Improving the Performance of BaMnO3 Perovskite as Soot Oxidation Catalyst Using Carbon Black during Sol-Gel Synthesis

A series of BaMnO3 solids (BM-CX) were prepared by a modified sol-gel method in which a carbon black (VULCAN XC-72R), and different calcination temperatures (600 °C–850 °C) were used. The fresh and used catalysts were characterized by ICP-OES, XRD, XPS, FESEM, TEM, O2-TPD and H2- TPR-. The characterization results indicate that the use of low calcination temperatures in the presence of carbon black allows decreasing the sintering effects and achieving some improvements regarding BM reference catalyst: (i) smaller average crystal and particles size, (ii) a slight increase in the BET surface area, (iii) a decrease in the macropores diameter range and, (iv) a lower temperature for the reduction of manganese. The hydrogen consumption confirms Mn(III) and Mn(IV) are presented in the samples, Mn(III) being the main oxidation state. The BM-CX catalysts series shows an improved catalytic performance regarding BM reference catalyst for oxidation processes (NO to NO2 and NO2-assisted soot oxidation), promoting higher stability and higher CO2 selectivity. BM-C700 shows the best catalytic performance, i.e., the highest thermal stability and a high initial soot oxidation rate, which decreases the accumulation of soot during the soot oxidation and, consequently, minimizes the catalyst deactivation.

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Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance

Materials ◽

10.3390/ma12203436 ◽

2019 ◽

Vol 12 (20) ◽

pp. 3436 ◽

Cited By ~ 1

Author(s):

Amar Bendieb Aberkane ◽

María Pilar Yeste ◽

Djazi Fayçal ◽

Daniel Goma ◽

Miguel Ángel Cauqui

Keyword(s):

Electron Microscopy ◽

Surface Area ◽

Mixed Oxide ◽

Soot Oxidation ◽

Catalytic Performance ◽

Coprecipitation Method ◽

Bet Surface Area ◽

Mixed Oxide Catalysts ◽

Ph Values ◽

Tight Contact

A series of NiO–CeO2 mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO–CeO2 mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer–Emmett–Teller (BET) surface area, H2 temperature-programmed reduction (H2-TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO2 supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni2+ was incorporated into the ceria network, and it appeared that the amount on Ni2+ that replaced Ce4+ was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance.

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Synthesis of Carbon Nanofiber-Titania-Cordierite Monolith Composite and its Application as Catalyst Support on Citral Hydrogenation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.535-537.178 ◽

2012 ◽

Vol 535-537 ◽

pp. 178-185 ◽

Cited By ~ 2

Author(s):

Jie Zhu ◽

Ming Shi Li ◽

Mo Hong Lu

Keyword(s):

Surface Area ◽

Carbon Nanofiber ◽

Sol Gel ◽

Catalyst Support ◽

Textural Properties ◽

Mesoporous Structure ◽

Catalytic Performance ◽

Bet Surface Area ◽

Tetrabutyl Titanate ◽

Citral Hydrogenation

We reported the synthesis of a promising carbon nanofiber-titania-cordierite monolith composite (C/TiO2/monolith) and its application in citral hydrogenation. The composite was synthesized through two steps: TiO2 coating on the surface of the monolith with sol-gel method and the following carbon deposit by methane decomposition. C/TiO2/monolith was subsequently employed to prepare its supported palladium catalyst, Pd/C/TiO2/monolith and its catalytic performance was evaluated in selective hydrogenation of citral. Results revealed that 2.0 wt% tetrabutyl titanate sol in composite synthesis was the best in improving textural properties of C/TiO2/monolith. The optimal composite possessed a BET surface area of 39.4 m2/g and micropore area accounted for only 3.8% of its total BET surface area. It contained about 30 wt% of carbon, which was mainly composed of carbon nanofiber. Pd/C/TiO2/monolith exhibited the high citronellal selectivity (81%) at 90% citral conversion, which was attributed to the decrease of internal diffusion limitation due to its mesoporous structure.

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Synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by Perchlorated Zirconia (HClO4/ZrO2) nanoparticles as a novel solid acid catalyst

Nanoscience and Nanotechnology ◽

10.18063/nn.v0i0.449 ◽

2018 ◽

Vol 2 (2) ◽

Author(s):

Seyed Yousef Mosavian

Keyword(s):

Solid Acid ◽

Condensation Reaction ◽

Solid Acid Catalyst ◽

Sol Gel ◽

Acid Catalyst ◽

Catalytic Performance ◽

Acid Sites ◽

Zro2 Nanoparticles ◽

Calcination Temperatures ◽

Aldehydes And Ketones

Zirconia was synthesized in nanosize by sol-gel method and perchlorated zirconia (HClO4/ZrO2) with various calcination temperatures were prepared and characterized by XRD, FTIR and SEM techniques. The catalyst acidity characters, including the acidicstrength and the total number of acid sites were determined by potentiometric titration. The catalytic performance experiments show that the HClO4/ZrO2 with calcination temperature of 300 °C has the best catalytic activity. 2,3-Dihydroquinazolin-4(1H)-ones wereprepared in good to excellent yields via condensation reaction of oaminobenzamide and various types of aldehydes and ketones in the presence of HClO4/ZrO2 nanoparticles as an efficient solid acid catalyst. The catalyst is reusable with moderate loss in activity.

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Effect of Copper Nanoparticles Dispersion on Catalytic Performance of Cu/SiO2Catalyst for Hydrogenation of Dimethyl Oxalate to Ethylene Glycol

Journal of Nanomaterials ◽

10.1155/2013/629375 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Yajing Zhang ◽

Na Zheng ◽

Kangjun Wang ◽

Sujuan Zhang ◽

Jing Wu

Keyword(s):

Ethylene Glycol ◽

Copper Nanoparticles ◽

Photoelectron Spectroscopy ◽

Sol Gel ◽

Catalytic Performance ◽

Bet Surface Area ◽

X Ray ◽

Dimethyl Oxalate ◽

Effect Of Copper ◽

Average Size

Cu/SiO2catalysts, for the synthesis of ethylene glycol (EG) from hydrogenation of dimethyl oxalate (DMO), were prepared by ammonia-evaporation and sol-gel methods, respectively. The structure, size of copper nanoparticles, copper dispersion, and the surface chemical states were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) and N2adsorption. It is found the structures and catalytic performances of the catalysts were highly affected by the preparation method. The catalyst prepared by sol-gel method had smaller average size of copper nanoparticles (about 3-4 nm), better copper dispersion, higher Cu+/C0ratio and larger BET surface area, and higher DMO conversion and EG selectivity under the optimized reaction conditions.

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Preparation of Stellerite Loading Titanium Dioxide Photocatalyst and Its Catalytic Performance on Methyl Orange

Journal of Nanomaterials ◽

10.1155/2015/701589 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Hua Chen ◽

Jianhua Wang ◽

Huajun Wang ◽

Fei Yang ◽

Jia-nan Zhou ◽

...

Keyword(s):

Surface Area ◽

Sol Gel ◽

Catalytic Performance ◽

Bet Surface Area ◽

X Ray Diffraction ◽

Photocatalytic Ability ◽

X Ray ◽

Composite Photocatalysts ◽

Ft Ir ◽

Better Than

TiO2/stellerite composite photocatalysts were prepared by dispersing TiO2 onto the surface of HCl, NaOH, or NaCl treated stellerite using a sol-gel method. The materials were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), BET surface area analysis, and X-ray diffraction (XRD). HCl and NaCl modification result in the promotion of the pore formation at the stellerite surfaces and induced the microscopic changes, while the surface morphology and structure of the stellerite were almost ruined by NaOH modification. Supported TiO2 calcinated at 200°C presented anatase structure. The photocatalytic degradation activities of TiO2 loaded HCl and NaCl modified stellerite were better than that of natural stellerite, accompanied with increasing specific surface area. On the contrary, NaOH modification induced the loss of photocatalytic ability of composite due to the generation of silicates.

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Synthesis of Mesoporous Nickel Phosphate with Long Hollow Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.625 ◽

2011 ◽

Vol 399-401 ◽

pp. 625-628 ◽

Cited By ~ 2

Author(s):

Juan Tan ◽

Xu Ying Li ◽

Fei Yang ◽

Jing Liu

Keyword(s):

Surface Area ◽

Pore Volume ◽

Sol Gel ◽

Catalytic Performance ◽

Bet Surface Area ◽

N2 Adsorption ◽

Gel Method ◽

Sol Gel Method ◽

Nickel Phosphate ◽

Ft Ir

Mesostructured nickel phosphate was synthesized with urea as alkali by sol-gel method. The obtained material nominated as NiPO-3 was characterized by means of XRD, ICP, FT-IR, TEM, and N2 adsorption. In contrast to mesoporous nickel phosphate NiPO-1 and NiPO-2 we reported before, NiPO-3 exhibits relatively longer nanotubes reached up to 400~600 nm. N2 adsorption shows that NiPO-3 possesses high BET surface area (345.8 m2g-1) and pore volume (0.46 cm3g-1). The catalytic performance of NiPO-3 showed that the total selectivity of epoxycyclohexane and hexadienol was as high as 83.38%.

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The Effect of Transition Metal Substitution in the Perovskite-Type Oxides on the Physicochemical Properties and the Catalytic Performance in Diesel Soot Oxidation

Catalysts ◽

10.3390/catal11101256 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1256

Author(s):

Liliya V. Yafarova ◽

Grigory V. Mamontov ◽

Irina V. Chislova ◽

Oleg I. Silyukov ◽

Irina A. Zvereva

Keyword(s):

Photoelectron Spectroscopy ◽

Sol Gel ◽

Simultaneous Thermal Analysis ◽

Cobalt Content ◽

Soot Oxidation ◽

Substitution Effect ◽

Catalytic Performance ◽

Oxygen Mobility ◽

X Ray ◽

Temperature Programmed

The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by various methods: X-Ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorption, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an improvement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.

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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

International Review of Applied Sciences and Engineering ◽

10.1556/1848.2020.00007 ◽

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.

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

Oriental Journal Of Chemistry ◽

10.13005/ojc/350303 ◽

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

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Synthesis and Catalytic Performance of Ni/SiO2for Hydrogenation of 2-Methylfuran to 2-Methyltetrahydrofuran

Journal of Nanomaterials ◽

10.1155/2015/791529 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Fu Ding ◽

Yajing Zhang ◽

Guijin Yuan ◽

Kangjun Wang ◽

Ileana Dragutan ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Sol Gel ◽

Catalytic Performance ◽

Bet Surface Area ◽

X Ray Diffraction ◽

X Ray ◽

Ni Content ◽

Transmission Electron ◽

Temperature Programmed ◽

Ni Species

A series of Ni/SiO2catalysts with different Ni content were prepared by sol-gel method for application in the synthesis of 2-methyltetrahydrofuran (2-MTHF) by hydrogenation of 2-methylfuran (2-MF). The catalyst structure was investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (TPR). It is found that structures and catalytic performance of the catalysts were highly affected by the Ni content. The catalyst with a 25% Ni content had an appropriate size of the Ni species and larger BET surface area and produced a higher 2-MF conversion with enhanced selectivity in 2-MTHF.

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