JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Jie Zhang,Chuang Li,Xiao Chen,Yujing Chen,Liyun Zhang,Bingsen Zhang,Changhai Liang
Developing mechanistic insights into the promotional effect of alkaline earth metal oxides in the hydrogenolysis of lignin-derived dibenzofuran (DBF) is key to rational design of high-performance catalysts for bio-oils upgrading. The promotional effect of MgO on Pt/SiO 2 catalyst for the hydrogenolysis of DBF has been investigated. Small amounts of MgO enriches the electron density of Pt surface and the Lewis acidity of support, leading to significant improvement of the reactivity with an excellent turnover frequency (TOF) of 1182 h −1 on Pt/3MgO/SiO 2 compared with 789 h −1 on Pt/SiO 2 . The high selectivity for biphenyl depends on the combination of the acid-base properties. With the same moles of alkaline earth dopants, the activity of dopants decreased in the order: Mg > Ca > Sr > Ba, resulting from the decrease in Pt dispersion, and, decreasing linearly with decreasing electronegativity. Additionally, in 240 h stability test, Pt/3MgO/SiO 2 catalyst showed considerably stable activity and selectivity.
研究领域:
催化化学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 100
·98520-98527
·
IF 3.289
Huachao Zai,Yizhou Zhao,Shanyu Chen,Rui Wang,Lei Ge,Changfeng Chen,Yujing Li
Recycling of noble-metal-based catalysts remains difficult and limits their applications towards catalysis in organic synthesis reactions with high viscosity. This work demonstrates a magnetically responsive hydrosilylation catalyst with novel core–shell nanostructure, which can be recycled from highly viscous reaction solutions. The supporting material, with core–shell structure, incorporates a Fe3O4 nanoparticle as the core coated with silica shell through reverse microemulsion approach to form SiO2/Fe3O4 nanoparticles which show superparamagnetic behavior. Ultrafine Pt NPs are facilely prepared and loaded on SiO2 shell via a simple hydrothermal protocol, forming Pt/SiO2/Fe3O4 catalyst. As-synthesized catalysts exhibit high catalytic activity towards the hydrosilylation of allyl polyether with low-hydro silicone oil. Despite the high viscosity of the reaction system, the catalyst dispersed in reaction solution shows superparamagnetic response upon the application of magnetic field and can be recycled up to 7 times without appreciable loss in the catalytic activity. This work demonstrates a highly efficient and recyclable catalyst to catalyze hydrosilylation reaction with high viscosity and proposes a new philosophy to design reusable catalyst for organic reaction.
研究领域:
催化化学
·
纳米材料
·
有机合成
·
磁性材料
·
绿色化学
✓ 已验证
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2024
·
IF 4.5
Qiuning Zhang,Lei Li,Qianqian Yang,Wei Chen,Ziyuan Wang,Mingcui Zhang
The accurate and efficient quantification of nanodrug dosage is crucial for early anticancer therapy. The enzyme-linked immunosorbent assay (ELISA) has emerged as a robust tool for detecting anticancer nanodrug dosage; however, the development of sensing elements to quantify anticancer nanodrugs still poses a challenge. To overcome this problem, we utilize polysuccinimide-loaded curcumin (CUR @PSIOAm) as a model to employ an ELISA based on peroxidase nanozyme Pt-SiO2 Janus nanoparticles (Pt-SiO2 JNPs) for the indirect quantitative analysis of intracellular anticancer nanodrug dosage. This novel approach employs an immunoassay to indirectly quantify the dosage of anticancer nanodrugs while preserving its structural integrity. The silica components of Pt-SiO2 JNPs adsorb intermediates, while the Pt NP components exhibit high catalytic activity. Pt-SiO2 JNPs are functionalized with anti-PSIOAm antibody (Pt-SiO2 JNPs-Ab) to serve as an immunosensor capable of specific recognition of CUR @PSIOAm. Additionally, we employed cytotoxicity assays and confocal imaging techniques to demonstrate the excellent biocompatibility of CUR @PSIOAm, as well as its specific uptake by cancer cells. According to the experimental results, the limit of detection (LOD) for the immunoassay of Pt-SiO2 JNPs as a marker for detecting CUR @PSIOAm is approximately 4.5-fold lower than that of horseradish peroxidase. Therefore, by optimizing the conditions, we established a direct competitive ELISA using Pt-SiO2 JNPs as colorimetric indicators for the quantitative detection of intracellular CUR @PSIOAm. The LOD for this ELISA was determined to be 0.01 ng/mL, while the loaded CUR amount calculated from the drug loading capacity was found to be 0.22 pg/mL. Furthermore, the recoveries obtained from this established ELISA ranged between 94.0 and 108%, demonstrating excellent accuracy. Consequently, the peroxidase mimic Pt-SiO2 JNPs-based ELISA exhibits significant potential for precise quantification of intracellular anticancer nanodrug dosages.
研究领域:
生物医学工程
·
肿瘤学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Hui Wang,Wei Yang,Penghui Tian,Jie Zhou,Rui Tang,Shengji Wu
Catalytic combustion has been identified as one of the most efficient and economically feasible routes for removing volatile organic compounds. In this work, supported noble-metal (Pd and Pt) catalysts for catalytic combustion of toluene were prepared by an improved incipient wetness impregnation method. Controlled amounts of oleic acid (OA) were introduced into the aqueous solution of metal salts in this new preparation method, which improved Pd and Pt dispersion remarkably on SiO 2 , as confirmed by XRD and TEM. XPS results showed that introduction of OA in the catalyst preparation resulted in increased proportion of metallic palladium. All of the activities in catalysts with OA were much higher than those of the catalysts without OA in the same catalyst system. Among the catalysts prepared, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst exhibited the best catalytic activity for toluene oxidation, and the T 98 of toluene was only 160 °C under the conditions of toluene concentration at 1000 ppm and SV at 60,000 mL/(g h). Furthermore, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst maintained high catalytic activity in the active stability test at 160 °C, and the result of TG indicated that no coke was formed on the spent catalyst.
研究领域:
环境催化
·
材料化学
·
化学工程
·
大气污染控制
·
纳米催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Yutao Chen,Jihui Xiang,Jinmin Xie,Xinyu Wang,Zeyu Jiang,Yanfei Jian,Mudi Ma,Chi He
SO 2 exhibits opposite effects on C 3 H 8 oxidation over Pd/SiO 2 and Pt/SiO 2 . • O 2 concentration regulates sulfur species evolution and SO 2 tolerance. • Sulfate species block Pd active sites and induce Pd particle sintering over Pd/SiO 2 . • Pt-O-O-S structures on Pt/SiO 2 promote C 3 H 8 adsorption and C-H cleavage. The oxygen concentration in industrial C 3 H 8 -containing exhausts fluctuates significantly (from 0.5 to 18 vol%). However, the intrinsic effect of SO 2 on catalytic C 3 H 8 oxidation under diverse oxygen conditions is greatly overlooked, leading to a discrepancy in the SO 2 tolerance of developed catalyst between laboratory and real-world emission conditions. Herein, the influences of oxygen contents on sulfur species distribution and subsequent sulfur tolerance of typical Pd/SiO 2 and Pt/SiO 2 catalysts during C 3 H 8 oxidation were systematically explored. Experimental results reveal that the oxygen concentration dramatically affects the types and contents of sulfur species over catalysts. For Pd/SiO 2 , SO 2 tends to be converted into sulfate (SO 4 2- ) species to cover the Pd 0 active sites and causes Pd particle sintering, thereby inhibiting the C 3 H 8 adsorption and oxidation. In sharp contrast, sulfite (SO 3 2- ) species form on Pt/SiO 2 , leading to a novel Pt-O-O-S active interface that enriches the adjacent Pt site with electrons, promoting C 3 H 8 adsorption and C-H cleavage and further enhancing catalytic activity. As oxygen concentration decreases, the impact of SO 2 on catalytic performance becomes more pronounced. Under the oxygen-lean conditions, Pd particles sintering caused by SO 2 is the most severe at 1 vol% O 2 , causing an 80 °C temperature increasing in 90% C 3 H 8 conversion; however, the contents of SO 3 2- species and Pt-O-O-S structures on Pt/SiO 2 are elevated, facilitating C 3 H 8 adsorption and activation. Our findings enrich the understanding of SO 2 behavior under different industrial conditions, providing a theoretical basis for the design of SO 2 -tolerant catalyst in diverse application scenarios. Download: Download high-res image (178KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 4
·258
·
IF 5.4
Liu Yeru,Zhang Mengxue,Zhou Yifan,Zhao Xiaolei,Li Xiangli,Liu Hongwei,Cai Qiyong,Liu Song
A reversed positive-signal electrochemical immunosensor was developed for ultra-sensitive tetracyclines (TC) detection, leveraging a synergistically engineered interface of conductive urchin-like Au@Pt nanoparticles (NPs) and insulating SiO 2 nanoprobes. The Au@Pt NPs provide a high-performance electroactive foundation that significantly expands the effective surface area and accelerates interfacial electron transfer kinetics. A ‘signal-on’ mechanism was innovatively constructed by utilizing the mass-transport resistance and steric hindrance of bulky, insulating SiO 2 -antibody conjugates. In the absence of TC, the anchoring of SiO 2 nanoprobes creates a dense insulating barrier that truncates electron tunneling paths. Conversely, the competitive recognition of free TC prevents probe anchoring, removing the barrier and restoring charge transfer, which results in a significantly enhanced signal. This strategy effectively transforms passive dielectric blocking into a sensitive electrochemical response, allowing effective signal amplification of subtle recognition events. Under optimized conditions, the sensor exhibited a linear differential pulse voltammetry (DPV) response from 20 fg/mL to 20 ng/mL, with detection limits of 4.55 fg/mL and 11.58 fg/mL for the glassy carbon electrode and the screen-printed electrode, respectively. The sensor demonstrated excellent specificity against structural analogs, high reproducibility, and reliable recovery in spiked milk samples. This work validates the efficacy of using cost-effective insulating nanomaterials for high-sensitivity biosensing, offering a robust tool for food safety surveillance.
Section
Graphical
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2018
·
IF 4.244
Lingxian Ye,Guangying Zhao,Wenchao Dou
A sensitive Point-of-Care Testing (POCT) with Au-Pt bimetallic nanoparticles (Au@Pt) functionalized silica nanoparticle (SiO 2 NPs) and Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 NPs) was designed for the quantitative detection of Escherichia coli O157:H7 ( E. coli O157:H7). The poly-(4-styrenesulfonic acid- co -maleic acid) (PSSMA) as a negatively charged polyelectrolyte can be easily coated on surface of the amino group modified SiO 2 NPs via electrostatic force . PSSMA is also a good stabilizer for water-soluble bimetallic nanostructures . The PSSMA is first time used as a “bridge” to connect the negative charge Au@Pt NPs to the SiO 2 NPs, forming Au@Pt/SiO 2 NPs. Antibody and invertase conjugated Au@Pt/SiO 2 NPs (denoted as Ab/invertase-Au@Pt/SiO 2 NPs) were used as signal labels. Monoclonal antibody against E. coli O157:H7 (Ab) functionalized magnetic nanoparticles (denoted as Ab-Fe 3 O 4 @SiO 2 NPs) were used to enrich and capture the E. coli O157:H7 in positive sample. The immunosensing platform also composed of a personal glucometer (PGM) using for signal readout. Based on this sandwich-type immunoassay , the invertase in the final formed sandwich immunocomplex catalyzed the hydrolysis of sucrose to produce a large amount of glucose for quantitative readout by the PGM. Under optimal conditions, a linear relationship between the glucose concentration and the logarithm of E. coli O157:H7 concentration was obtained in the concentration range from 3.5 × 10 2 to 3.5 × 10 8 CFU mL −1 with a detection limit of 1.83 × 10 2 CFU mL −1 (3σ). This method was used to detect E. coli O157:H7 in spiked milk samples, indicating its potential practical application. This protocol can be applied in various fields of study.
研究领域:
生物医学工程
·
纳米技术
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 20
·13556-13563
·
IF 3.9
Xia Xu,Mingqiang Li,Liming Yang,Bing Hu
Reasonable design of bimetallic nanomaterials with support is beneficial to improve catalytic performance. This work reports a new kind of sodium sesquicarbonate-supporting Fe2O3@Pt via etching Fe3O4@Pt@SiO2, which exhibits highly efficient and stable catalytic reduction performance towards 4-NP. Sodium sesquicarbonate-supporting Fe2O3@Pt has an interconnected one-dimensional network structure that provides sufficient channels for mass transfer. At the same time, a large amount of Fe2O3@Pt is exposed on its surface, which hinders the aggregation of pt clusters and Fe2O3 nanoparticles, and facilitates the direct contact of Fe2O3@Pt reaction sites with reactant molecules, thus improving the catalytic rate of 4-NP reduction reaction. Moreover, the introduction of non-metallic Fe can not only reduce the consumption of precious metal Pt, but also improve the catalytic efficiency due to the synergistic effect. This study opens up a new avenue to develop robust catalysts for heterogeneous catalytic reactions.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Zhuwei Yang,Xiang Gong,Linsen Li,Zhao Jiang,Riguang Zhang,Tao Fang
Liquid organic hydrogen carriers (LOHC) are considered as the promising candidates for large-scale hydrogen storage. The N -ethylcarbazole/dodecahydro- N -ethylcarbazole (NECZ/12H-NECZ) system has received increasing attention due to its excellent comprehensive properties in the hydrogen storage candidates. In this work, the Pt/SiO 2 -TiO(OH) 2 catalysts are synthesized and show good activity, selectivity and stability for 12H-NECZ dehydrogenation reaction. Among them, the 2.5 wt% Pt/SiO 2 -TiO(OH) 2 catalyst shows the best dehydrogenation performance with 5.75 wt% H 2 release amount and 98 % selectivity of NECZ. Combined with XRD, HRTEM, ATR-FTIR, XPS and EPR analysis, it is found that the oxygen vacancy concentration in Pt/SiO 2 -TiO(OH) 2 is significantly enhanced due to the formation of Si-O-Ti species compared with Pt/SiO 2 and Pt/TiO(OH) 2 , which strengthens the SMSI (strong metal-supporting interaction) effect between metal Pt and support SiO 2 -TiO(OH) 2 . The optimized d-band center of catalyst is beneficial for accelerating the sluggish kinetics of the rate-limiting step of the whole dehydrogenation reaction. Furthermore, compared with the results by replacing SiO 2 with Al 2 O 3 or CeO 2 , it is indicated that the introduction of oxides mainly plays the role of regulating the surface electronic state of TiO(OH) 2 and increasing the oxygen vacancy concentration.
研究领域:
催化化学
·
材料科学
·
氢能存储
✓ 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）