Journal of Energy Storage
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2024
·
IF 8.9
Zhu-yu Li,Sheng Li,Le-ran Li,Qi Niu,Kai Li,Bin Hu,Qiang Lu
Thermochemical energy storage can overcome the drawbacks such as instantaneity, instability, and the incongruity between supply- and demand-side in the utilization of renewable energy. CaCO 3 /CaO is regarded as a promising material for thermochemical energy storage, whereas its stability still requires urgent improvement. In this paper, a new Al 2 O 3 and SiO 2 co-doped calcium-based material derived from eggshell (ES) was prepared for efficient heat storage. The physicochemical properties of synthesized materials were systematically analyzed. The regulation mechanisms of Al 2 O 3 and SiO 2 additions on the cyclic characteristics of heat storage materials were investigated by a thermogravimetric analyzer. The results displayed that ESCa-2.5Si2.5Al, prepared with a mass ratio of ES: Al 2 O 3 : SiO 2 = 95: 2.5: 2.5, demonstrated outstanding specific surface area of 14.64 m 2 /g and pore volume of 0.080 cm 3 /g, which were 2.74 and 5 times greater than those of ES-based CaO (ESCa), respectively. Meanwhile, SiO 2 and Al 2 O 3 could react with CaO to form Ca 3 Al 2 O 6 and Ca 2 SiO 4 , their synergistic effect could efficiently improve the sintering resistance of CaO. Therefore, ESCa-2.5Si2.5Al possessed excellent cyclic stability. Its initial energy storage density was 2273.19 kJ/kg, and the retention ratio reached 72.93 % after 20 cycles, significantly higher than that of ESCa (19.35 %). In addition, compared with ESCa, the heat storage temperature of ESCa-2.5Si2.5Al decreased from 792 °C to 778 °C, and its carbonation rate only slightly attenuated over 20 cycles, enabling rapid heat storage at lower temperatures and stable heat release.
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RSC Advances
·
2017
·Vol. 7
·期 41
·25746-25752
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IF 3.108
Li Xu,Qin Xu,Xiaoyu Guo,Ye Ying,Yiping Wu,Ying Wen,Haifeng Yang
Alumina is widely recognized as chemically inert, and resistant to oxidation and high temperature. In this study, Au/Al2O3 nanocomposites (NCs) were prepared by a facile method and were used as a surface enhanced Raman scattering (SERS) substrate for detection of adenosine triphosphate (ATP). This Au/Al2O3-based SERS substrate demonstrated good sensitivity with the lowest detectable concentration of 5 × 10−9 M for ATP and a good linear relationship ranging from 5 × 10−5 to 5 × 10−9 M. The strategy of improvement of SERS detection sensitivity for ATP was based on the consideration of ATP captured by such SERS substrate via chelation of aluminum and phosphates, which was validated by X-ray photoelectron spectroscopy. In addition, alumina as a supporting material could be expected to prolong the stability of such a SERS substrate.
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MOLECULES
·
2024
·Vol. 29
·期 13
·2959
·
IF 4.2
Hejingying Niu,Jinhua Ma,Lina Gan,Kezhi Li
In this study, a PtSn/Al2O3catalyst with bimetallic uniform distribution in the sphere was synthesized. The PDH performance and characterization analyses, such as with FTIR, XPS, and NH3-TPD, were investigated. The effects of acid on the PDH performance were analyzed. Citric acid (CA) acted as a competing adsorbent in the preparation process of the PtSn/Al2O3catalyst to synthesize the uniform catalyst. Water washing and alkali-treated samples were also studied. SEM line scanning revealed that increased the apparent concentration of Pt metal from 0.23 to 0.30 with citric acid. In contrast to the fresh PtSn/Al2O3catalyst, the addition of citric acid increased the PDH selectivity from 74% to 93%. After alkali or water washing treatments, the catalyst’s selectivity further increased to 96%. Strong acid sites promoted the breaking of C–C bonds during the PDH reaction, resulting in more methane and ethylene byproducts, and decreased catalyst selectivity for fresh PtSn/Al2O3. From the PDH reaction thermodynamic analysis, a relatively sub-atmospheric pressure environment with a lower propane pressure could be the reasonable choice.
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PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 8
·1057
·
IF 2.9
Senhua Ke,Chenyue Mao,Ruiqing Luo,Zeren Zhou,Yongming Hu,Wei Zhao,Wanping Chen
With a band gap of 2.4 eV, CdS has been extensively explored for photocatalytic applications under visible light irradiation. In this study, CdS nanoparticles have been investigated for the tribocatalytic degradation of concentrated Rhodamine B (RhB) and methyl orange (MO) solutions. For CdS nanoparticles in a glass beaker, 78.9% of 50 mg/L RhB and 69.8% of 20 mg/L MO solutions were degraded after 8 h and 24 h of magnetic stirring using Teflon magnetic rotary disks, respectively. While for CdS nanoparticles in a beaker with Al2O3coated on its bottom, 99.8% of the RhB solution was degraded after 8 h of magnetic stirring and 95.6% of the MO solution was degraded after 12 h of magnetic stirring. Moreover, another contrast was observed between the two beaker bottoms—a new peak at 250 nm in UV–visible absorption spectra was only observed for the MO degradation by CdS in the as-received glass beaker, which indicates that MO molecules were only broken into smaller organic molecules in that case. These findings are meaningful for expanding the catalytic applications of CdS and for achieving a better understanding of tribocatalysis as well.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Liping Zhang,Huitong Li,Mengnan Duan,Weiwei Wang,Ran Mu,Zehua Pi,Yubin Shang
Coking reverse osmosis concentrates (ROCs) are characterized by a high organic content, complex composition, and difficulty in biological degradation. To achieve the zero liquid discharge (ZLD) strategy, ROCs need to be treated urgently. This work aims to prepare a modified catalyst under high-efficiency activated alumina (γ-Al 2 O 3 ) loaded with Fe and Co bimetals and to degrade m-cresol as a typical pollutant in actual coking ROCs. The results showed that Fe and Co metals were successfully loaded. Meanwhile, the catalyst enhances the reactive active sites, reduces the activation energy of the reaction, and improves the degradation efficiency. The degradation mechanism and removal process were investigated. The results showed that with the optimal conditions, as ozone dosage of 50 mg/L, gas flow rate of 400 mL/min, catalyst dosage of 30 g/L, and pH value of 9, the removal rates of COD, TOC, and UV 254 were 75.61 %, 56.22 %, and 84.14 %, respectively. This study provides a better treatment option for the degradation of m-cresols in coking ROCs.
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Molecular Catalysis
·
2024
·
IF 3.9
Yanni Liu,Yajing Cai,Zhoujie Liang,Guojie Zhang,Jun Liu,Yunfei Zhang,Tianshan Li,Xiaodi Zhang,Ying Wang,Yuqiong Zhao
Dry reforming of methane (DRM) is a novel technology that enables the direct utilization of greenhouse gases (CH 4 and CO 2 ) for the production of value-added products. In the DRM reaction, the acid-base characteristics of the catalyst support play a pivotal role in determining the performance of the catalyst. In this study, a series of Co-based catalysts with different alkali earth metal-modified Al 2 O 3 composite supports, specifically m-Al 2 O 3 (m=Ca, Mg, and Ba), were prepared using the impregnation method. Various characterization techniques were employed to investigate the impact of alkaline site modulation on the support surface with respect to anti-sintering and anti-coking properties. The results demonstrate that the m-Al 2 O 3 composite support catalysts, prepared with Mg and Ca modulation, exhibit an abundance of basic sites and oxygen vacancies. This promotes the adsorption and activation of CO 2 , enhances the rate of carbon elimination, and effectively addresses carbon deposition and metal sintering issues. Notably, the CoLa/Mg-Al 2 O 3 catalyst shows the highest performance under reaction conditions of 750 °C, with CH 4 and CO 2 conversions reaching 92.3 % and 97.5 %, respectively. On the other hand, the CoLa/Ba-Al 2 O 3 catalysts display poor performance in dry reforming. Kinetic studies indicate that CoLa/Mg-Al 2 O 3 catalyst significantly reduce the apparent activation energy required for CH 4 and CO 2 cracking. Furthermore, it is demonstrated that the introduction of alkali earth metals can promote the dissociation of CH 4 and CO 2 .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Haoyu Yan,Peng Wang,Pu Huang,Cheng Shen,Jian Sun,Tao Song
Ammonia (NH 3 ) is widely recognized as a carbon-free hydrogen carrier with high energy density, making it a promising energy vector for sustainable energy systems. However, its efficient storage and release remain technical challenges. In this study, the low-temperature NH 3 adsorption-desorption performance of four pure metal chlorides (CaCl 2 , MgCl 2 , MnCl 2 , and CuCl 2 ) was systematically evaluated. Among them, CuCl 2 and MnCl 2 exhibited superior NH 3 uptake capacities, but also suffered from volume expansion and particle agglomeration during repeated cycling. To overcome these limitations, composite sorbent pellets were developed by supporting metal chlorides on Al 2 O 3 via a graphite-casting method. The resulting CuCl 2 -based composite pellet achieved an optimized balance of high NH 3 adsorption capacity (∼ 0.36 g NH 3 /g), excellent regeneration efficiency (> 96 %), and adequate mechanical strength. Excessive CuCl 2 loading reduced both regeneration efficiency and mechanical stability, while lower loading enhanced active phase dispersion and sorbent performance. 30 wt% CuCl 2 offered the best performance in terms of adsorption, regeneration, and structural durability. Additionally, the optimized Cu 30 -Al-C sorbent maintained stable NH 3 adsorption capacity over 20 cycles, confirming excellent reusability. The enhanced performance was attributed to the synergistic effects of Al 2 O 3 support and the hydrophobic nature of the graphite-casting process, which enabled uniform distribution of active compound and mitigated structural deterioration during cycling. These results demonstrate the feasibility of graphite-casted, Al 2 O 3 -supported metal chlorides as structurally stable and regenerable NH 3 sorbents for low-temperature ammonia storage applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 24
·1-12
·
IF 2.8
Zhang Xuemei,Qu Can,Li Yiyang,Kang Yuting,Pu Linyu,Huang Xu,Liu Jingsong
A new type of glass/ Al 2 O 3 ceramic composite material was prepared by the conventional solid-state method for lead-free low-softening ZnO-B 2 O 3 -SiO 2 (ZBS) glass. The effects of glass content and sintering temperature on the phase structure, sintering performance, microstructure, dielectric properties, thermal properties and mechanical properties of the composite materials were investigated by adding different mass fractions of ZnO-B 2 O 3 -SiO 2 glass into Al 2 O 3 ceramics. The results show that the doped ZnO-B 2 O 3 -SiO 2 glass effectively reduced the sintering temperature of Al 2 O 3 ceramics, and the sintering aid ZnO-B 2 O 3 -SiO 2 glass had no crystalline phase. The ZBS/ Al 2 O 3 composites sintered at 875–925 ℃ mainly contain two crystalline phases, ZnAl 2 O 4 and Zn 2 SiO 4 , and the content of the phases depended on the composition of the composites and the sintering temperature. When the content of ZnO-B 2 O 3 -SiO 2 glass was 74 wt.%, and the composites were sintered at 875 ℃ for 1 h, the volume density of the composites was 3.49 g/cm 3 , the thermal conductivity λ was 1.46W/mK, the thermal expansion coefficient CTE was 5.52/ppm ℃, the flexural strength was 155 MPa, the relative dielectric constant was 6.28, and the dielectric loss was 0.937 × 10 −3 (@12.571 GHz). The dielectric properties are the best, and it has a good application prospect in LTCC at high frequencies.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Huijuan Zou,Weibing Zhang,Qihuang Wu,Taici Huang,Wei Xu,Xinxin Xi,Yanling Cheng,Huatay Lin
In this study, a series of hierarchical porous Al 2 O 3 with controlled morphology were synthesized using melamine foam (MF) as a sacrificial template. Comprehensive characterization through XRD, FTIR, Raman spectra, SEM, TEM, and N 2 adsorption-desorption confirmed the successful fabrication of graphite skeleton-guided hierarchical porousAl 2 O 3 by precise control of calcination temperature. The hierarchical porous Al 2 O 3 materials calcined at 1000 ℃,1400 ℃, and 1500 ℃ demonstrated unique structural features and higher positive Zeta potential, exhibiting remarkably fast adsorption kinetics and exceptional Congo red (CR) adsorption capacities that significantly surpassed previously reported values in literature. The adsorption process followed pseudo-second-order kinetics, indicating chemisorption as the dominant mechanism. Furthermore, the adsorption isotherm was best described by the Langmuir model, suggesting monolayer adsorption behavior. These findings demonstrate that our cost-effectively fabricated hierarchical porous Al 2 O 3 represents a highly promising adsorbent for efficient removal of organic dyes from wastewater.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xingchen Dong,Ying Wang,Haoyu Wang,Jiaqing Xu,Fan Zhang,Yuanrong Yang,Zunfei Ma,Shuo Zhang,Lina Sui,Zhixing Gan,Lifeng Dong,Liyan Yu
The combination of solar water evaporation and hydrovoltaic effect (HVE) provides an effective way to solve the crisis of water shortage and fossil fuel pollution. However, they are still facing challenges of the low output power, slow water evaporation, and high salt accumulation. Here, we design a three-dimensional (3D) Al2O3-decorated graphene aerogel (AGA) that can effectively collect fresh water and electricity simultaneously. The AGA prepared by freeze-drying method has vertical channels, a loose porous structure, and strong hydrophilicity. Moreover, the hydrated ions introduced by Al2O3 lead to strong zeta potential in the channel, thereby resulting in excellent electricity generation capacity. In seawater, the water evaporation performance reaches 3.03 kg m−2 h−1, meanwhile the maximum output voltage is about 0.76 V with output electrical power density reaching 38 mW·m−2.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Min-Ping Zhu,Jia-Cheng E. Yang,Darren Delai Sun,Baoling Yuan,Ming-Lai Fu
Reported here is a pioneering work on the co-removal of carbamazepine (CBZ) and metronidazole (MNZ) by Co 2 AlO 4 @Al 2 O 3 millispheres activated peroxymonosulfate (PMS). Compared with the single removal, the reduced ratios for the removal kinetics of MNZ (72.16%) are two times higher than that of CBZ (35.41%) within initial pH 3 – 9. This is essentially due to the higher oxidation affinity of SO 4 •– and 1 O 2 toward CBZ than MNZ. Cl − facilitated the degradation of CBZ but inhibited the degradation of MNZ, probably ascribed to the formation of HOCl and Cl 2 •− . HCO 3 − and PO 4 3− significantly inhibited the removal of CBZ and MNZ by scavenging SO 4 •– and/or passivating the active sites of Co 2 AlO 4 @Al 2 O 3 . The degradation of CBZ is mainly due to the electron abstraction and oxygen addition, while the primary oxidation processes of MNZ include the denitration, ring opening and/or N-C cleavage. Because of the competition of CBZ against SO 4 •− , the simultaneous removal process remarkably changed the main products of MNZ compared with the single removal process. The simultaneous removal of CBZ and MNZ increased the total bioaccumulation potential and mutagenicity risk of degradation products but helped to reduce their total developmental toxicity. The products formed in the co-removal process showed higher total acute toxicity to Daphnia magna than those of the single process, while for the total acute toxicity to Oral rat , the results are reversed. This work will spark more interest of simultaneously removing multiple emerging pollutants with monolithic catalysts-oriented oxidation processes.
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Chemical Engineering and Processing-Process Intensification
·
2020
·
IF 3.731
Lan Jiang,Guang-Wen Chu,Ya-Zhao Liu,Wei Liu,Li-Xiong Wen,Yong Luo
A rotating packed bed (RPB) reactor with excellent mass transfer performance can be applied for catalytic reactions. However, the structure of catalyst particles randomly inside the rotor of the RPB reactor was easily deformed under the centrifugal field. In this work, a cordierite (COR) monolithic catalyst with high mechanical strength was prepared, aiming to be used in the RPB reactor for hydrogenation. The acid pretreatment and Al 2 O 3 coating were employed to increase the specific surface area of COR substrate. Active component palladium (Pd) was deposited on Al 2 O 3 /COR. Hydrogenation of α-methylstyrene (AMS) was selected as a model reaction for the RPB reactor with the above Pd/Al 2 O 3 /COR. Experimental results show that the space time yield (STY) in the RPB reactor was effectually enhanced 9.2 times higher than that in the fixed bed reactor at the operation conditions of 30 °C and 0.2 MPa, which shows potential prospects of the RPB reactor with Pd/Al 2 O 3 /COR monolithic catalyst for the process intensification of catalytic reaction.
研究领域:
化学工程
·
催化反应
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