JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 8.4
Zewei Liu,Liping Zhang,Mingqian Cheng,Ling Chen,Wei Fang,Qihong Cen,Chao Chen,Bin Li
CF 4 , is a highly potent greenhouse gas emitted by the electrolytic aluminum industry, with a global warming potential 7390 times that of CO 2 . Its urgently necessary to effectively control and decompose it. Alumina industry is the upstream of electrolytic aluminum industry, from which the red mud (RM) generated should be recycled. In this study, the decomposition performance of CF 4 was improved by loading γ-Al 2 O 3 on hydrochloric acid-treated RM. Under optimal conditions (reaction temperature of 650 °C, WHSV of 1500 h −1 , and material dosage of 1 g), the decomposition efficiency of Al 1 HRM 2 for CF 4 reached 85 %. Compared with the unmodified acid-treated RM (HRM), the conversion rate and stability were significantly improved. The results of NH 3 -TPD, Py-IR and XPS indicated that acid treatment and addition of γ-Al 2 O 3 significantly increased the Lewis acid site and medium-strong acid site of Al 1 HRM 2 . During the reaction, CF 4 adsorbs and dissociates at the strongest Lewis acid site (Al Ⅲ ), forming an intermediate (CF 2 O) and CO 2 to achieve the decomposition of CF 4 . In comparison with existing decomposition techniques, the method proposed here avoids the generation of corrosive HF, while also promoting the development of a greener aluminum industry and the formation of high-value fluorides.
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Hao Zhang,Guang-Ren Qian,Hong Liu
Alumina composites containing microporous ZSM-5 (Z-5) and mesoporous ZSM-5 (MZ-5), corresponding to x ZA and x MZA, were developed by incorporating Z-5 and MZ-5 into γ - Al 2 O 3 , respectively. The two series of NiMoS/ x MZA and NiMoS/ x ZA catalysts were prepared with these two composites as supports, respectively, and were used for the simultaneous hydrodesulfurization (HDS) of thiophene (T) and benzothiophene (BT). The results show that NiMoS/ x MZA series catalysts exhibit higher HDS activity than that of NiMoS/ x ZA and NiMoS/γ-Al 2 O 3 , and the HDS activity of NiMoS/ x MZA catalysts increases with the increase of MZ-5. The high HDS activity can be mainly attributed to the synergistic effects of the efficient diffusing pore channels, high dispersion of type II NiMoS phases, suitable acidity, and moderate Mo-support interaction. Moreover, the product distribution of HDS shows that the NiMoS/ x MZA catalysts possess the dominant direct desulfurization (DDS) selectivity and the selectivity increases with the increase of MZ-5 content due to more corner sites and suitable Brønsted (B) acid sites, whereas the NiMoS/ x ZA catalysts perform more excellent hydrogenation (HYD) selectivity, and the selectivity increases with the increase of Z-5 content because of the existence of more edge sites. Based on this, the possible reaction network for T and BT hydrodesulfurization over the catalysts are proposed.
研究领域:
催化化学
·
能源化工
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 75
·期 6
·1466-1473
·
IF 1.197
Li Shifeng,Qi Fang,Xiao Min,Fan Hongtao,Shen Yanming,Du Kaige,Zhang Zhigang,Li Wenxiu
Mg-Al layered double hydroxides (LDHs) adsorbent was synthesized in situ on γ -Al 2 O 3 for the removal of Cr(VI) from aqueous solution. The material was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electronic microscopy and thermogravimetry and differential thermal analysis. Compared to the LDHs powder, the calcined LDHs sorbent prepared in situ on γ -Al 2 O 3 had higher specific surface area and was easy to recover and reuse. The adsorptive capacity for removing Cr(VI) from aqueous solution was resulting from the memory effect of LDHs based on the XRD results. Both the pseudo-second-order kinetic model and the Langmuir model fit the experimental data well. Furthermore, the adsorbent exhibits excellent sorption–regeneration performances.
研究领域:
环境科学
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材料化学
·
水处理
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Weizhen Zhang,Wenqian He,Qian Yan,Lele Zhang,Nan Ni,Shaorui Song,Shuhua Tu,Jie Feng
Surfactant-free interfacial synthesis of hollow Al 2 O 3 via kinetic modulation • Chelation enables precursor transition from hydrophobic to amphiphilic states. • Simple room-temperature strategy bypasses harsh energy-intensive methods. • PDRC coatings deliver 97.6% solar reflectance and 0.976 mid-IR emissivity. • The scalable coatings realize a remarkable sub-ambient cooling of 9.66 °C. Hollow γ-Al 2 O 3 architectures are highly attractive for passive daytime radiative cooling (PDRC) owing to their low density and unique optical characteristics. However, their fabrication typically relies on sacrificial templates, hydrothermal treatments, or high-temperature processing, while the intrinsically ultrafast hydrolysis of aluminum alkoxides has long prevented their use in hollow-structure engineering. Here, we report a surfactant-free, chelation-enabled interfacial synthesis strategy that overcomes this limitation through kinetic regulation of aluminum sec-butoxide. The coordination process gradually transforms the precursor from hydrophobic to amphiphilic, enabling spontaneous self-emulsification and controlled interfacial assembly. As a result, hierarchical hollow γ-AlO(OH) microspheres are obtained at room temperature and subsequently converted into hollow γ-Al 2 O 3 microspheres by calcination. The resulting hollow γ-Al 2 O 3 microspheres exhibit tunable diameters (3.3–15.8 μm), uniform nanoscale shells (162 ± 60 nm), and an ultralow density of 0.083 g·cm −3 . The process is readily scalable using an industrial homogenizer. When incorporated into coatings, the hollow microspheres provide abundant dielectric interfaces that enhance solar reflection and thermal emission, delivering a solar reflectance of 97.6%, an atmospheric window emissivity of 0.976, and a sub-ambient cooling of 9.66 °C under a solar irradiance of 454.5 W·m −2 . This work provides a scalable and energy-efficient manufacturing strategy for hollow γ-Al 2 O 3 architectures, offering significant potential for large-area radiative cooling coatings and thermal management applications. Download: Download high-res image (108KB) Download: Download full-size image
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·849
·
IF 3.444
Zeyu Xue,Zhaoping Zhong,Bo Zhang,Chao Xu
To investigate the catalytic pyrolysis performance of complex metal oxide catalysts for biomass, γ-Al2O3was prepared through the precipitation method, and then ZrO2and γ-Al2O3were blended in the proportion of 2:8 using the co-precipitation method. Next, CeO2was loaded on the surface of the catalyst for further modification. The three catalysts, A, ZA and CZA, were obtained. The specific surface and acidity of the catalysts were characterized by nitrogen adsorption–desorption and NH3-Temperature Programmed Desorption (NH3-TPD) respectively. The catalytic pyrolysis performance of catalysts for bamboo residues was investigated by Pyrolysis gas chromatography mass spectrometry (Py-GC/MS). Chromatograms were analyzed for identification of the pyrolysis products and the relative amounts of each component were calculated. Experimental results indicated that catalyst A had a good catalytic activity for the fast pyrolysis of bamboo residues. The addition of ZrO2and CeO2could continuously enhance the acidity of the catalyst and further promote the pyrolysis of macromolecular compounds and deoxidation of oxygen-containing compounds. Finally, catalyst CZA, obtained by compound modification, could not only dramatically reduce the relative content of phenol, acid and aldehyde and other oxygen-containing compounds, but also achieved the maximum hydrocarbon yield of 23.38%. The catalytic performance of catalyst CZA improved significantly compared with catalyst A.Keywords:biomass;pyrolysis;catalytic cracking;Py-GC/MS;complex metal oxides
研究领域:
能源与燃料化学
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催化化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yaqi Qu,Xiang Li,Hualiang An,Xinqiang Zhao,Yanji Wang
The selective hydrogenation of dimethyl toluene-2,4-dicarbamate (TDC) to methyl cyclohexyl-2,4-dicarbamate (also called hydrogenated TDC, HTDC) is an essential process for non-phosgene synthesis of methylcyclohexane-2,4-diisocyanate. Herein, we prepared a series of supported Rh-based catalysts by the excessive impregnation method and investigated their catalytic performance for the selective hydrogenation of TDC. The emphasis was put on the influence of support properties on the catalytic performance. Among the prepared catalysts, Rh/γ-Al 2 O 3 performed the best: a HTDC yield of 88.4% was achieved with a 100% conversion of TDC under the conditions of 100 °C, 3 MPa and 1 h. Furthermore, Rh/γ-Al 2 O 3 could be repetitively used for 4 times without a significant loss of its catalytic activity. TEM, XRD, N 2 adsorption-desorption, H 2 -TPR, NH 3 /CO 2 -TPD, XPS and ICP characterizations were employed to distinguish the properties of the prepared catalysts and the results were correlated with their catalytic performance. It is indicated that the yield of HTDC shows a positive relevance with the percentage of moderate-to-strong acid sites and the content of Rh n + ( n ≥3) in the catalysts. High values of the percentage and the content can promote a strong interaction between Rh nanoparticles and the supports, facilitating both the transfer of electrons from Rh to the support and the formation of Rh n + species. This is conducive to activating the benzene ring of TDC and thereby improving the yield of HTDC.
研究领域:
催化
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化学工程
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材料科学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 8
·1439
·
IF 2.468
Yue Teng,Ke Yao,Wenbin Song,Yongjun Sun,Haoliang Liu,Zhiying Liu,Yanhua Xu
Cu-Mn-Ce@γ-Al2O3was prepared by incipient wetness impregnation and used to catalyze ozonation in a coal chemical wastewater-biotreated effluent. The preparation factors that considerably affected the catalytic performance of Cu-Mn-Ce@γ-Al2O3, specifically metal oxide loading percentage, calcination temperature, and calcination time, were examined. The catalyst was characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and Brunauer-Emmett-Teller analysis. The optimal catalytic ozonation operating parameters, such as ozone dosage, catalyst dosage, pH, and reaction time, were also investigated. Results showed that an optimized catalyst consisted of 17.0% CuO, 3.0% MnO2, and 2.0% CeO2(wt.%). The optimal calcination temperature and calcination time were 600 °C and 5 h. The optimal catalytic ozonation operating parameters, including ozone dosage, catalyst dosage, pH, and reaction time, were 7, 80.0 mg/L, 20.0 mg/L, 7 and 50 min, respectively. The COD removal of biotreated effluent increased to 61% under these optimal operating conditions. Meanwhile, ozonation alone resulted in only 20% removal. This work proposes the use of easily available Cu-Mn-Ce@γ-Al2O3catalyst and might drive the advancement of catalytic ozonation for chemical wastewater purification.Keywords:catalyst;catalytic ozonation;coal chemical wastewater;advanced treatment
研究领域:
环境科学
·
化学工程
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PubMed
高影响因子
High Voltage
·
2022
·Vol. 8
·期 2
·274-282
·
IF 4.967
Song Xiao,Junyi Chen,Peng Wu,Qiang Yao,Long Li,Xuanpei Pang,Shiling Zhang,Xiaoxing Zhang,Yi Li
C 4 F 7 N is considered to be the most potential alternative gas for SF 6 . However, harmful decomposition by-products generated by the discharge or overheating faults will pose threat to safe operation and service life of gas insulated equipment (GIE). Herein, we investigated the adsorption performance of γ -Al 2 O 3 on C 4 F 7 N and its decomposition products to evaluate the possibility of using it as by-products adsorbent or exhaust treatment material. It is found that γ -Al 2 O 3 demonstrates superior adsorption capacity for CF 4 , C 2 F 6 , C 3 F 8 , C 3 F 6 , C 2 F 4 , and keeps stable after the interaction. The first-principles calculation infers that γ -Al 2 O 3 has stronger interaction with C 4 F 7 N, C 3 F 6 and C 3 F 8 than that of C 2 F 4 , C 2 F 6 and CF 4 . There exists obvious charge transfer between C 4 F 7 N and γ -Al 2 O 3 , which belongs to chemisorption. The interaction between F 2p orbital and C=C π orbital determines the gas-solid adsorption performance. The desorption properties were also explored and the recovery time was in order of CF 4 < C 2 F 6 < C 2 F 4 < C 3 F 8 < C 4 F 7 N < C 3 F 6 . Overall, the γ -Al 2 O 3 is inappropriate to be used as the adsorbent for decomposition by-products of C 4 F 7 N gas mixture-based GIE, while it can be used as exhaust treatment material for C 4 F 7 N wasted gas.
研究领域:
电气工程
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环境科学
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材料科学
·
物理化学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Run Pan,Abubakar Yusuf,Chengjun Wang,Jianrong Li,Zhiyu Xiao,Shuai Liu,Yidong Zhong,Yong Ren,Zheng Wang,Hainam Do,John L. Zhou,George Zheng Chen,Jun He
Natural gas vehicles (NGVs) offer significant environmental advantages by reducing pollutant emissions, but effective exhaust treatment remains a challenge due to high methane emissions and catalyst deactivation over time. This study introduces a core-shell Pd@CeO 2 /Al 2 O 3 three-way catalyst (TWC) designed to enhance the efficiency and durability of NGV exhaust treatment. The core-shell structure significantly improves catalytic performance. The optimized Pd@Ce/Al (S-500) catalyst demonstrates excellent low-temperature activity, with T 50 values of 336 °C for CH 4 and 397 °C for NO. It also achieves remarkable reductions of 113 and 177 °C in the T 90 for CH 4 and NO conversion, respectively, compared to the non-core-shell counterpart, Pd-Ce/Al (S-500). Characterizations reveal enhanced metal-support interactions, increased oxygen vacancies, and optimized Pd-CeO 2 interfaces as key active sites. Density functional theory calculations further demonstrate that the core-shell structure facilitates electron transfer at Pd-CeO 2 interfaces and lowers energy barriers for three-way reactions, enhancing catalytic efficiency. Notably, the core-shell Pd@Ce/Al (S-500) catalyst maintains high conversion efficiency for CH 4 and NO, with only slight losses (5.5% and 6.6%, respectively) over a 100-h time-on-stream stability test, following 16 h of harsh hydrothermal aging at 800 °C, showcasing its long-term stability. These findings provide a deeper understanding of the role of the core-shell Pd@CeO 2 structure in Pd-based TWCs and offer valuable insights for designing durable and efficient catalysts to meet the stringent emission standards of NGVs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Tianyi Huang,Chenxian Zhao,Danyang Zhao,Yujun Wang,Guangsheng Luo
The exposure of crystal planes is a crucial determinant of support activity and effective metal anchoring in catalysis. Herein, we develop an efficient process for designing the crystal planes of alumina microspheres. The mechanism involves hydrogen bond adsorption between octanol and boehmite, alongside the hindrance effect of hydrophobic carbon chains on hydration layer, to achieve effective exposure of the γ-Al 2 O 3 (100) crystal plane. HRTEM and 27 Al NMR analyses confirm that the proportion of exposed γ-Al 2 O 3 (100) plane increases to 59% following octanol directional adsorption. Moreover, microfluidic field measurements demonstrate that the microchannel enhances mass transfer to facilitate octanol directional transmission and hydrogen bond adsorption within the sol droplet. This approach ultimately enables integrated reshaping of alumina microspheres with a 2.7-fold increase in the γ-Al 2 O 3 (100) plane exposure. This study provides an effective operational paradigm for achieving support crystal plane exposure in industrial applications.
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高影响因子
Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Ye Wang,Wenzhong Yang,Xiaoshuang Yin,Ying Liu
Comparative ozonation experiments were carried out to investigate the catalytic ability and mechanism of γ-Al 2 O 3 supported manganese oxide (Mn/γ-Al 2 O 3 ) for the degradation of phenol in aqueous solution. The results showed that 4% Mn/γ-Al 2 O 3 possessed highest catalytic efficiency for the ozonation of phenol than that of other catalysts. The influences of manganese content and catalyst dosage verified that surface hydroxyl groups affected by the solution pH and the point of zero charge (pH PZC ) of catalysts. The Mn/γ-Al 2 O 3 exerted the strongest catalytic activity at initial solution pH of 3.45. The strong interaction between ozone and Mn/γ-Al 2 O 3 was observed and confirmed as a critical step for the catalysis reaction. The surface hydroxyl groups and chemisorbed water acted as the active sites in promoting hydroxyl radicals, while Brönsted acid sites were confirmed as reactive centres for catalytic ozonation in the aqueous phase. The influence of tert -butanol showed that hydroxyl radicals and active oxygen species were involved in the catalytic ozonation of phenol. According to the X-ray photoelectron spectroscopy (XPS) results, the enhancement of electron transfer on the surface manganese oxides were responsible for the catalysis and promoting the formation of active oxygen species. A possible catalytic ozonation mechanism of phenol over Mn/γ-Al 2 O 3 was proposed.
研究领域:
环境科学
·
催化化学
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DOI
RSC Advances
·
2021
·Vol. 11
·期 39
·24144-24155
·
IF 3.361
Xingdong Yang,Jiyan Qu,Linxi Wang,Jianhong Luo
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）