A highly stable and active mesoporous ruthenium catalyst for ammonia synthesis prepared by a RuCl3/SiO2-templated approach

Zhou, Yaping; Ma, Yongcheng; Lan, Guojun; Tang, Haodong; Han, Wenfeng; Liu, Huazhang; Li, Ying

doi:10.1016/s1872-2067(18)63192-4

Cited by 27 publications

(8 citation statements)

References 30 publications

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“…Commercial Ru/activated carbon catalysts in industry are promising due to the uniform dispersion of Ru NPs and the superior of electronic properties. Zhou et al synthesized Ru NPs of 1.5–2.5 nm semiembedded in mesoporous carbon (Ba–K/Ru–MC), which showed about 150 mmol g –1 h –1 of ammonia production under 425 °C. However, the methanation of carbon supports during the reaction leads to the metal sintering and then the loss of active B5 sites .…”

Section: Ammonia Synthesis Over Ru-based Catalystsmentioning

confidence: 99%

Challenges and Opportunities of Ru-Based Catalysts toward the Synthesis and Utilization of Ammonia

et al. 2022

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Ammonia is an important chemical for synthesized fertilizers traditionally and for a potential energy vector increasingly. Industrial ammonia synthesis through the Haber–Bosch process is energy-intensive and requires advanced materials to catalyze ammonia synthesis under mild conditions, whereas the utilization of ammonia as a hydrogen carrier via ammonia decomposition is facing a similar situation as well. The developed second-generation Ru-based catalysts performs superior activities over commercial Fe- or Ni-based catalysts; however, it remains challenging to construct effective Ru catalysts to achieve the usage of Ru metal affordably as well as further understanding the nature of Ru catalysis. This Perspective summarizes the recent contributions in engineering Ru-based catalysts via various strategies and related catalysis in ammonia synthesis and decomposition, and it discusses the similarities and differences of Ru catalysis in these reactions. Finally, an overview of this area and opportunities for further investigation are also provided.

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Section: Ammonia Synthesis Over Ru-based Catalystsmentioning

confidence: 99%

Challenges and Opportunities of Ru-Based Catalysts toward the Synthesis and Utilization of Ammonia

et al. 2022

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“…The color map shows the space velocity (mL g cat –1 h –1 ). Data are reproduced from the following references: , , − , , − , , − , − , and a table is provided (Table S5) listing the information on the catalysts in Section S3 of the Supporting Information.…”

Section: Better Thermocatalysts For Lower Temperaturementioning

confidence: 99%

Perspective on Intensification of Haber−Bosch to Enable Ammonia Production under Milder Conditions

Lin

Nowrin

Rosenthal

et al. 2023

ACS Sustainable Chem. Eng.

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Ammonia is one of the most widely produced chemicals in the world. It is synthesized by reacting hydrogen and nitrogen gases at high temperature and high pressure. Over 180 million metric tonnes of ammonia produced annually accounts for 1%−2% of all global greenhouse gas (GHG) emissions, mainly due to the production of hydrogen via fossil fuel feedstocks. As such, making this process cheaper, more efficient, and less energy intensive has been a major focus of research for scientists and engineers throughout the past century. Modern research on ammonia production largely focuses on decarbonizing this process through a myriad of techniques, such as improving energy efficiency via intensification or electrification. This perspective provides insights into the progress made toward the intensification of thermocatalytic processes for ammonia synthesis under milder conditions, including alternative ammonia separation methods and better catalysts. We first review ammonia separation methods that can enable the transition from high-pressure to low-pressure ammonia manufacturing, including ammonia-selective membranes and sorbents. The performance of membranes for ammonia separation is discussed in terms of ammonia selectivity and permeance for a wide range of temperatures, with the focus on the strengths and limitations of both organic and inorganic materials. Recently developed sorbents that selectively uptake ammonia from gas mixtures are also discussed, with a special emphasis on the performance of absorbents at various experimental conditions. Since one of the potential prospects for decarbonizing ammonia synthesis lies in creating a catalyst that can operate at a lower temperature, catalytic materials that have been reported in the last two decades and can sustain production rates at temperatures below 400 °C are reviewed.

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“…For supported heterogeneous catalysts, alkali metal components are typically introduced as promoters to increase the amount of adsorption sites and mediate the adsorption strength of the reactants and intermediates on the “inert support” (Li et al, 1998 ; Gálvez et al, 2013 ; Obalová et al, 2013 ; Connor and Holland, 2017 ; Pacultová et al, 2017 ). For instance, the addition of alkali metal promoters is crucial for industrial catalysts substantially applied in the Fisher-Tropsch synthesis (Mirzaei et al, 2006 ; Okabe et al, 2007 ; Feyzi et al, 2011 ; Cosultchi et al, 2012 ) and ammonia synthesis (Shimoda et al, 2017 ; Lin et al, 2018a ; Jafari et al, 2019 ; Rogowski, 2019 ; Zhou et al, 2019 ). In the field of RWGSRs, abundant studies have shown that K and other promoter additives are essential for some supported catalysts to acquire the expected CO product (Arunajatesan et al, 2007 ).…”

Section: Catalytic Systemmentioning

confidence: 99%

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

et al. 2020

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The reverse water-gas shift reaction (RWGSR), a crucial stage in the conversion of abundant CO 2 into chemicals or hydrocarbon fuels, has attracted extensive attention as a renewable system to synthesize fuels by non-traditional routes. There have been persistent efforts to synthesize catalysts for industrial applications, with attention given to the catalytic activity, CO selectivity, and thermal stability. In this review, we describe the thermodynamics, kinetics, and atomic-level mechanisms of the RWGSR in relation to efficient RWGSR catalysts consisting of supported catalysts and oxide catalysts. In addition, we rationally classify, summarize, and analyze the effects of physicochemical properties, such as the morphologies, compositions, promoting abilities, and presence of strong metal-support interactions (SMSI), on the catalytic performance and CO selectivity in the RWGSR over supported catalysts. Regarding oxide catalysts (i.e., pure oxides, spinel, solid solution, and perovskite-type oxides), we emphasize the relationships among their surface structure, oxygen storage capacity (OSC), and catalytic performance in the RWGSR. Furthermore, the abilities of perovskite-type oxides to enhance the RWGSR with chemical looping cycles (RWGSR-CL) are systematically illustrated. These systematic introductions shed light on development of catalysts with high performance in RWGSR.

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A highly stable and active mesoporous ruthenium catalyst for ammonia synthesis prepared by a RuCl3/SiO2-templated approach

Cited by 27 publications

References 30 publications

Challenges and Opportunities of Ru-Based Catalysts toward the Synthesis and Utilization of Ammonia

Challenges and Opportunities of Ru-Based Catalysts toward the Synthesis and Utilization of Ammonia

Perspective on Intensification of Haber−Bosch to Enable Ammonia Production under Milder Conditions

Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

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