Preparation and Characterization of Cu-Mn-Ce@γ-Al2O3 to Catalyze Ozonation in Coal Chemical Wastewater-Biotreated Effluent

Cu-Mn-Ce@γ-Al2O3 was prepared by incipient wetness impregnation and used to catalyze ozonation in a coal chemical wastewater-biotreated effluent. The preparation factors that considerably affected the catalytic performance of Cu-Mn-Ce@γ-Al2O3, specifically metal oxide loading percentage, calcination temperature, and calcination time, were examined. The catalyst was characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and Brunauer-Emmett-Teller analysis. The optimal catalytic ozonation operating parameters, such as ozone dosage, catalyst dosage, pH, and reaction time, were also investigated. Results showed that an optimized catalyst consisted of 17.0% CuO, 3.0% MnO2, and 2.0% CeO2 (wt.%). The optimal calcination temperature and calcination time were 600 °C and 5 h. The optimal catalytic ozonation operating parameters, including ozone dosage, catalyst dosage, pH, and reaction time, were 7, 80.0 mg/L, 20.0 mg/L, 7 and 50 min, respectively. The COD removal of biotreated effluent increased to 61% under these optimal operating conditions. Meanwhile, ozonation alone resulted in only 20% removal. This work proposes the use of easily available Cu-Mn-Ce@γ-Al2O3 catalyst and might drive the advancement of catalytic ozonation for chemical wastewater purification.

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Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/Ce@RM Catalyst

Water ◽

10.3390/w14020206 ◽

2022 ◽

Vol 14 (2) ◽

pp. 206

Author(s):

Yicheng Wang ◽

Yingkun Wang ◽

Xi Lu ◽

Wenquan Sun ◽

Yanhua Xu ◽

...

Keyword(s):

Reaction Time ◽

Removal Rate ◽

Catalytic Ozonation ◽

Operating Conditions ◽

Cod Removal ◽

X Ray ◽

Initial Ph ◽

Catalyst Dosage ◽

Cod Removal Rate ◽

Tail Water

An Mn/Ce@red mud (RM) catalyst was prepared from RM via a doping–calcination method. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used to characterize the surface morphology, crystal morphology, and elemental composition of the Mn/Ce@RM catalyst, respectively. In addition, preparation and catalytic ozonation conditions were optimized, and the mechanism of catalytic ozonation was discussed. Lastly, a fuzzy analytic hierarchy process (FAHP) was adopted to evaluate the degradation of coal chemical biochemical tail water. The best preparation conditions for the Mn/Ce@RM catalyst were found to be as follows: (1) active component loading of 3%, (2) Mn/Ce doping ratio of 2:1, (3) calcination temperature of 550 °C, (4) calcination time of 240 min, and (5) fly ash floating bead doping of 10%. The chemical oxygen demand (COD) removal rate was 76.58% under this preparation condition. The characterization results suggested that the pore structure of the optimized Mn/Ce@RM catalyst was significantly improved. Mn and Ce were successfully loaded on the catalyst in the form of MnO2 and CeO2. The best operating conditions in the study were as follows: (1) reaction time of 80 min, (2) initial pH of 9, (3) ozone dosage of 2.0 g/h, (4) catalyst dosage of 62.5 g/L, and (5) COD removal rate of 84.96%. Mechanism analysis results showed that hydroxyl radicals (•OH) played a leading role in degrading organics in the biochemical tail water, and adsorption of RM and direct oxidation of ozone played a secondary role. FAHP was established on the basis of environmental impact, economic benefit, and energy consumption. Comprehensive evaluation by FAHP demonstrated that D3 (with an ozone dosage of 2.0 g/H, a catalyst dosage of 62.5 g/L, initial pH of 9, reaction time of 80 min, and a COD removal rate of 84.96%) was the best operating condition.

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CONTROLLED SYNTHESIS OF THE ZnWO4 NANOSTRUCTURE AND STUDY OF THEIR STRUCTURAL AND OPTICAL PROPERTIES

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863512500026 ◽

2012 ◽

Vol 21 (01) ◽

pp. 1250002 ◽

Cited By ~ 2

Author(s):

NGUYEN MANH HUNG ◽

LAM THI HANG ◽

NGUYEN VAN KHANH ◽

DU THI XUAN THAO ◽

NGUYEN VAN MINH

Keyword(s):

Electron Microscopy ◽

Grain Size ◽

Optical Properties ◽

Reaction Time ◽

X Ray Diffraction ◽

Structural And Optical Properties ◽

Calcination Time ◽

Transmission Electron ◽

Pure Phase ◽

Size And Morphology

We investigate the effects of calcination time and concentration of solution on the structure, as well as optical properties in ZnWO4 nanopowder prepared by hydrothermal method. The prepared powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman scattering, optical absorption and photoluminescent spectroscopy (PL). It is shown that the grain size and morphology of ZnWO4 nanopowder can be controlled by adjusting the reaction time as well as the concentration of the solution. The resultant sample is a pure phase of ZnWO4 without any impurities. The result showed that the optical property of ZnWO4 nanopowders depend on their grain size. The optical band gap becomes narrower as the reaction time or concentration of solution is increased. The improved PL properties of the ZnWO4 crystallites can be obtained with the optimal concentration of the solution.

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The Effects of Different Preparation Conditions of IR Catalyst on the Simultaneous Removal of Soot and NOx in the Presence of Rich Oxygen and H2O as Well as SO2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.428.61 ◽

2012 ◽

Vol 428 ◽

pp. 61-64 ◽

Cited By ~ 1

Author(s):

Ting Kun Gu ◽

Rong Shu Zhu ◽

Feng Ouyang

Keyword(s):

Catalytic Activity ◽

Calcination Temperature ◽

Supported Catalysts ◽

Catalytic Performance ◽

Simultaneous Removal ◽

Impregnation Method ◽

Support Material ◽

Calcination Time ◽

Preparation Conditions ◽

Calcination Atmosphere

A series of Ir-supported catalysts were prepared by incipient impregnation method. The activity of Ir catalyst for the simultaneous removal of soot and NOx in the presence of rich-oxygen and H2O as well as SO2 has been studied, and the effects of calcination temperature, calcination time, calcination atmosphere, loading, carrier and precursor on its catalytic performance has also been investigated. Ir catalyst exhibits a high activity. With the calcination temperature increasing, Ir catalytic activity increases firstly and then decreases, and the optimal calcination temperature is 900°C. With the calcination time prolonged, Ir catalytic activity also increases firstly and then decreases, and the optimal calcination time is 3h. The optimal calcination atmosphere is 1.5vol.% H2/N2. Support material and precursor have a little effect on the catalytic activity, and the order is Ir/TiO2 > Ir/ZrO2 > Ir/SiO2 > Ir/Al2O3 > Ir/ZSM-5 and IrCl (CO)[P(C6H5)3]2/ZrO2 > H2IrCl6·6H2O/ZrO2 > IrCl4·4H2O/ZrO2.

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Catalytic Cracking of Cornus wisoniana Oil to Liquid Bio-Fuel Oil Using KF/CaO as a Solid Base Catalyst

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.477-478.1446 ◽

2013 ◽

Vol 477-478 ◽

pp. 1446-1451 ◽

Cited By ~ 1

Author(s):

Zhi Hong Xiao ◽

Wei Wei Jiang ◽

Lin Lin ◽

Saritporn Vittayapadung ◽

Ai Hua Zhang ◽

...

Keyword(s):

Reaction Time ◽

Calcination Temperature ◽

Catalytic Cracking ◽

Layer Structure ◽

Fuel Oil ◽

Solid Base ◽

Base Catalyst ◽

Calcination Time ◽

Solid Base Catalyst ◽

Impregnation Ratio

In this study, catalytic cracking ofCornus wisonianaoil to liquid bio-fuel oil using KF/CaO as a solid base catalyst was studied. The catalyst characteristic by SEM, XRD, CO2-TPD was proposed and the separate effects of impregnation ratio, calcination temperature and calcination time were investigated. This paper also studied the separate influence of mass of catalyst and reaction time on catalytic cracking ofCornus wisonianaoil. The experimental results showed that a 41.7% impregnation ratio, 630°C calcination temperature, and 4h reaction time can obtain option catalyst. When addition of 0.1% KF/CaO catalyst and 35min reaction time gave the best results, and the liquid oil yield exceeded 82.7%. The catalyst basicity was not too high, formed flake porous layer structure.* Corresponding authors:Changzhu Li ([email protected])

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Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution

Journal of Nanomaterials ◽

10.1155/2020/4593054 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Manh B. Nguyen ◽

Giang H. Le ◽

Trang T. T. Pham ◽

Giang T. T. Pham ◽

Trang T. T. Quan ◽

...

Keyword(s):

Catalytic Performance ◽

Catalytic Ozonation ◽

Precipitation Method ◽

X Ray Diffraction ◽

Kcal Mole ◽

Efficient Catalyst ◽

X Ray ◽

Sem Image ◽

Temperature Programmed ◽

Adsorption Desorption

Catalytic ozonation is a new method used for removal of NH4OH solution. Therefore, high catalytic performance (activity and selectivity) should be achieved. In this work, we report the synthesis and catalytic performance of Fe2O3-Co3O4 modified dolomite in the catalytic ozonation of NH4OH solution. Dolomite was successfully activated and modified with Fe2O3 and Co3O4. Firstly, dolomite was activated by heating at 800°C for 3 h and followed by KOH treatment. Activated dolomite was modified with Fe2O3 by the atomic implantation method using FeCl3 as Fe source. Fe2O3 modified dolomite was further modified with Co3O4 by precipitation method. The obtained catalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), N2 adsorption–desorption (BET), and temperature-programmed reduction (H2-TPR). From SEM image, it was revealed that nano-Fe2O3 and Co3O4 particles with the size of 80–120 nm. Catalytic performance of activated dolomite, Fe2O3 modified dolomite, and Fe2O3-Co3O4 modified dolomite in catalytic ozonation of NH4+ solution was investigated and evaluated. Among 3 tested catalysts, Fe2O3-Co3O4 modified dolomite has the highest NH4+ conversion (96%) and N2 selectivity (77.82%). Selectivity toward N2 over the catalyst was explained on the basis of bond strength M-O in oxides through the standard enthalpy ΔH°f of oxide. Catalyst with lower ΔH°f value has higher N2 selectivity and the order is the following: Co3O4 (ΔH°f of 60 kcal (mole O)) > Fe2O3 (ΔH°f of 70 kcal (mole O)) > MgO (ΔH°f of 170 kcal (mole O)). Moreover, high reduction ability of Fe2O3-Co3O4 modified dolomite could improve the N2 selectivity by the reduction of NO3- to N2 gas.

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ADSORPTION OF CATIONIC DYE FROM AQUEOUS SOLUTION USING COMPOSITE CHICKEN EGGSHELL - ANTHILL CLAY: OPTIMIZATION OF ADSORBENT PREPARATION CONDITIONS

Acta Polytechnica ◽

10.14311/ap.2019.59.0192 ◽

2019 ◽

Vol 59 (2) ◽

pp. 192-202 ◽

Cited By ~ 1

Author(s):

Adeyinka Sikiru Yusuff

Keyword(s):

Aqueous Solution ◽

Calcination Temperature ◽

Quadratic Model ◽

Incipient Wetness Impregnation ◽

Impregnation Method ◽

Cationic Dye ◽

Mixing Ratio ◽

Calcination Time ◽

Adsorption Sites ◽

Preparation Conditions

A composite adsorbent was prepared from anthill and eggshell mixture, using an incipient wetness impregnation method and it was used for an adsorption of cationic dye (methylene blue, MB) from an aqueous solution. The effects of three preparation parameters including calcination temperature, calcination time and mixing ratio of eggshell to anthill on the MB uptake were investigated using the central composite design (CCD) of response surface methodology (RSM). A quadratic model was developed to predict the response with a high accuracy. The optimal adsorbent sample was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and X-ray fluorescence (XRF) spectroscopy. The obtained results revealed that the calcination temperature significantly affected the MB adsorption. The optimum MB uptake of 23.87 mg/g was achieved under the optimum conditions including a calcination temperature of 823.45 °C, calcination time of 3.54 h and eggshell/anthill mixing ratio of 1.89:1. A detailed characterization of an optimal adsorbent sample confirmed the presence of pores, active functional groups and various molecular adsorption sites on its surface. Equilibrium adsorption isotherms and kinetics were also studied and it was revealed that the isotherms and kinetics data fitted well to the Freundlich model and pseudo-second-order kinetics model, respectively.

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Preparation, Characterization and Catalytic Application for the Synthesis of Tetrahydrofuran

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.2322 ◽

2013 ◽

Vol 838-841 ◽

pp. 2322-2325

Author(s):

Yan Hong Lei ◽

Xiao Hua Cao

Keyword(s):

Reaction Time ◽

Reaction Temperature ◽

Catalytic Performance ◽

Optimal Conditions ◽

Catalytic Application ◽

Catalyst Dosage ◽

Excellent Catalytic Performance

1,4-butanediol condensation can be performed with Cs-W - HPA. Cs2H4P2W18O62showed excellent catalytic performance for preparation of THF. In the optimal conditions, the reaction temperature was 180 °C, the reaction time was 43 min, catalyst dosage was 0.4 g, THF yield could reach 89.4%. And reused five times, the yield could reach 83.2%. HPA had the very good application prospect.

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The Effect of Calcination Temperature on Cobalt Oxide Species and Performance for Catalytic Ozonation of NH4+ in Water

JKPK (Jurnal Kimia dan Pendidikan Kimia) ◽

10.20961/jkpk.v4i3.26702 ◽

2019 ◽

Vol 4 (3) ◽

pp. 225

Author(s):

Lina Mahardiani

Keyword(s):

High Temperature ◽

High Activity ◽

Cobalt Oxide ◽

Calcination Temperature ◽

High Selectivity ◽

Catalytic Performance ◽

Catalytic Ozonation ◽

Oxide Catalysts ◽

Gas Products ◽

And Performance

Cobalt oxide catalysts can be prepared by impregnation and calcined under different temperature to obtained different species of cobalt oxide, namely CoO(OH), Co3O4, and CoO. Co3O4 was the most appropriate catalyst for decomposing NH4+ with O3 in the presence of Cl– because of relatively high activity, 74%, and high selectivity for gas products, 88%, compared to CoO and CoO(OH). Cl– is necessary to proceed the catalytic ozonation of NH4+ since Cl– participate in the catalytic ozonation mechanism, while SO42– inhibited the process. During the catalytic ozonation of NH4+, Co3O4 showed no deactivation rather than enhanced the catalytic performance after repeated used up to 100% of NH4+ conversion. The Co3O4 can be regenerated by recalcining the catalyst under air at high temperature.

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Synthesis of a New Copper-Based Supramolecular Catalyst and Its Catalytic Performance for Biodiesel Production

International Journal of Chemical Engineering ◽

10.1155/2018/7452817 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7

Author(s):

Fei Chang ◽

Chen Yan ◽

Quan Zhou

Keyword(s):

Reaction Time ◽

High Activity ◽

Reaction Temperature ◽

Mesoporous Structure ◽

Catalytic Performance ◽

Biodiesel Production ◽

Xanthium Sibiricum ◽

Catalyst Dosage

A new copper-based supramolecular (β-cyclodextrins, β-CD) catalyst was synthesized and used for transesterification of Xanthium sibiricum Patr oil to biodiesel. This catalyst exhibited high activity (88.63% FAME yield) in transesterification under the ratio of methanol-oil: 40 : 1; catalyst dosage: 8 wt.%; reaction temperature: 120°C; and reaction time: 9 h. The XRD, SEM, TEM, XPS, and BET characterization results showed that Cu-β-CD catalyst was amorphous and had clear mesoporous structure (17.2 nm) as compared with the native β-CD. This phenomenon is attributed to the coordination of Cu and β-CD.

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Effects of operating parameters for dry reforming of methane: A short review

E3S Web of Conferences ◽

10.1051/e3sconf/202128704015 ◽

2021 ◽

Vol 287 ◽

pp. 04015

Author(s):

Muhammad Ayoub ◽

Chi Cheng Chong ◽

Asif Zamir ◽

Yoke Wang Cheng ◽

Sarah Farrukh ◽

...

Keyword(s):

Space Velocity ◽

Short Review ◽

Catalytic Performance ◽

Dry Reforming ◽

Operating Conditions ◽

Carbon Accumulation ◽

Dry Reforming Of Methane ◽

Operating Parameters ◽

Co2 Reforming ◽

Weight Hourly Space Velocity

Dry reforming of methane (DRM) which also known as CO2 reforming of methane is a well-investigated reaction to serve as an alternative technique to attenuate the abundance of greenhouse gases (CO2 and CH4). The syngas yielded is the main component for the liquid fuels and chemicals production in parallel with the fluctuating price of oil. Major researches were executed to seek for the well-suited catalysts before the commercialization of DRM can be realized. However, severe deactivation due to the carbon formation restricted the usage of promising Ni-based catalysts for DRM. Meanwhile, the deactivation on these catalysts can be associated with the operating conditions of DRM, which subsequently promoted the secondary reactions at different operating conditions. In fact, the parametric study could provide a benchmark for better understanding of the fundamental steps embodied in the CH4 and CO2 activation as well as their conversions. This review explores on the influences of the reaction operating parameters in term of the reaction temperatures, reactant partial pressures, feed ratios, and weight hourly space velocity (WHSV) on catalytic performance and carbon accumulation for the DRM.

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