Promoting Effects of Ni for Toluene Catalytic Combustion Over CoNi/TiO2 Oxide Catalysts

2018 ◽  
Vol 16 (6) ◽  
Author(s):  
Hongmei Xie ◽  
Deping Xia ◽  
Guilin Zhou
Keyword(s):  
Catalytic Combustion ◽  
Chemical Properties ◽  
Oxide Catalysts ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Oxygen Species ◽  
Composite Oxide ◽  
Surface Hydroxyl ◽  
Composite Catalysts ◽  
Ni Species

AbstractThe supported CoNi/TiO2composite oxide catalysts were prepared by impregnation method. The physical and chemical properties of the prepared catalysts were studied by XRD, XPS and H2-TPR. The results show that the Co3O4, NiO and NiCo2O4species are formed in the CoNi/TiO2composite oxide catalysts. The interaction between the Co and Ni species can effectively enhance the properties of the CoNi/TiO2oxide catalysts. The introduction of Ni species can effectively enhance the surface hydroxyl oxygen species and adsorbed oxygen species content, and the Co3+species content can be enhanced on the surface of the prepared CoNi/TiO2composite oxide catalysts. The low temperature reducibility and toluene catalytic combustion activity of the CoNi/TiO2composite oxide catalysts can be improved by the Ni species. The toluene catalytic combustion activity of CoNi/TiO2composite catalysts can be obviously affected by the Co/Ni molar ratio. The CoNi/TiO2composite oxide catalyst, which has a Co/Ni molar ratio of 1.0, has the best toluene catalytic combustion activity and wide scope of the concentration of toluene. The toluene catalytic combustion conversion can exceed 99 % at 340 °C. That is to say, the toluene concentration in air can be decreased to 80 ppm from 8000 ppm.

High Efficiency CeCu Composite Oxide Catalysts Improved via Preparation Methods for Propyl Acetate Catalytic Combustion in Air

2016 ◽  
Vol 14 (3) ◽  
pp. 757-768 ◽  
Author(s):  
Hai Lan ◽  
Guilin Zhou ◽  
Cuijuan Luo ◽  
Yinrong Yu ◽  
Hongmei Xie ◽  
...  
Keyword(s):  
Solid Solution ◽  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Oxide Catalysts ◽  
Oxygen Species ◽  
Propyl Acetate ◽  
Composite Oxide ◽  
Oxygen Desorption ◽  
Adsorbed Oxygen Species ◽  
Oxide Solid Solution

Abstract A famous hard-template method (HT), coprecipitation method (PC), and complex method (CA) were used to prepare CeCu composite oxide catalysts. The prepared catalysts were characterized via XRD, BET, Raman, XPS, FI–IR, and O2–TPD, and their catalytic activity and stability were evaluated for the propyl acetate catalytic combustion. The results showed that the CeCu oxide solid solution and oxygen vacancies were formed in the prepared CeCu oxide catalysts, even for CeCu–PC and CeCu–CA having a specific amount of isolated crystalline or amorphous CuO species. Comparing with the CeCu–PC and CeCu–CA of low porosity, CeCu–HT developed a mesoporous structure with a much larger specific surface area through a negative replica on the structure of KIT-6, and in it, CuO was completely dissolved in the CeO2 lattice to form more CeCu oxide solid solution and a large amount of oxygen vacancies. As a result, the CeCu–HT catalyst has more surface-adsorbed oxygen species, more –OH group which can also change into surface-adsorbed oxygen species at relatively high temperatures, higher oxygen desorption ability, and higher oxygen mobility than CeCu–PC and CeCu–CA. The CeCu–HT catalyst shows high and stable propyl acetate catalytic combustion performance at 190 °C. The propyl acetate catalytic combustion activity on the prepared CeCu oxide catalysts can be ranked as: CeCu–HT > CeCu–PC > CeCu–CA, which follows the orders of CeCu oxide solid solution content, surface-active oxygen content, and oxygen desorption and mobility of the CeCu composite oxide catalysts.

scholarly journals Nanosheet-Like Ho2O3 and Sr-Ho2O3 Catalysts for Oxidative Coupling of Methane

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 388
Author(s):  
Yuqiao Fan ◽  
Changxi Miao ◽  
Yinghong Yue ◽  
Weiming Hua ◽  
Zi Gao
Keyword(s):  
Oxidative Coupling ◽  
Temperature Programmed Desorption ◽  
Oxidative Coupling Of Methane ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Oxygen Species ◽  
N2 Adsorption ◽  
Basic Sites ◽  
Chemisorbed Oxygen ◽  
Temperature Programmed

In this work, Ho2O3 nanosheets were synthesized by a hydrothermal method. A series of Sr-modified Ho2O3 nanosheets (Sr-Ho2O3-NS) with a Sr/Ho molar ratio between 0.02 and 0.06 were prepared via an impregnation method. These catalysts were characterized by several techniques such as XRD, N2 adsorption, SEM, TEM, XPS, O2-TPD (temperature-programmed desorption), and CO2-TPD, and they were studied with respect to their performances in the oxidative coupling of methane (OCM). In contrast to Ho2O3 nanoparticles, Ho2O3 nanosheets display greater CH4 conversion and C2-C3 selectivity, which could be related to the preferentially exposed (222) facet on the surface of the latter catalyst. The incorporation of small amounts of Sr into Ho2O3 nanosheets leads to a higher ratio of (O− + O2−)/O2− as well as an enhanced amount of chemisorbed oxygen species and moderate basic sites, which in turn improves the OCM performance. The optimal catalytic behavior is achievable on the 0.04Sr-Ho2O3-NS catalyst with a Sr/Ho molar ratio of 0.04, which gives a 24.0% conversion of CH4 with 56.7% selectivity to C2-C3 at 650 °C. The C2-C3 yield is well correlated with the amount of moderate basic sites present on the catalysts.

Effects of Carrier on Supported Rare Earth Double Perovskite Oxide Catalysts for Catalytic Combustion of Methane

2012 ◽  
Vol 512-515 ◽  
pp. 1601-1606 ◽  
Author(s):  
Ran Ran Ding ◽  
Jia Nan Hu ◽  
Rui Sheng Hu ◽  
Ying Liu ◽  
Ling Jie Wang
Keyword(s):  
Rare Earth ◽  
Catalytic Combustion ◽  
Supported Catalyst ◽  
Double Perovskite ◽  
Active Phase ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Perovskite Oxide ◽  
Impregnation Method ◽  
Oxide Support

Supported rare earth double perovskite (La2MnNiO6) oxide catalysts were prepared by incipient wet impregnation method for methane catalytic combustion, and effects of the support (Al2O3, ZrO2 and MgO) were investigated. The loaded catalysts were characterized by means of XRD, TPR, SEM techniques and their catalytic activities were tested by complete methane oxidation. Depending on the different oxide carrier (e.g. Al2O3, MgO and ZrO2), catalysts have different catalytic properties, because the interaction of metal oxide-support will affect both redox property and dispersity of the active phase. The results on catalysts have shown that the dispersion on Al2O3 and MgO supports had an effect to enhance the catalytic performances of the catalysts that had been treated at 1100 oC. The activity of ZrO2 supported catalyst significantly decreases when calcination temperature at is 1100 oC. The dispersity of the active phase and the nature of the oxide carrier played an important role in the catalytic performance.

scholarly journals Characteristics and activity of Ni/CeO2 catalyst modified by Cr2O3 in combined steam and CO2 reforming of CH4

2021 ◽  
Vol 10 (1) ◽  
pp. 104-108
Author(s):  
Phuong Phan Hong ◽  
Anh Nguyen Phung ◽  
Huy Tran Anh ◽  
Tri Nguyen ◽  
Loc Luu Cam
Keyword(s):  
Chemical Properties ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Co2 Reforming ◽  
X Ray ◽  
Co2 Reforming Of Ch4 ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Temperature Programmed

A series of 10%wtNiO/CeO2-nanorod catalyst without and with Cr2O3 additive was prepared by simultaneous impregnation method. Several techniques, including N2 physisorption measurements, X-ray powder diffraction (XRD), temperature-programmed reduction using H2 (H2-TPR), CO2 temperature-programmed desorption (CO2-TPD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to investigate catalysts’ physico-chemical properties. The activity of the catalysts in combined steam and CO2 reforming of CH4 (BRM) was investigated at temperature range of 550-800 °C. The results showed that 10%NiO0.1%Cr2O3/CeO2 catalyst had the best catalytic performance due to a better reducibility and basicity. At 700 °C and CH4:CO2:H2O molar ratio in feed stream of 3:1.2:2.4, both conversion of CH4 and CO2 on this catalyst reached 98.5%.

scholarly journals Biodiesel Production from Sunflower Oil Using K2CO3 Impregnated Kaolin Novel Solid Base Catalyst

2020 ◽  
Author(s):  
Shayan Jalalmanesh ◽  
Mohammad Kazemeini ◽  
Mohamad Hosein Rahmani ◽  
Milad Zehtab Salmasi
Keyword(s):  
Sunflower Oil ◽  
Chemical Properties ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Solid Base ◽  
Clay Material ◽  
Impregnation Method ◽  
Oil Concentration ◽  
Optimum Reaction

<div><div><div><div><p>Kaolin clay material was loaded with potassium carbonate by impregnation method as a novel effective and economical heterogeneous catalyst for biodiesel production of sunflower oil via the transesterification reaction. The structural and chemical properties of the produced catalysts were analyzed by several characterization tests including the BET-BJH, XRD, SEM and FTIR. Influence of the K2CO3 impregnation level was examined by comparing the catalytic activity of different produced catalysts. To expand the efficiency of transesterification reaction, parameters of reaction were optimized including; the molar ratio between methanol and oil, concentration of catalyst, and duration of the reaction. The highest yield of biodiesel over the K2CO3/kaolin catalyst was around 95.3 ± 1.2%. It was achieved using kaolin supports impregnated with 20 wt.% of K2CO3. The optimum reaction conditions were found to be catalyst reactor loading of 5 wt.%, reaction temperature of 65 °C, methanol: oil molar ratio of 6:1 and reaction duration time of 4 h.</p></div></div></div></div>

scholarly journals Biodiesel Production from Sunflower Oil Using K2CO3 Impregnated Kaolin Novel Solid Base Catalyst

2020 ◽  
Author(s):  
Shayan Jalalmanesh ◽  
Mohammad Kazemeini ◽  
Mohamad Hosein Rahmani ◽  
Milad Zehtab Salmasi
Keyword(s):  
Sunflower Oil ◽  
Chemical Properties ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Solid Base ◽  
Clay Material ◽  
Impregnation Method ◽  
Oil Concentration ◽  
Optimum Reaction

<div><div><div><div><p>Kaolin clay material was loaded with potassium carbonate by impregnation method as a novel effective and economical heterogeneous catalyst for biodiesel production of sunflower oil via the transesterification reaction. The structural and chemical properties of the produced catalysts were analyzed by several characterization tests including the BET-BJH, XRD, SEM and FTIR. Influence of the K2CO3 impregnation level was examined by comparing the catalytic activity of different produced catalysts. To expand the efficiency of transesterification reaction, parameters of reaction were optimized including; the molar ratio between methanol and oil, concentration of catalyst, and duration of the reaction. The highest yield of biodiesel over the K2CO3/kaolin catalyst was around 95.3 ± 1.2%. It was achieved using kaolin supports impregnated with 20 wt.% of K2CO3. The optimum reaction conditions were found to be catalyst reactor loading of 5 wt.%, reaction temperature of 65 °C, methanol: oil molar ratio of 6:1 and reaction duration time of 4 h.</p></div></div></div></div>

scholarly journals Biodiesel Production from Sunflower Oil Using K2CO3 Impregnated Kaolin Novel Solid Base Catalyst

2020 ◽  
Author(s):  
Shayan Jalalmanesh ◽  
Mohammad Kazemeini ◽  
mohamad hosein rahmani ◽  
Milad Zehtab Salmasi
Keyword(s):  
Sunflower Oil ◽  
Chemical Properties ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Solid Base ◽  
Clay Material ◽  
Impregnation Method ◽  
Oil Concentration ◽  
Optimum Reaction

<div><div><div><div><p>Kaolin clay material was loaded with potassium carbonate by impregnation method as a novel effective and economical heterogeneous catalyst for biodiesel production of sunflower oil via the transesterification reaction. The structural and chemical properties of the produced catalysts were analyzed by several characterization tests including the BET-BJH, XRD, SEM and FTIR. Influence of the K2CO3 impregnation level was examined by comparing the catalytic activity of different produced catalysts. To expand the efficiency of transesterification reaction, parameters of reaction were optimized including; the molar ratio between methanol and oil, concentration of catalyst, and duration of the reaction. The highest yield of biodiesel over the K2CO3/kaolin catalyst was around 95.3 ± 1.2%. It was achieved using kaolin supports impregnated with 20 wt.% of K2CO3. The optimum reaction conditions were found to be catalyst reactor loading of 5 wt.%, reaction temperature of 65 °C, methanol: oil molar ratio of 6:1 and reaction duration time of 4 h.</p></div></div></div></div>

scholarly journals Biodiesel Production from Sunflower Oil Using K2CO3 Impregnated Kaolin Novel Solid Base Catalyst

2020 ◽  
Author(s):  
Shayan Jalalmanesh ◽  
Mohammad Kazemeini ◽  
mohamad hosein rahmani ◽  
milad zehtab
Keyword(s):  
Sunflower Oil ◽  
Chemical Properties ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Solid Base ◽  
Clay Material ◽  
Impregnation Method ◽  
Oil Concentration ◽  
Optimum Reaction

<div><div><div><div><p>Kaolin clay material was loaded with potassium carbonate by impregnation method as a novel effective and economical heterogeneous catalyst for biodiesel production of sunflower oil via the transesterification reaction. The structural and chemical properties of the produced catalysts were analyzed by several characterization tests including the BET-BJH, XRD, SEM and FTIR. Influence of the K2CO3 impregnation level was examined by comparing the catalytic activity of different produced catalysts. To expand the efficiency of transesterification reaction, parameters of reaction were optimized including; the molar ratio between methanol and oil, concentration of catalyst, and duration of the reaction. The highest yield of biodiesel over the K2CO3/kaolin catalyst was around 95.3 ± 1.2%. It was achieved using kaolin supports impregnated with 20 wt.% of K2CO3. The optimum reaction conditions were found to be catalyst reactor loading of 5 wt.%, reaction temperature of 65 °C, methanol: oil molar ratio of 6:1 and reaction duration time of 4 h.</p></div></div></div></div>

scholarly journals Biodiesel Production from Sunflower Oil Using K2CO3 Impregnated Kaolin Novel Solid Base Catalyst

2020 ◽  
Author(s):  
Shayan Jalalmanesh ◽  
Mohammad Kazemeini ◽  
mohamad hosein rahmani ◽  
milad zehtab
Keyword(s):  
Sunflower Oil ◽  
Chemical Properties ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Solid Base ◽  
Clay Material ◽  
Impregnation Method ◽  
Oil Concentration ◽  
Optimum Reaction

<div><div><div><div><p>Kaolin clay material was loaded with potassium carbonate by impregnation method as a novel effective and economical heterogeneous catalyst for biodiesel production of sunflower oil via the transesterification reaction. The structural and chemical properties of the produced catalysts were analyzed by several characterization tests including the BET-BJH, XRD, SEM and FTIR. Influence of the K2CO3 impregnation level was examined by comparing the catalytic activity of different produced catalysts. To expand the efficiency of transesterification reaction, parameters of reaction were optimized including; the molar ratio between methanol and oil, concentration of catalyst, and duration of the reaction. The highest yield of biodiesel over the K2CO3/kaolin catalyst was around 95.3 ± 1.2%. It was achieved using kaolin supports impregnated with 20 wt.% of K2CO3. The optimum reaction conditions were found to be catalyst reactor loading of 5 wt.%, reaction temperature of 65 °C, methanol: oil molar ratio of 6:1 and reaction duration time of 4 h.</p></div></div></div></div>

Sign in / Sign up

Export Citation Format

Share Document