FUEL
·
2022
·
IF 8.035
Qiangqiang Xue,Huilin Yi,Zhengwen Li,Zhao Jiang,Meng Chen,Yujun Wang,Binhang Yan,Guangsheng Luo
Surface modification of 600-µm-sized monodisperse gamma-alumina microspheres into magnesium–aluminum spinel, and co-impregnation-based loading of Rh–Ni (0.46 wt% Rh, 9.03 wt% Ni) were performed to synthesize catalysts for diesel-steam-reforming to hydrogen. The intimate interactions between Rh and Ni, the formation of the Rh–Ni alloy, and the Rh-doping-induced decrease in the particle size of Ni were determined. The DFT calculations results revealed that Rh-doped Ni(1 1 1) established remarkably weak bonds with oxygen-containing intermediates, and the reaction barrier of the rate-limiting step (CH 2 * + O* → CH 2 O*) on Rh–Ni(1 1 1) (0.76 eV) was lower than those of Ni(1 1 1) (1.14 eV) and Rh(1 1 1) (1.56 eV). The bimetallic catalyst shows the enhanced activity and resistance of sintering and carbon deposition compared with those of Ni-based (9.33 wt% Ni) and Rh-based (0.47 wt% Rh) catalysts. The catalytic performance of Rh–Ni-based catalyst was superior to that of physically mixed Ni-based and Rh-based catalysts at similar active metal loadings, which further confirmed the synergistic effect of Rh–Ni.
研究领域:
催化化学
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能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Yuejiao Jiao,Song Han,Weidong Zhang,Min Guo,Fangqin Cheng,Mei Zhang
In this study, adsorbents were self-assembled using CuO-loaded hollow microspheres. Adsorption tests for H 2 S in biogas were performed at room temperature under dry atmosphere. The specific surface area of the adsorbent is 270 m 2 /g, with an adsorption capacity as high as 51.87 mg H 2 S/g, attributed to the well-developed adsorbent pore volume of 0.932 cm 3 /g, wherein mesopores and macropores accounted for 99.14%. In addition, nano-CuO, with a particle size of 5.34 nm, is evenly dispersed on the whiskers of the hollow spheres. These factors provide a good environment for H 2 S adsorption from biogas. The regeneration rate of the adsorbent after the third and fifth regenerations was approximately 80% and 60%, respectively, suitable for the removal of H 2 S from biogas at room temperature under dry atmosphere.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2021
·
IF 3.067
Huilin Yi,Shuliang Lu,Jiajia Wu,Yujun Wang,Guangsheng Luo
In this paper, we present a parallelized microfluidic device with improved ladder–tree distributors for the scaled-up production of monodisperse microspheres. Owing to the improved distribution form comprising a ladder distributor in the center and tree distributors around the circumference, the uniformity of the generated droplets for our device was improved by 32.9% and 86.1% compared to those achieved in devices with conventional tree and ladder distributors, respectively, in the final production stage with 32 droplet generators, indicating the potential of our device for further scale-up while maintaining the monodispersity of the generated droplets. The effect of the 2D scale-up of our device was investigated by varying the continuous-phase flow rate and viscosity. Using our device, γ-Al 2 O 3 microspheres with a diameter of 598.1 μm and a CV of 2.58%, as catalyst support for microreactors, were continuously synthesized at high production rate. The nickel-based catalyst prepared from γ-Al 2 O 3 microspheres with large specific surface area and pore volume had an average NiO size of 14 nm, which was 60.9% of that supported on industrial support. The CO methanation conversion of the Ni@Al 2 O 3 microspheres was 1.7 times larger than Ni@Al 2 O 3 industrial support at 140 °C.
研究领域:
化学工程
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材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Zhichao Yang,Weiquan Cai,Jinpeng Zhou,Qing Xia,Tielin Wang
A fast, large-scale, and stable preparation method was successfully developed to obtain η-Al2O3 microspheres with particle sizes of 3–10 μm from cheap and widely sourced NaAlO2 solution using N,N-dimethylformamide (DMF) as a morphological modifier and a precipitant simultaneously at room temperature. The yield of alumina increases from 33.3 to 77.3% by increasing the dose of DMF from 100 to 400 mL. The utilization efficiency of DMF significantly increased by adding fresh NaAlO2 into the reused filtrate after separating the bayerite precipitate (precursor of η-Al2O3). Importantly, the η-Al2O3 microspheres obtained from the filtrate-reuse experiments show the stable phase structures, morphologies, and pore structure properties. Furthermore, the typical η-Al2O3 microspheres supported Pd catalyst presents a higher catalytic activity of 10.6 g/L for the hydrogenation of anthraquinone than that of the commercial γ-Al2O3-supported Pd catalyst (8.5 g/L), suggesting that the as-prepared η-Al2O3 microspheres have good application prospects for catalytic hydrogenation and related fields.
研究领域:
材料科学
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催化
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
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IF 3.5
Huanxu Teng,Meihua Zhu,Yixuan Shao,Siqi Shao,Qingsheng Wu,Ziming Li,Xiangshu Chen,Hidetoshi Kita
Supported TS-1 zeolites were successfully synthesized on α-Al 2 O 3 microsphere by secondary hydrothermal synthesis, which were placed in the fixed-bed reactor and catalyzed the oxidation of isopropanol(IPA) with hydrogen peroxide. Effects of synthesis parameters on the morphology and catalytic activity of the supported TS-1 zeolites were systematically studied in this work. Size of α-Al 2 O 3 microsphere, and crystallization temperature could determine the coverage, titanium coordination, and titanium content of the supported TS-1 zeolites. When the crystallization temperature and H 2 O/SiO 2 molar ratio of the initial synthesis solution were 150 °C and 120, the titanium-rich and anatase-free supported TS-1 zeolites were prepared on the ca. 1 mm α-Al 2 O 3 microsphere support. The supported TS-1 zeolites showed an excellent catalytic performance and stability for isopropanol oxidation, the isopropanol conversion and acetone selectivity reached 100 % within 2 h. Kinetic studies showed that the reaction conformed to the Langmuir-Hinshelwood mechanism and that the apparent activation energy was only 4.57 kJ/mol.
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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多相催化
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环境化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 39
·18450-18460
·
IF 3.3
Yao Shen,Fang Lin,Kang Wang,Xitao Wang
CaO-doped γ-Al2O3 beads were prepared by an alginate assisted sol–gel method, followed by grafting with alkyl groups and impregnation of NbCl5 to construct multi-functionalized γ-Al2O3 beads for efficient catalytic conversion of glucose to 5-hydroxymethylfurfural (5-HMF). Doping with CaO improved the binding capacity of the catalyst with glucose and increased the Lewis acid amount. However, a high CaO content would cover the Lewis acid sites of γ-Al2O3, resulting in a lower isomeric conversion of glucose to fructose. When the C8–Ca(10%)–γ-Al2O3 catalyst was loaded with Nb2O5, intermediate fructose was consumed rapidly resulting in complete conversion of glucose, which indicated that conversion of glucose to 5-HMF involved the isomeric conversion of glucose to fructose followed by dehydration of fructose to 5-HMF. This was necessary to balance hydrophilic isomerization reactions with restraining the rehydration of 5-HMF by hydrophobic modification. This is similar to the reaction in which a medium with a certain amount of water was beneficial for glucose isomerization. Under the synergistic effect of Lewis acid provided by γ-Al2O3 and Brønsted acid offered by Nb2O5, C8–Ca(10%)–γ-Al2O3–Nb(3%), a glucose conversation rate of 100% and the highest yield of 5-HMF (68.4%) were achieved in the reaction medium with a dimethylsulfoxide/H2O (V/V) ratio of 4 : 1, a catalyst amount of 33 mg, a reaction temperature of 140 °C and a reaction time of 4 h.
研究领域:
化学工程
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催化
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材料科学
✓ 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）