Synthesis of modified char-supported Ni–Fe catalyst with hierarchical structure for catalytic cracking of biomass tar

Lin, Qunqing; Zhang, Shuping; Wang, Jiaxing; Yin, Haoxin

doi:10.1016/j.renene.2021.04.084

Cited by 44 publications

(4 citation statements)

References 53 publications

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“…A moderate amount of nickel doping did not lead to extensive agglomerative sintering of the catalyst particles. In contrast, lattice distortion increased the strength of the basic sites and produced more oxygen vacancies, resulting in a marked increase in catalyst activity [25,[33][34][35].…”

Section: Nitrogen Adsorption-desorption Analysismentioning

confidence: 99%

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

et al. 2023

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The unique structure and physical properties of perovskite-type catalysts make them highly promising for catalyzing efficient coal combustion. Mesoporous perovskite LaNixFe1−xO3 (x = 0.2, 0.4, 0.6, 0.8) coal combustion catalysts were synthesized using the sol–gel method. The effects of the doping amount of B-site doped nickel on both the crystal structure and catalytic performance were investigated. X-ray diffraction, scanning electron microscopy, and nitrogen adsorption–desorption tests were used to characterize the catalyst samples. Thermogravimetric analysis (TG) and activation energy (Ea) calculations were used to assess the catalyst’s activity for the catalytic combustion of anthracite coal (JF coal, originating from Shanxi, China). Results revealed that nickel doping created lattice distortion and Ni-Fe alloy interactions. The difference in nickel doping significantly affects the morphology and catalytic activity of perovskite. The addition of LaNi0.6Fe0.4O3 (NI6) with a mass fraction of 5% resulted in the highest average burning rate value (va = 4.52%/min) of JF coal among all synthesized catalysts. The Ea of JF coal catalytic combustion, calculated using the Coats–Redfern method and the Doyle method, showed a good agreement with the TG curves. The LaNixFe1-xO3 series catalysts were found to significantly decrease the Ea of JF coal combustion, with a maximum reduction of 42% compared to the case without any catalyst added. Among the synthesized catalysts, NI6 exhibited a favorable catalytic combustion performance and is thus a promising candidate for the clean and efficient utilization of coal resources.

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Section: Nitrogen Adsorption-desorption Analysismentioning

confidence: 99%

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

et al. 2023

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“…Table lists examples of modifying metal and solid acid catalysts to suppress coke formation in biomass conversion reactions. For instance, there have been several strategies proposed to increase the stability of supported metal catalysts, especially Ni catalysts, for biomass gasification, including adding metal oxides (for example, MgO, CeO 2 , , and MnO x , ) or noble metals (for example, Ru and Ir), alloying the active metal with other transition metals (for example, Pt, Fe, Co), choosing suitable supports (for example, CeO 2 , MgO, , and carbon-based support − ), and modifying the pore structure of support materials. , In general, it is proposed that the improved coke resistance is due to (1) the synergetic interaction between Ni and the dopants, which generates active oxygen species to facilitate the gasification of coke, ,,, (2) the decreased acidity, which reduce the coke formation rate, , and (3) the improved gas diffusion, which facilitates the removal of products to avoid secondary coking reactions. , …”

Section: Catalyst Fouling By Heavy Carbonaceous Species and Its Mitig...mentioning

confidence: 99%

“…371,373 In general, it is proposed that the improved coke resistance is due to (1) the synergetic interaction between Ni and the dopants, which generates active oxygen species to facilitate the gasification of coke, 359,366,367,369 (2) the decreased acidity, which reduce the coke formation rate, 363,375 and (3) the improved gas diffusion, which facilitates the removal of products to avoid secondary coking reactions. 371,373 For acidic zeolite catalysts, the acid sites catalyze both the desired reactions and the undesired coking chemistries. Appropriate arranging of the acid site distribution can reduce the coke formation without sacrificing catalytic activity.…”

Section: Acsmentioning

confidence: 99%

Catalyst Deactivation and Its Mitigation during Catalytic Conversions of Biomass

Fan

Ramasamy

et al. 2022

ACS Catal.

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Biofuel or biochemical production from biomass, especially lignocellulosic biomass, is the most promising option to replace fossil-based products to achieve sustainability. However, biomass is currently under-utilized because biomass conversion technologies have faced significant challenges to compete with incumbent petroleum technologies. Advancement in catalysis plays a central role in increasing the readiness of biomass conversion technologies. In this respect, improving catalyst stability is one of the well-known grand challenges for biomass conversion catalysis, which impedes the scaling up and commercialization of many biomass conversion techniques. In comparison to conventional processing of fossil fuels (petroleum, coal, and natural gas), biomass conversion is largely challenged by three unique properties of biomass-derived feedstocks�high water and oxygen content, high contamination by minerals and heteroatoms, and high degree and reactivity of oxygen functionalization�which all cause greater catalyst deactivation in different ways. Therefore, research on catalyst deactivation mitigation and catalyst regeneration is extremely important for the development of biomass conversion technologies. This review aims to highlight studies on catalyst deactivation and mitigation for thermo-catalytic processes in biomass conversion, with emphasis on the deactivation of heterogeneous catalysts caused by the three unique characteristics of biomass-derived feedstocks. This work will provide information on correlating the characteristics of biomass-derived streams, their potential impact on catalyst lifetime, and a potential mitigation approach, which could guide a more rational design of a robust catalyst and processes for biomass conversion.

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“…Wang et al (Wang et al, 2020) found Fe-Ni bimetallic catalyst have a stable catalytic reaction performance, and it combined the advantages of two metal elements during the catalytic pyrolysis. Lin et al (Lin et al, 2021) have synthesised a char supported Ni-Fe catalyst with the hierarchical structure, they found its has high reaction acitivity for cracking tar, and the special structure would enhace the ability of deactivation and sinering of catalyst. Li et al (Li et al, 2022) invesitaged the deactivation mechanism of Ni-Fe catalyst and they found the activity of catalyst decreased due to the cumulative biomass/ catalyst ratio, but it was able to maintain the aromatic selectively of bio-oil, so it is necessary to control the ratio of biomass to catalysts.…”

Section: Introductionmentioning

confidence: 99%

Products distribution during in situ and ex situ catalytic fast pyrolysis of Chinese herb residues

Qian

Qin

et al. 2022

Environ Sci Pollut Res

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Catalytic fast pyrolysis (CFP) for biomass treatment is a research hotspot but there is little information about the difference between the in-situ and ex-situ methods. In present work, the Ni-Fe/CaO-Al 2 O 3 catalysts with different Ni/Fe ratios have been synthesized by coprecipitation method, and the products distribution about the Chinese herb residues (CHR) catalytic fast pyrolysis in in-situ and ex-situ methods have been investigated. The results shown that CFP pyrolysis would upgrading the quality of bio-oil but decrease the yields, no matter in-situ or ex-situ CFP process. During the in-situ CFP process, heteroatoms may be absorbed by the catalyst support and cannot be transferred to the bio-oil, but the results of ex-situ CFP is the opposite. In addition, ex-situ CFP reaction signi cantly increases the content of aromatic hydrocarbons. As to the gas products distribution, the effect of Fe in catalysts to promote CH 4 formation is re ected in in-situ CFP process, while the promotion effect of H 2 generation for Ni added in catalyst is mainly re ected in ex-situ CFP process. However, due to the high reaction temperature (800°C), the adsorption of CO 2 by CaO support is not particular signi cant. The possible mechanism of CHR in CFP process have also be summarized for understanding the process of in-situ and ex-situ CFP, and this study may provide a choice or reference for CHR treatment.

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Synthesis of modified char-supported Ni–Fe catalyst with hierarchical structure for catalytic cracking of biomass tar

Cited by 44 publications

References 53 publications

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

Catalyst Deactivation and Its Mitigation during Catalytic Conversions of Biomass

Products distribution during in situ and ex situ catalytic fast pyrolysis of Chinese herb residues

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