SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haiming Gu,Xuxing Shen,Minyu Yu,Miaomiao Niu,Shanhui Zhao,Siwen Zhang,Xiaolong Bi,Yadong Yu,Mofei Zhong,Lianggan Guan
Sorbent looping dry reforming of methane (SLDRM) represents a promising approach for CO 2 emission reduction and resource utilization, with its advancement hinging on the development of dual functional materials (DFMs) capable of simultaneous CO 2 capture and catalytic methane conversion. In this study, CaO-Ni based DFMs supported on various materials were synthesized via sol–gel method and characterized using SEM, XRD and TGA. Isothermal SLDRM experiments were performed in a fixed bed to evaluate the performance of these materials. Initial screening of support materials revealed that CH 4 conversion activity followed the order: CeO 2 >Al 2 O 3 >La 2 O 3 >MgO ≈ Y 2 O 3 , with CeO 2 emerging as the optimal support due to its superior performance. The synergistic effect of the Ni catalyst and CH 4 atmosphere significantly enhanced low-temperature decarbonization of the sorbent, mitigating sintering and enhancing cyclic CO 2 capture capacity. In-situ CO 2 conversion during CH 4 reforming disrupted the decarbonization reaction equilibrium, enabling efficient isothermal CO 2 capture and decarbonation. Ni decoration significantly enhanced CH 4 conversion, increasing from nearly 0% without Ni to 87% at 10% Ni loading, while higher loadings provided only marginal improvements. Although an increase in reaction temperature enhanced CH 4 conversion, it also increased CO 2 partial pressure, promoting the reverse water gas shift reaction and resulting in a H 2 /CO ratio below 1 when the temperature exceeded 650°C. Stability tests over 10 consecutive SLDRM cycles demonstrated good stability of CaO-10Ni/CeO 2 , maintaining a CH 4 conversion efficiency of 87% and a stable H 2 /CO ratio of approximately 1 at 650°C. Carbon deposition during the CH 4 step was effectively removed during carbonation, as confirmed by Raman spectroscopy, while SEM and XRD analyses revealed preserved surface morphology and phase composition. These findings highlight the excellent reactivity and stability of CaO-10Ni/CeO 2 , positioning it as a highly promising candidate for advancing CO 2 emission reduction and resource utilization strategies.
研究领域:
化学工程
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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
BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-15
·
IF 0
Guo J.,Ma Yu L.,Yu Jia Y.,Gao Yu J.,Ma Ning X.,Wu Xiao Y.
Herein, 2-(2-methoxyphenoxy)-1-phenylethanol (β- O -4), 2-methoxyphenyl anisole (α- O -4) and 4-phenoxyphenol (4- O -5) were selected as typical lignin model compounds. Given the effectiveness of traditional acid–base catalysts for lignin depolymerisation, a novel Ni/CaO–H-ZSM-5(60) catalyst was prepared to investigate the difficulty level of C–O bond of three model compounds cleavage in ethanol. It was observed that Ni/CaO–H-ZSM-5(60) had prominent performance on the C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ). Among them, the C–O bond of α- O -4 and β- O -4 could be completely cleaved within 60 min. Although the C–O bond of 4- O -5 had high bond energy, 41.2% of conversion was occurred in 60 min. The introduction of CaO could regulate the acidity of H-ZSM-5 to enhance the ability to break C–O bonds. Moreover, the possible pathways of C–O ether bonds in three lignin model compounds cleavage were proposed in order to selectively obtain target products from the raw lignin degradation.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
SOLID STATE SCIENCES
·
2021
·
IF 3.059
Dandan Zhang,Xiuli Zhang,Xingjia Li,Zhu Liang,Haisheng Xu,Zhaoyue Lv,Xiaodong Sang,Saisai Li
In recent years, compared with traditional refrigeration technology, the electrocaloric refrigeration technology has been applied in variety of green cooling devices due to its high efficiency and environmentally friendly. Recent findings reveal that the ceramic system with additives (such as, LiBiO 2 , PbO) can create large ECE under low electric field. In this work, the ternary glass BaO–CaO–SiO 2 (BCS) was used as a sintering aid to enhance the electrocaloric (EC) response of 0.2Ba(Ti 0.9 Sn 0.1 )O 3 -0.8Ba(Zr 0.18 Ti 0.82 )O 3 (BZSnT20) bulk ceramics. The EC properties of BZSnT20 could be also improved via controlling sintering temperature and the content of BCS sintering aid. It was found that BZSnT20 with 0.5 wt% BCS show the maximum EC response of 3.2 K under 7 MV/m with sintering temperature of 1262 °C. These results demonstrated that the ECE of BZSnT20 can be boosted by using appropriate additives, which provides an effective route to realize large ECE under low electric fields.
研究领域:
材料科学
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功能陶瓷
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固态制冷
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电介质物理
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无铅压电材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yafei Guo,Guodong Wang,Jun Yu,Pu Huang,Jian Sun,Ruilin Wang,Tao Wang,Chuanwen Zhao
Transition metal oxides (TMOs) doping is proposed as one effective strategy to improve CO 2 capture and conversion performance of Ni-CaO dual function materials (DFMs). The effect of single and binary TMOs doping on structure–property-activity relationships of Ni-CaO DFMs for integrated CO 2 capture and in-situ reverse water gas shift (RWGS) is investigated. ZrO 2 doping enhances the surface basicity and reducibility of Ni-CaO DFMs for improved CO 2 uptakes and reinforced catalytic activity. ZrO 2 doping also endows Ni-CaO DFMs with improved working stability by forming CaZrO 3 solid solution, which acts as physical barrier to retard the agglomeration and sintering of CaO and NiO species. Doping binary metal oxides of ZrO 2 -CeO 2 further boosts the oxygen vacancy concentration in the DFMs for promoted CO 2 activation and conversion and stabilized CO yield. The desired Ni-CaO-6ZrO 2 -6CeO 2 DFMs shows a higher CO 2 conversion of 72.1% and a lower decay rate of 12.0% for CO yield in consecutive cycles.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Jida Wang,Zhangshuai Ding,Feng Shi,Yifei Chen,Defa Hou,Fulin Yang,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng,Yunwu Zheng
An efficient and highly selective CaO-MgO-promoting γ-Al 2 O 3 decarboxylation catalyst was fabricated with different CaO to MgO ratios via a ball-milling method for regulating product distribution and production of gasoline-kerosene-diesel hydrocarbons via the catalytic copyrolysis of oleic acid (OA) and methanol under hydrogen-generating conditions. In addition, influencing factors, reaction mechanisms, possible reaction pathways and deactivation mechanisms were probed. The results showed that combining Ca, Mg and AlOx was vital for boosting oleic acid conversion, and synergy between metal and acid active sites via strong metal-support interactions enhanced deoxygenation-cracking activity. High-alkalinity CaO boosted C-C/C C bond cleavage, and MgO provided medium-strength Lewis acid sites; additionally, a large BET surface area and mesopore volume suppressed excessive hydrocracking reactions, improving biogasoline yield. Methanol addition provided active hydrogen atoms to enhance biogasoline selectivity at the expense of diesel and heavy oil production via olefinic cycles and aromatic cycle mechanisms and reduced coke deposition. The maximum hydrocarbon and biogasoline yields of 94.53% and 57.59% were achieved at OA/methanol= 5:1 and pyrolysis/catalytic temperature= 450/500 °C with1 g catalyst at a feedstock input rate of 0.1 ml/min.
研究领域:
能源化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biomaterials and Tissue Engineering
·
2014
·Vol. 4
·期 12
·1047-1053
·
IF 1.167
Wu Gang,Huang Chao,Li Hong,Ke Yu,Fang Guan-Yu,He Jia-Zhi,Wang Si-Han,Chunlin Deng
In this study, PEG–CaO–SiO2–P2O5 hybrid materials were synthesized by the triethosysilane-propyl end caped polyethylene glycol (PEG), teraethylorthosilicate (TEOS), triethyl phosphate and calcium nitrate tetrahydrate using a two-step
method. The telechelic PEG was first synthesized by the reaction of PEG with isocyanatopropyl triethoxysilane (IPTS). Then, PEG–CaO–SiO2–P2O5 hybrid materials were synthesized by using sol–gel method. Transmission electron microscopy
(TEM) revealed that the phase structure of the hybrid material changed from organic dominated to inorganic dominated when the PEG content decreased. The size of the dispersed phase is about several microns observed by TEM. Bioactivity tests employed by soaking the specimen in simulated body
fluid (SBF) indicated that hydrophilic polymer contents have no adverse effect on the hydroxyapatite formation. After soaking the hybrid samples in SBF for 2 days, the deposition with the characteristic diffraction peaks of hydroxyapatite was presented on the hybrid material. It's also noticed
the deposition amounts increased with the inorganic contents increasing in the hybrid materials. Mechanical tests displayed no brittle cracks were developed in all the hybrid material samples. The compressive strength of the hybrid materials increased while the elastic deformation decreased
with the polymer contents reduction in the hybrid materials.
研究领域:
生物医学工程
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材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sheng-Jin He,Jia-Pei Chen,Wei-Ming Guo,Xiu-Bing Chen,Huan Zhou,Chuang-Tian Zhan,Shi-Kuan Sun,Yun Li,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
In this study, CaO–Al 2 O 3 –MgO–SiO 2 glass was utilized to join SiC after surface polishing and etching, without the application of pressure. To join polished SiC at 1250 °C using CaO–Al 2 O 3 –MgO–SiO 2 glass proved unsuccessful. However, when polished SiC was joined at 1350 °C, the joint shear strength was 108.0 ± 15.5 MPa. Etching polished SiC with a NaOH–K 3 [Fe(CN) 6 ] solution effectively removed surface carbon, resulting in numerous micro-pits, that increased the joining area and improved the wettability of CaO–Al 2 O 3 –MgO–SiO 2 glass. The joint strengths of etched SiC joined at 1250 °C and 1350 °C were 29.0 ± 11.6 MPa and 125.1 ± 19.6 MPa, respectively. After ablation at 1200 °C for 10 min, the retained strength of the etched joints (joined at 1350 °C) was 61.9 ± 4.0 MPa, whereas the strength of the polished joints decreased to only 36.6 ± 10.7 MPa. Surface etching demonstrates the potential to significantly enhance the strength and high-temperature resistance of SiC joints.
研究领域:
材料科学
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陶瓷工程
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26655-26665
·
IF 2.478
Yang Chengyu,Li Junkai,Lu Yang,Shan Yiting,Xian Qianqian,Zhou Hongqing
CaO-B 2 O 3 -SiO 2 (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na 2 O and K 2 O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO 3 and CaB 2 O 4 , and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na 2 O and K 2 O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na 2 O + K 2 O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm 3 , ε r = 5.94 and tan δ = 1.22 × 10 −3 at 10 GHz.
研究领域:
材料科学
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陶瓷学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2024
·Vol. 16
·期 2
·890
·
IF 3.3
Miao Tian,Qiongqiong Wang,Songsong Wang,Xingbang Wan,Qinmeng Wang,Xueyi Guo
Waste electrical and electronic equipment (WEEE) contains various valuable metals, making it a potential secondary resource for sustainable metal usage. Pyrometallurgical smelting is an efficient technique to recycle WEEE by extracting precious metals into copper matte and removing impurities into slags. The impact of WEEE impurities such as CaO and Al2O3on the phase compositions of the smelting products attracts great attention for industrial metal recovery. This study clarified the impact of CaO and Al2O3on the equilibrium phase compositions of copper matte and SiO2-saturated FeOx-SiO2-Al2O3-CaO slags. The high-temperature smelting experiments were taken at a controlled p(SO2) of 0.1 atm and 1300 °C, followed by quenching and electron probe microanalysis. The results showed that the copper and sulfur in the smelting system were highly deported into copper matte, and their distribution in matte was enhanced by increasing CaO and Al2O3concentrations introduced by WEEE. The chemical copper dissolution in slags increased with increasing matte grade but decreased by adding CaO and Al2O3. The iron was preferentially concentrated in slags, and higher matte grades improved the iron distribution in slags. The current experimental results enrich fundamental thermodynamic data and help optimize WEEE smelting operations for efficient recovery of valuable metals.
研究领域:
冶金学
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环境工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3462-3470
·
IF 9.931
Rui Han,Jihui Gao,Siyu Wei,Yanlin Su,Yukun Qin
High-temperature sorption of CO2via calcium looping is a promising technology for the implementation of carbon capture and storage (CCS). However, the major drawback of this technology is the rapid deactivation of CaO sorbents due to sintering. Here, a facile and cost-effective limited-space metal organic chemical vapor deposition approach is proposed to develop CaO-based sorbents exhibiting a very high and cyclically stable CO2 uptake. The TEM results show that Al2O3 nanoparticles (4–8 nm) are uniformly coated onto CaO crystalline grains, thus effectively inhibiting the sintering of sorbents. After 20 severe cycles, the synthetic sorbent, stabilized by 10 mol% Al2O3, exceeded the CO2 uptake of the benchmark CaO by more than 300%. Furthermore, the influence of Ca-based precursors on the synthetic sorbent's cyclic CO2 uptake was established. The result shows that the sorbents synthesized from different Ca-based precursors all demonstrate high cycling stability, which means that low-cost and high-performance sorbents can be synthesized through selecting a low-cost Ca precursor, such as CaCO3.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junmiao Yu,Xiaoxia Yang,Changkai Wang,Mingxia Huang,Butera Hassan,Zhihong Yang,Xizhu Yang,Bin Huang,Xuejun Pan
This paper integrated alkai-dried sewage sludge (SS) using calcium oxide (CaO) and bagasse (BA) with a two-stage sorption-enhanced steam gasification (SESG) process to separately generate high-purity H 2 and CO at different temperature regions, while exploring optimal conditions and coupling mechanism. Response surface experiment revealed that SS and BA exerted opposing effects on H 2 and CO production, highlighting the importance of balancing their mass ratio. Increasing CaO dosage and H 2 and CO-generation stages temperatures enhanced H 2 and CO production. The optimal conditions were identified as a CaO dosage of 1.2, with temperatures of 600 °C and 750 °C for H 2 and CO-generation stages, considering cost and energy efficiency. With the optimal CaO and BA dosage, the moisture of SS reduced from 80 % to below 40 % within 3h, enabling low-energy dewatering. During H 2 -generation stage (600 °C), residual moisture and Ca(OH) 2 in the dried SS generated in-situ steam promoting steam reforming reactions, and Ca(OH) 2 has more CO 2 sorption capacity than CaO and catalytic effect of cyclization and dehydrogenation of generated tar, to boost H 2 production. During CO-generation stage (750 °C), CaCO 3 released CO 2 to gasify char, improving CO production. The process produced 113.5 mL/g dry biomass of H 2 with 74.1 vol% purity during H 2 -generation stage and 113.3 mL/g dry biomass of CO with 59.8 vol% purity during CO-generation stage. This paper proposed a new approach for drying and resource utilization of SS for inherently separated generation of high-purity H 2 and CO, providing a more sustainable and resource-efficient process.
研究领域:
能源工程
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2003-2011
·
IF 1.637
Hua Rui,Li He,Liu Xiao-Qin,Liu Ding-Hua
With an increasing demand for green chemistry and sustainable development, it is needed to design a solid base with high catalytic activity, excellent stability and reusability. In this work, a new kind of magnetic solid basic catalyst KF/CaO–CoFe 2 O 4 was prepared by the method including co-precipitation and isochoric impregnation, and it was successfully applied in the preparation of polycarbonate diol (PCDL) from the transesterification of 1,4-butanediol with dimethyl carbonate. The characteristics and properties of the catalyst were examined and analyzed by XRD, TEM, CO 2 -TPD and VSM. The effects of various parameters such as shell-core mole ratio, KF loading, calcination temperature, catalyst dosage, and the mole ratio of the raw materials on the yield of PCDL were investigated and the yield of PCDL can reach to 71.2% under the optimal reaction conditions. In addition, the catalyst can be easily separated by an external magnet after reaction, and the catalytic activity of the catalyst can well be maintained for 4 cycles.
研究领域:
化学工程
·
材料科学
·
催化
·
绿色化学
✓ 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）