CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Wei Chen,Huawu Xu,Xiaoling Ma,Lin Qi,Zhiming Zhou
Selective hydrogenation of phenylacetylene is the most effective way to remove a small amount of phenylacetylene from styrene, but it is still a challenge to develop catalysts with high activity and selectivity. Herein, a series of non-precious bimetallic Ni 3 M/SiO 2 (M = Zn, Sn, Cd, Fe, Co, Cu, or Mo) and trimetallic Ni 3 Cu–Sn/SiO 2 catalysts were prepared and applied to selective hydrogenation of phenylacetylene. A trade-off between activity and selectivity was observed on Ni 3 M/SiO 2 , where Ni 3 Cu/SiO 2 showed the best hydrogenation activity because of the hydrogen spillover effect of the Ni–Cu alloy, while Ni 3 Sn/SiO 2 exhibited the highest selectivity to styrene due to the active-site isolation effect of the Ni–Sn alloy. Impressively, trimetallic Ni 3 Cu–Sn/SiO 2 offered superior catalytic performance (94 % styrene selectivity at >99 % phenylacetylene conversion) as compared to bimetallic catalysts, owing to the synergistic effect among Ni, Cu, and Sn. In the case of Cu and Sn co-doping, the hydrogen spillover on the Ni–Cu alloy was deeply suppressed by Sn, which enabled an effective modification of the geometric and electronic structures of Ni to favor styrene desorption. The hydrogenation activity of Ni 3 CuSn 0.3 /SiO 2 can be readily enhanced by increasing the metal loading and further improved by elevating the reaction temperature and pressure, but meanwhile the high selectivity is little affected. This work demonstrates a multi-metal synergistic strategy to break the activity–selectivity trade-off of Ni-based bimetallic catalysts in the selective hydrogenation of alkynes.
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高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Liang Hong,Fu Gaosheng,Liu Jinrui,Tang Yueting,Wang Yujue,Chen Shan,Zhang Yanjie,Zhang Chen
Recent developments in 3D printing technology have been applied in the field of tissue engineering to fabricate customized bone repair scaffolds. β-tricalcium phosphate (β-TCP) is a bioceramic material with excellent potential as a scaffold foundation. Doping metallic ions with β-TCP will significantly enhance the mechanical property and bone regeneration performance compared with pure β-TCP specimens. In this study, we proposed a protocol for the fabrication of a Sn-doped β-TCP (Sn@TCP) scaffold using 3D printing technology, and the effect of Sn-doping on the physicochemical properties of the material and its in vitro bioactivity were investigated. Polyethylene glycol and polyvinyl alcohol were used as binder to construct Sn@TCP scaffolds which have good biocompability and can break down into H2O and CO2 after scaffolds sintering. The appearance of the scaffold constructed by 3D printing technology closely matched the computer design. The incorporation of Sn into β-TCP improved the compressive strength of the scaffold. Moreover, the Sn@TCP scaffold retained the inherently good biocompatibility of β-TCP and exhibited better osteoinduction capability than pure β-TCP scaffolds. Notably, the osteoinduction ability of Sn@TCP scaffolds were dependent on the Sn content. In conclusion, the 3D printing of Sn@TCP scaffolds with enhanced mechanical properties and osteoblast-inducing activity show great promise as scaffold materials in bone tissue engineering applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tingwei Zhang,Haiying Wei,Yongcan Jin,Huining Xiao
5-Hydroxymethylfurfural (HMF) is a vital platform molecule for the synthesis of a wide variety of lignocellulosic-based biochemicals and biofuels. However, it is hard to prepare HMF from glucose, and a good match between the acid properties of the catalyst and the reaction requirements is necessary. Herein, sn-doped dendritic mesoporous silica nanoparticles (sn-xDMS) were synthesized through a simple in-situ co-assembly method. The uniform incorporation of Sn species onto the silica matrix created effective Lewis acid sites for the isomerization of glucose to fructose. Moreover, appropriately increasing the Sn loading amount was conducive to increasing the densities of Lewis acid sites. In the monophasic DMSO medium, the combination of sn-20DMS and HCl could selectively catalyze the tandem reactions of the isomerization of glucose to fructose intermediate and the dehydration of fructose to HMF. Besides, acceptable HMF yields were also achieved when sn-20DMS was used together with diluted H 2 SO 4 , sulfonated polymer, or sulfonated activated carbon. Due to the lack of suitable Brønsted acid sites, the catalytic performance of sole sn-20DMS was much inferior to those of Brønsted acid catalyst-sn-20DMS combinations. Therefore, the sulfonated sn-20DMS (sn-20DMS-SO 3 H) with enhanced Brønsted acidity was successfully prepared. sn-20DMS-SO 3 H exhibited much higher catalytic selectivity toward HMF than sn-20DMS. More importantly, the catalyst reuse experiment confirmed the good recyclability of sn-20DMS-SO 3 H.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200188
·
IF 9.14
Chengjin Li,Xiaoxia Zhou,Qingming Zhang,Yi Xue,Zhaoyu Kuang,Han Zhao,Chung-Yuan Mou,Hangrong Chen
Graphical CO 2 to formic acid : A novel kind of Sn/TiO 2 /Si photocathode is developed for CO 2 reduction reaction (CO 2 RR), which shows excellent selectivity to HCOOH under applied potential. The improved light performance and heterojunction composite structure, together with the modulated electronic configuration, co-contribute to the high CO 2 RR performance. Using renewable energy to convert CO 2 into liquid products, as a sustainable way to produce fuels and chemicals, has attracted intense attention. Herein, a novel heterostructured photocathode composed of Si wafer, TiO 2 layer, and Sn metal particles has been successfully fabricated by combining of a facile hydrothermal and electrodeposition method. The obtained Sn/TiO 2 /Si photocathode shows enhanced light absorption performance by the surface plasmon resonance effect of Sn metal. Especially, the Sn/TiO 2 /Si photocathode together with rich oxygen vacancy defects jointly promote photoelectrochemical CO 2 reduction, harvesting a high faradaic efficiency of HCOOH and a desirable average current density (−4.72 mA cm −2 ) at −1.0 V vs. reversible hydrogen electrode. Significantly, the photocathode Sn/TiO 2 /Si also shows good stability due to the design of protecting layer TiO 2 . This study provides a facile strategy of constructing an efficient photocathode to improve the light absorption performance and the electron transfer efficiency, exhibiting great potential in the CO 2 reduction.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Sachin Mane,Yu-Xia Li,Xiao-Qin Liu,Lin-Bing Sun
The use of porous carbons for selective CO2 separation attracts increasing attention. Owing to low thermostability of porous polymers, low yield is the major concern of porous carbons. To obtain porous carbons with high yield, the development of thermostable porous polymers is highly expected. Herein, high yielded (70% for 700 °C and 64% for 800 °C) Sn-doped porous carbons (SnPCs) have been constructed through KOH-assisted carbonization of Sn-containing polymer. Notably, SnPC-700 (218.5 mg·g–1) demonstrates higher CO2 adsorption capacity than the reference sample prepared without KOH, SnPC-700r (188.3 mg·g–1), indicating the importance of KOH-assisted activation. Carbonization temperature has an effect on the adsorption capacity of resultant materials, and high carbonization temperature leads to better adsorption capacity on CO2. SnPC-800 is able to capture 242.8 mg·g–1 of CO2, which is better than some benchmarks including BILP-7 (193.0 mg·g–1), PAF-1–450 (196.4 mg·g–1), and FCTF-1 (205.5 mg·g–1). More importantly, SnPC-800 demonstrates good selectivity of CO2 over CH4 (31.1). Thus, high yield and good performance upon CO2 adsorption capacity and selectivity over CH4 make SnPCs attractive candidates for the removal of CO2 from natural gas.
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高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 2
·248-256
·
IF 3.382
Xiuxia Wang,Chengyan Liu,Junliang Chen,Lei Miao,Shaohai Wu,Xiaoyang Wang,Zhengchuan Xie,Wenjing Xu,Qiufeng Chen
Recently, Ag8SnSe6-based materials, belonging to the family of argyrodite compounds, have been considered as promising thermoelectric candidates due to their intrinsically ultralow lattice thermal conductivity. However, their thermoelectric properties have been rarely investigated because of the intrinsic low carrier concentration. In this work, polycrystalline Ag8SnSe6 bulk materials were successfully synthesized by a bottom-up method by using hydrothermally synthesized Ag8SnSe6 nanocrystals as the precursors. The carrier concentration and mobility of Ag8SnSe6 are successfully enhanced by introducing additional Sn, which should manipulate the self-defects and improve the crystallinity. Thanks to the synergistic optimization of crystal and composition engineering, a maximum ZT value of about 1.22 is achieved for Ag8Sn1.005Se6 at 715 K, which is about 11% higher than that of the pristine sample, and the average ZT is also improved from about 0.65 to about 0.87. This study indicates that crystal engineering and composition engineering play an important role in the thermoelectric properties of Ag8SnSe6 and may provide guidance to improve the thermoelectric performance of other argyrodite compounds.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Abdul Basit,Junyou Yang,Qinghui Jiang,Zhiwei Zhou,Jiwu Xin,Xin Li,Sihui Li
Here, the intellectual challenges for thermoelectric materials revolves around the strategy of point defect engineering to regulate the electrical and thermal transport nature of Mn 1.06- x Sn x Te ( x = 0, 0.03, 0.035, 0.04, 0.045) materials. The power factor increases with substitution of Sn into the lattice of Mn 1.06 Te leading to enhance the carrier concentrations due to reduction of the band gap. Meanwhile, the thermal conductivity has also been remarkably reduced due to diverse phonon scattering and mass fluctuation by Sn substitution. As a result, a maximum ZT ∼0.93 for Mn 1.06- x Sn x Te ( x = 0.04) sample has been achieved at 873 K, which increases by 56% in comparison with the un-doped sample.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bin Zhu,Youbing Li,Liyuan Huai,Junfeng Cui,Guoxin Chen,Qing Huang,Jian Zhang,Chunlin Chen
MAX phases have attracted considerable interest due to their structural diversities and potential applications. More than 150 MAX phases have been synthesized, especially expanding the range of A-site atoms from traditional main group elements to subgroup elements with outer layer d electronic structure. However, the functional applications for MAX phases remain somewhat limited. The A-site elements in MAX phases can amplify their inherent properties, transforming primary structural materials into multifunctional materials. As highly catalytic elements, introducing cobalt into the A-site of MAX phases can reveal surprising catalytic activities. Hence, the MAX phase with single-atom-thick cobalt layers was synthesized via an A-site alloying strategy in this work. The obtained V 2 (Sn 2/3 Co 1/3 )C MAX phase demonstrates efficient electrocatalysis in 5-hydroxymethylfurfural (HMF) oxidation reaction along with hydrogen evolution reaction (HER). In-situ electrochemical studies discover that HMF can prevent the self-reconstruction of MAX phase and oxygen evolution reaction (OER). The overall reaction reaches 94.4% yield to 2,5-furandicarboxylic acid (FDCA) at 1.60 V. Density functional theory calculations suggest that the Co-Sn bimetallic synergy in the A-site promotes the reaction. This groundbreaking investigation into using MAX phases for biomass upgrading highlights their potential in green chemistry and beyond.
研究领域:
材料科学
·
催化化学
·
绿色化学
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高影响因子
FUEL
·
2022
·
IF 8.035
Shiwei Ge,Xiaoqing Liu,Jun Liu,Hao Liu,Haiyan Liu,Xiaoping Chen,Guimin Wang,Jianjun Chen,Guojie Zhang,Yongfa Zhang,Junhua Li
A series of y Cu/Ti x Sn 1-x O 2 catalysts for selective catalytic oxidation (NH 3 -SCO) were synthesized using Ti x Sn 1-x O 2 as catalyst support and CuO as active species. Compared with pure TiO 2 support, the strong metal-support interaction between Cu active species and Ti x Sn 1-x O 2 was significantly promoted by the Sn-doping, thereby improving the catalytic activity and N 2 selectivity of the catalyst, which meets the demand of diesel vehicles to completely convert NH 3 . The results of XRD and HRTEM showed that the particle size of 20 Cu/TiSnO 2 sample is much more highly dispersed. The results of NH 3 -TPD and in-situ DRIFTS indicated that the copper species in 20 Cu/Ti x Sn 1-x O 2 can provide more Lewis acid sites than 20 Cu/TiO 2 , which is conducive to the adsorption and reaction of NH 3 . Meanwhile, XPS results proved that adsorbed oxygen on the catalyst surface is the main active oxygen species. Finally, in-situ DRIFTs and kinetic measurements found that the NH 3 -SCO reaction over 20 Cu/TiSnO 2 and 20 Cu/TiO 2 follow the i-SCR and imide (–NH) mechanisms, respectively. This catalyst will provide solutions for the future design and application of ammonia slip from mobile and stationary sources.
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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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhipeng Lv,Huiping Gao,Yayong Hu,Yunpeng Fan,Gencai Pan,Huafang Zhang,Wenwu You,Zhenlong Zhang,Yanli Mao
Broadband photodetectors covering ultraviolet (UV) to near-infrared (NIR) wavelengths play an essential role in communications, imaging, and biosensing. Developing a single photodetector with a broadband optical response operating at room temperature can significantly reduce the complexity and cost of receiver systems for multispectral applications. In this work, utilizing the porous structure characteristics of Cs2AgBiBr6:Sn thin films, a self-powered detector with broad spectral response (UV–vis-NIR) was achieved by constructing an effective Cs2AgBiBr6:Sn/PDPP3T heterojunction. This photodetector possesses a broad response spectrum from 350 to 950 nm with an average detection rate exceeding 1011 Jones and maintains excellent photoelectric performance over two months. Sn2+ doping effectively reduces the bandgap of Cs2AgBiBr6, enhancing its near-infrared absorption and optimizing energy level alignment with conjugated polymer (diketopyrrolopyrrole-terthiophene, PDPP3T). More importantly, the porous structure derived from Sn doping significantly improves carrier extraction and transport under a near-infrared light response at the heterojunction interface. Utilizing its broad spectral response characteristics in the UV–vis-NIR range, a novel information transfer and encryption system employing full optical modulation has been realized within a single perovskite photodetector. This work provides a new approach to fabricating lead-free double perovskite broadband photodetectors with potential applications in photonic devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
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PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Zheng Yang Li,Li Bo Wang,Guo Cai Zhong,Sai Sai Li,Ai Guo Zhou
Titanium tin carbide (Ti2SnC) is a member a MAX phases, which are ternary carbides or nitrides with layered structure. Ti powders are normally used as Ti source to synthesize Ti2SnC. In this paper, TiH2, a relative cheaper Ti source, was used to synthesize Ti2SnC. Ti2SnC was synthesized from TiH2/Sn/TiC or TiH2/Sn/graphite powders by a tube furnace at different temperatures under Ar atmosphere. From the analysis of X-ray diffraction results, the lowest temperature to synthesize Ti2SnC was 1000 °C. Ti2SnC content increased with temperature, and high purity Ti2SnC was fabricated at 1200 °C. From scanning electron microscopy, as-synthesized Ti2SnC from TiH2/Sn/TiC was with plate-like structure. However, for Ti2SnC from graphite as carbon source, there was some stripe microstructure. Some large pores existed between the Ti2SnC particles. The existence of the pores make the mechanical properties of Ti2SnC block significantly reduced, its compressive strength was only 0.483 MPa or 0.35 MPa respectively for samples synthesized from TiC or graphite as carbon source. The low mechanical properties make the porous sample easy to be broken as powders.
研究领域:
材料科学
·
无机化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaqi He,Xinhua Li,Zhu Qian,ZuPeng Yan,Guizhen Shi,Xia Sun,Zongqing Ma
In this paper, we innovatively introduced Sn and B into the Nb-Al system at the same time and successfully prepared high-performance Nb 3 Al bulks through mechanical alloying and subsequent low-temperature sintering processes. The influence of different doping amounts of B in the Sn-B co-doping on the superconducting properties of Nb 3 Al superconductors was also investigated. It was found that Sn-B co-doping greatly improves the superconducting properties of Nb 3 Al, especially the J c properties, compared with the undoped sample. The optimal doping amount of Sn-B co-doping is finally determined to be 4 at% Sn-2.6 at% B. At this time, the superconducting transition temperature of Nb 3 Al is up to 16.2 K, and the critical current density reaches up to 1.3 × 10 5 A⋅cm −2 (4.2 K, 5 T), which is almost twice higher than that of Sn-doped Nb 3 Al, and one order of magnitude higher than that of general undoped Nb 3 Al. Combined with the phase composition analysis and microstructure observation, we find that with the co-doping of Sn and B, the grain size of Nb 3 Al is refined, and the diffusely distributed Nb 2 Al nanoparticles are introduced, which greatly enhance the magnetic flux pinning effect of Nb 3 Al. Secondly, the intergranular connectivity of Nb 3 Al is significantly improved. The Sn-B co-doped Nb 3 Al superconductors combine the advantages of Sn doping to enhance flux pinning and B doping to improve intergranular connectivity, which synergistically promotes the dramatic improvement of Nb 3 Al superconductivity Nb 3 Al.
研究领域:
材料科学
·
超导物理
·
金属间化合物
·
凝聚态物理
·
功能材料
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