scholarly journals Tuning Metal–Support Interactions on Ni/Al2O3 Catalysts to Improve Catalytic Activity and Stability for Dry Reforming of Methane

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 706
Author(s):  
Lulu He ◽  
Yuanhang Ren ◽  
Bin Yue ◽  
Shik Chi Edman Tsang ◽  
Heyong He
Keyword(s):  
Calcination Temperature ◽  
Active Sites ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Impregnation Method ◽  
Nickel Aluminate ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Crystallite Sizes

Ni-based catalysts supported on alumina derived from the pseudo-boehmite prepared by the impregnation method were employed for catalytic dry reforming of methane reaction at the temperature of 550–750 °C. The effect of calcination temperature on physicochemical properties such as the Ni dispersion, reduction degree, nickel crystallite sizes, and metal–support interaction of the catalysts was investigated. The characterization results show that increasing the catalyst calcination temperature leads to the formation of nickel-alumina spinel, which enhances the metal–support interaction and increases the reduction temperature. The nickel nanoparticle size decreases and the effective dispersion increases with the increasing calcination temperature from 450 °C to 750 °C due to the formation of nickel aluminate. The catalyst calcined at 750 °C exhibits the highest CH4 and CO2 conversion owing to the small Ni0 active sites and high Ni dispersion. In a 200 h stability test in dry reforming of methane at 700 °C, the Ni/Al2O3-750 catalyst exhibits excellent catalytic stability and anti-coking ability.

scholarly journals Preparation of Vermiculite-based Ni-phyllosilicate for Dry Reforming of Methane

2020 ◽  
Vol 72 (4) ◽  
pp. 99-109
Author(s):  
Xiaofeng Zhu ◽  
Teng Zhao ◽  
Yufan Huang ◽  
Zijun Wang
Keyword(s):  
Catalytic Activity ◽  
Catalyst Support ◽  
Dry Reforming ◽  
Metal Particles ◽  
Dry Reforming Of Methane ◽  
Impregnation Method ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Strong Metal Support Interaction

Layered porous SiO2 (V-SiO2) was designed and prepared from vermiculite by expansion-acidification method, and then used as a catalyst support to prepare Ni/V-SiO2 for dry reforming of methane. It is well known that sintering and carbon deposition of metal particles are two main problems in deactivation of nickel-based catalysts for methane dry reforming. It is reported that strong metal support interaction is a possible solution. Here, a Ni/V-SiO2-H catalyst derived from Ni-phyllosilicate was developed, and compared with the catalyst Ni/V-SiO2-IM by impregnation method. The results showed that the Ni/V-SiO2-H catalyst had high catalytic activity and stability, and the CH4 conversion reached 71.7% at 700 �C. The reason is that on the one hand, the active metal particles in the catalyst are small (8.3 nm) and relatively evenly dispersed; on the other hand, the catalyst has strong metal support interaction, which improves the anti sintering ability of the catalyst and affects the catalytic activity. It is considered that V-SiO2 as a catalyst support for the preparation of Ni-phyllosilicate may have wide application.

scholarly journals Plasma Promotes Dry Reforming Reaction of CH4 and CO2 at Room Temperature with Highly Dispersed NiO/γ-Al2O3 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1433
Author(s):  
Shan-Shan Lin ◽  
Peng-Rui Li ◽  
Hui-Bo Jiang ◽  
Jian-Feng Diao ◽  
Zhong-Ning Xu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Room Temperature ◽  
Dry Reforming ◽  
Impregnation Method ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Highly Dispersed ◽  
Metal Support ◽  
Al2o3 Catalyst

Plasma is an efficient method that can activate inert molecules such as methane and carbon dioxide in a mild environment to make them reactive. In this work, we have prepared an AE-NiO/γ-Al2O3 catalyst using an ammonia-evaporation method for plasma promoted dry reforming reaction of CO2 and CH4 at room temperature. According to the characterization data of XRD, H2-TPR, TEM, XPS, etc., the AE-NiO/γ-Al2O3 catalyst has higher dispersion, smaller particle size and stronger metal-support interaction than the catalyst prepared by the traditional impregnation method. In addition, the AE-NiO/γ-Al2O3 catalyst also exhibits higher activity in dry reforming reaction. This work provides a feasible reference experience for the research of plasma promoted dry reforming reaction catalysts at room temperature.

Effects of metal support interaction on dry reforming of methane over Ni/ Ce‐Al 2 O 3 catalysts

2020 ◽  
Vol 98 (11) ◽  
pp. 2425-2434
Author(s):  
Sagir Adamu ◽  
Abdul‐Rashid Bawah ◽  
Oki Muraza ◽  
Zuhair Malaibari ◽  
Mohammad M. Hossain
Keyword(s):  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support

scholarly journals Coking-resistant dry reforming of methane over Ni/γ-Al2O3 catalysts by rationally steering metal-support interaction

iScience ◽  
2021 ◽  
pp. 102747
Author(s):  
Bo Yang ◽  
Jiang Deng ◽  
Hongrui Li ◽  
Tingting Yan ◽  
Jianping Zhang ◽  
...  
Keyword(s):  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support

Dry reforming of methane over La2O2CO3-modified Ni/Al2O3 catalysts with moderate metal support interaction

2020 ◽  
Vol 264 ◽  
pp. 118448 ◽  
Author(s):  
Kang Li ◽  
Chunlei Pei ◽  
Xinyu Li ◽  
Sai Chen ◽  
Xianhua Zhang ◽  
...  
Keyword(s):  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support

Co-processing of hydrodeoxygenation and hydrodesulfurization of phenol and dibenzothiophene with NiMo/Al2O3–ZrO2 and NiMo/TiO2–ZrO2 catalysts

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jesús Andrés Tavizón Pozos ◽  
Gerardo Chávez Esquivel ◽  
Ignacio Cervantes Arista ◽  
José Antonio de los Reyes Heredia ◽  
Víctor Alejandro Suárez Toriello
Keyword(s):  
Active Sites ◽  
Reaction Rate ◽  
Supported Catalysts ◽  
Initial Reaction Rate ◽  
Initial Reaction ◽  
Competition Effect ◽  
Support Interaction ◽  
Highly Active ◽  
Metal Support Interaction ◽  
Metal Support

Abstract The influence of Al2O3–ZrO2 and TiO2–ZrO2 supports on NiMo-supported catalysts at a different sulfur concentration in a model hydrodeoxygenation (HDO)-hydrodesulfurization (HDS) co-processing reaction has been studied in this work. A competition effect between phenol and dibenzothiophene (DBT) for active sites was evidenced. The competence for the active sites between phenol and DBT was measured by comparison of the initial reaction rate and selectivity at two sulfur concentrations (200 and 500 ppm S). NiMo/TiO2–ZrO2 was almost four-fold more active in phenol HDO co-processed with DBT than NiMo/Al2O3–ZrO2 catalyst. Consequently, more labile active sites are present on NiMo/TiO2–ZrO2 than in NiMo/Al2O3–ZrO2 confirmed by the decrease in co-processing competition for the active sites between phenol and DBT. DBT molecules react at hydrogenolysis sites (edge and rim) preferentially so that phenol reacts at hydrogenation sites (edge and edge). However, the hydrogenated capacity would be lost when the sulfur content was increased. In general, both catalysts showed similar functionalities but different degrees of competition according to the highly active NiMoS phase availability. TiO2–ZrO2 as the support provided weaker metal-support interaction than Al2O3–ZrO2, generating a larger fraction of easily reducible octahedrally coordinated Mo- and Ni-oxide species, causing that NiMo/TiO2–ZrO2 generated precursors of MoS2 crystallites with a longer length and stacking but with a higher degree of Ni-promotion than NiMo/Al2O3–ZrO2 catalyst.

scholarly journals The effect of interfacial engineering on the deactivation resistance of nickel-based catalysts for dry reforming of methane

2021 ◽  
Vol 2076 (1) ◽  
pp. 012041
Author(s):  
Jinmiao Zhang ◽  
Mudi Zheng ◽  
Yuqing Zhou ◽  
Xingyuan Gao
Keyword(s):  
Catalytic Activity ◽  
Low Cost ◽  
Chemical Properties ◽  
Dry Reforming ◽  
Sulfur Poisoning ◽  
Dry Reforming Of Methane ◽  
Interfacial Engineering ◽  
Metal Support Interaction ◽  
Metal Metal ◽  
Metal Support

Abstract Methane dry reforming reaction (DRM) can convert CO2 and CH4, two kinds of greenhouse gases with very stable chemical properties, to produce syngas, which can be used to synthesize valuable industrial products. Nickel-based catalysts have been widely used in DRM because of their low cost and good catalytic activity. However, nickel application is limited by such as high-temperature metal sintering, carbon deposition and catalyst poisoning, which restricts the industrial application in DRM reaction. Compared with single metal nickel, the selective doping of multi metals and supports shows higher catalytic activity and anti poisoning tolerance due to changing the chemical and structural properties of the catalyst by enhancing the alloy effect and the force between metal and support. This paper mainly reviews the catalysts with anti-coking, anti-sintering and anti-sulfur poisoning by tuning the metal-metal interaction and metal-support interaction (MSI) in DRM. The modification strategies in interfacial engineering and structure-performance relationship are discussed, and the existing difficulties and future development of Ni-based catalysts are proposed.

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