Application of boron-modified nickel catalysts on the steam reforming of ethanol

Huang, Hsin-Hua; Yu, Shen-Wei; Chuang, Chen-Lung; Wang, Chen-Bin

doi:10.1016/j.ijhydene.2014.07.033

Cited by 12 publications

(7 citation statements)

References 53 publications

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“…Above all, the interaction of ethanol with the surface of Ni forms an ethoxide by adsorption of ethanol on the shell. [64][65] Subsequently, the surface adsorbed ethoxide, to a certain extent, can dehydrogenate to acetaldehyde. Ni is known to cleave the C-C bond effectively, which can cause catalytic cracking of acetaldehyde into CH 4 and CO. 66 In addition, the SAR reaction may occur simultaneously over the Ni-based shell during the formation of acetaldehyde, increasing the production of H 2 , and is followed by the WGS reaction to convert CO into CO 2 .…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

A novel BEA-type zeolite core–shell multiple catalyst for hydrogen-rich gas production from ethanol steam reforming

Zheng

Yang

et al. 2016

Catal. Sci. Technol.

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Section: Catalysis Science and Technology Papermentioning

confidence: 99%

A novel BEA-type zeolite core–shell multiple catalyst for hydrogen-rich gas production from ethanol steam reforming

Zheng

Yang

et al. 2016

Catal. Sci. Technol.

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“…The wide medium‐high temperature peak shifted to a lower temperature (from 225 to 160 °C) upon the addition of B. Meanwhile, the ratio of the medium‐high temperature peak area and low temperature peak area decreased from 0.56 to 0.45; this indicates that the number and intensity of adsorption peaks were reduced, which might have been caused by B doping . The stronger adsorption sites make it more active on the catalytic hydrogenation of nitrobenzene.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, calculations have demonstrated that these sites probably initiate coke formation , or lead to low catalytic activity when covered by carbon atoms . Initial studies indicated that blocking by boron potentially reduced deactivation, and boron could influence the coking resistance of nickel‐based catalysts during the steam reforming of methane .…”

Section: Introductionmentioning

confidence: 99%

Anti‐Coke Properties of Acid‐Treated Bentonite‐Supported Nickel‐Boron Catalyst

Jiang

Huang

et al. 2017

Chem Eng & Technol

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Boron was introduced into nickel/acid-treated bentonite (Ni/A-Bn) catalysts to improve the anti-coking ability of the nickel-based catalyst in the hydrogenation of nitrobenzene. The results showed the B-doped Ni/A-Bn catalyst was more active than that without B. During an extended reaction period, Ni-B/acid-treated bentonite (Ni-B/A-Bn) resulted in a high nitrobenzene conversion and a high aniline selectivity. The lifetime of Ni-B/A-Bn was extended significantly compared with that of Ni/A-Bn. The addition of B into Ni/A-Bn decreased the NiO particle size, improved the dispersion of active components, and decreased carbon deposition. The combination of B and Ni prevented coke deposition on metallic Ni during nitrobenzene hydrogenation, which reduced carbon deposition on the surface of Ni-B/A-Bn. IntroductionAniline is an important chemical in industry [1,2], and is mainly produced by phenol ammonization, iron powder reduction, and catalytic hydrogenation of nitrobenzene. Among these methods, catalytic hydrogenation does not generate acid effluents and has little impact on the environment, compared with the other two methods. Catalytic hydrogenation of nitrobenzene in a gas-liquid-solid system, which is a greener method, is the main way to obtain aniline in very high yields [3][4][5]. A noble metal is commonly used in catalytic reaction due to excellent catalytic activity and higher coking resistance [6][7][8][9][10]; however, the cost is too high and limits industrial applications. As a transition metal, nickel-based catalysts exhibit high activity for hydrogenation and are low-cost compared with noblemetal-based catalysts [11]. In industry, nickel-based catalysts are generally used in the form of Raney Ni; however, this is easily deactivated by sintering. Additionally, catalyst deactivation is also caused by carbon deposition, which a general problem for hydrogenation [12,13]. Many studies of carbon chemisorption on Ni surfaces have further refined understanding of the molecular-level behavior of carbon atom deposition on Nibased catalysts [14][15][16], and it has been suggested that a small amount of boron could enhance the stability of Ni-based catalysts [15,16]. The atomic number of boron close to that of carbon, and shows similar chemisorption preferences on Ni-based catalysts; therefore, a small amount of boron might block most of the stable binding sites. Furthermore, calculations have demonstrated that these sites probably initiate coke formation [14,15] or lead to low catalytic activity when covered by carbon atoms [16]. Initial studies indicated that blocking by boron potentially reduced deactivation, and boron could influence the coking resistance of nickel-based catalysts during the steam reforming of methane [17].Bentonite is a good catalyst support due to its strong metalsupport interaction and low cost. Coking on the Ni surface is a technological problem and has been addressed in many studies [18][19][20][21][22]. Ni/bentonite was used as a catalyst for nitrobenzene hydrogenation to form aniline; ...

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“…For example, the amorphous NiÀ B alloy can selectively block the sites of coke deposition at the catalyst surface, meanwhile, B enters the lattice of oxide support can improve oxygen storage capacity, [330] both them inhibit the formation of carbon deposition to a certain extent. [288,320,333] But excessive doping from boride and borate impurities may be a cause of worsening of activity that results in a lower ethanol conversion and hydrogen yield, but higher selectivity to acetaldehyde. [333] Moreover, the doping of additional, less active elements into the active metal can also reduce the extent of metal ensemble, where the smaller particles tend to produce less coke due to the lack of sufficient platform sites.…”

Section: Strategies Aimed At Preventing Carbon Depositionmentioning

confidence: 99%

Recent Status in Catalyst Modification Strategies for Hydrogen Production from Ethanol Steam Reforming

2023

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Hydrogen as the most promising alternative energy vector to fossil stands out due to its highly energy density and zero pollution. Extending the hydrogen feedstock from hydrocarbons (e. g., methane) to biomass derived oxygen‐containing compounds (CH3OH, C2H5OH etc.) provides the opportunity for low environmental pollution as well as a promising sustainable energy economy. Recently, ethanol with less toxic and high calorific value than traditional fossil energy (coal, oil and natural gas) has garnered significant attention for ethanol steam reforming (ESR) to produce hydrogen, a key component in fuel cell cogeneration system. This paper reviews recent advances on the catalyst developing strategies including structural constitution control, oxide supports modification, surface topography control and bimetallic interactions, and further discusses the catalytic mechanisms, anti‐carbon deposition and sintering resistance strategies on the ethanol steam reforming (ESR) processes. Finally, the challenges and possible strategies for the development of high‐performance catalysts in terms of fundamental research have been discussed.

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Application of boron-modified nickel catalysts on the steam reforming of ethanol

Cited by 12 publications

References 53 publications

A novel BEA-type zeolite core–shell multiple catalyst for hydrogen-rich gas production from ethanol steam reforming

A novel BEA-type zeolite core–shell multiple catalyst for hydrogen-rich gas production from ethanol steam reforming

Anti‐Coke Properties of Acid‐Treated Bentonite‐Supported Nickel‐Boron Catalyst

Recent Status in Catalyst Modification Strategies for Hydrogen Production from Ethanol Steam Reforming

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