OXIDATION OF PHENOL IN AQUEOUS SOLUTION WITH COPPER OXIDE CATALYSTS SUPPORTED ON γ-Al2O3, PILLARED CLAY AND TiO2: COMPARISON OF THE PERFORMANCE AND COSTS ASSOCIATED WITH EACH CATALYST

Pires, C. A. M.; Santos, Aurora; Jordão, Elizabete

doi:10.1590/0104-6632.20150324s00002232

Cited by 22 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The patterns exhibit a peak at 2θ = 67 °, indicating a poorly crystalline γ-Al 2 O 3 mixed with the primary amorphous structures. A similar pattern is reported for a material prepared from a copper(II) nitrate aqueous solution to obtain catalysts supported by Al 2 O 3 (Pires et al, 2015). The peaks corresponding to the CuO and ZnO phases cannot be observed probably due to high dispersion or low content in the catalysts.…”

Section: Characterization Of the Catalystssupporting

confidence: 78%

Synthesis of MeOH and DME From CO2 Hydrogenation Over Commercial and Modified Catalysts

et al. 2022

View full text Add to dashboard Cite

Growing concern about climate change has been driving the search for solutions to mitigate greenhouse gas emissions. In this context, carbon capture and utilization (CCU) technologies have been proposed and developed as a way of giving CO2 a sustainable and economically viable destination. An interesting approach is the conversion of CO2 into valuable chemicals, such as methanol (MeOH) and dimethyl ether (DME), by means of catalytic hydrogenation on Cu-, Zn-, and Al-based catalysts. In this work, three catalysts were tested for the synthesis of MeOH and DME from CO2 using a single fixed-bed reactor. The first one was a commercial CuO/γ-Al2O3; the second one was CuO-ZnO/γ-Al2O3, obtained via incipient wetness impregnation of the first catalyst with an aqueous solution of zinc acetate; and the third one was a CZA catalyst obtained by the coprecipitation method. The samples were characterized by XRD, XRF, and N2 adsorption isotherms. The hydrogenation of CO2 was performed at 25 bar, 230°C, with a H2:CO2 ratio of 3 and space velocity of 1,200 ml (g cat · h)−1 in order to assess the potential of these catalysts in the conversion of CO2 to methanol and dimethyl ether. The catalyst activity was correlated to the adsorption isotherms of each reactant. The main results show that the highest CO2 conversion and the best yield of methanol are obtained with the CZACP catalyst, very likely due to its higher adsorption capacity of H2. In addition, although the presence of zinc oxide reduces the textural properties of the porous catalyst, CZAWI showed higher CO2 conversion than commercial catalyst CuO/γ-Al2O3.

show abstract

Section: Characterization Of the Catalystssupporting

confidence: 78%

Synthesis of MeOH and DME From CO2 Hydrogenation Over Commercial and Modified Catalysts

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Replacing noble metals by lower cost transition elements as cobalt (Co), cerium (Ce), copper (Cu), manganese (Mn) and chromium (Cr) is considered a technological advance in the catalysis area [8][9][10]. Copper oxide-based catalysts have been widely studied in the last 35 years due to their high activity and selectivity in processes such as methanol synthesis, water gas shift reaction, selective catalytic reduction of NOx, oxidative methanol steam reforming (SRM) as well as photocatalysis [11][12][13]. Among the materials studied for the catalytic support, γ-Al 2 O 3 [14], silica [15] and TiO 2 [16], are promising materials and are being increasingly used as catalytic supports for the several applications.…”

Section: Introductionmentioning

confidence: 99%

Study of the structural and morphological properties of copper catalysts supported on Al2O3 and TiO2 synthesized by the impregnation method

Queiroz¹,

Barbosa²

2019

Matéria (Rio J.)

View full text Add to dashboard Cite

Aluminum oxide and titanium oxide are widely used as catalytic support. Due to their characteristics and properties, they have several applications such as chemical processes, photocatalysis and pollution control. In this work, the catalytic supports of Al 2 O 3 and TiO 2 were impregnated with 2% of copper oxide by the method of impregnation. The catalysts were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Telle (BET) surface area and Infrared Spectroscopy techniques (FTIR). The results of XRD analysis presented the Cu/TiO 2 catalyst with high degree of crystallinity where the peaks corresponding to the phases anatase, rutile and CuO are easily found, while the Cu/Al 2 O 3 catalyst presented low degree of crystallinity. The samples morphology is in the form of agglomeration, the specific surface area was higher when copper metal was impregnated to the supports and the highest values was obtained with Cu/Al 2 O 3 catalyst. FTIR analysis allowed the visualization of the main vibrations of the functional groups presents in the catalysts samples. According to the results, it was observed that the incorporation of copper oxide did not affect significantly the crystalline structure of TiO 2 and Al 2 O 3 and that at the calcination temperature of 500°C it is possible to obtain a high specific surface area and a more active phase resulting in a good characterization which is suitable for various industrial applications.

show abstract

“…After 120 min of the catalytic reaction, although leaching copper ion was detected up to 0.84 and 1.27 mg/L for the Fe 3 O 4 @Cu and Fe 3 O 4 @SiO 2 @Cu, respectively (Table 2), these values correspond to less than 1% total metals and are quite low when compared to other copper-based heterogeneous catalysts reported in the literature. 25,49,50 The results imply that high catalytic activity of the material can be retained after regeneration.…”

Section: Synthesis Of Hollow Mesoporous Silica Spheres (Hmss)mentioning

confidence: 86%

Nonsacrificial Template Synthesis of Magnetic-Based Yolk–Shell Nanostructures for the Removal of Acetaminophen in Fenton-like Systems

Cuong

Kim

2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Recently, yolk-shell structured materials with active metal cores have received considerable attention in heterogeneous Fenton-like systems, which have excellent catalytic performance. In this study, we initially attempted the nonsacrificial template synthesis of yolk-shell structured nanoparticles with magnetite cores encapsulated in a mesoporous silica shell (FeO@SiO) via a modified sol-gel process and then evaluated their catalytic activity for acetaminophen degradation in Fenton-like systems. Second, copper nanoparticles were decorated on the surface of the FeO@SiO microspheres (FeO@SiO@Cu) to enhance the catalytic activity. The morphological, structural, and physicochemical properties of the prepared materials were characterized via X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, field emission transmission electron microscopy, nitrogen adsorption-desorption isotherms, specific surface area, ζ-potential, magnetic properties, and Fourier transform infrared spectroscopy. The results demonstrated a successful fabrication of the targeted materials. The yolk-shell structured materials possess a spherical morphology with an active core, protective shell, and hollow void. The FeO@SiO and FeO@SiO@Cu variants showed acetaminophen removal rates significantly higher compared to those of their counterparts, i.e., the FeO and FeO@Cu core-shell structures. FeO@SiO@Cu showed that the copper nanoparticles were firmly immobilized on the mesoporous silica shell, dramatically improving the catalytic performance. Both the yolk-shell structured FeO@SiO and FeO@SiO@Cu exhibited good separation and satisfactory regeneration properties, which could be recycled six times without any obvious decline in catalytic activity. Overall, the results of this study suggested that FeO@SiO and FeO@SiO@Cu yolk-shell nanostructures could be promising catalysts for a heterogeneous Fenton-like system by which the removal of emerging contaminants can be greatly improved.

show abstract

OXIDATION OF PHENOL IN AQUEOUS SOLUTION WITH COPPER OXIDE CATALYSTS SUPPORTED ON γ-Al2O3, PILLARED CLAY AND TiO2: COMPARISON OF THE PERFORMANCE AND COSTS ASSOCIATED WITH EACH CATALYST

Cited by 22 publications

References 38 publications

Synthesis of MeOH and DME From CO2 Hydrogenation Over Commercial and Modified Catalysts

Synthesis of MeOH and DME From CO2 Hydrogenation Over Commercial and Modified Catalysts

Study of the structural and morphological properties of copper catalysts supported on Al2O3 and TiO2 synthesized by the impregnation method

Nonsacrificial Template Synthesis of Magnetic-Based Yolk–Shell Nanostructures for the Removal of Acetaminophen in Fenton-like Systems

Contact Info

Product

Resources

About