Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Ayesha Idrees,Ali Shan,Waqas Qamar Zaman,Ali Mohsin,Zain Abbas,Tanvir Shahzad,Atif Shakeel,Shuguang Lyu
M-metal (Ca and Cu) doped Ca-Fe 2 O 3 and Cu-Fe 2 O 3 catalysts were synthesized using solvothermal method. The Ca-Fe 2 O 3 and Cu-Fe 2 O 3 catalysts were characterized by XRD, Raman spectroscopy , SEM , TEM and XPS spectroscopy. The catalytic performance of 6%Ca-Fe 2 O 3 and 5%Cu-Fe 2 O 3 catalysts for trichloroethylene (TCE) removal were improved by M-metal doping leading to TCE removal at 99.8% in 1 h, which were three folds greater than by simple a- Fe 2 O 3 in the presence of persulfate (PS). Ca and Cu doping formed defective structure and created more oxygen vacancies thereby generating abundant active species during PS activation process. Further, the influence of catalysts’ dosage, oxidant dosage, solution pH, inorganic anions, and dissolved oxygen were evaluated. Complete removal of TCE was also obtained at weak alkaline pH condition. The greater specific surface area and the improved electrical conductivity was attributed to the huge generation of O 2 •– and 1 O 2 species which played major part in TCE removal. Scavenging tests and ESR spectroscopy confirmed the dominant role of O 2 •– and 1 O 2 in TCE degradation. The stability and viability of 6%Ca-Fe 2 O 3 and 5%Cu-Fe 2 O 3 catalysts were evaluated by repetition tests and in the presence of surfactants, TCE removal in real water matrix, and in the degradation of multi-pollutants.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Qiuxia Liu,Meicheng Wen,Yunlong Guo,Shengnan Song,Guiying Li,Taicheng An
Cyclohexane, a typical volatile organic compound (VOC), poses high risks to the environment and humans. Herein, synthesized PdAg/Fe2O3 catalysts exhibited exceptional catalytic performance for cyclohexane combustion at lower temperatures (50% mineralization temperature (T50) of 199 °C, 90% mineralization temperature (T90) of 315 °C) than Pd/Fe2O3 (T50 of 262 °C, T90 of 335 °C) and Fe2O3 (T50 of 305 °C, T90 of 360 °C). In addition, PdAg/Fe2O3 displayed enhanced stability by alloying Ag with Pd. The redox and acidity of the PdAg/Fe2O3 were studied by XPS, H2-TPR, and NH3-TPD. In situ diffuse reflectance infrared Fourier transform spectroscopy and proton-transfer-reaction time-of-flight mass spectrometry were applied to identify the intermediates formed on the catalyst surface and in the tail gas during oxidation, respectively. Results suggested that loading PdAg onto Fe2O3 significantly enhanced the adsorption and activation of oxygen and cyclohexane, oxidative dehydrogenation of cyclohexane to benzene, and catalytic cracking of cyclohexane to olefins at low temperatures. This in-depth study will benefit the design and application of efficient catalysts for the effective combustion of VOCs at low temperatures.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yuqing Pan,Na Li,Ke Li,Shiyuan Ran,Chenyang Wu,Qulan Zhou,Jiyuan Liu,Shuzhou Li
The industrial applications of de-NOx require the high activity window of the catalysts to be shifted from high to low temperatures for energy saving. Selective catalytic reduction (SCR) of NOx by CO, as an alternative to NH 3 -SCR, is a promising de-NOx technology that facilitates the synergistic removal of pollutants. Herein, we report a new Fe 2 O 3 /amorphous SiO 2 catalyst with high low-temperature activity for CO-SCR. A combination of experiments and density functional theory (DFT) calculations obtains direct evidence that an optimal content of oxygen vacancy enhances the low-temperature NO conversion ratio and N 2 selectivity of Fe 2 O 3 -based catalyst to over 80% and maintain 100% CO conversion by promoting NN coupling via ONNO/N 2 O and NCO/NNCO 2 intermediates. Compared with conventional defect engineering, such as doping other metals or artificially generating oxygen defects, the α-Fe 2 O 3 (1 1 0) facet automatically enables an oxygen vacancy generation-filling cycle in the CO-SCR reaction, following Mars-van Krevelen (MvK) mechanism. This work advances a fundamental understanding of CO-SCR reaction mechanism over Fe 2 O 3 -based catalysts and provides insights for future studies to improve heterogeneous metal oxide catalysts.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
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IF 16.6
Wang Xianhui,Pei Chunlei,Zhao Zhi-Jian,Chen Sai,Li Xinyu,Sun Jiachen,Song Hongbo,Sun Guodong,Wang Wei,Chang Xin,Zhang Xianhua,Gong Jinlong
Redox catalysts play a vital role in chemical looping oxidative dehydrogenation processes, which have recently been considered to be a promising prospect for propylene production. This work describes the coupling of surface acid catalysis and selective oxidation from lattice oxygen over MoO 3 -Fe 2 O 3 redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe 2 O 3 introduce effective acid sites for the promotion of propane conversion. In addition, Mo could also regulate the lattice oxygen activity, which makes the oxygen species from the reduction of γ-Fe 2 O 3 to Fe 3 O 4 contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe 2 O 3 . The enhanced surface acidity, coupled with proper lattice oxygen activity, leads to a higher surface reaction rate and moderate oxygen diffusion rate. Consequently, this coupling strategy achieves a robust performance with 49% of propane conversion and 90% of propylene selectivity for at least 300 redox cycles and ultimately demonstrates a potential design strategy for more advanced redox catalysts.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
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2021
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IF 4.185
Ye Wu,Jian Mei,Tianyi Cai,Wei Wang,Hang Zhu,TianLi Sun,Dong Liu
Ammonia is considered to be a green energy due to its carbon-free footprint, high energy density, cheap transport costs and so on. However, the problem of NO x (mainly NO/NO 2 ) emissions especially at high temperature (>800 °C) inhibits the energy utilization progress of NH 3 (Such as NH 3 combustion). So, catalytic combustion of NH 3 is supposed to be a promising method to solve this problem but there is a rare report on that. The NO x emissions or N 2 selectivity performances in the NH 3 oxidation process with different catalyst was conducted with Density functional theory (DFT) and experimental studies. Results showed that, when Fe 2 O 3 was used as catalyst, the conversion efficiency of NH 3 was 96.2%, and the selectivity of N 2 was 97.7%, which was higher than oxidation of NH 3 without catalyst. DFT simulation showed that NH 3 and O 2 can be separately adsorbed on Fe (top) of Fe 2 O 3 (001), the adsorption of NH 3 and O 2 were enhanced when they were put on Fe (top) of Fe 2 O 3 (001) at the same time. Meanwhile, the length of inter-atomic bond increased thus creating oxygen vacancy , which promoted the oxidation of NH 3 . Finally, a Ni modified Fe-based catalyst (NiO10%/Fe 2 O 3 30%/Al 2 O 3 60%), full of oxygen vacancy (confirmed with X-ray photoelectron spectroscopy (XPS)), was fabricated with impregnation method. The adsorption of NH 3 and O 2 were further enhanced (confirmed by DFT simulation), the NH 3 conversion efficiency and the N 2 selectivity were stably improved to 96.8% and 100%.
研究领域:
化学工程
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环境科学
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催化材料
✓ 已验证
DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 23
·11788-11793
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IF 3.708
Yanyan Fang,Hailian Xiao,Ning Sui,Manhong Liu,William W. Yu
Supported Pt nanocatalysts with controlled particle size and size distribution were prepared by immobilizing Pt colloids on different iron oxide supports (γ-Fe2O3, Fe3O4, Fe2O3) via physical adsorption. These catalysts were used to catalyze the liquid phase hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN) under mild reaction conditions (298 K, 0.1 MPa). The Pt/γ-Fe2O3 exhibited higher catalytic selectivity and activity than other similar works (selectivity = 99.9%, activity = 0.20 molo-CNB/(molPt s)). The stability of the Pt/γ-Fe2O3 was investigated, and the result showed that higher drying temperature could increase the stability of the catalyst.
研究领域:
化学工程
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催化材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Energy Research
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2022
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IF 3.858
Baimoldina Adel,Papadikis Konstantinos,Konysheva Elena Yu.
The incorporation of mono-sized particle catalysts in real industrial systems for biomass conversion is a significant challenge, hence the impact of individual α-Fe2O3 catalysts with varying non-ideal spherical sizes of 54 nm (FS054), 221 nm (FS221), and ∼2 µm (FSm002) as well as dual-sized mixtures (FS054-FS221 and FS221-FSm002) were considered in the catalytic upgrading of pinewood pyrolysis vapors. The size variation of the α-Fe2O3 catalyst revealed a substantial effect on the product distribution. Although the yield of phenols shows a decrease by almost a factor of two irrespective of the catalyst particle size, the FS221 catalyst demonstrates the most potent effect on reducing phenols through decarboxylation reactions. Considering the role of the catalyst on the individual phenolics, the FS221 catalyst reveals higher selectivity towards the reduction of 2-methoxyphenol, isoeugenol, and eugenol, whereas the application of FS054 catalysts displays a stronger impact on the decrease of creosol and other phenols. Both FS054 and FS221 catalysts showed the highest effectiveness in reducing the relative yield of 2-methoxy-4-vinylphenol. Applying a dual-size mixture (FS054-FS221) shows a synergetic effect, simultaneously decreasing the content of phenols, acids, and aldehydes followed by a strong CO2 release attributed to competitive decarbonylation reactions of aldehydes. The appearance of γ-Fe2O3 small fraction was revealed in the powders with mono-(FS221) and dual particle size (FS054-FS221 and FS221-FSm002), whereas the FS054 and FSm002 catalysts demonstrate good chemical and phase stability.
研究领域:
化学工程
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材料科学
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能源与燃料
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1598
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IF 3.1
Yongqi Liu,Shasha Chu,Yuebing Xu,Xinyu Chen,Hao Zhou,Jinlin Li,Yanjie Ren,Xintai Su
Upcycling Cr-containing sulfate waste into catalysts for CO2hydrogenation reaction benefits both pollution mitigation and economic sustainability. In this study, FeCrO3/Fe2O3catalysts were successfully prepared by a simple hydrothermal method using Cr-containing sodium sulfate (Cr-SS) as a Cr source for efficient conversion and stable treatment of Cr. The removal rate of Cr in Cr-SS can reach 99.9% at the optimized hydrothermal conditions. When the synthesized catalysts were activated and used for the CO2hydrogenation reaction, a 50% increase in CO2conversion was achieved compared with the catalyst prepared by impregnation with a comparable amount of Cr. According to the extraction and risk assessment code (RAC) of the Reference Office of the European Community Bureau (BCR), the synthesized FeCrO3/Fe2O3is risk-free. This work not only realizes the detoxification of the Cr-SS but transfers Cr into stable FeCrO3for application in a catalytic field, which provides a strategy for the harmless disposal and resource utilization of Cr-containing hazardous waste.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Shenghong Wang,Changan Zhou,Yongda Cao,Lei Song,Lirong Zheng,Kui Ma,Hairong Yue
Electrochemical water–gas shift (EWGS) reaction is an emerging technology with energy-saving and environmental-friendly advantages to produce high-purity hydrogen form the waste gas containing CO. However, it remains a significant challenge to design superior activity and highly durable EWGS electrocatalysts, particularly with low content of noble metals. Herein, a series of Pt-xCu/Fe 2 O 3 (x = 0, 2, 5) catalysts are synthesized by the complexation precipitation method to construct coupling sites between Pt and CuOx, aiming to optimize the adsorption of CO and the activation of OH – . The obtained 2.5Pt-2Cu/Fe 2 O 3 catalyst presents a unique Pt-O-Cu structure, delivering a much lowest onset potential, high specific activity, and excellent mass activity (1.5 A·mg Pt -1 ) at 0.73 V ( vs. RHE), which is over 15 and 3 times that of commercial Pt/C (20%) and unmodified Pt/Fe 2 O 3 catalyst, respectively. Meanwhile, the in-situ X-ray absorption results demonstrate that the facilitated interaction among the Pt-O-Cu structure promotes the high durability of the 2.5Pt-2Cu/Fe 2 O 3 catalyst and the operability at high potential. More importantly, the moderate binding of CO and moderate activation of OH* are suggested for boosting the reactivity in the CO electro-oxidation reaction. In particular, the fabricated Pt||2.5Pt-2Cu/Fe 2 O 3 , employed in coupling the HER and CO electro-oxide reaction, shows a remarkable hydrogen production of about 98 mmol H2 ·h −1 ·mg Pt −1 at 0.8 V ( vs. RHE). This work also definitely confirms the possibility of the catalyst being applied to produce hydrogen under practical conditions with different concentrations of CO, even being applied in the purification of trace CO in a hydrogen-rich atmosphere.
研究领域:
材料科学
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催化化学
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能源化学
✓ 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）