CATALYSIS LETTERS
·
2023
·
IF 2.8
Chen Yiming,Hou Zhanggui,Wang Chuan,Ma Xin,Yang Hong,Wang Wen,Zhou Ling,Zhang Yi
As well known, the industrial methanation process needs highly active and stable catalysts obtained from cheap and abundant elements. In this work, we propose a high-loaded Ni/Al 2 O 3 catalyst promoted by manganese. Among them, the 20Ni2Mn/Al 2 O 3 catalyst exhibits the best CO 2 conversion (90.5%) and excellent methanation stability at 250 °C. In addition, the roles of the Mn promoter on CO 2 conversion and selectivity were investigated in detail. The features of natural and promoted catalysts are described through XRD, XRF, BET, TEM, H 2 -TPR, CO 2 -TPD, and operando DRIFTS techniques. Based on various characterization results, the addition of Mn will greatly reduce the Ni particle size and improve the Ni dispersion on the alumina support. Furthermore, compared to the unpromoted catalyst, Mn promoted catalysts show better reducibility and have more medium basic sites. And these medium basic sites are favorable to the adsorption and activation of CO 2 . In-situ DRIFTS experiments for CO 2 methanation reveal that manganese could promote the monodentate carbonate hydrogenated to formate rapidly, which could be faster converted towards CH 4 , contributing to significantly improved activity of the Mn promoted Ni/Al 2 O 3 catalyst. Graphical Abstract
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Huihui Yan,Kun Wang,Liping Zhao,Peng Zhang,Jing Liu,Lian Gao
Flexible aluminum oxide (Al 2 O 3 ) fibers were prepared by the blow spinning method and their potential as a high-temperature catalyst support was investigated. The synthesized Al 2 O 3 fibers exhibited remarkable flexibility in both mechanical compression and recovery tests, which remained intact in a wide temperature range from −196 °C to 1200 °C. Moreover, their low thermal conductivity of 0.030 W K −1 ∙m −1 , demonstrated an outstanding thermal insulation . Subsequently, nickel nanoparticles were uniformly distributed on the surface of the Al 2 O 3 fibers as a self-supporting catalyst using a conventional impregnation method. The resulting self-supporting Ni/Al 2 O 3 catalyst demonstrated remarkable thermo-catalytic performance and re-activation capability at high temperatures for thermocatalytic reaction of dry reforming of methane (DRM). Our findings highlight the potential of pure Al 2 O 3 flexible fibers as a versatile material for various industrial applications, including high-temperature catalysis.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mao Chen,Zijie Song,Haoyuan Lei,Hailong Wang,Shaojun Zhang,Rui Zhang,Hongxia Li,Bingbing Fan,Yongqiang Chen
Customized porous Al 2 O 3 -ZrO 2 -mullite composites were designed and prepared by reaction sintering of zircon (ZrSiO 4 ) and alumina (Al 2 O 3 ) at sintering temperatures from 1400 to 1600 °C for 3 h. The mechanical properties , microstructural evolution , and reaction mechanisms of the composites were investigated. The reactions between ZrSiO 4 and Al 2 O 3 were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). The results indicate that ZrSiO 4 and Al 2 O 3 react and form ZrO 2 and mullite . Sintering temperature has an important effect on the reaction process. At 1400 °C, Al 2 O 3 reacts directly with SiO 2 of ZrSiO 4 to form mullite and ZrO 2 , which reduces the decomposition temperature of ZrSiO 4 and promotes the decomposition of ZrSiO 4 . However, at 1600 °C, ZrSiO 4 first decomposes to form SiO 2 and ZrO 2 , and then generates mullite by the diffusion of Si. The migration of Si is the key factor for the formation of mullite. The thermal shock resistance of the composites can be significantly improved by phase transformation toughening of in-situ ZrO 2 . Therefore, increasing the proportion of ZrSiO 4 can significantly improve the mechanical properties of sample. The residual ratio of the flexural strength after thermal shock exceeded 90%, when the mass ratio of ZrSiO 4 to Al 2 O 3 was 3:1. Besides, the addition of polymethyl methacrylate could improve the porosity of materials and has a direct effect on the thermal conductivity of composites.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Yuhang Yang,Chuanwen Zhao,Pengxin Zeng,Yuhao Wang,Xue Qin,Yueyue Gao,Yafei Guo,Ruilin Wang,Jian Sun
Suitable molding and granulation methods are crucial, and an outstanding sphere structure can play a better role in the future scale-up industrial application of K 2 CO 3 -based CO 2 adsorbent. Water will form a large contact angle on the surface of hydrophobic solution and become sphericity water. In this work, hydrophobic powders (polyethylene (PE), TiO 2 , and SiO 2 ) were selected in the hydrophobic interface-assisted method. The CO 2 adsorption capacity of TiO 2 pellets is 0.50 mmol/g, while that of PE pellets is 0.24 mmol/g, and finally that of SiO 2 pellets is 0.36 mmol/g. Then, experiment proved that high temperature (>500 ℃) makes the hydrophobic powders (i.e, TiO 2 and SiO 2 ) lose hydrophobicity which make water molecules diffuse faster, while PE is completely decomposed at high temperature. Compared with the pellets calcined at 300 ℃, the TiO2 pellets calcinated at 500 ℃ have an adsorption capacity of 0.70 mmol/g, which is over 1.72 times that of the original pellets, and the other two hydrophobic surfaces are also improved to some extent. Additionally, the appropriate ratio of low-temperature pore forming agent (i.e., urea) can help improve the adsorption performance, while excessive addition will lead to poor CO 2 adsorption performance. In addition, the K 2 CO 3 /Al 2 O 3 pellets also exhibited desirable mechanical properties, with an optimal compressive strength of 41 Mpa. Therefore, the loss of hydrophobicity leads to more active diffusion of water molecules, which may provide a new idea for the future development of CO 2 adsorbents and other areas.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shouzhen Li,Xiaota Cheng,Guangting Han,Yang Si,Yitao Liu,Jianyong Yu,Bin Ding
Developing ceramic nanofibrous membranes for the thermal insulation layer of firefighting protective clothing is vital. However, previous ceramic nanofibrous membranes were brittle and easy to break during service in high-temperature environments. The lack of elastic and compressible properties has limited the high-end applications of ceramic nanofibrous membranes. In this work, elastic and compressible Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes were fabricated via sol–gel electrospinning and calcination in air at different temperatures. The as-fabricated Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes can maintain excellent elasticity and compressibility in the temperature ranging from −196 to 1400 °C. Moreover, they have low thermal conductivity and high working temperatures. These favorable characteristics make the Al 2 O 3 /ZrO 2 /La 2 O 3 nanofibrous membranes a promising candidate for the thermal insulation layer of firefighting protective clothing.
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PubMed
高影响因子
FUEL
·
2019
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IF 5.128
Lina Han,Weiguo Ren,Bing Wang,Xingxing He,Lingjun Ma,Qihuang Huo,Jiancheng Wang,Weiren Bao,Liping Chang
In this work, a novel method is introduced to activate coal gangue (CG) for extraction of Si and Al species. The activation experiments were carried out using a stainless steel tube reactor (17 mL) and an autoclave reactor (1000 mL). Firstly, CG was activated by supercritical water added with alkali. It was found that the kaolinite phase of raw CG could be transformed into cancrinite, sodalite and kalsilite by using NaOH, Na 2 CO 3 and KOH as activators, respectively. Secondly, silica (SiO 2 ) and alumina (Al 2 O 3 ) were prepared by acid and alkali combination method. The extraction rates of Al 3+ and Si 4+ from the activated CG using KOH as activator were as high as 78.9% and 69.2%, respectively. The purity of SiO 2 and Al 2 O 3 products were 96.2% and 99.3%, respectively. The as-synthesized SiO 2 both from 17 mL and 1000 mL reactor exhibited very high specific surface areas of 710.0 m 2 ·g −1 and 872.8 m 2 ·g −1 , respectively. In addition, the SiO 2 after hydrophobic modification displayed excellent absorption selectivity for xylene.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8327-8332
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IF 1.354
Wang Feng,Ge Hong-Hua,Wu Kai,Sha Jun-Yi,Wang Le-Tian,Wan Chuan,Zhao Yu-Zeng,Meng Xin-Jing
The influence of Al2O3 nanoparticles on corrosion inhibition of benzotriazole (BTA) in brass/ simulated water system was studied by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). The results show that BTA has good corrosion
inhibition effect on brass. Al2O3 nanoparticles could reduce the corrosion inhibition performance of BTA. The higher the concentration of Al2O3 nanoparticles in simulated water, the lower corrosion inhibition performance of BTA. The isothermal adsorption
of BTA on brass surface in simulated water and Al2O3 nanofluids was analyzed. The results indicated that the adsorption of BTA on brass surface followed the Langmuirs’ adsorption isotherm, the adsorption Gibbs free energy ΔG was less than −40 kJ/mol,
corresponding to chemical adsorption, in both simulated water and Al2O3 nanofluids. The −ΔG value of BTA on brass surface decreased in Al2O3 nanofluids, indicating the weakening of the BTA adsorption on the brass surface. Surface
analysis of brass samples by optical microscope and X-ray diffraction confirmed the above results.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhongping Li,Zhaowen Huang,Ning Xie,Xuenong Gao,Yutang Fang,Zhengguo Zhang
Expanded graphite (EG), as a new kind of functional carbon-based material, is a vital supporting material and heat transfer enhancer for preparing highly conductive form-stable composite phase change materials (PCMs). However, the hydrophobic nature of EG makes it difficult to incorporate with inorganic PCMs. In this work, we intended to solve this drawback and a modified EG named Al 2 O 3 -coated EG which was characterized by enhanced hydrophilicity was developed via a heterogeneous nucleation technique and subsequent heat treatment. Experiments found that the Al 2 O 3 layer on the surface of EG was uniform and essentially amorphous , and was well-bonded to EG via chemical interactions between oxygen atoms from Al 2 O 3 and carbon atoms from EG. The hydrophilicity and oxidation resistance of Al 2 O 3 -coated EG could be enhanced by increasing the amount of Al 2 O 3 . Most importantly, compared with EG, the water contact angle of Al 2 O 3 -coated EG dropped from 90.7° to 33.9° when only 4.4 wt% Al 2 O 3 was used, indicating that the hydrophilicity of EG could be greatly enhanced by low cost. Moreover, molecular dynamics (MD) simulation of the hydrophilicity of EG and Al 2 O 3 -coated EG proved that the preparation of Al 2 O 3 -coated EG was an efficient and feasible method to improve the hydrophilicity of EG.
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高影响因子
Theranostics
·
2018
·
IF 8.537
Wenfei Chen,Ming Qin,Xiaoyan Chen,Qin Wang,Zhirong Zhang,Xun Sun
Photothermal therapy (PTT) can be an effective antitumor therapy, but it may not completely eliminate tumor cells, leading to the risk of recurrence or metastasis. Here we describe nanocarriers that allow combination therapy involving PTT and immunotherapy. Nanocarriers are prepared by coating Al 2 O 3 nanoparticles with non-toxic, biodegradable polydopamine, which shows high photothermal efficiency. A near-infrared laser irradiation can kill the majority of tumor tissues, resulting in the release of tumor-associated antigens. The Al 2 O 3 within the nanoparticles, together with CpG, acts as an adjuvant to trigger robust cell-mediated immune responses that can help eliminate the residual tumor cells and reduce the risk of tumor recurrence. Methods: The characteristics and photothermal performance of polydopamine-coated Al 2 O 3 nanoparticles were examined after one-step preparation. Then we studied their internalization, photothermal toxicity and immunostimulatory activity in vitro . For in vivo experiments, these nanocarriers were injected directly into B16F10 melanoma allografts in mice to ensure specific localization. After photothermal irradiation on day 0, mice were subcutaneously injected with CpG adjuvant on day 1, 3 and 5. Tumor volumes and number of living mice were recorded every two days. Moreover, various immune responses induced by our combined therapy were tested for mechanism research. Results: 50% of mice after our combined treatment successfully achieved the goal of tumor eradication, and survived for 120 days, which was the end point of the experiment. Mechanism studies demonstrated the combined therapy efficiently led to dendritic cell maturation, resulting in the secretion of antibodies and cytokines as well as the proliferation of splenocytes and lymphocytes for anti-tumor immunotherapy. Conclusion: Taken together, these results demonstrated the promise of our combined photothermal therapy and immunotherapy for tumor shrinkage, which merited further research.
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高影响因子
SOLID STATE PHENOMENA
·
2018
·
IF 0
Min Wang,Zi Yuan Wang,Ya Jie Yuan,Wei Pan
The 8 wt.% yttria-stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) are widely used to protect hot superalloy components of gas turbine and jet engine. However, Cracks and pores in the 8YSZ coating would accelerate the oxidation of the bondcoat alloy and the corrosion of 8YSZ topcoat by molten salts and finally result in permanent failure of the TBCs. Hence, in this work, a sol-gel spin-coating method was employed to prepare a dense α-Al2O3 film on the surface of air-plasma-sprayed 8YSZ coatings, in order to block the paths of cracks and pores while keeping the stress tolerance of 8YSZ coatings. The influences of the polyvinylpyrrolidone (PVP) and alumina content of the sol on the microstructure of the α-Al2O3 film were investigated. It is found that a sol with PVP addition amount of 50 mg/mL and alumina solid content of 10% let to the achievement of a compact α-Al2O3 film. The positive results in this work would inspire more efforts to prepare dense films on TBCs and therefore improve their performance under service conditions.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Yuluo Chen,Jinpeng Luo,Hang Xu,Xinran Hou,Man Gong,Changshu Yang,HuiCong Liu,Xiuqin Wei,Lang Zhou,Chuanqiang Yin,Xiaomin Li
Owing to its excellent thermal stability, polyimide (PI) is regarded as one of the most promising alternatives among separators for high-safety lithium-ion batteries (LIBs). Unfortunately, the wettability of the PI separator to electrolytes is still undesirable. The complexation–hydrolyzation method was used to develop a composite membrane with a core–shell structure that anchors γ-Al2O3 nanoparticles on PI nanofiber (PI@γ-Al2O3) as an LIB separator. The effects of surface treatment on the physicochemical and electrochemical properties of PI composite membranes are studied in detail, using the pristine PI nanofiber membrane as a reference. The results show that the PI@γ-Al2O3 nanofiber membrane exhibits better physicochemical properties and electrochemical performances. Specifically, the wettability property of the PI@γ-Al2O3 nanofiber membrane is improved with an almost zero contact angle, which significantly meets the requirements of high-performance LIBs. Furthermore, the electrochemical performance of the PI@γ-Al2O3 nanofiber membrane also shows excellent comprehensive properties with the ionic conductivity improving from 0.81 to 1.74 mS cm–1. Besides, the PI@γ-Al2O3 nanofiber membrane maintains a long charge–discharge process with a capacity retention rate of 98% at 0.5 C after 100 cycles. Consequently, the aforementioned excellent performances illustrate that core–shell PI@γ-Al2O3 nanofiber membranes have a promising future for the safety and stability of LIBs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
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IF 14.224
Xinyu Zhou,Pin Mao,Huiran Jin,Wanxia Huang,Aotian Gu,Kaiwei Chen,Shan Yun,Jing Chen,Yi Yang
Cu-based functional materials are excellent candidates for the elimination of iodine anions. However, the low utilization rate of Cu and its unsatisfactory adsorption performance limit its large-scale practical applications. This paper proposes a co-gelation method to obtain Cu/Al 2 O 3 aerogels with a high specific area (537 m 2 /g). Cu/Al 2 O 3 aerogels have a hierarchical porous structure and contain a high proportion of Cu (20.5 wt%). The high dispersibility of Cu, which is based on an in-situ gel process, provides conditions for the high-efficiency elimination of iodide anions. We conducted adsorption experiments that demonstrated that the fabricated Cu/Al 2 O 3 aerogel had an ultrahigh adsorption capacity (407.6 mg/g) and a fast adsorption equilibrium time (0.5 h) for iodide anions. Additionally, the Cu/Al 2 O 3 aerogel could selectively capture iodine anions even in the presence of high concentrations of competing ions (NO 3 - , SO 4 2- , and Cl - at 60 mmol/L). Importantly, the aerogel can operate in a wide pH range of 3–11 without causing secondary pollution. This work demonstrates that low-cost Cu/Al 2 O 3 aerogels exhibit great potential for eliminating radioactive iodine anions.
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高影响因子
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