Study of Co-Mn/TiO2 SCR Catalyst at Low Temperature

2015 ◽  
Vol 1102 ◽  
pp. 11-16 ◽  
Author(s):  
Hua Hu ◽  
Jun Lin Xie ◽  
De Fang ◽  
Feng He
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Chemical Characteristics ◽  
Impregnation Method ◽  
Scr Catalyst ◽  
No Conversion ◽  
Co Doping ◽  
Phase Structures ◽  
Adsorption Capacities ◽  
Physical And Chemical

The Co-Mn/TiO2 catalysts with different contents of Co were prepared by the impregnation method. Catalytic activity tests showed that the addition of Co could obviously enhance the SCR performance of Mn/TiO2 catalyst, and the NO conversion of 0.05Co-Mn/TiO2 samples could reach 94.03% at 180 °C. At the same time, with the help of XRD, BET, H2-TPR and NH3-TPD, the various physical and chemical characteristics as well as phase structures of catalysts were characterized systematically. According to the results, the formations of crystalline CoMn2O4, Mn3O4 and amorphous Mn2O3 were detected. Furthermore, Co doping could reduce the reduction temperatures of catalysts and enhance the adsorption capacities of NH3, resulting in the excellent SCR performance at low temperature.

scholarly journals The Poisoning Effect of Na Doping over Mn-Ce/TiO2Catalyst for Low-Temperature Selective Catalytic Reduction of NO by NH3

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Liu Yang ◽  
Yue Tan ◽  
Zhongyi Sheng ◽  
Aiyi Zhou
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Chemical Properties ◽  
Impregnation Method ◽  
Negative Effects ◽  
Poisoning Effect ◽  
Surface Areas ◽  
Physical And Chemical

Sodium carbonate (Na2CO3), sodium nitrate (NaNO3), and sodium chloride (NaCl) were chosen as the precursors to prepare the Na salts deposited Mn-Ce/TiO2catalysts through an impregnation method. The influence of Na on the performance of the Mn-Ce/TiO2catalyst for low-temperature selective catalytic reduction ofNOxby NH3was investigated. Experimental results showed that Na salts had negative effects on the activity of Mn-Ce/TiO2and the precursors of Na salts also affected the catalytic activity. The precursor Na2CO3had a greater impact on the catalytic activity, while NaNO3had minimal effect. The characterization results indicated that the significant changes in physical and chemical properties of Mn-Ce/TiO2were observed after Na was doped on the catalysts. The significant decreases in surface areas and NH3adsorption amounts were observed after Na was doped on the catalysts, which could be considered as the main reasons for the deactivation of Na deposited Mn-Ce/TiO2.

scholarly journals CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 724 ◽  
Author(s):  
Yan Cui ◽  
Leilei Xu ◽  
Mindong Chen ◽  
Chufei Lv ◽  
Xinbo Lian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Co Oxidation ◽  
Active Sites ◽  
Earth Metal ◽  
High Dispersion ◽  
Impregnation Method ◽  
X Ray

CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2 support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2 temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3 showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2 solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.

Preparation of Ni/ZrO2/SiO2 Catalyst and its Application in Hydrogenation of CO2 to Methane

2020 ◽  
Vol 1001 ◽  
pp. 79-83
Author(s):  
Zhen Xing Han ◽  
Si Xi Guo ◽  
Kai Ming Li ◽  
Bing Yao ◽  
Ming Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Catalytic Performance ◽  
Experimental Results ◽  
Impregnation Method ◽  
Energy And Environment ◽  
Supported Ni ◽  
Hydrogenation Of Co

The hydrogenation of CO2 to CH4 can realize the utilization of CO2, which has an important implications to both the energy and environment. As a result of the low catalytic activity of the supported Ni/SiO2 catalyst, the ZrO2 is added to improve its catalytic performance by the impregnation method. The experimental results show that ZrO2 is an effective promoter to enhance the low-temperature catalytic activity of Ni/SiO2 catalyst.

scholarly journals Fabrication of titanium carburizing electrodes for capacitive deionization

2017 ◽  
Vol 76 (4) ◽  
pp. 754-760 ◽  
Author(s):  
Wang Li ◽  
Lei Lei ◽  
Zhou Yun ◽  
Fu Jiangtao
Keyword(s):  
Magnetron Sputtering ◽  
High Vacuum ◽  
Chemical Deposition ◽  
Electrochemical Analysis ◽  
Chemical Characteristics ◽  
Capacitive Deionization ◽  
Practical Application ◽  
Adsorption Capacities ◽  
Novel Method ◽  
Physical And Chemical

Titanium carburizing electrodes were used as the electrodes in a capacitive deionization (CDI) process for desalination in this study. Two methods of high vacuum magnetron sputtering and chemical deposition were used for the preparation of nano-titanium carburizing electrodes (named Ti-C* and Ti-C**). By comparing the adsorption capacities of different kinds of electrode material, combined with physical and chemical characteristics and electrochemical analysis, the method of high vacuum magnetron sputtering to prepare Ti-C* electrodes have been proved successful for the CDI process. The results show that under the same conditions, the adsorption capacity of Ti-C* and Ti-C**were 9.6 mg/g and 7.12 mg/g, respectively. The Ti-C* electrodes showed a higher ion electrosorption capacity than Ti-C** and the electrodes can be easily regenerated, indicating excellent recyclability. This study provided a novel method to fabricate titanium carburizing electrodes in CDI process and might lead to the improvement of the CDI desalination performance in an industrial practical application.

Studies on the Preparation and DeNOx Performance of MnxOy/CNTs Catalyst for Low-Temperature Selective Catalytic Reduction

2013 ◽  
Vol 798-799 ◽  
pp. 231-234 ◽  
Author(s):  
Bing Nan Ren ◽  
Qiao Wen Yang
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Oxide Catalyst ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Impregnation Method ◽  
Active Components ◽  
Reaction Conditions ◽  
No Conversion ◽  
Scr Of No

The metal oxide catalyst was prepared by loading MnxOyon carbon nanotubes (CNTs) with impregnation method. Then the catalyst was characterized by BET, TEM and XPS, and the catalytic activity of the catalyst for selective catalytic reduction (SCR) of NO at low-temperature was investigated. The results showed that the species of active components loaded on the catalyst were MnO2and Mn2O3. The NO conversion was improved with reduction temperature increase under 250°C, increased slowly over 250°C. The O2content had an outstanding effect on NO conversion of catalysts at a low concentration range. Once the oxygen content was enhanced over 5%, there was no significant increase in the NO conversion. With the increasing of space velocity, the NO conversion rate was decreased under the reaction conditions.

scholarly journals Sulfur resistance of Ce-Mn/TiO 2 catalysts for low-temperature NH 3 –SCR

2018 ◽  
Vol 5 (3) ◽  
pp. 171846 ◽  
Author(s):  
Quan Xu ◽  
Wenjing Yang ◽  
Shitong Cui ◽  
Jason Street ◽  
Yan Luo
Keyword(s):  
Low Temperature ◽  
Photoelectron Spectroscopy ◽  
Conversion Rate ◽  
Active Sites ◽  
Sol Gel ◽  
Textural Properties ◽  
Catalyst Loading ◽  
Impregnation Method ◽  
No Conversion ◽  
X Ray

Ce-Mn/TiO 2 catalyst prepared using a simple impregnation method demonstrated a better low-temperature selective catalytic reduction of NO with NH 3 (NH 3 –SCR) activity in comparison with the sol-gel method. The Ce-Mn/TiO 2 catalyst loading with 20% Ce had the best low-temperature activity and achieved a NO conversion rate higher than 90% at 140–260°C with a 99.7% NO conversion rate at 180°C. The Ce-Mn/TiO 2 catalyst only had a 6% NO conversion rate decrease after 100 ppm of SO 2 was added to the stream. When SO 2 was removed from the stream, the catalyst was able to recover completely. The crystal structure, morphology, textural properties and valence state of the metals involving the novel catalysts were investigated using X-ray diffraction, N 2 adsorption and desorption analysis, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive spectroscopy, respectively. The decrease of NH 3 –SCR performance in the presence of 100 ppm SO 2 was due to the decrease of the surface area, change of the pore structure, the decrease of Ce 4+ and Mn 4+ concentration and the formation of the sulfur phase chemicals which blocked the active sites and changed the valence status of the elements.

The Effects of SiO2 and CeO2 Addition on the Performances of MnOx/TiO2 Catalysts

2016 ◽  
Vol 69 (10) ◽  
pp. 1180
Author(s):  
Juhua Luo ◽  
Hongkai Mao ◽  
Xu Wang ◽  
Wei Yao
Keyword(s):  
Low Temperature ◽  
Pore Diameter ◽  
Catalytic Reduction ◽  
Pure Tio2 ◽  
Precipitation Method ◽  
Impregnation Method ◽  
Average Pore ◽  
Reduction Of No ◽  
No Conversion ◽  
Co Precipitation

A TiO2-SiO2 mixed oxide was obtained by a co-precipitation method. MnOx-CeO2/TiO2-SiO2 were prepared by an impregnation method and their activity towards the selective catalytic reduction of NO with NH3 at low temperature were evaluated. Compared with pure TiO2, TiO2-SiO2 exhibited an evidently larger surface area and pore volume, and a smaller average pore diameter with narrow distribution. The NO conversion of the MnOx/TiO2-SiO2 catalyst could be improved by the addition of an appropriate amount of CeO2 in the temperature range of 100–180°C. MnOx-CeO2/TiO2-SiO2 with 10 wt-% CeO2 showed the highest activity with 96 % NO conversion at 180°C.

scholarly journals Investigating the effects of depressant additives on the low temperature properties of petroleum products

2021 ◽  
pp. 57-60
Author(s):  
A. Sh. Zainullina ◽  
D. K. Sibatov
Keyword(s):  
Low Temperature ◽  
Cloud Point ◽  
Diesel Fuel ◽  
Pour Point ◽  
Kinematic Viscosity ◽  
Point Cloud ◽  
Petroleum Products ◽  
Chemical Characteristics ◽  
Cold Filter Plugging Point ◽  
Physical And Chemical

The article is devoted to the study of the low temperature properties of petroleum products and the influence of depressant additives on former. The objects of the study are the summer mark diesel fuel produced by «ПетроКоммерцОйлКазахстан» and depressant additives of «AGA», «MANNOL», «FENOM», «CYCLO C-24» brands. Such physical and chemical characteristics of petroleum products as flashpoint, pour point, cloud point, cold filter plugging point and kinematic viscosity of pure diesel fuel at the presence and absence of depressor additives of brands listed above. The best performance among studied additives is shown by «MANNOL» brand additive.

Effect on Addictives Adding of Mn-Ce/TiO2 Selective Catalytic Reduction NO by NH3 at Low-Temperature

2014 ◽  
Vol 955-959 ◽  
pp. 25-29 ◽  
Author(s):  
Bin Wu
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Conversion Efficiency ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Catalytic Conversion ◽  
No Conversion ◽  
Performance Results

Additives addition into Mn-Ce/TiO2 which had good low-temperature catalytic properties was studied, so as to improve its low-temperature anti-poisoning performance. Results showed that catalytic activity of Mn-Ce/TiO2 added additives V, Fe and Cu (short for Mn-M-Ce/TiO2 ) was improved all, compared with 95% NO conversion efficiency of Mn-Ce/TiO2 at temperature of 120°C, the ratio of Mn-M-Ce/TiO2 reached nearly 100%. Mn-Fe-Ce/TiO2 had the best single anti-poisoning ability, under the existence of 7% vapor, its catalytic conversion efficiency could be always kept over 90% at 120°C.The anti-SO2 poisoning ability at low-temperature reduced after adding additives Fe and Cu. catalytic conversion efficiency of Mn-Fe-Ce/TiO2 and Mn-Cu-Ce/TiO2 could be close to 90% at temperature of 180°C when water and SO2 exist simultaneously.

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