Transition metal nanoparticles dispersed in an alumina matrix as active and stable catalysts for COx-free hydrogen production from ammonia

2015 ◽  
Vol 3 (33) ◽  
pp. 17172-17180 ◽  
Author(s):  
Ying-Qiu Gu ◽  
Zhao Jin ◽  
Hu Zhang ◽  
Rong-Jie Xu ◽  
Ming-Jiang Zheng ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Ni Nanoparticles ◽  
Alumina Matrix ◽  
Transition Metal Nanoparticles ◽  
Free Hydrogen ◽  
Co Precipitation ◽  
Excellent Catalytic Performance

Transition metal (Fe, Co, and Ni) nanoparticles dispersed in an alumina matrix were synthesized by a facile co-precipitation method and showed excellent catalytic performance for NH3 decomposition.

COx-free hydrogen production via ammonia decomposition over mesoporous Co/Al2O3 catalysts with highly dispersed Co species synthesized by a facile method

2021 ◽  
Author(s):  
Yingqiu Gu ◽  
Di Xu ◽  
Yun Huang ◽  
Zhouyang Long ◽  
Guojian Chen
Keyword(s):  
Fuel Cells ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Transition Metals ◽  
Ammonia Decomposition ◽  
Metal Catalyst ◽  
Facile Synthesis ◽  
Transition Metal Catalyst ◽  
Highly Dispersed ◽  
Free Hydrogen

Transition metals have been considered as potential catalysts for ammonia decomposition to produce COx-free hydrogen for fuel cells. However, the facile synthesis of transition metal catalyst with small size active...

Effect of Fe and Co promoters on CO methanation activity of nickel catalyst prepared by impregnation – co-precipitation method

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Buyan-Ulzii Battulga ◽  
Tungalagtamir Bold ◽  
Enkhsaruul Byambajav
Keyword(s):  
Synergetic Effect ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Alumina Support ◽  
Co Methanation ◽  
Temperature Range ◽  
Co Precipitation ◽  
Catalyst Distribution

AbstractNi based catalysts supported on γ-Al2O3 that was unpromoted (Ni/γAl2O3) or promoted (Ni–Fe/γAl2O3, Ni–Co/γAl2O3, and Ni–Fe–Co/γAl2O3) were prepared using by the impregnation – co-precipitation method. Their catalytic performances for CO methanation were studied at 3 atm with a weight hourly space velocity (WHSV) of 3000 ml/g/h of syngas with a molar ratio of H2/CO = 3 and in the temperature range between 130 and 350 °C. All promoters could improve nickel distribution, and decreased its particle sizes. It was found that the Ni–Co/γAl2O3 catalyst showed the highest catalytic performance for CO methanation in a low temperature range (<250 °C). The temperatures for the 20% CO conversion over Ni–Co/γAl2O3, Ni–Fe/γAl2O3, Ni–Fe–Co/γAl2O3 and Ni/γAl2O3 catalysts were 205, 253, 263 and 270 °C, respectively. The improved catalyst distribution by the addition of cobalt promoter caused the formation of β type nickel species which had an appropriate interacting strength with alumina support in the Ni–Co/γAl2O3. Though an addition of iron promoter improved catalyst distribution, the methane selectivity was lowered due to acceleration of both CO methanation and WGS reaction with the Ni–Fe/γAl2O3. Moreover, it was found that there was no synergetic effect from the binary Fe–Co promotors in the Ni–Fe–Co/γAl2O3 on catalytic activity for CO methanation.

Effective synthesis of zeolite-encapsulated Ni nanoparticles with excellent catalytic performance for hydrogenation of CO2 to CH4

2020 ◽  
Vol 49 (42) ◽  
pp. 14771-14775
Author(s):  
Zhiyang Zhang ◽  
Qingbo Xiao ◽  
Jing Gu
Keyword(s):  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Deposition Method ◽  
Hydrogenation Of Co2 ◽  
X Zeolite ◽  
Effective Synthesis ◽  
Excellent Catalytic Performance ◽  
Hydrogenation Of Co

X-zeolite encapsulated uniformly Ni nanoparticles (Ni@NaX) were prepared by applying a simple and effective “synchronous exchange deposition” method and showed excellent ability to catalyze the hydrogenation of CO2 to CH4.

Multimetal-MOF-derived transition metal alloy NPs embedded in an N-doped carbon matrix: highly active catalysts for hydrogenation reactions

2016 ◽  
Vol 4 (26) ◽  
pp. 10254-10262 ◽  
Author(s):  
Jilan Long ◽  
Kui Shen ◽  
Liang Chen ◽  
Yingwei Li
Keyword(s):  
Transition Metal ◽  
Carbon Matrix ◽  
Catalytic Performance ◽  
Metal Alloy ◽  
Transfer Hydrogenation ◽  
Transition Metal Alloy ◽  
Highly Active ◽  
Hydrogenation Reactions ◽  
Excellent Catalytic Performance ◽  
Hydrogenation Of Nitriles

We report a MOF-templated route to synthesize transition metal alloy NPs embedded in an N-doped carbon matrix. The alloy-based catalysts exhibited excellent catalytic performance and widespread substrate applicability for the transfer hydrogenation of nitriles.

Photocatalytic Activity of Zeolite Supported Transition Metal-(Co2+ and Cr2+) Doped ZnO: Comparative Study

2015 ◽  
Vol 827 ◽  
pp. 43-48
Author(s):  
Annisa Noorhidayati ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Transition Metal ◽  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Transition Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

Transition metal ions (Co and Cr) doped ZnO nanoparticles supported on natural zeolite were synthesized using co-precipitation method. The synthesized samples were characterized by means of X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and UV-visible diffuse reflectance spectroscopy. The samples were further used as photocatalyst for degradation of methyl orange and methylene blue in aqueous solutions under UV light irradiation. The results showed that zeolite supported Cr-doped ZnO nanoparticles is more efficient compared with zeolite supported Co-doped ZnO nanoparticles. It is also revealed that zeolite supported samples possessed higher photocatalytic efficiency compared to bare samples.

scholarly journals Effect of Y Modified Ceria Support in Mono and Bimetallic Pd–Au Catalysts for Complete Benzene Oxidation

Catalysts ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 283 ◽  
Author(s):  
Lyuba Ilieva ◽  
Anna Venezia ◽  
Petya Petrova ◽  
Giuseppe Pantaleo ◽  
Leonarda Liotta ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Benzene Oxidation ◽  
Total Oxidation ◽  
Pd Catalysts ◽  
X Ray ◽  
Close Relationship ◽  
Ceria Support ◽  
Co Precipitation

Mono metallic and bimetallic Pd (1 wt. %)–Au (3 wt. %) catalysts were prepared using two ceria supports doped with 1 wt. % Y2O3. Yttrium was added by impregnation or co-precipitation. The catalyst synthesis was carried out by deposition–precipitation method, with sequential deposition–precipitation of palladium over previously loaded gold in the case of the bimetallic samples. The obtained materials, characterized by X-ray powder diffraction (XRD), High resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (TPR) techniques, were tested in the complete benzene oxidation (CBO). The results of the characterization analyses and the catalytic performance pointed to a close relationship between structural, redox, and catalytic properties of mono and bimetallic catalysts. Among the monometallic systems, Pd catalysts were more active as compared to the corresponding Au catalysts. The bimetallic systems exhibited the best combustion activity. In particular, over Pd–Au supported on Y-impregnated ceria, 100% of benzene conversion towards total oxidation at the temperature of 150 °C was obtained. Comparison of surface sensitive XPS results of fresh and spent catalysts ascertained the redox character of the reaction.

scholarly journals Synthesis of DME by CO2 hydrogenation over La2O3-modified CuO-ZnO-ZrO2/HZSM-5 catalysts

2017 ◽  
Vol 23 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Yajing Zhang ◽  
Yu Zhang ◽  
Fu Ding ◽  
Kangjun Wang ◽  
Wang Xiaolei ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Direct Synthesis ◽  
Catalytic Performance ◽  
Co2 Hydrogenation ◽  
Precipitation Method ◽  
X Ray ◽  
Temperature Programmed ◽  
And Performance ◽  
Co Precipitation ◽  
Adsorption Desorption

A series of La2O3-modified CuO-ZnO-ZrO2/HZSM-5 catalysts were prepared by an oxalate co-precipitation method. The catalysts were fully characterized by X-ray diffraction (XRD), N2 adsorption-desorption, hydrogen temperature pro-grammed reduction (H2-TPR), ammonia temperature programmed desorption (NH3-TPD), and X-ray photoelectron spectroscopy (XPS) techniques. The effect of the La2O3 content on the structure and performance of the catalysts was thoroughly investigated. The catalysts were evaluated for the direct synthesis of dimethyl ether (DME) from CO2 hydrogenation. The results displayed that La2O3 addition enhanced catalytic performance, and the maximal CO2 conversion (34.3%) and DME selectivity (57.3%) were obtained over the catalyst with 1% La2O3, which due to the smaller size of Cu species and a larger ratio of Cu+/Cu.

Enhancing the catalytic performance of cobalt oxide by doping on ceria in the high temperature water–gas shift reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103023-103029 ◽  
Author(s):  
Ajay Jha ◽  
Dae-Woon Jeong ◽  
Yeol-Lim Lee ◽  
In Wook Nah ◽  
Hyun-Seog Roh
Keyword(s):  
High Temperature ◽  
Catalytic Performance ◽  
Water Gas Shift ◽  
Precipitation Method ◽  
High Temperature Water ◽  
Wgs Reaction ◽  
Co Precipitation ◽  
Shift Reaction ◽  
Water Gas ◽  
Temperature Water

The high temperature water–gas shift (HT-WGS) reaction was performed using a Co–CeO2 catalyst, prepared through a co-precipitation method.

Nanoparticles of Cu–Co alloy derived from layered double hydroxides and their catalytic performance for higher alcohol synthesis from syngas

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58804-58812 ◽  
Author(s):  
Ang Cao ◽  
Guilong Liu ◽  
Yizhi Yue ◽  
Lihong Zhang ◽  
Yuan Liu
Keyword(s):  
Layered Double Hydroxides ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Higher Alcohol Synthesis ◽  
Higher Alcohol ◽  
Alcohol Synthesis ◽  
Co Precipitation ◽  
Double Hydroxides

A series of layered double hydroxides (LDHs) with different Cu/Co ratios were prepared according to the co-precipitation method and used as catalyst precursors for higher alcohol synthesis.

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