APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jiliang Ma,Aohua Li,Qiong Liu,Lei Chen,Min Hong,Runcang Sun
The photocatalytic conversion of biomass utilizing two-dimensional (2D) MBene as co-catalyst represents an exemplary approach for the sustainable production of syngas and lactic acid, capitalizing on the renewable resources of biomass carbon and solar energy. In this study, CrB MBene was synthesized via in-situ exfoliation in an HCl aqueous solution and subsequently integrated with Cd 0.8 Zn 0.2 S through an in-situ growth strategy, aiming to facilitate the photocatalytic co-production of lactic acid and syngas. Notably, the CZS/CrB-10 variant demonstrated a remarkable 12.3-fold enhancement in the hydrogen evolution rate (1746.6 μmol g −1 h −1 ) compared to standalone Cd 0.8 Zn 0.2 S, highlighting the exceptional co-catalytic efficiency and air stability of CrB MBene. Under optimal experimental conditions, the lactic acid yield and CO evolution rate attained 75.4 % and 917.8 μmol g −1 h −1 , respectively. The incorporation of CrB MBene as a co-catalyst was found to significantly improve sunlight utilization, enhance the separation and transfer of photogenerated charge carriers, and mitigate the recombination of electrons and holes. This research underscores the potential of CrB MBene as a promising and cost-effective co-catalyst, with implications for advancing artificial photosynthetic systems and the integration of photocatalytic biomass refining with water splitting technologies.
研究领域:
材料科学
·
可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Shan Hu,Yunfei Gao,Lu Ding,Xueli Chen,Weitong Pan,Fuchen Wang
Hydroformylation is an important reaction for aldehyde synthesis and requires ethylene and syngas (CO + H2) with the feedstocks. While these feedstocks are typically synthesized separately, it would be highly desirable to directly convert abundant ethane into ethylene and syngas in a single step. In this work, we loaded B2O3 onto perovskite La0.8Sr0.2FeO3 (LSF) and formed a core–shell structured catalyst, with B2O3 and Sr3B2O6 being the shell and LSF being the core. The shell structure can substantially inhibit deep oxidation of ethane into CO2 and the optimized La0.8Sr0.2FeO3@20B2O3 can achieve 69.2% ethane conversion and 88.8% ethylene + syngas selectivity at 700 °C with good stability, with a ratio of CO/H2 close to 1 : 1. The effects of reaction temperature, space velocity, B2O3 loading, and La/Sr were also investigated. This catalyst marks a promising progress for the direct oxidation of ethane and has good potential for industrial applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Junhao Lin,Jiaman Sun,Yi Chen,Juan Luo,Chongwei Cui,Shichang Sun
To directionally convert sludge into the high-quality syngas, the effects of various parameters on the biogas produced by the sludge microwave pyrolysis are explored, and the syngas generation mechanism under the synergistic effect of parameters is revealed. The results showed that the pyrolysis final temperature, reaction time, and the amount of the microwave absorber were the key factors that affected the biogas yield. A response surface analysis was used to explore the synergistic effect of each key parameter on the yield and the lower heating vale (LHV) of syngas. The pyrolysis temperature was the key to driving syngas generation. Properly prolonging the reaction time decreased the formation of tar by-products and increased the syngas yield. The addition of a microwave absorber increased the heating rate by enhancing the conversion efficiency of microwave energy, and this contributed to accelerating the dehydrogenation and the Boudouard reactions to promote the generation of H 2 and CO. Under high temperature conditions (900 °C), a higher syngas yield (10.25–34.31 mol/kg DS ) and LHV (4.85–14.53 MJ/kg DS ) were obtained in a shorter period time by synergistically optimizing the amount of microwave absorbers (8–10 g) and the reaction time (28–40 min). As the pyrolysis temperature increased, the H 2 content gradually rose to the peak, while the content of CO continued to increase. By analyzing the evolution of the specific pyrolysis products, the secondary pyrolysis of bio-oil at high temperatures and the Boudouard reaction were found to be the primary pathways that promoted syngas generation. This research provides strategic guidance for producing high-quality syngas using the microwave pyrolysis of waste biomass, thereby minimizing the exploration cost of basic experiments and providing directional control of the syngas quality.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Kun Zhao,Xiaojie Fang,Zhen Huang,Guoqiang Wei,Anqing Zheng,Zengli Zhao
Chemical looping gasification provides a novel technology to enable clean conversion of coal with inherent CO 2 capture. In this study, four types of NiFe 2 O 4 and CuFe 2 O 4 synthesized by sol–gel method and solid-phase method were used as oxygen carriers to promote the H 2 production from gasification of lignite. The effects of the types of oxygen carrier and oxygen carrier to coal (O/C) ratio on chemical looping gasification of lignite were first investigated by a thermogravimetric analyzer (TGA) combing with various analytical methods. The results show that, among four types of oxygen carrier, the NiFe 2 O 4 synthesized by sol–gel method exhibits the highest gasification reactivity with lignite char at an O/C ratio of 1, since its highly cubic spinel structure is beneficial to improve the mobility of lattice oxygen. Furthermore, the operating conditions for chemical looping gasification of lignite were optimized and the gasification performance of four types oxygen carriers was compared by using a fixed bed reactor. It is found that NiFe 2 O 4 synthesized by sol–gel method exhibits the highest total gas yield of 24.47 mol/kg and H 2 /CO ratio of 0.77 during chemical looping gasification of lignite under the optimal operating conditions, ascribed to Fe-Ni synergistic effect which provided higher gasification reactivity with lignite char. The addition of steam drastically improves the total gas yield and H 2 /CO ratio of syngas from 24.47 mol/kg and 0.77 to 64.98 mol/kg and 2.79, suggesting that the H 2 /CO ratio of syngas can be flexibly adjusted to meet the need of downstream process via controlling the amount of steam added. These findings provide an efficient method to obtain H 2 -rich syngas via chemical looping gasification of lignite.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yane Zheng,Kongzhai Li,Hua Wang,Dong Tian,Yuhao Wang,Xing Zhu,Yonggang Wei,Min Zheng,Yongming Luo
Chemical-looping reforming of methane (CLRM) offers an effective approach for coproducing syngas and pure hydrogen. In this work, CeO 2 nano particles (2–3 nm) are well dispersed on the wall surface of three-dimensional ordered macroporous (3DOM) LaFeO 3 , obtaining a highly efficient oxygen carrier for the CLRM technology. The physical and chemical properties of the oxygen carriers were characterized by SEM, TEM, H 2 -TPR, XPS, XRD, CH 4 -TPR and CH 4 -TPD techniques. It is found that the presence of CeO 2 on LaFeO 3 results in the formation of Ce 3+ and Fe 2+ due to the CeO 2 -LaFeO 3 interaction. The coexistence of Ce 3+ and Fe 2+ irons induces abundant oxygen vacancies on the mixed oxides, which strongly improves the reducibility, oxygen mobility and reactivity for methane oxidation. The presence of CeO 2 also improves the resistance towards carbon deposition formation, and this allows the CeO 2 /LaFeO 3 materials own high available oxygen storage capacity (available OSC, the maximum amount of oxygen consumed by methane reduction without the formation of carbon deposition). It is also noted that the agglomeration of CeO 2 nano particles would reduce the reactivity of oxygen carriers. Among all the obtained samples, the 10% CeO 2 /LaFeO 3 sample exhibits the highest yields of syngas (9.94 mmol g −1 ) and pure hydrogen (3.38 mmol g −1 ) without the formation of carbon deposition, which are much higher than that over the pure LaFeO 3 sample (5.73 mmol g −1 for syngas yield and 2.00 mmol g −1 for hydrogen yield). In addition, the CeO 2 /LaFeO 3 oxygen carrier also showed high stability during the successive CLRM testing either in the activity (yields of syngas and pure hydrogen) or structure (macroporous frameworks) aspect.
研究领域:
能源科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Siyuan Zhao,Ke Ma,Kailong He,Xiaoxun Ma,Chengyi Dai
Due to cost and energy consumption constraints, converting benzene into ethylbenzene using low-cost syngas instead of ethylene as an alkylation reagent is significant. However, when using syngas as the reaction raw material, generating ethylated side chains on the benzene ring is challenging. Instead, toluene/xylene becomes the primary product. We used a three-bed series connection method in a reactor, achieving one-step high selectivity of syngas and benzene to produce ethylbenzene. In the first bed layer (ZnAl2O4/SAPO-34), the syngas was first converted into methanol/dimethyl ether (DME) on ZnAl2O4. Then, it was further converted into low-carbon olefins on SAPO-34, with the microporous shape-selective effect of SAPO-34, inhibiting the generation of toluene/xylene in the alkylation of benzene with methanol/DME. At the same time, we proved that the absence of microporous shape-selective effect acid sites on the outer surface of S34 can lead to the occurrence of side reactions of benzene and methanol/DME methylation. In the second bed layer, SAPO-34 could continue to convert unconverted methanol/DME in the first bed layer into low-carbon olefins. In the third layer (ZSM-5), ethylene and benzene underwent highly selective alkylation on ZSM-5 to convert it into ethylbenzene. We found a “volcanic” curve relationship between the selectivity of ethylbenzene and the Brønsted acid site density of ZSM-5. On the one hand, Brønsted acid could catalyze the formation of ethylbenzene from benzene and ethylene; On the other hand, excessive Brønsted acid could lead to the isomerization of ethylbenzene to toluene/xylene. When the Brønsted acid showed a site density of 0.7 mmol/g, the selectivity of ethylbenzene was as high as 87%, with a byproduct of xylene showing only 0.3%, which is usually difficult to separate from ethylbenzene. Finally, the three-bed catalytic system showed no deactivation after 100 h.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guopei Zhang,Cong Wang,Xiaoyang Zhang,Yong Dong,Zhaomin Li,Leteng Lin
Effective elemental mercury (Hg 0 ) removal from syngas is essential for industrial mercury control. This study synthesized LaMeO x /ZSM-5 (Me = Zn, Cu, and Fe) sorbents via the sol–gel method and evaluated their Hg⁰ removal performance for simulated syngas at 50–250 °C. The physico-chemical properties of samples were characterized by Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), H 2 temperature-programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS). La 2 CuO 4 /ZSM-5 demonstrated superior efficiency (≥95 %) at 50–200 °C under simulated syngas, attributed to its porous structure and abundant surface-active oxygen. H 2 S significantly enhanced Hg 0 removal by forming active sulfur species, while H 2 , CO, and H 2 O inhibited performance due to competition for active sites. The inhibitory effects were mitigated by adding 500 ppm H 2 S. XPS and TPD analyses revealed HgS (cinnabar) as the dominant mercury species, with Cu 2+ ions and active oxygen critical for Hg 0 capture. Stability tests confirmed excellent reusability, with over 88 % efficiency maintained after 10 adsorption-regeneration cycles. La 2 CuO 4 /ZSM-5 emerges as a promising sorbent for Hg 0 removal, offering high efficiency, stability, and resistance to syngas components, making it suitable for industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 13
·3454-3468
·
IF 5.726
Huixian Zhong,Jiaming Wang,Kang An,Kegong Fang,Yuan Liu
A catalyst with a novel composition for direct ethanol synthesis from syngas was prepared and investigated in this work, which is Rh nanoparticles (NPs) highly dispersed on La2O3 modified LaFeO3, and the Rh NPs/La2O3–LaFeO3 was loaded on SiO2 with high surface area. The catalyst was prepared by using LaFe1−xRhxO3 in the perovskite phase as the precursor, which was transformed to Rh/La2O3–LaFeO3/SiO2 after reduction. The results showed that, compared to Rh–La2O3/SiO2, the activity and selectivity to ethanol were improved markedly, which was ascribed to the well-matched catalyzing process by the active sites of Rh0, Rh+ (or Rhδ+) and the oxygen vacancies on the surface of LaFeO3; of those, Rh0 dissociatively adsorbed CO and the latter two associatively adsorbed CO. Moreover, the interaction of La2O3 and LaFeO3 donated electrons to rhodium, which effectively adjusted the ratio of CO adsorbed associatively and dissociatively, and thus improved the selectivity to ethanol and lowered the selectivity to methanol. The catalyst also exhibited excellent resistance to the sintering of Rh NPs and to carbon deposition, which was attributed to the confinement of Rh NPs by La2O3 and LaFeO3, the eliminating effect of La2O3 and LaFeO3 and the very high dispersion of Rh NPs.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Saisai Liu,Jing Liu,Guanyi Chen,Jingang Yao,Beibei Yan,Weiming Yi,Zhanjun Cheng,Chunyan Tian,Huijie Zao
Syngas is a key precursor for synthesizing gasoline (C 5 -C 11 ) hydrocarbons, offering an efficient route for utilizing non-petroleum carbon sources. However, the conventional Fischer-Tropsch synthesis (FTS) process faces a constraint with a maximum 45% selectivity for C 5 -C 11 , attributed to the Anderson-Schultz-Flory (ASF) distribution. Herein, bifunctional catalysts comprising ZnZrO x with different Zr/Zn ratios along with SAPO-11 zeolite sieves featuring varied morphologies like nanosheets (SA-A), petals (SA-B), and spheres (SA-C) have been effectively formulated and employed for the syngas-to-gasoline hydrocarbons (STG) reaction. Notably, the selectivity toward C 5 -C 11 far exceeded the ASF limits. Under identical reaction parameters, the Zn 1 Zr 4 O x /SA-A catalyst demonstrated notable enhancements of 6.6% and 26.2% in CO conversion, along with 4.6% and 7.6% increases in C 5 -C 11 selectivity, as compared to that of Zn 1 Zr 4 O x /SA-B and Zn 1 Zr 4 O x /SA-C catalysts, respectively. Furthermore, under the ideal conditions (380 °C, 4.5 MPa and gas hourly space velocity (GHSV) of 2400 mL min −1 g −1 ), Zn 1 Zr 4 O x /SA-A exhibited an exceptional C 5 -C 11 selectivity of 69.8% (CO 2 -free) alongside a single-pass CO conversion of 30.4%. Impressively, isoparaffin constituted 39.2% of the total composition , with the iso/n-paraffin ratio reaching 11.8. Even after 100 h, the catalyst maintained its remarkable catalytic activity , with the CO conversion and C 5 -C 11 selectivity maintaining levels of 27.5% and 66.85%, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Yuanxing Wang,Cailing Niu,Yachuan Zhu,Da He,Weixin Huang
Producing syngas from electrochemical reduction of CO2 by renewable energy offers an opportunity to reduce CO2 emissions and provide chemicals and fuels. Herein, we report the careful manipulation of the reduction treatment to synthesize copper nanowire arrays (Cu NAs). By thermal oxidation, copper oxide nanowires were grown on a Cu mesh. Then, thermal reduction and electrochemical reduction were used to reduce copper oxide to Cu with the morphologic features largely preserved. The derived Cu NAs are cost-effective electrocatalysts capable of reducing CO2 and H2O for tunable syngas production. It is demonstrated that syngas, the mixture of H2 and CO, could be attained with a wide range of compositions (from 1:2 to 3:1) from CO2 reduction and H2O reduction on these Cu NAs in aqueous solutions. In addition, Cu NAs show a high current density, 4 mA/cm2, at a low potential, −0.5 V, with a high syngas faradaic efficiency of over 70%. This approach explores a new method that sheds light on tuning the syngas composition from the electrochemical CO2 reduction by Cu-based catalysts.
研究领域:
电化学
·
材料科学
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 1
·21
·
IF 3.082
Yang Han,Bo Wen,Mingyuan Zhu
In this study, we prepared core-shell structured Ni@SiO2catalysts using chemical precipitation and modified Stöber methods. The obtained Ni@SiO2samples exhibited excellent catalysis performances, including high CO conversion of 99.0% and CH4yield of 89.8%. Moreover, Ni@SiO2exhibited excellent catalytic stability during a 100 h lifetime test, which was superior to that of the Ni/SiO2catalyst. The prepared samples were characterized using a series of techniques, and the results indicated that the catalytic performance for syngas methanation reaction of the Ni@SiO2sample was markedly improved owing to its nanoreactor structure. The strong interaction between the Ni core and the SiO2shell effectively restrained the growth of particles, and the deposition of C species.Keywords:syngas methanation;Ni@SiO2;anti-carbon deposition;catalytic stability
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Tingwei Wang,Hanpeng Liu,Sam Toan,Zhao Sun,Zhiqiang Sun
Deoxygenation-based biomass gasification provides a feasible solution for the effective utilization of biomass and value-added syngas production. However, the behavior of bio-oil formation during the pyrolysis stage and the characteristics of tar abatement at the gasification stage with applied deoxidizer still require exploration. Thus, this study investigates the effects of different deoxidizer/biomass (D/B) mass ratios, pyrolysis-gasification temperatures, and water-injection velocities on the composition and yield of bio-oil and tar-elimination law. The techniques of 2D HSQC nuclear magnetic resonance, attenuated total reflectance, gel permeation chromatography, and gas chromatography-mass spectrometer are used to investigate the formation behavior and evolution law of the bio-oil produced. The results indicate that the addition of the deoxidizer not only improves the quality and yield of syngas but promotes the deoxygenation of oxygen-containing bio-oil by donating electrons. Specifically, the phenolic compounds decreased by 12.4% under D/B = 0.3 as compared with D/B = 0. The results also confirm the promoting effect of tar elimination via reforming and cracking by Fe and CaO, respectively: Tar production during the gasification stage decreased by 54% under D/B = 0.3, as compared with non-deoxygenation. This study demonstrates the superiority of iron-calcium-based deoxidizer in bio-oil deoxygenation and tar elimination, which will promote the development of deoxygenation-based bio-oil and syngas poly-generation.
研究领域:
能源与燃料
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）