CATALYSIS TODAY
·
2022
·
IF 6.562
Lidan Deng,Qiao Chen,Xingmao Jiang,Xiaowei Liu,Zheng Wang
Propane dehydrogenation is a promising way to produce propylene . Catalysts with high propane conversion, selectivity to propylene , and stability are vital to this technology. In this work, we determined that the catalytic performance of Pt/SBA-15 can be significantly enhanced by introducing an appropriate amount of indium . A too low ratio of In/Pt (1/8) or too high of a ratio (2/1) is detrimental to the activity of the catalyst. When the nominal ratio of Pt to In is 1/1, the initial propane conversion and selectivity towards propylene over 1Pt1In/SBA-15 are highest among all catalysts tested at 57.06 % and 99.04 %, respectively. The conversion rate decreased to 39.63 % after 28 h of reaction, but selectivity was retained at greater than 99 %. Very little coke was deposited on the used 1Pt1In/SBA-15 catalyst. With catalyst characterization, it was proposed that Pt 1 In 1 alloy nanoparticles with surface-enriched In 2 O 3 were responsible for the selective dehydrogenation of propane.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shan Wang,Zunfu Hu,Qiulian Wei,Ping Cui,Huimin Zhang,Weina Tang,Yunqiang Sun,Haiqiang Duan,Zhichao Dai,Qingyun Liu,Xiuwen Zheng
Recently, extending single-atom catalysts from mono- to binary sites has been proved to be a promising way to realize more efficient chemical catalytic processes. In this work, atomically dispersed Fe, Pt dinuclear catalysts ((Fe, Pt)SA-N-C) with an ca. 2.38 Å distance for Fe1 (Fe-N3) and Pt1 (Pt-N4) could be precisely controlled via a novel secondary-doping strategy. In response to tumor microenvironments, the Fe-N3/Pt-N4 moieties exhibited synergistic catalytic performance for tumor catalytic therapy. Due to its beneficial microstructure and abundant active sites, the Fe-N3 moiety effectively initiated the intratumoral Fenton-like reaction to release a large amount of toxic hydroxyl radicals (•OH), which further induced tumor cell apoptosis. Meanwhile, the bonded Pt-N4 moiety could also enhance the Fenton-like activity of the Fe-N3 moiety up to 128.8% by modulating the 3d electronic orbitals of isolated Fe-N3 sites. In addition, the existence of amorphous carbon revealed high photothermal conversion efficiency when exposed to an 808 nm laser, which synergistically achieved an effective oncotherapy outcome. Therefore, the as-obtained (Fe, Pt)SA-N-C-FA-PEG has promising potential in the bio-nanomedicine field for inhibiting tumor cell growth in vitro and in vivo.
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高影响因子
Small
·
2022
·Vol. 18
·期 16
·2105129
·
IF 15.153
Songlong Jiao,Mengshu Kong,Zhenpeng Hu,Shiming Zhou,Xiaoxuan Xu,Lei Liu
Single-atom catalysts (SACs) can achieve excellent catalytic efficiency at ultralow catalyst consumptions. Herein, platinum (Pt) atoms are fixed on the wall of atomic layer deposition (ALD)-made molybdenum disulfide nanotube arrays (MoS 2 -NTA) for efficient hydrogen evolution reaction (HER). More concretely, MoS 2 -NTA with different nanotube diameters and wall thicknesses are fabricated by a sacrificial strategy of anodic aluminum oxide (AAO) template via ALD; then Pt atoms are fixed on the wall of Ti 3 C 2 -supported MoS 2 -NTA as a catalytic system. The MoS 2 -NTA/Ti 3 C 2 decorated with 0.13 wt.% of Pt results in a low overpotential of 32 mV to deliver a current density of 10 mA cm –2 , which is superior to 20 wt.% commercial Pt/C (41 mV). Ordered MoS 2 -NTA instead of 2D MoS 2 prevents Pt atoms from aggregating and then exerts catalytic activities. The density functional theory calculations suggest that the Pt atoms are more likely to occupy the sites on the tubular MoS 2 than the planar MoS 2 , and the Pt atoms accumulated at the Mo site of MoS 2 -NT have a moderate Gibbs free energy (close to zero).
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jian Tian,Kok Bing Tan,Yichen Liao,Daohua Sun,Qingbiao Li
A zeolitic cage was introduced and rationally fabricated by encapsulating Pt nanoparticles (NPs) in hollow ZSM-5, a nanomaterial with a cavity and porous shell, for efficient catalytic oxidation of benzene. The structure and formation of the zeolitic cage were systematically investigated and characterized using transmission electron microscopy , nitrogen sorption investigations, X-ray photoelectron spectroscopy, nuclear magnetic resonance spectroscopy , and X-ray diffraction. The obtained hollow 0.2 Pt@ZSM-5 exhibited a comparable low-temperature catalytic activity with 0.5Pt/ZSM-5 with T 90 value of 178 °C. Various characterization techniques combined with adsorption experiments uncover the tremendous role of the zeolitic cage in the catalytic activity toward benzene oxidation. The porous shell prevented benzene dilution and the acidity originating from the hollow interior of ZSM-5 promoted the storage of benzene, thereby forming a high local concentration of benzene around Pt NPs, resulting in excellent catalytic performance. These findings provide valuable insights into the rational design of efficient catalysts for the catalytic oxidation of volatile organic compounds.
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高影响因子
Materials Today Energy
·
2021
·
IF 7.311
Xilong Wang,Yadong Li,Chen Yang,Jiajia Lu,Lijuan Cao,Han-Pu Liang
A considerable number of strategies have been investigated to construct highly-efficient and stable Pt-based electrocatalysts for promoting the oxygen reduction reaction, which plays a critical role in proton exchange membrane fuel cells and metal-air batteries. In this contribution, Pt-based intermetallic nanoparticles confined in a Co-doped zeolitic imidazolate framework-8 derived carbon matrix with cobalt nanocrystallites and Co-N x sites decoration are conceptually predicted and experimentally constructed by a novel surfactant-assisted Pt implantation and in-situ alloying strategy. Cationic surfactant cetyltrimethylammonium bromide was simultaneously used as the functional capping ligand to coordinate with [PtCl 6 ] 2- and structure-directing agent for synthesis of rod-like Co-doped zeolitic imidazolate framework-8. Systematical characterization and contrast experiments reveal that the Pt-based intermetallic compounds are mainly Pt 3 Co nanocrystalline , and cetyltrimethylammonium bromide is critically important for Pt reservation and highly dispersion in the resulting electrocatalyst. The as-synthesized Pt 3 Co/Co@Co–N–C electrocatalyst with a low Pt content (∼7 wt%) shows a positive half-wave potential of 0.922 V and a high limiting current density of ∼6 mA cm −2 . More importantly, compared with commercial Pt/C, Pt 3 Co/Co@Co–N–C features high stability with mass activity increased from 362 mA/mg Pt to 400 mA/mg Pt after 30,000 voltage cycles from 0.6 to 0.9 V vs. reversible hydrogen electrode. The strategy for the construction of oxygen reduction reaction electrocatalyst with Pt and transition metal-doped catalysts provides a new opportunity to design advanced hybrid catalysts for various electrocatalysis processes.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
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IF 5.455
Jipeng Meng,Di Bai,Pahaer Zeyaodong,Chuang Li,Xiao Chen,Changhai Liang
The wirelike, rodlike and corolla-like ZSM-48 zeolites with various SiO 2 /Al 2 O 3 ratios (SARs) were successfully synthesized and exploited for the hydroisomerization of n-hexadecane (n-C 16 ). The influences of metal-acid balance, acid sites quantity, crystal morphology and textural properties on n-C 16 hydroisomerization performance were investigated primarily, via various characterization technique such as XRD , FT-IR, SEM, TEM, N 2 physisorption , NH 3 -TPD, and Py-IR. The C Pt /C A ratios of various catalysts were calculated for the quantified expression of the metal-acid balance, and the acid sites quantity was seriously crucial for the consecutive acid-catalyzed reaction after C Pt /C A ratios satisfied within an ideal range. Large external surface could accelerate the conversion rate, shorten the diffusional constraints and inhibit the cracking. The superiorities of satisfied C Pt /C A values (0.12–0.15), high concentration of acid sites (>230 μmol/g) and large external surface (>120 m 2 /g) persuaded the Pt/Z(P)80, Pt/Z(H)60 and Pt/Z(H)80 samples to demonstrate wonderful hydroisomerization performance with outstanding yield around 80 wt% and excellent i-C 16 selectivity over 91 wt%. Although Pt/Z(W)80 and Pt/Z(R)80 samples owned the relatively small crystal, the gloomy catalytic activity of them was observed due to their relatively low concentration of acid sites and external surface. Moreover, the presence of “key-lock” mechanism was verified by the observations of 7-methyl-pentadecane (7MC15) dominating in isomer products.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Han Sun,Fang Xu,Yongmei Hu,Sui-Jun Liu,Haiping Huang
A series of Pt/Ni-MOF nanocomposites with different atom molar ratio of Pt/Ni were synthesized by the traditional hydrothermal method. Various methods including element mapping, X-ray diffraction (XRD) were employed to characterize the crystal structure and surface morphology of the materials. TEM (Transmission Electron Microscopy) confirms that the Pt nanoparticles are highly dispersed onto the Ni-MOF nanosheet surface, which can provide an abundance of active sites for efficient oxidation of methanol. Electrochemical measurements showed that Catalyst b (the atomic molar ratio of Pt to Ni is 2:1 in the precursor materials) exhibited a higher oxidation current density in MOR and larger electrochemically active surface area (ECSA) than other catalysts with different atomic ratios and commercial Pt/C. Meanwhile, the synthesized catalysts showed long-term activity and good resistance to toxicity.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
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IF 5.8
Li Yang,Ma Hairun,Li Qianwei,Yan Guangxu,Guo Shaohui
Ti/SnO 2 -Sb electrodes possess high catalytic activity and efficiently degrade nitrobenzene (NB); however, their low service life limits their wide application. In this study, we used one-step hydrothermal synthesis to successfully prepare Pt-Nd co-doped Ti/SnO 2 -Sb nanosphere electrodes. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were applied to characterize the surface morphology, microstructure, and chemical composition of the electrodes, respectively. The electrochemical activity and stability of the electrodes were characterized via linear sweep and cyclic voltammetry, electrochemical impedance spectroscopy, and an accelerated service life test; their performance for NB degradation was also studied. An appropriate amount of Pt-Nd co-doping refined the average grain size of SnO 2 and formed a uniform and compact coating on the electrode surface. The oxygen evolution potential, total voltammetric charge, and electron transfer resistance of the Ti/SnO 2 -Sb-Nd-Pt electrodes were 1.88 V, 3.77 mC/cm 2 , and 11.50 Ω, respectively. Hydroxy radical was the main active radical species during the electrolytic degradation of nitrobenzene with Ti/SnO 2 -Sb-Nd-Pt. After Pt-Nd co-doping, the accelerated service life of the electrodes was extended from 8.0 min to 78.2 h (500 mA/cm 2 ); although the NB degradation rate decreased from 94.1 to 80.6%, the total amount of theoretical catalytic degradation of NB in the effective working time increased from 17.4 to 8754.1 mg/cm 2 . These findings reveal good application potential for the electrodes and provide a reference for developing efficient and stable electrode materials.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
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IF 8.129
Xiaopo Niu,Jiuyi Sun,Wenli Zhao,Xinyue Yang,Xiangwen Zhang,Qingfa Wang
Selective deep hydrosaturation of polyaromatics has attracted significant attention in reinforcing the utilization of heavy resources and decreasing the emission of harmful particulate matters . Herein, supported Pt catalysts on diverse oxide supports (SiO 2 , TiO 2 , CeO 2 ) were prepared using an enhanced strong electrostatic adsorption tactics. Strong electronic metal-support interactions (EMSI) in Pt/TiO 2 and Pt/CeO 2 leaded to the well-dispersed electron-deficient Pt δ+ substances and intensified hydrogen spillover capacity, where the most Pt δ+ and spillover hydrogen were acquired on Pt/CeO 2 ascribed to the maximal EMSI and lower oxygen vacancy formation energy heightened the adsorption of metallic Pt. Moreover, the Pt δ+ species displayed promoted H 2 dissociation ability and boosted adsorption energy for aromatic. In phenanthrene hydrogenation, Pt/TiO 2 presented better activity and selectivity to deep hydrosaturation products than Pt/SiO 2 catalyst, indicating the enhancement of EMSI in hydrogenation. Meanwhile, the catalytic properties were further improved over Pt/CeO 2 exhibiting the highest rate of 3.63 × 10 −4 mol·kg −1 ·s −1 . It delivered almost 100% conversion and selectivity to deep hydrogenation at 220 °C because of the maximal of Pt δ+ species with superb dispersion and hydrogen spillover. Furthermore, the DFT calculations manifested the enhanced adsorption of aromatic on Pt δ+ species promoting deep hydrogenation.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Wei Liu,Yajia Ji,Peiyun Sun,Jingwen Zhang,Zhao Dai,Jing Zhao,Haokang Cui,Junfu Wei,Huan Zhang
To effectively enhance the catalytic activity and stability of the heterogeneous catalysts in extremely acidic environments, a novel Pt/COF Janus micromotor catalyst with bowl shape (BSJP) was prepared. The as-synthesized BSJP exhibited excellent catalytic degradation efficiency against methylene blue (MB) as the model substrate, owing to self-propelling motion caused by the unique bowl shape and the concentration effect of pollutants in the bowl-shaped structure. The catalyst has excellent catalytic efficiency. At circumneutral pH, the reaction rate constant of BSJP micromotor was 3.35 times of that of non-propellant particles. At pH = 2, Pt/COF-LZU1 BSJP exhibits the best activity with a maximum removal rate of 98.61 %. Moreover, even under extreme pH conditions (pH < 2), the catalytic degradation efficiency of MB remained high, and the structure and morphology of the catalyst remained unchanged. Importantly, the catalyst exhibited remarkable stability and recyclability. The degradation rate of MB and the removal rate of TOC remained above 90 % during the four cycles. This excellent catalytic performance under extremely acidic conditions was attributed to the physical confinement of Pt nanoparticles by stable COF-LZU1. This work confirms the broad application prospects of COF-carrier materials in water purification.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Jia Liu,Hong Yang,Zhaoyang Song,Jing Sun,Xinwen Guo
In this study, Pt/ZSM-22, Pt/Y, Pt/ZSM-22 + Y (the support is a mechanically blended mixture of ZSM-22 and Y at 1:1 weight ratio), and Pt/ZSM-22 – Y (the support is NaOH + CTAB-treated ZSM-22 + Y) with 0.5 wt % of Pt loading were synthesized and applied as catalysts in the hydroisomerization of n-dodecane. The microstructures and acidic properties of these catalysts were characterized by XRD, TEM, BET, N2 adsorption–desorption isotherms, NH3-TPD, Py-IR, and 27Al-NMR. This study revealed significantly different acidic properties and catalytic performances between the mechanically mixed Pt/ZSM-22 + Y and post-treated Pt/ZSM-22 – Y. In particular, Pt/ZSM-22 – Y not only delivers a high n-dodecane conversion but also significantly enhances the yield and selectivity of multibranched iso-dodecane. This enhanced selectivity of multibranched iso-dodecane may be attributed to the high number of medium-strong acid sites and increased mesopores generated by the post-treatment process.
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Foods
·
2023
·Vol. 12
·期 23
·4260
·
IF 5.2
Yuan Fang,Shusen Ding,Weiran Li,Jingjing Zhang,Hui Sun,Xiaodong Lin
Silver ions (Ag+) exist widely in various areas of human life, and the food contamination caused by them poses a serious threat to human health. Among the numerous methods used for the detection of Ag+, fluorescence and colorimetric analysis have attracted much attention due to their inherent advantages, such as high sensitivity, simple operation, short time, low cost and visualized detection. In this work, Pd/Pt nanoflowers (NFs) specifically responsive to Ag+were synthesized in a simple way to oxidize o-phenylenediamine (OPD) into 2,3-diaminophenazine (DAP). The interaction of Ag+with the surface of Pd/Pt NFs inhibits the catalytic activity of Pd/Pt NFs towards the substrate OPD. A novel dual-channel nanosensor was constructed for the detection of Ag+, using the fluorescence intensity and UV-vis absorption intensity of DAP as output signals. This dual-mode analysis combines their respective advantages to significantly improve the sensitivity and accuracy of Ag+detection. The results showed that the limit of detection was 5.8 nM for the fluorescence channel and 46.9 nM for the colorimetric channel, respectively. Moreover, the developed platform has been successfully used for the detection of Ag+in real samples with satisfactory recoveries, which is promising for the application in the point-of-care testing of Ag+in the field of food safety.Keywords:silver ions;Pd/Pt nanoflowers;fluorescent sensor;colorimetric sensor
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危险品化学品经营许可证（带存储）