CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chen Zhang,Xin Wang
In this paper, CaO-B 2 O 3 -SiO 2 (CBS) is utilized as matrix material of microwave coating for the first time to achieve high-performance microwave absorption under high-temperature. A series of FeSiAl (FSA)/CBS composite coatings were prepared via atmospheric plasma spraying. The impact of spraying power on the microstructure, electromagnetic properties, and high-temperature stability of as-sprayed coatings were studied. The experimental results reveal that CBS could effectively suppress the formation of the lamellar structure of FSA as the low initial melting temperature, also form unexpected Fe 2 SiO 4 structure with FSA during the spraying process. The increase in complex permittivity of the coating is primarily attributed to enhanced coating density and the development of Fe-rich regions within the CBS matrix. Furthermore, the dense coating prevents the oxidation of FSA and exhibits high-temperature stability. Our coating of 1 mm thickness has a reflection loss below -5 dB with frequency range of 7–14.8 GHz at 500 °C.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2019
·Vol. 66
·期 4
·e16877
·
IF 3.463
Sier Sang,Zhi-Jian Zhao,Hao Tian,Zhao Sun,Hongfang Li,Suttichai Assabumrungrat,Tahir Muhammad,Liang Zeng,Jinlong Gong
This article describes the design and synthesis of MgO-modified Ni/CaO catalysts for sorption-enhanced steam reforming of ethanol. The results show that the introduction of MgO effectively increases the dispersion of CaO via forming MgCa(CO 3 ) 2 precursor. In the prepared MgO-modified Ni/CaO catalysts, metallic Ni exists around MgO supported on CaO. Both 100% ethanol conversion and >96% hydrogen purity can be stabilized in 10 cycles over the catalyst containing 20 wt% MgO. The interaction between metallic Ni and MgO enhances the sintering resistance of the catalyst. More importantly, reaction pathway studies have confirmed that the formation of CaCO 3 hinders the activation of H 2 O on the Ni/CaO catalyst surface, and thus inhibits the conversion of the reaction intermediates including HCO* and CH x *. MgO can dissociate H 2 O to form hydroxyl groups which participate in the conversion of the reaction intermediates, thereby the MgO-modified Ni/CaO catalysts have better catalytic performance and carbon deposition resistance.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
Colloid and Interface Science Communications
·
2023
·
IF 4.5
Lihuan Wang,Feng Gan,Jinpeng Mo,Jing Zhao,Xi Yu,Hui Yu
Rare earth-doped bioactive ceramics are promising biomaterials due to their unique optical properties, biocompatibility, antioxidants, and antibacterial activity. In this study, a series of SiO 2 -CaO-Er 2 O 3 nanofiber mats were fabricated by sol-gel electrospinning. The morphology, flexibility, physicochemical and biological properties of the nanofibers were investigated. The flexibility of the nanofiber mats containing 5 and 10 wt% of Er 2 O 3 was better than that of samples without or with >10 wt% Er 2 O 3 . The chemical property assay indicated that addition of Er can lead to changes in the degree of crystallinity and the degree of silica network polymerization, which further affect the flexibility. Photoluminescent spectra showed that the Er-doped nanofibers exist green and near infrared emissions. The in vitro bio experiments demonstrated that Er-doped nanofibers present excellent biocompatibility, and the mineralization experiment demonstrated that Er-doped nanofibers present favorable mineralization activity. Therefore, these SiO 2 -CaO-Er 2 O 3 flexible nanofibers may be promising candidates for biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Zhongli He,Bing Song,Cai Liang,Bin Liu,Zhirui Ma,Keliang Pang,Jiangang Yang
Concerns about arsenic emission issues are growing as the arsenic discharged from coal-fired power plants seriously endangers the ecological environment and public health. The gas-phase arsenic capture by a CaO–Ca12Al14O33 synthetic sorbent at 1000–1200 °C in the simulated flue gas was conducted, with the influence of the addition ratio of Ca12Al14O33, temperature, retention time, and acid gases NO/SO2 considered in the study. The results indicated that the synthetic sorbent containing 15 wt % Ca12Al14O33 (Ca85Al15) exhibited much better arsenic adsorption performance than CaO, which was ascribed to the greatly strengthened sintering resistance of CaO particles by adding Ca12Al14O33, enabling arsenic adsorption and chemical reactions. Both the increasing temperature and retention time facilitated arsenic adsorption by Ca85Al15, and the hypertoxic arsenic vapor (As3+) was converted into arsenate (Ca3(AsO4)2) with less toxicity. In the presence of NO, the arsenic capture was gradually suppressed with increasing retention time. On the other hand, SO2 could slightly facilitate the capture of arsenic at 1000–1100 °C for 10 min; nevertheless, due to the formation of Ca4Al6O12SO4, the promotion effect was inhibited at a higher temperature and a longer retention time. In general, the study provided a basis for developing highly efficient solid sorbents toward controlling arsenic vapor emission derived from coal combustion, and the appropriate conditions for arsenic capture were at 1000–1100 °C.
研究领域:
环境科学
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材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Haonan Cui,Hongcheng Yang,Hua Wang,Yixuan Zheng,Yuchen Wang,Hongyu Yang,Enzhu Li
CaO-Al 2 O 3 -B 2 O 3 (CAB) glass-ceramics with varying Al 2 O 3 content were fabricated using the melting method including melting and quenching of mixture of raw materials. The obtained glass powder was pressed into the desired shape and sintered for measurement. At 900 °C, the crystallinity initially increased and then decreased with increasing Al 2 O 3 content. The highest crystallinity of 62.29 % was obtained when the Al 2 O 3 content was 0.5 mol%, and exhibited excellent dielectric properties : ε r = 4.35, Q × f = 53,085 GHz, and τ f = –33.95 ppm/°C. The variation of dielectric properties with increasing Al 2 O 3 content is attributed to the crystallinity process. The crystallization process of CAB system was determined by crystallization activation energy , the lowest value of 302.085 kJ/mol corresponds to the highest crystallinity. The crystallization, dielectric properties and sintering behavior of CAB system indicate that CAB system prepared by melting method have promising prospect as new LTCC glass-ceramics.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Azhar Abbas Khosa,J. Yan,C.Y. Zhao
CaCO 3 /CaO based thermochemical energy storage system has a promising potential for the concentrated solar power plants. However, the low reactivity and sintering of CaCO 3 /CaO restricts the energy storage/release performance of this system. In this work, we report ZnO as a new doping material for the CaCO 3 /CaO TCES system. We tested different loadings of ZnO and determined an optimal loading for the best performance. The reaction kinetics of both the doped as well as the undoped system in the decarbonation step is presented in detail. Furthermore, the energy storage capacity and the cyclic stability over first 100 cycles is reported. It is found that the ZnO-doped CaCO 3 can absorb 1478.8 J/g energy at the optimal loading. The cyclic conversion of the ZnO-doped system stabilizes after 20 cycles, which is an improvement from the undoped system that shows a slow but steady decline even after 100 cycles. ZnO seems to be a viable doping material, which considering its low cost and availability can lead to an improved thermochemical energy storage system.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2025
·Vol. 28
·期 8
·113127
·
IF 4.1
Chengzhuang Zhang,Jia Fang,Zhiqiang Han,Peng Chen,Xilong Xu,Kejian Wang,Yunxi Shi,Jianxiong Liao
CaO-based adsorbents present a promising approach for industrial CO 2 emissions reduction. This study systematically investigates the influence of adsorption temperature, adsorbent mass, CO 2 concentration, and flow rate on CO 2 capture efficiency using commercial CaO via thermogravimetric analysis (TGA). Optimal adsorption performance, achieving a capacity of 0.62 g/g and a rate exceeding 0.14 g/g/min, was observed at 750°C, 7 mg mass, 20% CO 2 , and 20 mL/min flow. Characterization (SEM, BET, and FTIR) indicated that 750°C preserved a hierarchical pore structure (24.64 m 2 /g surface area, 0.1026 cm 3 /g pore volume, and 7.08 nm average pore size), mitigating sintering and pore blockage while confining carbonation to surface layers. Kinetic modeling confirmed chemisorption dominance (pseudo-second-order). These findings elucidate fundamental mass/heat transfer limitations, supporting the development of enhanced CaO-based carbon capture, utilization, and storage (CCUS) technologies. Applied sciences; Chemistry; Environmental science.
研究领域:
应用科学
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化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2023
·
IF 7.7
Xianyao Yan,Chenyu Duan,Shuihua Yu,Bing Dai,Chaoying Sun,Huaqiang Chu
The calcium looping is a promising technology to achieve industrial CO 2 capture, and the introduction of oxygen vacancy can promote the CO 2 capture reactivity of CaO-based sorbents. In this work, DFT calculations were performed to investigate the CO 2 adsorption by CaO in the presence of oxygen vacancy defect. The presence of oxygen vacancy reduces the band gap of CaO surface, which results from the delocalization of Ca 2p orbital. Besides, the electron accumulation at the oxygen vacancy occurs due to the unsaturated Ca-O bonds, and the reaction possibility is promoted neighbouring the defect. The top site of oxygen vacancy defect of CaO is favourable for CO 2 adsorption. The adsorption energy of CO 2 on CaO with oxygen vacancy achieves − 2.52 eV, which is 1.81 times as high as that on pristine CaO. Due to strong interaction between CO 2 and CaO with oxygen vacancy, CO 2 migration from this site is more difficult, while the following diffusion is more prone to occur. In the presence of steam, CO 2 adsorption energy is enhanced to − 2.70 eV on CaO with oxygen vacancy, and the distance from CO 2 radical to surface is intuitively reduced, which results from the electrons donated from defect and neighbouring Ca atoms, while CO 2 diffusion difficulty is increased. This work provides an incisive investigation for structural, electronic, and thermodynamic characteristics of CO 2 adsorption and diffusion on CaO in the presence of oxygen vacancy defect, and it can shed light on rational synthesis and functional design of surface-active sites of CaO-based sorbents.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2016
·
IF 3.611
Yingchao Hu,Wenqiang Liu,Hongqiang Chen,Zijian Zhou,Wenyu Wang,Jian Sun,Xinwei Yang,Xian Li,Minghou Xu
A screening of inert solid supports as metal skeletons of CaO-based sorbents was conducted in this work, aiming to provide the basis and guideline for the selection of inert solid refractories to produce high temperature CO 2 capture sorbent. We studied 12 different refractories including Al-, Ti-, Mn-, Mg-, Y-, Si-, La-, Zr-, Ce-, Nd-, Pr- and Yb-based supports, among which Yb and Pr are newly introduced ones. The sorbents were synthesized using the same wet-mixing method, by which the inert supports could be well dispersed among the ultra-fine active specie of CaO/CaCO 3 particles to fully play the role of frameworks for sintering resistance. The sorbents stabilized by these inert supports were also cyclically tested under the same conditions. Y- and Al-based supports were found to exhibit much superior cyclic performance than the other supports. Mn-, Mg-, La-, Yb- and Nd-based supports are also good candidates, whereas the other ones containing Ti-, Ce-, Zr-, Si- and Pr-based supports show less effectiveness. The melting point of the inert support and surface area of the synthetic sorbents are found to be the key factors to affect the sorbent performance.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Caili Li,Yingjie Li,Yi Fang,Chunxiao Zhang,Yu Ren
CaO-CaCO 3 thermochemical energy storage is a promising technology for solar energy utilization and storage. Alkaline papermaking waste (APW) from paper mills, which is mainly composed of CaCO 3 . Herein, TiO 2 /MnFe 2 O 4 co-modified APW was synthesized. The energy storage capacity of TiO 2 /MnFe 2 O 4 co-modified APW was studied during CaO-CaCO 3 thermochemical energy storage cycles in a duel fixed bed reactor. TiO 2 /MnFe 2 O 4 co-modified APW mainly consists of CaO, MgO, CaTiO 3 , CaMnO 3 , and Ca 2 Fe 2 O 5 . The introductions of TiO 2 and MnFe 2 O 4 significantly improve the cyclic stability and optical absorption property of APW in 30 cycles. The co-modified APW (the mass ratio for CaO:TiO 2 :MnFe 2 O 4 = 100:5:5) possesses high sintering resistance, energy storage, and optical absorption capacities in 30 cycles. The energy storage conversion and capacity of the co-modified APW are 0.72 and 2288.57 kJ/kg after 30 cycles, respectively. The optical absorptance of the co-modified APW reaches 49%, which is 9.25 times as high as that of APW. CaTiO 3 and CaMnO 3 effectively mitigate the sintering of CaO grains. CaMnO 3 and Ca 2 Fe 2 O 5 significantly increase the optical absorptance of APW. The co-modified APW possesses stronger basicity and more oxygen vacancies, which is favourable for the carbonation reaction. Thus, TiO 2 /MnFe 2 O 4 co-modified APW is a good energy storage material.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yaqi Duan,Conghao Ku,Yuping Lv,Yantao Wang,Weiran Yang
Due to its unique physical and chemical properties, applying activated carbon nanomaterials as catalysts gradually become a hot research topic. Herein, the synergistic catalytic effect of activated carbon nanoparticles and CaO for highly selective oxidation of levulinic acid to citramalic acid was first reported. Among various activated carbons tested (commercially available and biomass-derived), the one obtained from Nanjing Chemical Reagent Co., Ltd. exhibits the best catalytic activity due to its large surface area, suitable pore structure, abundant active sites, and excellent O 2 activation ability. The levulinic acid conversion and citramalic acid selectivity respectively reached 100 % and 82.8 % at 90 °C for 0.5 h under 0.5 Mpa O 2 . Further, the 3D flower-like CaO/carbon composite (CaO/CF) was developed, which also showed excellent catalytic activity for the selective oxidation of levulinic acid to citramalic acid, with 91 % levulinic acid conversion and 81.8 % citramalic acid selectivity under otherwise the same reaction condition. The mechanistic study indicated that superoxide anion radical ( O 2 – ), Ca 2+ and OH – all play a crucial role in levulinic acid oxidation. This work may promote the application of activated carbon nanomaterial as an effective catalyst for selective oxidation reactions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2021
·
IF 7.147
T.X. Xu,X.K. Tian,A.A. Khosa,J. Yan,Q. Ye,C.Y. Zhao
The CaCO 3 /CaO reversible reaction pair is a promising thermochemical energy storage (TCES) technology for concentrating solar power (CSP) plants. However, the reaction performance and cyclic stability of this reaction pair is compromised because of sintering. In this study, TiO 2 -doped in CaCO 3 /CaO TCES system are systematically investigated by synchronous thermal analyzer (STA). The reaction kinetics of decarbonation process with and without TiO 2 doping are compared in N 2 and CO 2 atmospheres. Furthermore, the performance of CaCO 3 /CaO TCES system is analyzed in a fixed-bed reactor for future application. It is found that doping TiO 2 can improve the anti-sintering ability and cyclic stability of CaCO 3 , and the optimal doping ratio is 2.5 mol %, whose energy storage density is 1256.68 kJ/kg sample at first and improved by 2.26 times after 30 cycles. Moreover, doping TiO 2 decreases the activation energy and initial decarbonation temperature in CO 2 atmospheres. In exothermic experiments of fixed-bed reactor, the maximum exothermic temperature difference is 309.83 °C at 550 °C, and the highest absolute temperature reaches 848.7 °C at 750 °C. TiO 2 dopant promotes the decarbonation at lower temperature, and obtains a higher overall conversion (0.506) at 850 °C. Overall, CaCO 3 with TiO 2 dopant is of great significance for future industrial and commercial applications.
研究领域:
能源材料
·
太阳能技术
✓ 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）