JOURNAL OF THE ENERGY INSTITUTE
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2026
·
IF 6.5
Hanrui Ma,Guangzhe Zhang,Zimeng Han,Tong Hao,Yuxin Li,Kunjie Li,Ruihong Zhao,Jiangze Han,Jingsi Yang
A Ni–Ca–Al 2 O 3 composite catalysts was developed for synergistic biomass gasification tar cracking and CO 2 fixation. • The 10Ni-Ca-Al catalyst exhibited the optimal catalytic performance, achieving a 139.2% enhancement in H 2 yield. • The catalyst showed good durability, with H 2 yield retaining 81.1% after five cycles. • Mechanistic studies further confirmed the synergistic effects among NiO, CaO, and Al 2 O 3 . Biomass gasification is a promising technology for renewable hydrogen production; however, its practical application is constrained by high tar yield and insufficient hydrogen yield. In this study, Ni-Ca-Al 2 O 3 composite catalysts were prepared and applied in a two-stage fixed-bed gasification system to enhance hydrogen production from biomass gasification through the synergistic effects of tar reforming and in-situ CO 2 adsorption. The influences of catalytic temperature, catalyst dosage, and NiO loading on gas composition, tar conversion, and catalyst stability were systematically investigated. The results show that hydrogen yield gradually increased with rising catalytic temperature. Increasing the catalyst dosage further promoted CO 2 capture and tar cracking, thereby enhancing H 2 production. The incorporation of NiO significantly improved catalytic activity, which was attributed to its acceleration of tar reforming, methane steam reforming, and the water–gas shift reaction. Among the catalysts studied, 10Ni–Ca–Al exhibited the best overall performance. Under optimal conditions (600 °C, 5 g catalyst), the gasification of pear branches resulted in increases of 108.7% in H 2 concentration and 139.2% in H 2 yield compared with the blank experiment, accompanied by a substantial reduction in tar yield to 3.6 g/kg and a tar cracking ratio of 79.7%, with a CO 2 adsorption capacity reaching 170 mg/(g cat). Characterization results confirmed that CaO effectively adsorbed CO 2 to form CaCO 3 , while NiO was reduced to metallic Ni; the synergistic interaction between the two components promoted tar cracking and enhanced H 2 yield. Cyclic stability tests demonstrated that the catalyst maintained good catalytic activity after five regeneration cycles. In summary, the Ni–Ca–Al 2 O 3 catalyst, through the dual-function coupling of tar cracking and in-situ CO 2 adsorption, provides a viable strategy for efficient hydrogen production from biomass gasification.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Tianyu Zhang,Dong Han,Wenkang Yi,Zhihong Wang,Ruina Ma,An Du,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Achieved coatings exhibiting coexistence of crystalline and amorphous SiO 2 phases. • Revealed the three-dimensional distribution and phase composition of coating pores. • Elucidated the mechanism by which SiO 2 coatings influence thermal management performance. • I corr is reduced by more than two orders of magnitude compared to the matrix. This study addresses the insufficient thermal stability and corrosion resistance of 7075 aluminium alloy by employing staged voltage-boosted plasma electrolytic oxidation (PEO) technology to fabricate an ultra-thick composite coating containing amorphous/crystalline SiO 2 within an organosilicon electrolyte. The system investigated the regulation mechanisms of duty cycle on coating phase composition, microstructure, thermal control performance, and corrosion resistance. Utilising advanced characterisation techniques such as Grazing Incidence X-Ray diffraction, X-ray computed tomography, and X-ray photoelectron spectroscopy, its underlying mechanisms were elucidated. By modulating energy input, the duty cycle significantly influenced coating growth, achieving a maximum thickness of 181.76 μm-far exceeding conventional PEO coating thickness levels. XCT analysis revealed the phase distribution and pore characteristics of the coating at a 20% duty cycle. Pores with diameters between 0 and 5 μm constituted the highest proportion (approximately 68.85%), while interconnected pores exceeding 30 μm in diameter dominated the total pore volume. Optimal thermal management performance was observed at a 30% duty cycle (absorptance 0.36, emissivity 0.89), confirming a critical thickness threshold (130 μm) and the pivotal role of amorphous SiO 2 . Corrosion resistance peaked at a 10% duty cycle, with corrosion current density reduced to 2.368 × 10 −8 A·cm −2 , representing a near two-order-of-magnitude decrease compared to the substrate. Download: Download high-res image (349KB) Download: Download full-size image
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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Lin Chen,Nan Hu,Chunquan Zhao,Xiaodan Sun,Rong Han,Yanyan Lv,Zhijun Zhang
Anthocyanin (ACN) is a natural pigment with significant industrial applications. However, foam fractionation of ACN from perilla leaves extract presents theoretical challenges due to its limited surface activity and foaming capacity. This work developed a surfactant-free active Al 2 O 3 nanoparticle (ANP) as a collector and frother, which was modified with adipic acid (AA). The ANP-AA efficiently collected ACN through the electrostatic interaction, condensation reaction, and hydrogen bonding, with a Langmuir maximum capacity of 129.62 mg/g. Moreover, ANP-AA could form a stable foam layer by irreversibly adsorbing on the gas–liquid interface, reducing surface tension, and alleviating liquid drainage. Under the appropriate conditions of ANP-AA 400 mg/L and pH 5.0, we achieved a high ACN recovery of 95.68% with an enrichment ratio of 29.87 after ultrasound-assisted extraction of ACN from perilla leaves. Additionally, the recovered ACN displayed promising antioxidant properties. These findings hold significant importance in the food, colorant, and pharmaceutical industries.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Sheng-Jin He,Ling-Feng Su,Chuang-Tian Zhan,Xiu-Bin Chen,Wei-Ming Guo,Shi-Kuan Sun,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
Low-temperature joining of SiC ceramics using raw CaO-Al 2 O 3 -MgO-SiO 2 mixed powders (CAMS-P) and CaO-Al 2 O 3 -MgO-SiO 2 glass (CAMS-G) as additives for the liquid-phase sintering of SiC nanopowders (NITE phase) in combination with surface oxidation was studied. Using CAMS-P as an additive for SiC joining required 1650 °C and produced a lower shear strength of 77.2 ± 3.5 MPa, compared to untreated SiC (108.2 ± 15.8 MPa). Using CAMS-G as an additive, the compactness of SiC joints obtained at 1550 °C was higher than that of NITE joints obtained at 1650 °C with CAMS-P as an additive. Nonetheless, the low joining temperature resulted in gaps and delaminations at the interface, and the joints strength was only 48.3 ± 5.6 MPa. Incorporating CAMS-G as an additive and surface oxidation achieved reliable NITE phase joining at 1550 °C, with no observed gaps or delaminations at the interface. The resulting joints strength was as high as 100.0 ± 0.8 MPa. The joining mechanism was discussed and compared, involving microstructural analysis .
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Catalysts
·
2020
·Vol. 10
·期 9
·1068
·
IF 3.52
Jing Zhao,Xiaorui Yang,Wei Wang,Jinhua Liang,Yasin Orooji,Chaowen Dai,Xiaomin Fu,Yunsong Yang,Wenlong Xu,Jianliang Zhu
In this work, a core-shell-like sphere ruthenium catalyst, named as 5%Ru/γ-Al2O3@ASMA, has been successfully synthesized through impregnating the ruthenium nanoparticles (NPs) on the surface of the amino poly (styrene-co-maleic) polymer (ASMA) encapsulating γ-Al2O3pellet support. The interaction between the Ru cations and the electro-donating polymer shell rich in hydroxyl and amino groups through the coordination bond would guarantee that the Ru NPs can be highly dispersed and firmly embedded on the surface of the support. In addition, the solid sphere γ-Al2O3pellet could serve as the core to support the resulted catalysts applied in the flow process in a trickle bed reactor to promote the productivity. The resulted catalyst 5%Ru/γ-Al2O3@ASMA can be applied efficiently in the glucose hydrogenation and presents a steadfast sorbitol yield of almost 90% both in batch reactor and the trickle bed reactor, indicating the potential feasibility of the core-shell-like catalyst in the efficient production of sorbitol.Keywords:core-shell;organic-inorganic hybrid;ruthenium catalyst;hydrogenation;d-glucose;targeting effect
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ENERGY & FUELS
·
2019
·
IF 3.021
Butian Xia,Liyuan Cao,Kaiwei Luo,Liang Zhao,Xiaoqin Wang,Jinsen Gao,Chunming Xu
The modified CoMo/γ-Al2O3 catalysts with different Ce and/or P loading were prepared by the incipient wetness impregnation method. The catalysts were characterized using X-ray fluorescence spectroscopy, N2-adsorption–desorption, pyridine Fourier transform infrared, H2 temperature-programmed reduction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The effect of Ce and/or P on the active phase, acidic properties, and catalytic activity of the CoMo/γ-Al2O3 catalysts were investigated in detail. The results showed that the phosphorus additive can slightly increase the stacking number of MoS2 slabs by reducing the metal–support interaction. Also, the addition of a small amount of cerium (1.75 wt %) not only increased the average slab length and stacking layer number of MoS2 slabs, but also formed new Brønsted acid sites on the support, which efficiently enhance the thiophene hydrodesulfurization (HDS) and olefins isomerization activity of the catalyst. These favorable effects are more obvious in cases where cerium and phosphorus coexist. The CoMo/γ-Al2O3P(2)Ce(1.75) catalyst exhibited the highest thiophene HDS and olefin isomerization conversion values of 98.58 and 19.51%, respectively. The high isomerization activity is able to inhibit the loss of gasoline octane number. Based on the above results, it can be concluded that the synergistic effect between Ce and P can achieve deep desulfurization and minimize the loss of octane number by modulating the acidity of the support and optimizing the active phase of the sulfided catalysts.
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RSC Advances
·
2018
·Vol. 8
·期 25
·13728-13738
·
IF 2.936
Yongxian Zhou,Wei Chen,Pengfei Wang,Yimin Zhang
The low contact efficiency, large mass transfer resistance and high operational cost of traditional 13X molecular sieve particle adsorbents (MSPs) have greatly limited their application in deep purification of trace oxygenated compounds from gaseous olefins. Herein, we successfully fabricated dense and thin 13X molecular sieve membranes on a porous α-Al2O3 tube (MSCMs) by a combination of 3-aminopropyl triethoxy silane (APTES) surface modification and vacuum pre-coating sol technology for purifying the above impurities. By a solid–solution transformation process, 13X molecular sieve membranes on MSCMs that were continuous and integral without any cracks, pinholes or other defects, and mainly composed of 1–1.5 μm regular 13X crystals with a thickness of 5–6 μm have been achieved. The purification performance of the MSPs, non-APTES functionalized MSCMs (nMSCMs) and MSCMs was evaluated by dynamic adsorption of N2 or C2H4 feed flow containing dimethyl ether, methanol and propanal impurities at room temperature. The results demonstrated that both the nMSCMs and MSCMs could deeply purify the trace amounts of the three oxygenated compounds to below 1 × 10−6 (mol mol−1) from gaseous olefins at an initial concentration of 20 × 10−6 (mol mol−1), exhibiting much more excellent purification performance than that of MSPs. In particular, the breakthrough times of MSCMs for dimethyl ether, methanol and propanal were 7 h, 32 h and 51 h in a N2 system, and 12.1 h, 53 h and 90 h in a C2H4 system. The cumulative adsorption amounts of MSCMs for dimethyl ether, methanol and propanal were 12.108 mg g−1, 35.812 mg g−1 and 103.129 mg g−1 in a N2 system, and 25.88 mg g−1, 94.19 mg g−1 and 256.26 mg g−1 in a C2H4 system, respectively. The regeneration experiment also indicated that the MSCMs had a more stable structure and a longer lifetime. The excellent purification performance of MSCMs could be attributed to the continuous 13X molecular sieve layers without non-adsorption interfacial voids. Hence, the MSCMs have great potential for future industrial application of trace oxygenated compound removal from gaseous olefins.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Lingjiao Zhan,Chaozhong Wu,Fuqin Zhang,Juan Wang,Haotian Liu,Yutong Chen,Shuwei Yao,Yunzhu Ma,Wensheng Liu
The coordinated regulation for α-Al 2 O 3 and mullite structures in the alumina-mullite duplex fiber poses a challenging yet crucial task in achieving a fiber with exceptional high-temperature properties. In this study, Fe element was added into the alumina-mullite fibers in the form of iron sol and ferric nitrate solution, respectively, with the aim of obtaining a fiber consisting of fine mullite grains embedded with nano α-Al 2 O 3 grains. The results revealed that the addition of Fe element significantly enhances the crystallization process of mullite in alumina-mullite fibers. Specifically, adding iron sol resulted in the reduce of α-Al 2 O 3 formation temperature to 1300 °C, while introducing Ferric nitrate solution promoted the formation of mullite phase. Simultaneous introduction of 1.3 wt% iron sol and 1.3 wt% Ferric nitrate solution contributed to achieve alumina-mullite fiber with tensile strength of 2.06 GPa. In addition, the influence mechanism of Fe source on the phase transformation and microstructures of alumina-mullite fiber were discussed.
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Qibao Yang,Shaobai Sang,Fuyun Yang,Yawei Li,Tianbin Zhu,Heng Wang
RO-R 2 O-Al 2 O 3 -SiO 2 enamel coatings with varying Al 2 O 3 and MgO contents were prepared for the oxidation protection of 06Ni9DR alloy steels at 1100–1200 °C. The oxidation protection ratios of these coatings were investigated under different oxidation temperatures and time, and the degradation mechanism as well as the improvements in oxidation protection were explored. The results revealed that the oxidation protection ratio of traditional enamel coating with low crystalline phase content significantly decreased with oxidation test temperatures and time. The viscosity of the liquid phase in coating reduced with temperatures, facilitating oxygen diffusion. Additionally, the interaction between the coating and the oxidation products of alloy steel further reduced the liquid phase viscosity, decreasing coating thickness and shortening oxygen diffusion paths. However, the oxidation protection of coating with higher Al 2 O 3 and MgO content were enhanced. These coatings exhibited higher crystalline phases content, which effectively increased the apparent viscosity of enamel coating and prolonged oxygen diffusion paths. The thermal stability of coating with high crystalline phases content also were improved. Among these coatings, the coating with 27.47 wt% Al 2 O 3 and 9.93 wt% MgO achieved superior oxidation protection, up to 92.1 %, 76.6 %, and 73.4 % at 1100 °C, 1150 °C, and 1200 °C for 180 min, respectively.
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Catalysis Science & Technology
·
2024
·
IF 4.4
Peng Zhang,Lele Bai,Yao Wang,Zhichao Sun,Ying-Ya Liu,Anjie Wang
Catalytic transfer hydrogenation is an effective means of producing allylic alcohols from α,β-unsaturated carbonyl compounds with extremely high selectivity. A composite catalyst bearing Lewis acid and base sites was prepared from Al(NO3)3 and dopamine hydrochloride in a one-pot synthesis followed by thermal treatment in nitrogen. The resultant catalyst exhibited remarkably high performance in transfer hydrogenation of cinnamaldehyde (CAL) to selectively produce cinnamyl alcohol (COL) using isopropanol as both hydrogen donor and solvent. A CAL conversion of 99.0% with COL selectivity of 98.9% was achieved under optimal conditions. This indicates that the nitrogen functional groups on N-doped carbon (NC), particularly pyrrolic-N and graphitic-N, significantly enhanced the catalytic efficiency of Al2O3. The enhancement of pyrrolic-N and graphitic-N in the vicinity of Al2O3 might be attributed to their concerted function in helping to deprotonate isopropanol. Based on the catalyst poisoning results, a catalytic mechanism with Lewis acid–base pairs was tentatively proposed. In addition, the composite catalyst exhibited high performances in the transfer hydrogenation of other α,β-unsaturated carbonyl compounds, including furfural, benzaldehyde, cyclohexanone, and syringaldehyde, to selectively produce the corresponding allylic alcohols.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Limo He,Song Hu,Long Jiang,Syed Shatir A. Syed-Hassan,Yi Wang,Kai Xu,Sheng Su,Jun Xiang,Lingfeng Xiao,Huanying Chi,Xiaofang Chen
Ni-based catalysts are prone to be deactivated by carbon deposition . This study aims to investigate the influence mechanism of different types of carbon deposition on the activity of Ni/α-Al 2 O 3 catalyst at various steam-to-carbon (S/C) ratios during steam reforming of toluene for hydrogen production . At a low S/C ratio of 1, the catalytic activity of Ni/α-Al 2 O 3 was inhibited due to the covering and blocking of Ni active sites by the formation of amorphous carbon on the Ni surface . While at a high S/C ratio of 3, more than 80 wt% of carbon deposition was found to be self-growth carbon nanotubes (CNTs) with an average diameter of around 15 nm. The activity of Ni/α-Al 2 O 3 in steam reforming of toluene was unusually promoted, which can be attributed to the tip-growth mechanism of CNTs, whereby the Ni particles migrated to the tip or the surface of CNTs, resulting in the improved active site dispersion.
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高影响因子
TRIBOLOGY LETTERS
·
2024
·Vol. 72
·期 3
·1-13
·
IF 2.9
Xiong Sang,He Jiaqi,Wang Chenglong
N-doped graphene oxide quantum dots (NGOQDs) with MoS 2 and Al 2 O 3 nanocomposites were prepared by solvothermal method. The morphology and the composition and structure of the prepared composites were characterized by TEM, XRD, Raman, ATR-FTIR, and XPS. Tribological behavior of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanocomposites as lubricant additive in aqueous glycerol were studied. Through experiments and MD simulations, the tribochemistry-induced lubrication mechanism was disclosed. The results shows that the combination of NGOQDs and hydrated glycerol can significantly improve lubrication performance, and the addition of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanoparticles can further improve tribological properties. The formation of a tribofilm through tribochemical induced lubrication mechanism improves the wear resistance of metal surfaces. Graphical abstract
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危险品化学品经营许可证（带存储）