Pt Nanoparticles Supported on N/Ce-Doped Activated Carbon for the Catalytic Oxidation of Formaldehyde at Room Temperature

2020 ◽  
Vol 3 (3) ◽  
pp. 2614-2624 ◽  
Author(s):  
Wenjing Bao ◽  
Hongxia Chen ◽  
Hao Wang ◽  
Runduo Zhang ◽  
Ying Wei ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Room Temperature ◽  
Pt Nanoparticles

scholarly journals Acid-Alkali-Treated Natural Mordenite-Supported Platinum Nanoparticles (Pt/MORn-H-OH) for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Xiaoya Gao ◽  
Qian Guo ◽  
Yuan Zhou ◽  
Dedong He ◽  
Yongming Luo
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Crystalline Phase ◽  
Room Temperature ◽  
Alkali Treatment ◽  
Pt Nanoparticles ◽  
Pt Catalysts ◽  
Step Method ◽  
Oxidation Activity ◽  
Supported Platinum

In this work, a series of natural mordenite-supported platinum (Pt) catalysts were prepared by a facile two-step method, namely, treatment of natural mordenite and then the loading of Pt nanoparticles. The acid-alkali-treated natural mordenite-supported Pt samples (1% Pt/MORn-H-OH) exhibited the highly enhanced catalytic oxidation activity of formaldehyde (HCHO) at room temperature. XRD results showed that the crystalline phase of the mordenite did not change significantly in 1% Pt/MORn-H-OH catalyst. However, the acid-alkali treatment endowed the Pt particles excellent dispersion with the smallest diameter of 2.8 nm in a high loading content, which contributed to the optimal catalytic activity of 1% Pt/MORn-H-OH.

Oxygen vacancy–engineered δ-MnO /activated carbon for room-temperature catalytic oxidation of formaldehyde

2020 ◽  
Vol 278 ◽  
pp. 119294 ◽  
Author(s):  
Yu Huang ◽  
Yan Liu ◽  
Wei Wang ◽  
Meijuan Chen ◽  
Haiwei Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Oxygen Vacancy ◽  
Catalytic Oxidation ◽  
Room Temperature

Enhancement of NO catalytic oxidation on activated carbon at room temperature by nitric acid hydrothermal treatment

2019 ◽  
Vol 471 ◽  
pp. 633-644 ◽  
Author(s):  
Fu-Tian You ◽  
Guang-Wei Yu ◽  
Zhen-Jiao Xing ◽  
Jie Li ◽  
Sheng-Yu Xie ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Catalytic Oxidation ◽  
Hydrothermal Treatment ◽  
Room Temperature

Bifunctional ZnO-MgO/activated carbon adsorbents boost H2S room temperature adsorption and catalytic oxidation

2020 ◽  
Vol 266 ◽  
pp. 118674 ◽  
Author(s):  
Chao Yang ◽  
Yeshuang Wang ◽  
Huiling Fan ◽  
Giacomo de Falco ◽  
Song Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Room Temperature ◽  
Carbon Adsorbents

scholarly journals New Process of Catalytic Oxidation of Organic Pollutants from Water in Soft Conditions in Presence of Sulfonated Cobalt Phthalocyanines Supported on Activated Carbon

2017 ◽  
Author(s):  
Faten El Goul ◽  
Seffen Mongi
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Catalytic Oxidation ◽  
Room Temperature ◽  
Oxidation Catalysis ◽  
Acid Oxidation ◽  
Fenton Reagent ◽  
Temperature And Pressure

In the field of water treatment, catalytic oxidation has been developed around the Fenton reagent (hydrogen peroxide coupled with ferrous iron salt) but this oxidative system has drawbacks. In effect, this system only works in acidic pH. In addition, the Fenton reagent used at room temperature generally offers a partial oxidation of pollutants and is not accompanied by a significant removal of total organic carbon. The WPO process (Wet Peroxide Oxidation) that uses the catalytic activation of peroxide hydrogen at high temperature accelerates the kinetic of degradation reactions. But this method poses problems of cost due to the use of high temperatures reaching 140°C. In clean water, the oxygen is found mainly in the processes WAO (Wet Air Oxidation) which generates a huge investment because of high temperature and pressure (250 to 320 ° C - 50 to 150 bar). This represents a major drawback in the industry. The catalytic oxidation reactions in the presence of métallophthalocyanines described in the literature involve KHSO5 or H2O2 which presents a disadvantage in a field of water depollution. Indeed, for the oxidation of trichlorophenol, adding an organic co-solvent is necessary: The reactions present the inconvenient to be conducted in a mixture acetonitrile / buffer (1 / 3, V / V) and not in an aqueous medium .Therefore, it appears that finding a method for oxidation catalysis involving transition metals and using oxygen under mild conditions of temperature and pressure is a particularly important challenge. During this work, we showed that the synthesis of a catalyst: phthaolocyanine cobalt sulfonated fixed on activated carbon is a simple process that takes place at room temperature. The action of these catalysts has been studied in the oxidation of hexanoic acid by oxygen in normal conditions (20 ° C, 1 atm.). We studied the reaction using two catalysts supported on activated carbon as grains, containingrespectively 12 and 50 μmol / g cobalt. We showed that:• the acid mineralization increases with the degree of grafting. In all cases, 97% of hexanoic acidis removed after 6h.• the behavior of catalysts has been studied through recycling. The catalyst with the lowest contentin cobalt showed an increase of activity during the first four cycles. Such activity is stabilised withapparent values of the fall of total organic carbon (TOC) and chemical demand of oxygen (COD) ofabout 90 %. The increase of cobalt concentration enhances the rate of mineralization (expressed inrelation to TOC eliminate d) from 45 % in the first cycle to 62 % at the third cycle. The loss of cobalt is very low. It is below 0,57 % after six cycles. We have also tested the catalytic action of this system in the succinic acid oxidation, oxalic acid and trichlorophenol. We obtain a quasi total fall of TOC and COD and an important rate of mineralization.All these consistent results, can validate this catalytic system. Especially since the catalyst is inexpensive.

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

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