Study on the Mechanism of SCR NO by Mn-Ce/CNTs Catalyst at Low-Temperature

2013 ◽  
Vol 773 ◽  
pp. 645-648 ◽  
Author(s):  
Qiao Wen Yang ◽  
Peng Fei Li ◽  
Bing Nan Ren ◽  
Ying Zhu ◽  
Dong Yao Xu
Keyword(s):  
Low Temperature ◽  
Competitive Advantage ◽  
Catalyst Surface ◽  
Temperature Programmed Desorption ◽  
Adsorption Performance ◽  
Temperature Programmed ◽  
Scr System ◽  
Adsorption Desorption ◽  
Scr No

The prepared Mn-Ce/CNTs catalyst was tested with Temperature-Programmed Desorption (TPD) in this experiment. The adsorption – desorption of NO, NH3, O2on the surface of catalyst were studied and the mechanism of SCR was analyzed. The conclusions were as follows: NH3was easily absorbed on the surface of Mn-Ce/CNTs catalyst for its significant competitive advantage; it can restrain the absorption of NO. The adsorption performance of NH3on catalyst surface was far greater than NO. When NO, O2adsorbed on the catalyst at the same time, the desorption amount of NO from catalyst significantly was less than the NO absorbed only. This shows that the O2can promote the adsorption of NO on the catalyst in SCR system.

Basicity and Crystal Phase of Mesoporous K2O-MgO/ZrO2-La2O3 Catalyst

2014 ◽  
Vol 924 ◽  
pp. 269-274
Author(s):  
Yu Su ◽  
Guo Jun Dong ◽  
Cheng Yuan Wang ◽  
Jin Sheng Gao ◽  
Dong Sheng Ma ◽  
...  
Keyword(s):  
High Temperature ◽  
Monoclinic Phase ◽  
Dimethyl Carbonate ◽  
Catalyst Surface ◽  
Temperature Programmed Desorption ◽  
Solid Base ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Programmed ◽  
Adsorption Desorption

A new solid base, mesoporous K2O-MgO/ZrO2-La2O3, was prepared by hydrothermal and immersion process using a cationic surfactant C16H33(CH3)3NBr (CTAB) as template．The samples were characterized by N2 adsorption-desorption, X-ray diffraction(XRD), Raman spectroscope and CO2 temperature programmed desorption(CO2-TPD). XRD and Raman spectra indicated that the catalyst calcined at 600°C and 700 °C remained surface and bulk tetragonal phase and good mesoporous characteristics when the content of K2O is less than 0.5. While the monoclinic phase is appeared on catalyst surface when the content of K2O is more than 0.5 calcined at 700 °C. CO2-TPD proves that there are two adsorption states at high temperature corresponding to super alkaline sites of K2O and undecomposed KNO3. The catalyst with 0.4 mol ratio of K2O to ZrO2 calcined at 700 °C showed higher activity in the synthesis of di-2-ethylhexyl carbonate (DEHC) from dimethyl carbonate (DMC) and 2-ethylhexanol (EHOH).

Precursor chemistry of h-BN: adsorption, desorption, and decomposition of borazine on Pt(110)

2020 ◽  
Vol 22 (20) ◽  
pp. 11704-11712 ◽  
Author(s):  
Leander Haug ◽  
Jannik P. Roth ◽  
Marco Thaler ◽  
Dominik Steiner ◽  
Alexander Menzel ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Precursor Chemistry ◽  
Temperature Programmed Desorption ◽  
Photoemission Spectroscopy ◽  
Functional Theory ◽  
P Adsorption ◽  
Ultraviolet Photoemission Spectroscopy ◽  
Temperature Programmed ◽  
Adsorption Desorption

Adsorption, desorption and fragmentation of borazine on Pt(110) are studied by temperature-programmed desorption, ultraviolet photoemission spectroscopy, workfunction measurements and density functional theory.

scholarly journals Promotion Effect of CaO Modification on Mesoporous Al2O3-Supported Ni Catalysts for CO2Methanation

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Wen Yang ◽  
Yanyan Feng ◽  
Wei Chu
Keyword(s):  
Surface Coverage ◽  
Temperature Programmed Desorption ◽  
Impregnation Method ◽  
Nio Nanoparticles ◽  
X Ray Diffraction ◽  
Ni Catalysts ◽  
X Ray ◽  
Temperature Programmed ◽  
Adsorption Desorption ◽  
Supported Ni

The catalysts Ni/Al2O3and CaO modified Ni/Al2O3were prepared by impregnation method and applied for methanation of CO2. The catalysts were characterized by N2adsorption/desorption, temperature-programmed reduction of H2(H2-TPR), X-ray diffraction (XRD), and temperature-programmed desorption of CO2and H2(CO2-TPD and H2-TPD) techniques, respectively. TPR and XRD results indicated that CaO can effectively restrain the growth of NiO nanoparticles, improve the dispersion of NiO, and weaken the interaction between NiO and Al2O3. CO2-TPD and H2-TPD results suggested that CaO can change the environment surrounding of CO2and H2adsorption and thus the reactants on the Ni atoms can be activated more easily. The modified Ni/Al2O3showed better catalytic activity than pure Ni/Al2O3. Ni/CaO-Al2O3showed high CO2conversion especially at low temperatures compared to Ni/Al2O3, and the selectivity to CH4was very close to 1. The high CO2conversion over Ni/CaO-Al2O3was mainly caused by the surface coverage by CO2-derived species on CaO-Al2O3surface.

Hydrothermal synthesis of manganese oxide nanorods as a highly active support for gold nanoparticles in CO oxidation and their stability at low temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62732-62738 ◽  
Author(s):  
Yu-Xin Miao ◽  
Li-Hui Ren ◽  
Lei Shi ◽  
Wen-Cui Li
Keyword(s):  
Gold Nanoparticles ◽  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Co Oxidation ◽  
Temperature Programmed Desorption ◽  
Deposition Method ◽  
Highly Active ◽  
Colloidal Deposition ◽  
Oxide Nanorods ◽  
Temperature Programmed

One active Au/MnO2 catalysts were prepared by a colloidal deposition method. The deactivation was studied by temperature programmed desorption of CO2 analysis.

scholarly journals Catalytic oxidation of CO over CuO/CeO2 nanocomposites synthesized via solution combustion method: effect of fuels

2020 ◽  
Vol 59 (1) ◽  
pp. 131-143 ◽  
Author(s):  
Thanh Son Cam ◽  
Tatyana Alekseevna Vishnievskaia ◽  
Vadim Igorevich Popkov
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
X Ray ◽  
Low Temperature Co Oxidation ◽  
Temperature Programmed ◽  
Adsorption Desorption

AbstractA series of CuO/CeO2 catalysts were successfully synthesized via solution combustion method (SCS) using different fuels and tested for CO oxidation. The catalysts were characterized by energy-dispersive X-ray analysis (EDXA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), N2 adsorption-desorption isotherms and H2 temperature-programmed reduction (H2-TPR). It was found that the used fuels strongly affected the characterization and the low-temperature reduction behavior of CuO/CeO2 catalysts. The CuO/CeO2-urea catalyst exhibited higher catalytic activity toward CO oxidation (t50=120∘C, t100=159∘C) than the 5 other synthesized catalysts. In addition, the CuO/CeO2-urea catalyst displayed high stability for CO oxidation during five cycles and water resistance. The enhanced catalytic CO oxidation of the synthesized samples can be attributed by a combination of factors, such as smaller crystallite size, higher specific surface area, larger amount of amorphous copper(II) oxide, more mesoporous and uniform spherical-like structure. These findings are worth considering in order to continue the study of the CuO/CeO2 catalyst with low-temperature CO oxidation.

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