scholarly journals Synthesis, characterization and catalytic activity of partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) nano catalysts for potential soot oxidation in diesel particulate filters in diesel engines

2020 ◽  
Vol 11 (1) ◽  
pp. 52-57
Author(s):  
Kayode Akinlolu ◽  
Bamgboye Omolara ◽  
Tripathi Shailendra ◽  
Akinsiku Abimbola ◽  
Ogunniran Kehinde
Keyword(s):  
Surface Area ◽  
Inductively Coupled Plasma ◽  
Research Study ◽  
Sol Gel ◽  
Soot Oxidation ◽  
Atomic Emission ◽  
Catalytic Performance ◽  
Inductively Coupled ◽  
Perovskite Catalysts ◽  
Nano Catalysts

AbstractThe sol gel method was used in preparing a series of A site partially substituted La1−xBaxCoO3 (x ≥ 0.1 ≤ 0.4) perovskite catalysts coded LBC1, 2, 3, and 4 and their potential as catalysts for soot oxidation were evaluated. The Brunauer–Emmett–Teller (BET), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Thermogravimetric/Differential Thermal Analysis (TGA/DTG), X-ray analysis (XRD) were used in characterizing the prepared perovskite catalyst. The result shows that at (x≥ 0.2 ≤ 0.4), there was an increase in surface area when we compare it with that of x = 0. The increase in surface area helps in increasing the catalytic performance of the catalyst. Also, when evaluating the catalytic performance of the synthesized catalysts, it was observed that doping the perovskite catalysts helped in the general improvement of the catalytic performance for soot oxidation. The best performance in this research study with a T50 of 484 °C was observed at x = 0.2 catalyst (LBC2). This shows that the non-noble perovskite catalysts prepared in this research study has the potential to replace the noble metal based catalysts used presently in the diesel automotive industry.

scholarly journals Synthesis and Characterization of A-Site Doped Lamno3 Nano Catalysts and its Application for Soot Oxidation

2019 ◽  
Vol 35 (3) ◽  
pp. 927-937
Author(s):  
Kayode Akinlolu ◽  
Abimbola Adebisi ◽  
Bamgboye Omolara ◽  
Ogunniran Kehinde
Keyword(s):  
Citric Acid ◽  
Surface Area ◽  
Preparation Method ◽  
Sol Gel ◽  
Soot Oxidation ◽  
Catalytic Performance ◽  
Synthesis And Characterization ◽  
Nano Catalysts ◽  
A Site

A series of barium doped LaMnO3 perovskite nano catalysts were synthesized using the citric acid sol gel method. The prepared nano catalysts were characterized using the various characterization techniques such as XRD, ICPAES, FTIR, SEM, HRTEM, TPR and BET. The Xrd results showed the purity of the prepared catalyst as no segregated phases were observed and also confirming the crystallinity of the prepared catalyst. The surface area achieved in this experiment presented one of the highest reported in literature. The doping of the perovskite catalysts helps in increasing the surface area. The ICPAES results shows the efficiency of the preparation method adopted. The catalytic evaluation shows that upon introduction of Ba into the perovskite structure, the catalytic performance of the catalyst were greatly increased with LBM3 giving the lowest T50 at 550°C

Antibacterial Effects of Sol-Gel Derived Zinc-Containing Hydroxyapatite

2007 ◽  
Vol 361-363 ◽  
pp. 139-142 ◽  
Author(s):  
Xin Chang Shi ◽  
H.Z. Jiang ◽  
J. Xue ◽  
Yun Mao Liao ◽  
L.Y. Xiao ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Sol Gel ◽  
Brain Heart Infusion ◽  
Zinc Content ◽  
Atomic Emission ◽  
Biological Properties ◽  
Zinc Ions ◽  
Antibacterial Effects ◽  
Inductively Coupled

In order to modify the biological properties of pure hydroxyapatite (HAp), two kinds of zinc-containing HAp, which had zinc content of 5.10wt% and 2.54wt%, respectively, were synthesized via sol-gel technique. The obtained coatings were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Then the antibacterial effects were evaluated through bacteriostatic test on Streptococcus mutans (S.mutans) in vitro and zinc ions releasing ability was investigated through detecting the zinc ions concentration by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The obtained coatings were observed to possess typical apatite peaks in XRD patterns and high homogeneous and porous surfaces in SEM morphology. The coating layer demonstrated good releasing ability in Brain Heart Infusion (BHI) liquid and obviously inhibitory effects to the growth and proliferation of S. mutans. Based on the results obtained above, it is concluded that the sol-gel derived zinc-containing hydroxyapatite could be applied as an antibacterial effective biomaterial.

scholarly journals Y-Modified MCM-22 Supported PdOx Nanocrystal Catalysts for Catalytic Oxidation of Toluene

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 902 ◽  
Author(s):  
Zhu Chen ◽  
Danna Situ ◽  
Jie Zheng ◽  
Zhen Cheng ◽  
Zhuo Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Catalytic Oxidation ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Catalytic Performance ◽  
High Dispersion ◽  
X Ray ◽  
Practical Applications ◽  
Inductively Coupled ◽  
Chlorine Poisoning

A series of rare earth elements (REEs)-modified and Mobil Composition of Matter (MCM)-22-supported Pd nanocrystal catalysts were synthesized via a high-temperature solution-phase reduction method and tested for toluene complete oxidation. These catalytic materials were systematically characterized by N2 adsorption/desorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectroscopy (EDS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), temperature-programmed surface reaction of toluene (toluene-TPSR) and X-ray photoelectron spectroscopic (XPS) techniques in order to investigate the structure–catalytic property relationship. Moreover, catalysts with an appropriate yttrium content greatly improved the catalytic activity of 0.2%Pd/MCM-22. PdOx (x = 0, 1) nanoparticles, ranging from 3.6 to 6.8 nm, which were well distributed on the surface of MCM-22. Efficient electron transfer from the Pd2+/Pd0 redox cycle facilitated the catalytic oxidation process, and the formation of Pd (or Y) –O–Si bonds improved the high dispersion of the PdOx and Y2O3 particles. Toluene–TPSR experiments suggested that the addition of Y2O3 improved the physical/chemical adsorption of 0.2%Pd/MCM-22, thus increasing the toluene adsorption capacity. Then, 0.2%Pd/7.5%Y/MCM-22 exhibited the highest catalytic performance. In addition, this catalyst maintained 95% conversion with high resistance to water and chlorine poisoning, even after toluene oxidation at 210 °C for 100 h, making it more valuable in practical applications.

Cyclohexane Oxidation Catalyzed by Au/MxOyAl2O3 Using Molecular Oxygen

2011 ◽  
Vol 233-235 ◽  
pp. 254-259 ◽  
Author(s):  
Jing Zhao ◽  
Ming Qiao Zhu ◽  
Jia Jing Chen ◽  
Yang Yang Yang ◽  
Yue Tang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Molecular Oxygen ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Catalytic Performance ◽  
Emission Spectrometry ◽  
Plasma Atomic Emission Spectrometry ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Cyclohexyl Hydroperoxide

Alumina was modified by doping with metal oxide and then used as the support for depositing gold by an impregnation-ammonia washing method to obtain Au/MxOy/Al2O3(M=Co, Zr and Ce) catalysts. These samples were characterized by inductively coupled plasma-atomic emission spectrometry (ICP-AES), transmission electron microscope (TEM) and X-ray diffraction (XRD). The effects of Co3O4content, metal oxide and mixed metal oxides on the catalytic activity for the selective oxidation of cyclohexane to cyclohexanone and cyclohexanol using molecular oxygen as oxidant were studied. The results showed that better catalytic performance was obtained over Au/MxOy/Al2O3catalysts compared with over Au/Al2O3catalysts. 9.69% conversion of cyclohexane and 93.31% selectivity to cyclohexanone, cyclohexanol and cyclohexyl hydroperoxide, with 1.02 ratio of cyclohexanone to cyclohexanol were obtained over the Au/MxOy/Al2O3catalyst at 150 , 1.5 MPa for 3 h. Moreover, according to the recycling test, the catalyst could be reused four times without remarkable loss of activity.

Rapid Catalyst Capture Enables Metal-Free Parahydrogen-Based Hyperpolarized Contrast Agents

2018 ◽  
Author(s):  
Danila Barskiy ◽  
Lucia Ke ◽  
Xingyang Li ◽  
Vincent Stevenson ◽  
Nevin Widarman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Contrast Agents ◽  
Inductively Coupled Plasma ◽  
Organometallic Compounds ◽  
Atomic Emission ◽  
Platinum Group Metals ◽  
Resonance Spectroscopy ◽  
Plasma Atomic Emission ◽  
Inductively Coupled

<p>Hyperpolarization techniques based on the use of parahydrogen provide orders of magnitude signal enhancement for magnetic resonance spectroscopy and imaging. The main drawback limiting widespread applicability of parahydrogen-based techniques in biomedicine is the presence of organometallic compounds (the polarization transfer catalysts) in solution with hyperpolarized contrast agents. These catalysts are typically complexes of platinum-group metals and their administration in vivo should be avoided.</p> <p><br></p><p>Herein, we show how extraction of a hyperpolarized compound from an organic phase to an aqueous phase combined with a rapid (less than 10 seconds) Ir-based catalyst capture by metal scavenging agents can produce pure parahydrogen-based hyperpolarized contrast agents as demonstrated by high-resolution nuclear magnetic resonance (NMR) spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The presented methodology enables fast and efficient means of producing pure hyperpolarized aqueous solutions for biomedical and other uses.</p>

Rapid Catalyst Capture Enables Metal-Free Parahydrogen-Based Hyperpolarized Contrast Agents

2018 ◽  
Author(s):  
Danila Barskiy ◽  
Lucia Ke ◽  
Xingyang Li ◽  
Vincent Stevenson ◽  
Nevin Widarman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Contrast Agents ◽  
Inductively Coupled Plasma ◽  
Organometallic Compounds ◽  
Atomic Emission ◽  
Platinum Group Metals ◽  
Resonance Spectroscopy ◽  
Plasma Atomic Emission ◽  
Inductively Coupled

<p>Hyperpolarization techniques based on the use of parahydrogen provide orders of magnitude signal enhancement for magnetic resonance spectroscopy and imaging. The main drawback limiting widespread applicability of parahydrogen-based techniques in biomedicine is the presence of organometallic compounds (the polarization transfer catalysts) in solution with hyperpolarized contrast agents. These catalysts are typically complexes of platinum-group metals and their administration in vivo should be avoided.</p> <p><br></p><p>Herein, we show how extraction of a hyperpolarized compound from an organic phase to an aqueous phase combined with a rapid (less than 10 seconds) Ir-based catalyst capture by metal scavenging agents can produce pure parahydrogen-based hyperpolarized contrast agents as demonstrated by high-resolution nuclear magnetic resonance (NMR) spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The presented methodology enables fast and efficient means of producing pure hyperpolarized aqueous solutions for biomedical and other uses.</p>

Silicate analysis of carbonated rocks using ICP-AES with calibration by the concentration ratio

2020 ◽  
Vol 86 (5) ◽  
pp. 16-21
Author(s):  
T. A. Karimova ◽  
G. L. Buchbinder ◽  
S. V. Kachin
Keyword(s):  
Inductively Coupled Plasma ◽  
Concentration Ratio ◽  
Total Error ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Calibration Error ◽  
Plasma Atomic Emission Spectrometry ◽  
Standard Samples ◽  
Inductively Coupled ◽  
Carbonate Materials

Calibration by the concentration ratio provides better metrological characteristics compared to other calibration modes when using the inductively coupled plasma atomic emission spectrometry (ICP-AES) for analysis of geological samples and technical materials on their base. The main reasons for the observed improvement are: i) elimination of the calibration error of measuring vessels and the error of weighing samples of the analyzed materials from the total error of the analysis; ii) high intensity of the lines of base element; and iii) higher accuracy of measuring the ratio of intensities compared to that of measuring the absolute intensities. Calcium oxide is better suited as a base when using calibration by the concentration ratio in analysis of carbonate rocks, technical materials, slags containing less than 20% SiO2 and more than 20% CaO. An equation is derived to calculate the content of components determined in carbonate materials when using calibration by the concentration ratio. A method of ICP-AES with calibration by the concentration ratio is developed for determination of CaO (in the range of contents 20 – 100%), SiO2 (2.0 – 35%), Al2O3 (0.1 – 30%), MgO (0.1 – 20%), Fe2O3 (0.5 – 40%), Na2O (0.1 – 15%), K2O (0.1 – 5%), P2O5 (0.001 – 2%), MnO (0.01 – 2%), TiO2 (0.01 – 2.0%) in various carbonate materials. Acid decomposition of the samples in closed vessels heated in a HotBlock 200 system is proposed. Correctness of the procedure is confirmed in analysis of standard samples of rocks. The developed procedure was used during the interlaboratory analysis of the standard sample of slag SH17 produced by ZAO ISO (Yekaterinburg, Russia).

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