activity of the alumina-supported manganese oxide catalysts prepared from acetate precursors with respect to the selective catalytic reduction of NO with NH 3 as compared to those parepared from nitrate precursors in terms of the higher dispersion of the supported oxide phase and its homogeneous distribution throughout the alumina particles.…”

Section: Introductionsupporting

confidence: 65%

Infrared Spectroscopic Study of NO and NH3 Adsorption on Alumina-Supported Nickel Oxide Catalysts

Stoilova¹,

Koleva²,

Cheshkova³

2002

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

The surface changes of alumina due to supported nickel oxide species (samples are prepared by step-wise pore volume impregnation with formate solutions) are studied in the high frequency region (OH stretches) by the method of in situ FTIR spectroscopy. A hypothesis is made that the nickel species deposite predominatingly on the surface neutral OH groups via hydrogen bonds. The deposition of the nickel oxide species on the coordinatively unsaturated Al 3+ ions (obtained as result of the dehydroxylation) is also discussed. The metal concentration increase does not lead to the change in the alumina surface, while the calcination temperature appears to change it. The adsorption and desorption of ammonia species on the nickel-supported samples reveal that the nickel concentration increase results in the increase of the number of the nickel species and in the intensity increase of the bands corresponding to ammonia more weakly bonded to the nickel species. The analysis of the spectra reveals that the sample containing 1.7% NiO and heated at 870 K displays the highest activity with respect to NO oxydation as compared to other samples studied.

show abstract

Section: Introductionsupporting

confidence: 65%

Infrared Spectroscopic Study of NO and NH3 Adsorption on Alumina-Supported Nickel Oxide Catalysts

Stoilova¹,

Koleva²,

Cheshkova³

2002

Zeitschrift Für Physikalische Chemie

View full text Add to dashboard Cite

show abstract

“…The present paper reports our continued studies on the preparation of alumina-supported metal oxide catalysts by pore volume impregnation of γ -Al 2 O 3 with metal(II) formate solutions (simple and mixed) (6,10,11). The impregnation of carriers with mixed metal salt solutions aims at increasing the catalyst activity due to the promoting effect of the dopant or at the preparation of oxide phases with a definite structure and stoichiometry.…”

Section: Introductionmentioning

confidence: 97%

Surface and Texture Characterization of Alumina-Supported Copper and Mixed Copper–Manganese Oxide Catalysts and Their Formate Precursors

Stoilova

Nickolov

Cheshkova

2000

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…The lattice parameter was calculated using the equation a 0 = 2d 100 √ 3 [54][55][56]. Rietveld refinement was carried out on the XRD pattern of γ-Al 2 O 3 using the software MAUD [57]. LaB 6 from NIST was used as a standard reference for determining the instrumental parameters.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Mesostructured γ-Al2O3-Based Bifunctional Catalysts for Direct Synthesis of Dimethyl Ether from CO2

et al. 2023

View full text Add to dashboard Cite

In this work, we propose two bifunctional nanocomposite catalysts based on acidic mesostructured γ-Al2O3 and a Cu/ZnO/ZrO2 redox phase. γ-Al2O3 was synthesized by an Evaporation-Induced Self-Assembly (EISA) method using two different templating agents (block copolymers Pluronic P123 and F127) and subsequently functionalized with the redox phase using an impregnation method modified with a self-combustion reaction. These nanocomposite catalysts and their corresponding mesostructured supports were characterized in terms of structural, textural, and morphological features as well as their acidic properties. The bifunctional catalysts were tested for the CO2-to-DME process, and their performances were compared with a physical mixture consisting of the most promising support as a dehydration catalyst together with the most common Cu-based commercial redox catalyst (CZA). The results highlight that the most appropriate Pluronic for the synthesis of γ-Al2O3 is P123; the use of this templating agent allows us to obtain a mesostructure with a smaller pore size and a higher number of acid sites. Furthermore, the corresponding composite catalyst shows a better dispersion of the redox phase and, consequently, a higher CO2 conversion. However, the incorporation of the redox phase into the porous structure of the acidic support (chemical mixing), favoring an intimate contact between the two phases, has detrimental effects on the dehydration performances due to the coverage of the acid sites with the redox nanophase. On the other hand, the strategy involving the physical mixing of the two phases, distinctly preserving the two catalytic functions, assures better performances.

show abstract

FTIR spectroscopy of NH3 and NO adsorption on copper-on-alumina catalysts

Cited by 5 publications

References 13 publications

Infrared Spectroscopic Study of NO and NH3 Adsorption on Alumina-Supported Nickel Oxide Catalysts

Infrared Spectroscopic Study of NO and NH3 Adsorption on Alumina-Supported Nickel Oxide Catalysts

Surface and Texture Characterization of Alumina-Supported Copper and Mixed Copper–Manganese Oxide Catalysts and Their Formate Precursors

Mesostructured γ-Al2O3-Based Bifunctional Catalysts for Direct Synthesis of Dimethyl Ether from CO2

Contact Info

Product

Resources

About