scholarly journals Exploring the Catalytic Activity of Zirconia, Zirconia Supported Metals and Metal Oxides for Oxidation of Phenol

2012 ◽  
Vol 01 (02) ◽  
pp. 23-27
Author(s):  
Mohammad Sadiq ◽  
Mohammad Ilyas
Keyword(s):  
Catalytic Activity ◽  
Metal Oxides ◽  
Oxidation Of Phenol ◽  
Supported Metals

scholarly journals CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 724 ◽  
Author(s):  
Yan Cui ◽  
Leilei Xu ◽  
Mindong Chen ◽  
Chufei Lv ◽  
Xinbo Lian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Co Oxidation ◽  
Active Sites ◽  
Earth Metal ◽  
High Dispersion ◽  
Impregnation Method ◽  
X Ray

CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2 support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2 temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3 showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2 solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.

Catalytic Performance of SO2 by Colloidal Gold Supported on Nano γ-Fe2O3

2010 ◽  
Vol 178 ◽  
pp. 65-70 ◽  
Author(s):  
Sheng Rui Xu ◽  
Qin Shuai ◽  
Jin Hua Cheng ◽  
Xiao Ge Wang
Keyword(s):  
Gas Chromatography ◽  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Metal Oxides ◽  
Water Vapour ◽  
Colloidal Gold ◽  
Supported Catalysts ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Sulfate Species

A new catalyst of gold supported on nanometal oxide for oxidation of SO2 was developed. Deposition-precipitation method was used to prepare gold-based catalysts. The catalytic activity of the catalysts was evaluated by determining the concentration of SO2 with gas chromatography under reaction temperature from 100 to 700°C. The results showed that there was an enhancement of catalytic activity when gold nanoparticles were dispersed on the surface of nano-metal oxides, furthermore, γ-Fe2O3 showed the highest activity as the support of the colloidal gold supported catalysts among the nanometal oxides including γ-Fe2O3, Fe2O3, ZnO, and Al2O3. It was also found that water vapour in the reaction enhanced the catalytic activity of Au/γ-Fe2O3. The Au/γ-Fe2O3 was characterized by XRD and FTIR methods, which indicated that the gold nanoparticles were dispersed on the γ-Fe2O3 support and sulfate species were formed on the surface of catalysts.

Complete phenol removal in liquid-phase under moderate condition over Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 catalysts

2020 ◽  
Vol 13 (07) ◽  
pp. 2050030
Author(s):  
Abdul Rohman Supandi ◽  
Naoyoshi Nunotani ◽  
Nobuhito Imanaka
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Atmospheric Pressure ◽  
Phenol Removal ◽  
Complete Oxidation ◽  
Oxygen Release ◽  
Moderate Condition ◽  
Oxidation Of Phenol ◽  
And Storage

Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 catalysts were synthesized for the complete oxidation of phenol in liquid-phase under moderate condition. The loading of ZrO2 onto SBA-16 effectively enhanced the catalytic activity of Pt/CeO2–ZrO2–SnO2/ZrO2/SBA-16 due to the increase of the oxygen release and storage abilities of the CeO2–ZrO2–SnO2 promoter. Among the prepared catalysts with various ZrO2 loading amounts (0–36[Formula: see text]wt.%), the Pt(7[Formula: see text]wt.%)/Ce[Formula: see text]Zr[Formula: see text]Sn[Formula: see text]O2 (16[Formula: see text]wt.%)/ZrO2(24[Formula: see text]wt.%)/SBA-16 exhibited the highest activity, and the complete phenol removal was achieved after the reaction at 80∘C for 8[Formula: see text]h under the atmospheric pressure.

Enhanced three way catalytic activity of NiFe 2 O 4 by physically mixed metal oxides

2018 ◽  
Vol 303 ◽  
pp. 40-45 ◽  
Author(s):  
Shiori Nagai ◽  
Kakuya Ueda ◽  
Junya Ohyama ◽  
Atsushi Satsuma
Keyword(s):  
Catalytic Activity ◽  
Metal Oxides ◽  
Mixed Metal Oxides ◽  
Mixed Metal

Catalytic activity of Ni‐Co supported metals in carbon dioxides methanation

2020 ◽  
Vol 98 (9) ◽  
pp. 1924-1934
Author(s):  
Patrizia Frontera ◽  
Angela Malara ◽  
Vincenza Modafferi ◽  
Vincenzo Antonucci ◽  
Pierluigi Antonucci ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Supported Metals
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