WASTE MANAGEMENT
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2024
·
IF 7.1
Pengpeng Luan,Tiecheng Liu,Jinglan Wang,Beibei Yan,Guanyi Chen,Zhanjun Cheng
In this study, ex-situ catalytic pyrolysis of oxygen-containing polycarbonate (PC) was conducted to prepare carbon nanotubes (CNTs) and H 2 -rich syngas. This study examined the influence of the active metal components (Ni and Fe), catalyst pre-reduction, and pre-deoxygenation of pyrolysis volatiles on the catalytic performance and mechanism. Results show that the reductive constituents in pyrolysis volatiles make it difficult to reduce the Fe oxides, thus hindering the CNTs growth on Fe catalysts, compared to Ni catalysts. H 2 pre-reduction of Ni and Fe catalysts enhances the generation of CNTs and syngas. The pre-reduced Fe catalyst exhibits better carbon deposit performance, reaching 263 mg/g plastics . The pre-reduced Ni catalyst better facilitates the reforming reaction of CO 2 and H 2 O, resulting in higher syngas yields of 32.75 mmol/g plastics , with a volume proportion of 94.4 vol%. The addition of the deoxygenation catalyst Ni/HZSM-5 promotes the growth of CNTs with fewer defects and higher graphitization on Ni catalysts. The excess CO 2 and H 2 O generated by the introduction of Ni/HZSM-5 may oxidize the Fe 0 on pre-reduced Fe catalysts, inhibiting the growth of CNTs. The mechanism of the growth of CNTs and syngas from PC is also explored. The findings can provide theoretical guidance for the disposal of waste plastics.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yunlong Xia,Mengliang Gao,Ge Pu,Xingqiang Lu,Jie Gao,Jiale Wu,Qianhui Yang
The generation of high-quality syngas combined with high-purity hydrogen is an essential challenge in the chemical looping steam methane reforming (CL-SMR) process, in which the design of oxygen carriers (OCs) is crucial. In this study, La 2 FeBO 6 (B Cr, Ni，Co) and La 2 Fe 2-x Co x O 6 (x = 0.2, 0.4, 0.6, 0.8, 1.0) double perovskites have been investigated as OCs in the CL-SMR process. Various analytical techniques (BET, XPS, XRD, H 2 -TPR, Raman.) have been deployed to characterize the OCs' specific surface area, crystal structure, and surface oxygen species. The fixed-bed experiments revealed that the Cr-modified perovskite had the lowest reactivity, which was attributed to the creation of LaCrO 3 limiting the oxygen release rate of the OC. Meanwhile, Ni doping exhibited the maximum methane conversion (99.15 %), but it resulted in more carbon deposition due to methane cracking, and its carbon deposition was four times than that of Co doping. Whereas, the Co doped double perovskite OCs showed excellent overall performance, in which La 2 Fe 1.8 Co 0.2 O 6 (L 2 F 1.8 Co 0.2 ) exhibited the optimum CO selectivity (90.72 %), H 2 selectivity (96.91 %), and H 2 purity (96.84 %), as well as the lowest carbon deposition. Moreover, the L 2 F 1.8 Co 0.2 also exhibited outstanding stability in 10 cycles, and it could be a prospective material for CL-SMR, enabling the simultaneous generation of high-quality syngas and high-purity hydrogen.
研究领域:
化学工程
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材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 11
·F3029
·
IF 3.014
Haoran Xu,Bin Chen,Meng Ni
Syngas can be produced from H2O/CO2 co-electrolysis using an SOEC. However, H2 and CO are both produced in the cathode and the electricity consumption is large. In this paper, direct carbon-assisted SOEC for H2O electrolysis (DC-SOFEC) is proposed for cogenerating electricity power and syngas with easy control of H2/CO ratio. A 2D numerical model is developed to study the effects of operating and design parameters on the DC-SOFEC performance. The model is validated with experimental data for direct carbon solid oxide fuel cell. One important finding is that the carbon assisting is effective in lowering the equilibrium potential of SOEC, thus greatly reduces the electrical power consumption for H2O electrolysis. The DC-SOFEC can generate electrical power, CO and H2 simultaneously at a low current density and sufficiently high temperature. Compared with conventional SOEC for H2O/CO2 co-electrolysis, DC-SOFEC is advantageous as CO and H2 are produced in the anode and cathode, respectively. This enables easy control of H2/CO ratio, which is helpful for subsequent processes to synthesize other chemicals or fuels from syngas. Besides, DC-SOFEC can actually produce electricity rather than consuming it. The model can be used for subsequent design optimization of SOFEC for effective energy storage and conversion.
研究领域:
能源科学
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Wencong Sun,Li Zhou,Wenxue Tian,Shumiao Li,Min Yang,Chunxiang Li
Highly active noble metals and developed modified electrocatalysts are limited in terms of economy and kinetics for the electrocatalytic CO 2 reduction reaction (ECO 2 RR), respectively. Herein, different bimetallic chalcogenides (CuInSe 2 , CuInS 2 , AgInS 2 ) were found to have the ability to prepare proportionally tunable syngas in PV 3 Mo 9 medium at an ultra-low onset potential of −0.1 V (vs. RHE). The ECO 2 RR system established by CuInSe 2 and PV 3 Mo 9 achieved the widest CO/H 2 range (1.0–5.1), with a maximum j CO of −29.3 mA·cm −2 . The PV 3 Mo 9 medium had a positive effect on reducing the onset potential and improving the reaction kinetics. Theoretical calculations illustrated that the high activity of CuInSe 2 in PV 3 Mo 9 medium depended on the metal-like characteristic generated by the interaction of bimetallic orbitals and the mild regulation of *CO adsorption energy . This work demonstrates the broad application prospects of bimetallic chalcogenides in POM media in terms of ECO 2 RR activity and economic benefits.
研究领域:
材料科学
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化学工程
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能源研究
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2026
·
IF 3.4
Jingyi Zhang,Jiaming Wu,Yuren Zhao,Keyan Li,Xinwen Guo
Photocatalytic conversion of CO2 and H2O into syngas offers a green and sustainable pathway for the production of chemical feedstocks. However, most high-yield syngas production systems rely on a noble metal photosensitizer or cocatalyst, making it challenging to obtain cost-effective syngas. In this work, we designed and prepared S-scheme TiO2/CN heterojunctions with varying mass ratios by calcining the mixture of NH2-MIL-125(Ti) and pristine carbon nitride (CN). The combination of TiO2 with CN significantly enhances visible light absorption, and the formation of an S-scheme heterojunction effectively improves the separation and migration of photogenerated carriers. In addition, the enlarged specific surface area as well as the enhanced CO2 adsorption capacity also promote the photocatalytic CO2 reduction. Without any noble metal photosensitizer or cocatalyst, the 150TiO2/CN heterojunction demonstrated excellent performance to produce syngas. The production rates of CO and H2 are 6.2 and 1.9 mmol g–1 h–1, respectively, and the syngas production rate was 3.4 and 29.5 times that of pure CN and TiO2, respectively, when high-purity CO2 is used as the feed gas and the ratio of H2O/MeCN in solvent is 1:4. By adjustment of the composition of feed gas and solvent, high yield syngas with widely tunable CO/H2 ratios from 3.3:1 to 1:3.7 was achieved, and the maximum syngas production rate reached 12.1 mmol g–1 h–1. This work provides insights into the design of highly efficient photocatalysts for CO2 conversion to fuels or chemicals.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Xiaojie Gao,Huaming Dai
Improper disposal of industrial oily waste is environmentally hazardous, yet it constitutes a valuable resource owing to its higher energy density and hydrocarbon content. To tackle this dual issue, the coconversion of the oily waste and biomass was proposed within a porous media reactor, thereby turning waste into energy. An investigation was conducted on the effects of inlet gas conditions, oil-absorbing material properties, and liquid parameters on the temperature distribution and syngas production. The results indicate that the increased air velocity increases the combustion temperature while reducing the reaction time. And the mole fraction of hydrogen reaches its maximum value at an intermediate velocity of 8 cm/s. When methane is employed as an auxiliary fuel, the heating value of syngas significantly increases, and the hydrogen production decreases. The increasing pore diameter of the felt expands the high-temperature zone, which leads to a higher syngas production. As the felt thickness increases, the mole fraction of hydrogen initially rises before decreasing. Although wool felt increases the combustion temperature and reaction time, the hydrogen production is significantly lower than that of the PP-1. The increase in soybean oil volume reduces hydrogen production, while ethanol exhibits the opposite behavior, achieving a maximum value of 13.7%. At a soybean oil-to-ethanol blending ratio of 2:1, the heating value of syngas is higher. This work provides an efficient solution for the environmental treatment of oily wastes, which also demonstrates significant potential for low-cost hydrogen production.
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产品关联
DOI
高影响因子
ACS Catalysis
·
2026
·
IF 13.6
Ziguang Zhou,Yang Zhang,Jungang Wang,Bo Hou,Riguang Zhang,Lixia Ling,Debao Li,Baojun Wang
The use of anatase–rutile mixed-phase TiO2 (P25) as a support improves both CO conversion and selectivity toward low-carbon alcohols (C1–C5 mixed alcohols) during syngas conversion over Cu–Fe bimetallic catalysts. A 61.4% selectivity to low-carbon alcohols was obtained at a CO conversion of 35.0%. The low-carbon alcohol yield (21.5%) over CuFe/P25 is 31 and 3 times higher than the yields over Cu–Fe catalysts supported on pure anatase TiO2 and pure rutile TiO2, respectively. The anatase–rutile synergy in P25 contributes to the high dispersion of Cu–Fe species and facilitates electron transfer from the P25 support to both Cu0 and FeCx active sites via metal–support interaction. CuFe/P25 enhances both the capabilities of CO adsorption, dissociation, and non-dissociative insertion and the formation of CHx, CHO, and HCOO intermediates. These findings suggest that tuning the crystalline phase of the support constitutes a rational strategy for enhancing the catalytic activity of the metal sites.
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产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Dan Ping,Qingshuo Zhang,Weitao Liu,Shide Wu,Jing Gao,Haoyi Zhang,Shiwen Wang,Huajun Qiu,Shaoming Fang
Electrochemical CO 2 reduction reaction (CO 2 RR) to syngas represents a promising strategy to mitigate CO 2 emission and achieve carbon neutrality. Dual-site metal catalysts have emerged as an effective candidates for syngas production, however, challenges such as limited catalytic activity and inadequate control over the H 2 /CO ratio persist. Herein, a spatially separated dual-site catalyst containing cobalt phthalocyanine (CoPc) and ∼18 nm hollow Co 3 O 4 nanoparticles (NPs) was developed, in which CoPc and Co 3 O 4 are confined outside and inside the N-doped carbon (N–C) support, respectively. Experimental and calculation analyses reveal that the CoPc sites promote CO production, while the Co 3 O 4 NPs are responsible for H 2 production. The strong electronic coupling effect among CoPc, N–C and Co 3 O 4 NPs optimizes the electronic structure of catalyst and modulates the adsorption behaviors of reaction intermediates, leading to superior catalytic performance. A consistent H 2 /CO ratio of 2:1 is achieved across an extensive potential window ranging from −0.6 to −1.1 V vs . RHE, which is highly advantageous for industrial applications. Furthermore, adjustments in catalyst composition and microenvironment enable precise tuning of the H 2 /CO ratio from 1 to 2. This study provides a straightforward approach to designing dual-site catalysts for efficient syngas production.
研究领域:
电化学
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催化
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材料科学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Wang Lu,Mingwei Xia,Ziyue Tang,Yingquan Chen,Xianhua Wang,Haiping Yang,Hanping Chen
Poly-generation of porous char and H 2 -rich syngas is a key technology for the full and high-value use of carbon and hydrogen elements in biomass. In this study, the synergistic evolution and regulation mechanisms of H 2 and porous carbon during K-assisted bamboo gasification were investigated using fixed-bed pyrolysis-gasification system. The results show that, due to steam activation, both the H 2 production rate and the physicochemical properties of char initially increase and then decline with prolonged gasification time, reaching their peak in the middle stage of the process. The hydrogen conversion rate further indicates that partial gasification achieves higher production efficiency, which is favorable for the poly-generation. K accelerates the evolution of both char and H 2 , enhancing their quality and ultimately enabling the poly-generation of 31.5 mmol/g H 2 and porous carbon with a S BET of 1917 m 2 /g. Moreover, K promotes oxygen enrichment in char, particularly the incorporation of O=C-OR and C=O groups on the char surface, thereby improving the functional applicability of the carbon.
研究领域:
能源化学
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生物质转化
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催化化学
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环境功能材料
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热化学转化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122329
·
IF 7.5
Naeun Kim,Gihoon Kwon,Eilhann E. Kwon,Hocheol Song
Acid mine drainage (AMD) is a major environmental pollutant prevalent in areas impacted by mining activities. It poses serious risks to both human health and surrounding ecosystems due to its high acidity and the presence of toxic metals. In this study, AMD was utilized as a catalytic medium for the thermochemical conversion of sawdust (SD), aiming to valorize AMD and enhance the efficiency of the thermochemical process. AMD-treated SD was pyrolyzed under various conditions to examine product yields and their functional properties. AMD promoted the decomposition of hemicellulose and cellulose components in SD, leading to increased production of syngas (H 2 , CH 4 , and CO), and shifted the bio-oil composition toward higher yields of furfural and levoglucosenone (LGO). The biochar produced from AMD-treated sawdust exhibited a mesoporous structure and contained catalytically active species such as Fe⁰ and CaS. This biochar efficiently activated sodium persulfate for the degradation of acetaminophen ( k obs = 0.04 min −1 ), with sulfate radicals (SO 4 •− ) identified as the primary reactive species. The catalyst demonstrated high stability, maintaining over 91% acetaminophen removal efficiency after multiple reuse cycles. Overall, this study introduces a novel approach that integrates AMD valorization with the production of renewable fuels, platform chemicals, and functional biochar, offering a sustainable strategy for waste remediation and environmental applications.
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DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 2
·199
·
IF 3.444
Xiaoli Li,Junfeng Zhang,Min Zhang,Wei Zhang,Meng Zhang,Hongjuan Xie,Yingquan Wu,Yisheng Tan
The types of supports employed profoundly influence the physicochemical properties and performances of as-prepared catalysts in almost all catalytic systems. Herein, Cu catalysts, with different supports (SiO2, Al2O3), were prepared by a facile impregnation method and used for the direct synthesis of higher alcohols from CO hydrogenation. The prepared catalysts were characterized using multiple techniques, such as X-ray diffraction (XRD), N2sorption, H2-temperature-programmed reduction (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared spectroscopy (FTIR), etc. Compared to the Cu/Al2O3catalyst, the Cu/SiO2catalyst easily promoted the formation of a higher amount of C1 oxygenate species on the surface, which is closely related to the formation of higher alcohols. Simultaneously, the Cu/Al2O3and Cu/SiO2catalysts showed obvious differences in the CO conversion, alcohol distribution, and CO2selectivity, which were probably originated from differences in the structural and physicochemical properties, such as the types of copper species, the reduction behaviors, acidity, and electronic properties. Besides, it was also found that the gap in performances in two kinds of catalysts with the different supports could be narrowed by the addition of potassium because of its neutralization to surface acidy of Al2O3and the creation of new basic sites, as well as the alteration of electronic properties.
研究领域:
催化化学
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能源化学
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材料化学
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工业催化
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表面科学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 9
·2000205
·
IF 3.404
Qiang Liu,Jiaming Wang,Kang An,Siran Zhang,Guilong Liu,Yuan Liu
In view of the dual active sites mechanism of direct ethanol synthesis and the excellent catalytic performance of bimetallic catalysts, a series of Ni–Fe alloy catalysts with different Ni/Fe molar ratios derived from layered double hydroxides (LDHs) precursors are synthesized. During the calcination and reduction process of LDHs precursors, the Ni–Fe alloy is obtained, and attributed to all the elements being evenly dispersed at the atomic level in the LDHs precursors; meanwhile, a strong interaction between Ni–Fe alloy and MgAl 2 O 4 support exists. As a result, Ni–Fe alloy nanoparticles are highly dispersed on the MgAl 2 O 4 surface. The high CO adsorption ability on the Ni–Fe alloy and synergism catalysis between Ni and Fe result in excellent catalytic activity and high selectivity to ethanol on the bimetallic Ni–Fe alloy. In addition, the strong antisintering ability and stable alloy structure bring about a good catalytic stability. This research proposes a new catalytic system for direct ethanol synthesis from syngas.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）