INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Ziyuan Li,Mingsheng Luo,Zihan Xu,Lingxin Chen,Yuanyuan Fang,Hao Sun,Minwei Yi,Yutong Liu,Yiduo Huo,Roshni Rahman
In this study, in situ assembled MOFs on Al2O3-supported catalysts were prepared to compare with the traditional Al2O3-supported catalysts promoted with Ga and Mo for CO2 hydrogenation to methanol reaction. Among supported catalysts, the 5%MoZnCu/Al2O3 catalyst exhibited the highest CO2 conversion and methanol selectivity, while the 2.5%Mo-modified catalyst demonstrated the best performance among MOF-composited catalysts. MOF compositing can enhance the surface area and pore size of the catalyst, yielding increased CO2 conversion at 230 °C and 3.0 MPa. Meanwhile, Mo modification enhanced the methanol selectivity. Characterization data from XRD, Raman spectroscopy, and BET surface area analysis revealed that the crystal structure, surface morphology, pore structure, and metal valence distribution of the active components were influenced by the metallic promoters. This study provides valuable insights into catalyst development for efficient CO2 hydrogenation to produce methanol.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
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IF 7.664
Mingli Han,Zhicheng Shi,Wenqiang Zhang,Kun Zhang,Huanlei Wang,Davoud Dastan,Runhua Fan
High dielectric permittivity materials are widely employed in various electronic devices. To satisfy the ongoing miniaturization of electronic devices, materials with further enhanced dielectric permittivities are strongly desired. In this work, a novel design of epoxy composites based on Ag/Al 2 O 3 /3D-BaTiO 3 foams with hierarchical heterogeneous microstructures are prepared. It is found that, the spatial distribution of the Ag particles can be easily controlled via adjusting the Ag + /Al 3+ mole ratios, yielding highly tailorable dielectric properties. When the Ag + /Al 3+ mole ratios are low, the Ag particles are well isolated by surrounding Al 2 O 3 , yielding the formation of numerous equivalent micro-capacitors and substantially enhanced dielectric permittivity. Moreover, the dielectric permittivities of the composites increase with higher Ag + /Al 3+ mole ratios. Consequently, a high dielectric permittivity of 160 @10 kHz, which is about 35 times that of the epoxy matrix, is achieved in the composite with a Ag + /Al 3+ mole ratio of 1.8. Meanwhile, a low tangent of about 0.062 is maintained. As the Ag + /Al 3+ mole ratio increases, the Ag particles become interconnected, forming Ag networks. Consequently, a plasma-like negative phenomenon which should be attributed to the plasma oscillation of free electrons in the percolative Ag networks, is observed. This work offers an effective route to design polymer composites with tailorable high permittivity and negative permittivity.
研究领域:
材料科学
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电子工程
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Journal of CO2 Utilization
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2020
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IF 5.993
Chengyi Dai,Xiao Zhao,Borui Hu,Xinbao Zhang,Qunxing Luo,Xinwen Guo,Xiaoxun Ma
Capturing and utilization of carbon dioxide (CO 2 ) not only leads to effective use of carbon resources, but also alleviates environmental pollution caused by increasing concentration of CO 2 , thus making it a hot research topic in recent years. In this study, a series of highly dispersed iron-cobalt (Fe-Co) catalysts was prepared by ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) modification, which could efficiently convert CO 2 into high value-added chemicals (C 2 -C 4 = and C 5 -C 11 ). X-ray diffraction (XRD) analysis showed that the addition of a small amount of Co and EDTA-2Na contributed to enhance the sintering resistance of Fe species. During the calcination process, EDTA 4− can be decomposed into small organic molecules with reducibility, thus promoting the reduction of iron species. The CO temperature-programmed desorption (CO-TPD) results showed that cobalt enhanced the adsorption and activation of intermediate CO on Na x Fe-Co catalyst, thereby promoting the catalytic conversion of CO 2 . The complexation of EDTA promotes the synergistic effect of Fe-Co bimetals, enhances the chemical adsorption of CO 2 . Sodium in EDTA-2Na promotes the surface basicity of the catalysts, which is favored for improving the product distribution of hydrocarbons. At lower H 2 /CO 2 (1/1) ratio, the EDTA-2Na modified Fe-Co/Al 2 O 3 catalyst exhibited high conversion of CO 2 (32.8 %) and excellent selectivity toward high value-added chemicals. The selectivity of by-product CO was only 8.1 %; and C 2 -C 4 = (32.5 %) and C 5 -C 11 (46.3 %) accounted for ∼79 % selectivity among the hydrocarbons generated.
研究领域:
催化化学
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环境科学
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材料科学
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Energy Storage
·
2026
·Vol. 8
·期 4
·e70395
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IF 4
Chenzhen Liu,Qiaoyu Fan,Yu Sun,Chaocheng Zhang,Hongzhi Yan,Xinjian Liu,Zhonghao Rao
In calcium cycle (CaO/CaCO 3 )-driven thermochemical energy storage systems, the thermal storage capacity of calcium-based materials decreases significantly during cycling, which is mainly attributed to high-temperature sintering and pore structure degradation. To address the aforementioned issues, this study synthesized acetic acid-modified Al 2 O 3 /MgO synergistically stabilized calcium-based thermal storage materials (Ca/Mg/Al molar ratios = 100:8:8, 100:8:10, 100:8:12, 100:8:14) via a wet blending method and investigated the effects of Al 2 O 3 /MgO doping ratios on the thermal storage performance. Results demonstrated that the optimal molar ratio of Ca:Mg:Al = 100:8:12 (labeled Ca 100 -Mg 8 -Al 12 ) exhibits a 90.81% improvement in cyclic stability of thermal storage compared to the unmodified Ca 100 sample. Microstructural characterization revealed that the calcium-based synthetic material possessed abundant micropores, smaller particle sizes, and a more uniform particle size distribution. The calcium-based synthetic material holds significant potential for broad applications in thermochemical energy storage systems.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2012
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IF 2.947
Fang Hao,Jun Zhong,Ping-Le Liu,Kui-Yi You,He-An Luo
The amorphous SiO 2 –Al 2 O 3 supported Co 3 O 4 catalysts were prepared by impregnation method and characterized by SEM, BET, XRD, XPS, NH 3 -TPD and FT-IR. The influences of the preparation conditions including the loading content of cobalt and the calcination temperature were studied in detail. The results show that the supported Co 3 O 4 /SiO 2 –Al 2 O 3 catalysts possess both Lewis and Brønsted acid sites and the amount of the Brønsted acid sites increases with the increment of the loading content of cobalt. The 20% Co 3 O 4 /SiO 2 –Al 2 O 3 catalyst calcinated at 500 °C shows relative larger surface area and pore diameter, smallest and uniform particle size, well dispersed of Co 3 O 4 . And it has the largest amount of Brønsted acid sites because it occupies the highest content of cobalt and Co 2+ . The relationship between the catalytic performances and the characterization results suggests that the Brønsted acid sites are the selective sites for the cyclohexane nitrosation to ɛ-caprolactam. The 20% Co 3 O 4 /SiO 2 –Al 2 O 3 calcinated at 500 °C gives the best result of conversion of 11.2% and ɛ-caprolactam selectivity of 83.3%, which is the best result since one step synthesis of ɛ-caprolactam from cyclohexane nitrosation was developed.
研究领域:
催化化学
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材料化学
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化学工程
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ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 5
·1901486
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IF 3.217
Xiangyan Feng,Yuanyuan Lv,Lan Zhang,Jianjun Ding,Jun Sun,Xiaoxiao Li,Lin Chen,Kang Zheng,Xian Zhang,Xingyou Tian
With the rapid development of microelectronic information technology, high-power electronic devices require high heat dissipation. Herein, the preparation of low-temperature cofired ceramic (LTCC) applications with excellent thermal conductivity and dielectric properties is focused. B 2 O 3 –Bi 2 O 3 –SiO 2 –ZnO (BBSZ) glass/Al 2 O 3 /BN green sheets are prepared by tape casting and sintered at 850 °C. The crystal phase composition, microstructure, thermal conductivity, thermal expansion coefficient, and dielectric properties of LTCC are investigated. It is shown that nanoscale rod crystals ZnAl 2 O 4 and Bi are formed in the composite. The generated nanoscale rod crystals build a 3D heat conduction channel in the composite. The thermal conductivity of the sintered sheet with 20 wt% BN is 5.165 W m −1 K −1 . The sintered sheet containing 20 wt% BN has a low coefficient of thermal expansion (2.92 ppm °C −1 ) matched well with silicon and excellent dielectric properties ( ε r = 3.9672, tan δ = 1.49 × 10 −3 ) at 20 GHz. This material has great potential applications in electronic devices.
研究领域:
材料科学
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电子材料
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陶瓷
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微电子
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热管理
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Journal of the Taiwan Institute of Chemical Engineers
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2026
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IF 6.9
Abrar Hussain,Ndumiso Vukile Mdlovu,Kuen-Song Lin,Chi-Jung Chang,Amin Hussain
Background The conversion of CO 2 into value-added fuels and chemicals remains one of the major challenges in catalysis and sustainable energy research. Developing efficient catalysts for CO₂ hydrogenation to methanol and dimethyl ether (DME) is essential for reducing greenhouse gas emissions and promoting carbon recycling. Methods In this work, a Zr-modified CuO–ZnO–Al₂O₃ (CZZA) catalyst was synthesized via a co-precipitation method for CO 2 hydrogenation. The catalyst systems “CZZA/HZSM-5-L” and “CZZA/com-HZSM-5” represent Zr-modified CZZA physically integrated with loofah-templated and commercial HZSM-5 (Si/Al = 25), respectively. A bio-HZSM-5 catalyst was also prepared using loofah sponge and rice husks as dual biotemplates to promote methanol dehydration into DME. The novelty lies in (i) the dual-biomass templating strategy (silica-rich rice husk vs. low-silica loofah) to achieve macro– meso –micro hierarchies while retaining MFI crystallinity, and (ii) Zr-promotion of the Cu–ZnO–Al₂O₃ matrix to enhance Cu⁺/Cu²⁺ and Cu–Zn interfacial sites, enabling efficient one-pass CO₂ → MeOH → DME conversion at 280 °C and 30 bar. Significant findings Zr incorporation significantly improved the structural and electronic properties of the CZZA catalyst, leading to enhanced surface area, active site dispersion, and CuO–ZnO interfacial synergy. Among all tested catalysts, the CZZA/HZSM-5-L bifunctional catalyst achieved the highest DME yield (13.2 %), DME selectivity (58.6 %), and CO₂ conversion (22.5 %) at 280 °C and 30 bar. An economic evaluation of 5- and 10-ton-per-day (TPD) DME production using refinery waste CO₂ showed payback periods of 2.98 and 2.44 years, respectively. Sensitivity analysis (±20 % variation in H 2 and DME prices) confirmed the payback remained below 4 years, demonstrating the technical and economic viability of the developed Power-to-DME process.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 3
·1256-1267
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IF 3.925
Lei Yin,Hui Yang Li,Tingting Ge,Yuchao Li,Cuncun Zuo,Ming Wang,GuangJun Cui,Haofei Huang,Lin Guo
A series of acid–base-loaded γ-Al2O3 catalysts was applied as the catalysts for the isomerization of 3/4-methyl-tetrahydro phthalic anhydride. With a basic metal (K or Na) as the basic source and phosphorus (P) as the acid source, γ-Al2O3 was modified by equal volume immersion. NH3/CO2-TPD, XRD, TEM/EDS, BET, and TGA were used to analyze the catalysts, and 15%-K/Al2O3 and 10%-P/Al2O3 were determined as the most appropriate catalysts. The isomers were qualitatively and quantitatively analyzed using nuclear magnetic resonance (1H-NMR) and infrared spectroscopy (IR), and the reaction mechanism for the isomer formation was proposed. With 3-MTHPA as the substrate, the acid/base reaction temperature was 165/150 °C, the reaction time was 3 h and the amount of the catalyst added was 3%. A new type of continuous isomeric fixed-bed reactor was designed. The stability of the catalyst was tested, and the activity loss was 4.6–6.6% after 10 hours of operation.
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APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Jing Li,Tongtong Xia,Jiacheng Xu,Chunle Zhang,Li Xu,Zuliang Wu,Shuiliang Yao
CeO 2 /γ-Al 2 O 3 catalysts with distinct crystallite sizes were synthesized by changing the precursors of ceria. CeO 2 /γ-Al 2 O 3 prepared by cerium nitrate (CN) had smaller crystalline size than samples prepared by cerium chloride or cerium acetate. They were evaluated in the plasma catalytic oxidation reaction of n -undecane (C11), which is one of the representative long-chain alkane volatile organic compounds (VOCs). CeO 2 (CN)/γ-Al 2 O 3 displayed a higher C11 conversion of 100 % with 72 % of CO 2 selectivity under ambient conditions with an energy density of 205 J/L, while samples with larger crystalline sizes showed lower activities. X-ray photoelectron spectroscopy analysis confirmed that more concentration of adsorbed oxygen species and higher ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) existed on the surface of CeO 2 /γ-Al 2 O 3 samples with smaller crystalline size. Chemisorption experiments further verified that surface oxygen vacancies resulted in the different catalytic activities. In situ diffuse reflectance infrared Fourier transform spectroscopy analyses showed that the oxidation capability of intermediates by-products enhanced with the decrease of crystalline size. Results revealed that the crystallite size of CeO 2 had a significant effect on the redox properties. This research provides an insight into the regulation of oxygen vacancy in transition metal oxides to facilitate the plasma catalytic performance of alkane VOCs under mild reaction conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Pan Li,Xinbao Li,Ye Yuan,Yang Wang,Pengfei Shen,Xinbo Zhu,Yingying Zhu
Steam reforming of bio-oil for hydrogen production is a promising green technology. Acetic acid was used as the bio-oil model compound. Experimental and density functional theory calculations were carried out to study the performance of Co/Al 2 O 3 catalysts doped with boron (B) with a 1 wt.%–5 wt.% content. Catalyst characterization by BET, XRD , XPS , NH 3 -TPD, H 2 -TPR, TEM, and TG-DTG was performed. We found that the catalyst performance improved significantly by B doping. Under the reaction conditions of T = 500 °C, steam-to-carbon ratio (S/C) = 5, and liquid hourly space velocity (LHSV) = 4.3 h −1 , the catalyst with a B doping ratio of 1 wt.% had the highest hydrogen yield of 85% and a maximum acetic acid conversion rate of 95%. The corresponding hydrogen productivity was 0.8 mmol/min. The stability of this catalyst exceeded 29 h. Density functional theory calculations showed that the interactions between the reaction intermediates and the surface were strengthened with B addition.
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JOURNAL OF THE ENERGY INSTITUTE
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2022
·
IF 6.47
Pijun Gong,Feng He,Junlin Xie,Haitao Wu
Zn species that exist in the flue gas are dangerous toxicants for SCR catalysts, which will seriously damage its catalytic activity and service life. Hence, the multi-layered nanosheets γ-Al 2 O 3 with (110) facets were introduced into the CeTiOx catalyst to improve the Zn-poisoning resistance performance. Benefiting from the structural and compositional merits, as well as the superior reducibility, abundant acid sites, and chemisorbed oxygen, the 3%Zn–Ce 0.3 -Al 0.4 -Ti catalyst with multi-layered nanosheets structure exhibits excellent NH 3 -SCR activity, over 90% NO conversion between 240 °C and 340 °C. In addition, in situ DRIFTS results suggest the SCR reaction mainly follows L-H and E-R mechanisms on 3%-Ce 0.3 -Al 0.4 -Ti samples, result from the multi-layered nanosheets γ-Al 2 O structure improves the BET specific surface area and Ce 3+ , promotes the adsorption/activation of more NH 3 and NOx species. More interestingly, compared with CeO 2 and TiO 2 the Zn species prefer to absorbed on nanosheets γ-Al 2 O 3 with (110) facets, so it can effectively protect CeO 2 from poisoning as a sacrificial agent .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Pengxin Zeng,Chuanwen Zhao,Xinmei Wang,Xinzheng Wei,Jian Sun,Ruiling Wang,Yafei Guo
The desirable CO 2 adsorption capacity and mechanical property are both important for the large-scale industrial applications of K 2 CO 3 -based CO 2 adsorbents. In this work, graphite-casted, Al 2 O 3 -supported, K 2 CO 3 -based pellets were prepared for CO 2 adsorption. The prepared K 2 CO 3 -based pellets containing 30 wt% of K 2 CO 3 calcinated at 900 °C exhibit CO 2 adsorption capacity of 1.4 mmol/g, which is over 2.5 times that of the pellets calcinated at 300 °C. It is mainly attributed to the residual graphite coating on the surface of the K 2 CO 3 -based pellets calcinated at 300 °C, which inhibits the diffusion of H 2 O due to the hydrophobicity of graphite and further causes the poor carbonation performance. Moreover, the addition of 40 wt% of microcrystalline cellulose can further enhance the adsorption capacity of the graphite-casted K 2 CO 3 -based pellets to ∼1.95 mmol/g due to the improved pore structure. However, excessive addition of microcrystalline cellulose (50–60 wt%) will lead to poor CO 2 adsorption performance (1.07–1.16 mmol/g) because of the active sites within the pellets being covered by molten K 2 CO 3 . Additionally, the structurally improved K 2 CO 3 -based pellets also exhibit desirable mechanical property with a compression strength of 69.45 MPa. Comprehensively considering the simple and easily scaled-up preparation route of graphite-casting method, the structurally improved, graphite-casted, Al 2 O 3 -supported, K 2 CO 3 -based pellets possess potential practical application prospect.
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