scholarly journals Influence of Ni Precursors on the Structure, Performance, and Carbon Deposition of Ni-Al2O3 Catalysts for CO Methanation

ACS Omega ◽  
2021 ◽  
Author(s):  
Wenlong Mo ◽  
Xingxiang Wang ◽  
Meng Zou ◽  
Xianjin Huang ◽  
Fengyun Ma ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Co Methanation

Impact of mesoporous structure of acid-treated clay on nickel dispersion and carbon deposition for CO methanation

2014 ◽  
Vol 39 (7) ◽  
pp. 3231-3242 ◽  
Author(s):  
Xuzhuang Yang ◽  
Wendurima ◽  
Guanjun Gao ◽  
Quanquan Shi ◽  
Xin Wang ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Mesoporous Structure ◽  
Co Methanation ◽  
Nickel Dispersion

Mechanism studies concerning carbon deposition effect of CO methanation on Ni-based catalyst through DFT and TPSR methods

2016 ◽  
Vol 41 (20) ◽  
pp. 8401-8411 ◽  
Author(s):  
Xiaoxia Han ◽  
Jinzhou Yang ◽  
Hailong Guo ◽  
Zhifeng Qin ◽  
Shuyan Zhao ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Co Methanation ◽  
Deposition Effect

Nanoparticles of Ni-Co Alloy Derived from Layered Double Hydroxides and Their Catalytic Performance for CO Methanation

NANO ◽  
2016 ◽  
Vol 11 (10) ◽  
pp. 1650118 ◽  
Author(s):  
Jingge Liu ◽  
Ang Cao ◽  
Jing Si ◽  
Lihong Zhang ◽  
Qinglan Hao ◽  
...  
Keyword(s):  
Metallic Nanoparticles ◽  
Carbon Deposition ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
Co Methanation ◽  
Transmission Electron ◽  
Temperature Programmed ◽  
The Stability ◽  
Double Hydroxides ◽  
Adsorption Desorption

Sintering of the active metallic nanoparticles and carbon deposition are the key problems faced for CO methanation catalysts. For overcoming those problems, bimetallic nanocatalyst is a promising route. In this work, a series of Al2O3 supported Ni-Co alloy catalysts were prepared by reducing NiCoAl layered double hydrotalcite (LDHs), and characterized with X-ray diffraction (XRD), temperature programmed reduction TPR, N2 adsorption-desorption, transmission electron microscopy (TEM) and temperature programed oxidation (TPO) techniques. The resultant catalysts were mesoporous with nanoparticles of Ni-Co alloy ranging from 7.9[Formula: see text]nm to 9.2[Formula: see text]nm which were highly dispersed in alumina matrix. The sample Ni7Co3-Al2O3 catalysts showed very good catalytic performance during the stability test at 500/600[Formula: see text]C for 300[Formula: see text]h, meanwhile exhibited excellent anti-sintering ability and anti-carbon deposition ability, owing to the formation of Ni-Co alloy and the feature of LDHs. This strategy for improving anti-sintering and anti-carbon deposition should be extendable for catalysts of other reactions.

CO activation and methanation mechanism on hexagonal close-packed Co catalysts: effect of functionals, carbon deposition and surface structure

2020 ◽  
Vol 10 (10) ◽  
pp. 3387-3398
Author(s):  
Hai-Yan Su ◽  
Changlin Yu ◽  
Jin-Xun Liu ◽  
Yonghui Zhao ◽  
Xiufang Ma ◽  
...  
Keyword(s):  
Surface Structure ◽  
Carbon Deposition ◽  
Graphitic Carbon ◽  
Co Methanation ◽  
Co Catalysts ◽  
Hexagonal Close Packed ◽  
Co Activation

Regardless of the functionals used and the presence of graphitic carbon, the CO methanation rate on Co(0001) is mainly controlled by CHO decomposition.

Ni nanoparticles highly dispersed on ZrO2 and modified with La2O3 for CO methanation

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12699-12707 ◽  
Author(s):  
Jing Si ◽  
Guilong Liu ◽  
Jingge Liu ◽  
Lin Zhao ◽  
Shuangshuang Li ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Ni Nanoparticles ◽  
Co Methanation ◽  
Highly Dispersed ◽  
Nano Catalysts

To improve the anti-sintering and anti-carbon deposition ability of the supported metallic nano catalysts, a new scheme for designing and preparing catalysts for CO methanation is presented in this work.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Elemental carbon deposition to Svalbard snow from Norwegian settlements and long-range transport

Tellus B ◽  
2011 ◽  
Vol 63 (3) ◽  
Author(s):  
Borgar Aamaas ◽  
Carl Egede Bøggild ◽  
Frode Stordal ◽  
Terje Berntsen ◽  
Kim Holmén ◽  
...  
Keyword(s):  
Long Range ◽  
Elemental Carbon ◽  
Carbon Deposition ◽  
Long Range Transport ◽  
Range Transport

Kinetics of carbon monoxide methanation on a Ni/SiO2 catalyst

1990 ◽  
Vol 55 (7) ◽  
pp. 1678-1685
Author(s):  
Vladimír Stuchlý ◽  
Karel Klusáček
Keyword(s):  
Carbon Monoxide ◽  
Reaction Rate ◽  
Catalyst Activity ◽  
Adsorbed Hydrogen ◽  
Reaction Products ◽  
Co Methanation ◽  
Molar Ratios ◽  
Rate Determining Step ◽  
Higher Temperature ◽  
Kinetics Of

Kinetics of CO methanation on a commercial Ni/SiO2 catalyst was evaluated at atmospheric pressure, between 528 and 550 K and for hydrogen to carbon monoxide molar ratios ranging from 3 : 1 to 200 : 1. The effect of reaction products on the reaction rate was also examined. Below 550 K, only methane was selectively formed. Above this temperature, the formation of carbon dioxide was also observed. The experimental data could be described by two modified Langmuir-Hinshelwood kinetic models, based on hydrogenation of surface CO by molecularly or by dissociatively adsorbed hydrogen in the rate-determining step. Water reversibly lowered catalyst activity and its effect was more pronounced at higher temperature.

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