Non-thermal plasma-treated gold catalyst for CO oxidation

RSC Advances ◽  
2014 ◽  
Vol 4 (49) ◽  
pp. 25729-25735 ◽  
Author(s):  
Huiyuan Xu ◽  
Jingjie Luo ◽  
Wei Chu
Keyword(s):  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Thermal Plasma ◽  
Gold Catalyst ◽  
Catalytic Performance ◽  
Redox Properties ◽  
Oxygen Atmosphere ◽  
Non Thermal Plasma

Plasma under oxygen atmosphere is available for promoting the microporosity, redox properties, and the catalytic performance of gold nanoparticles.

Room-temperature cataluminescence from CO oxidation in a non-thermal plasma-assisted catalysis system

2015 ◽  
Vol 293 ◽  
pp. 1-6 ◽  
Author(s):  
Feifei Han ◽  
Yuhan Yang ◽  
Jiaying Han ◽  
Jin Ouyang ◽  
Na Na
Keyword(s):  
Co Oxidation ◽  
Thermal Plasma ◽  
Room Temperature ◽  
Non Thermal Plasma

Plasma-Treated Ce/TiO2-Palygorskite Catalyst for the NH3-SCR of NOx

2019 ◽  
Vol 41 (1) ◽  
pp. 90-90
Author(s):  
Kaige Chen Kaige Chen ◽  
Ruoyu Chen Ruoyu Chen ◽  
Zhe Tang Zhe Tang ◽  
Hui Cang Hui Cang ◽  
Qi Xu Qi Xu
Keyword(s):  
Thermal Plasma ◽  
Active Sites ◽  
Alkali Metals ◽  
Performance Test ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Efficient Catalyst ◽  
Nh3 Scr ◽  
Chemisorbed Oxygen ◽  
Non Thermal Plasma

Ce/TiO2-Palygorskite ternary composites were fabricated as an efficient catalyst for medium and low temperature NH3-SCR reaction and the optimal mass proportion (Ti:Pal=1:3) of this catalyst was confirmed by the catalytic performance test, in order to improve the surface dispersion , which needed to be further disposed by the Non-thermal plasma , after that, it was activated by thermal treatment at 400⁰C for 4 h. Based on the results obtained by XRD, FE-SEM, TEM, NH3-TPD, UV-vis (DRS), XPS, the treatment of plasma was much essential for the transformation from Ce4+ to Ce3+ on the surface of Ce/TiO2-palygorskite, to increase surface chemisorbed oxygen, and the improved dispersion, which were highly favorable for denitration. At about 350⁰C, the best NO conversion was respectively 90.59 % and 96.78 % for the untreated and treated catalysts, the latter possessed higher N2 selectivity. Besides, according to the research results on alkali metals poisoning resistance of these catalysts, it was discovered, the treated-catalyst poisoned by sodium salt had the best resistance performance, which might be related with the modification of the Non-thermal plasma, leading to more dispersed surface acid sites, to get more active sites, meanwhile, the toxicity of K was stronger than Na.

scholarly journals Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 742 ◽  
Author(s):  
Jingsen Zhang ◽  
Lanbo Di ◽  
Feng Yu ◽  
Dongzhi Duan ◽  
Xiuling Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Diffuse Reflectance Spectroscopy ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
High Concentration ◽  
Oxidation Activity ◽  
X Ray

Commercial TiO2 (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O2P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H2P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H2P is ascribed to the lower concentration of [O]s species. 100% CO conversion temperatures for Au/P25-O2P is 40 °C, which is 30 °C lower than that over the as-prepared Au/P25-As catalyst. The excellent CO oxidation activity over Au/P25-O2P is mainly attributed to the efficient decomposition of gold precursor species, small size of gold nanoparticles, and the high concentration of [O]s species.

scholarly journals Improved Catalytic Performance of Au/α-Fe2O3-Like-Worm Catalyst for Low Temperature CO Oxidation

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1118 ◽  
Author(s):  
Qiuwan Han ◽  
Dongyang Zhang ◽  
Jiuli Guo ◽  
Baolin Zhu ◽  
Weiping Huang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Oxidation Reaction ◽  
Active Sites ◽  
Catalytic Performance ◽  
Photoelectron Spectra ◽  
Great Activity ◽  
X Ray ◽  
Co Oxidation Reaction

The gold catalysts supported on various morphologies of α-Fe2O3 in carbon monoxide (CO) oxidation reaction have been studied for many researchers. However, how to improve the catalytic activity and thermal stability for CO oxidation is still important. In this work, an unusual morphology of α-Fe2O3 was prepared by hydrothermal method and gold nanoparticles were supported using a deposition-precipitation method. Au/α-Fe2O3 catalyst exhibited great activity for CO oxidation. The crystal structure and microstructure images of α-Fe2O3 were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the size of gold nanoparticles was determined by transmission electron microscopy (TEM). X-ray photoelectron spectra (XPS) and Fourier transform infrared spectra (FTIR) results confirmed that the state of gold was metallic. The 1.86% Au/α-Fe2O3 catalyst calcined at 300 °C had the best catalytic performance for CO oxidation reaction and the mechanism for CO oxidation reaction was also discussed. It is highly likely that the small size of gold nanoparticle, oxygen vacancies and active sites played the decisive roles in CO oxidation reaction.

scholarly journals Gold Nanoparticles Supported on Urchin-Like CuO: Synthesis, Characterization, and Their Catalytic Performance for CO Oxidation

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 67 ◽  
Author(s):  
Feng Dong ◽  
Yuan Guo ◽  
Dongyang Zhang ◽  
Baolin Zhu ◽  
Weiping Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Co Oxidation ◽  
Solution Method ◽  
Catalytic Mechanism ◽  
Gold Catalysts ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Metallic State ◽  
Reaction Cycles ◽  
Cuo Microspheres

Gold catalysts have been studied in-depth due to their unique activities for catalytic CO oxidation. Supports have intrinsic motivation for the high activity of gold catalysts. Thermally stable urchin-like CuO microspheres, which are potential support for gold catalysts, were prepared by facile solution-method. Then gold nanoparticles were loaded on them by deposition-precipitation method. The obtained gold catalysts were characterized by SEM, XRD, TEM, BET, ICP, and XPS. Their catalytic activity for CO oxidation was also evaluated. TEM results revealed that the gold nanoparticles with small sizes were highly distributed on the CuO surface in Au1.0/CuO-300. XPS observations demonstrated that the gold species in Au1.0/CuO-300 was of metallic state. Among the as-prepared catalysts, the Au1.0/CuO-300 catalyst displayed the best performance for CO oxidation and achieved 100% CO oxidation at 80 °C. It kept 100% conversion for 20 h at a reaction temperature of 180 °C, and showed good reusability after three reaction-cycles. The possible catalytic mechanism of Au1.0/CuO-300 catalyst for CO oxidation was also briefly proposed.

scholarly journals Selective Catalytic Reduction of NO by NH3 Using a Combination of Non-Thermal Plasma and Mn-Cu/ZSM5 Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1044
Author(s):  
Tao Zhu ◽  
Xing Zhang ◽  
Wenfeng Niu ◽  
Yatao Liu ◽  
Bo Yuan ◽  
...  
Keyword(s):  
Energy Density ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Removal Efficiency ◽  
Thermal Plasma ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
High Energy ◽  
No Removal ◽  
Non Thermal Plasma

Dielectric barrier discharge (DBD) could generate non-thermal plasma (NTP) with the advantage of fast reactivity and high energy under atmosphere pressure and low-temperature. The presented work investigated the selective catalytic reduction (SCR) of nitric oxide (NO) using a combination of NTP and an Mn-Cu/ZSM5 catalyst with ammonia (NH3) as a reductant. The experimental results illustrate that the plasma-assisted SCR process enhances the low-temperature catalytic performance of the Mn-Cu/ZSM5 catalyst significantly, and it exhibits an obvious improvement in the NO removal efficiency. The reaction temperature is maintained at 200 °C in order to simulate the exhaust temperature of diesel engine, and the 10% Mn-8% Cu/ZSM5 catalyst shows the highest NO removal performance with about 93.89% at an energy density of 500 J L−1 and the selectivity to N2 is almost 99%. The voltage, frequency and energy density have a positive correlation to NO removal efficiency, which is positively correlated with the power of NTP system. In contrast, the O2 concentration has a negative correlation to the NO removal, and the NO removal efficiency cannot be improved when the NO removal process reaches reaction equilibrium in the NTP system.

scholarly journals Data on combination effect of PEG-coated gold nanoparticles and non-thermal plasma inhibit growth of solid tumors

Data in Brief ◽  
2016 ◽  
Vol 9 ◽  
pp. 318-323 ◽  
Author(s):  
Nagendra Kumar Kaushik ◽  
Neha Kaushik ◽  
Ki Chun Yoo ◽  
Nizam Uddin ◽  
Ju Sung Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Solid Tumors ◽  
Thermal Plasma ◽  
Combination Effect ◽  
Non Thermal Plasma
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