Journal of Physical Chemistry C
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2014
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IF 4.835
Fang Niu,Shuiqing Li,Yichen Zong,Qiang Yao
A controlled one-step synthesis of titania-supported palladium (Pd/TiO2) nanoparticles is demonstrated by using a premixed stagnation swirl flame with an ultrafine spray feeding system. The new method produces well-dispersed palladium clusters on the surface of TiO2 particle. The low-temperature methane catalytic oxidation indicates that the flame-made Pd/TiO2 possesses activity apparently higher than that of the impregnated one under the same Pd loading. For the first time, we observe a special pinched hysteresis loop of catalytic activity of Pd/TiO2 nanoparticles from the curves of CH4 conversion versus temperature during heating–cooling cycles. Thermal stability analysis confirms the complex coexistence and transformation of metallic Pd and PdO in Pd/TiO2 particles. Further morphological characterization reveals the oxidation rate is controlled by the metallic Pd content on the particle surface, whereas the deactivation of the catalysts is mainly due to the Pd dispersion decrement. The competition between the Pd dispersion decrement and the PdO reduction at the surface may result in the pinched hysteresis loop of Pd/TiO2 catalysts during low-temperature methane combustion.
研究领域:
催化化学
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纳米材料科学
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环境催化
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能源化学
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表面科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Feipeng Wang,Kelin Hu,Hongcheng Liu,Qi Zhao,Kaizheng Wang,Yuxin Zhang
In this work, we introduced a structure of Pd coated SnO 2 nanofiber rods (NFRs) prepared by electrospinning and magnet sputtering. Pd was first deposited on the obtained nanofibers as a catalyst and then fully dispersed during the resulting of SnO 2 to improve the hydrogen response. The gas sensing tests showed the palladium enhanced the hydrogen response at low temperature (160 °C). When the hydrogen gas concentration was 100 ppm, the limit of detection (LOD) of sensor was as low as 0.25 ppm and the response time was as short as 4 s. Moreover, Pd coated SnO 2 also had excellent hydrogen selectivity and repeatability. The gas sensor was suitable for the detection of hydrogen in low-temperature environment. This work provided a new method for the low temperature hydrogen gas sensor with a fast response and low LOD .
研究领域:
材料科学
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传感器技术
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纳米材料
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气体传感
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功能材料
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电纺丝技术
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3858-3866
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IF 2.3
Lin Baining,Du Xuhong,Huang Zhijing,Liu Gonggang,Zhou Yonghua,Xiao Zhihong,Tu Yusong
Reducing the ignition temperature of aromatic volatile organic compounds (VOCs) is a long-term pursuit for environmental pollution treatment and industrial application. In this paper, the toluene catalytic combustion was ignited at ultra-low temperature of 73 °C over a poplar wood monolithic catalyst with highly dispersed Pd particles coated by nano-thick graphited carbon layer via in-situ carbonization. Combing the characterizations and DFT calculations, the satisfying catalytic performance could be attributed to two aspects: (i) the unrestricted mass transfer of reactant and the high dispersity of Pd were simultaneously ensured in the straight micrometer-channel with abundant surface anchoring groups of poplar wood; (ii) the nano-thick graphited carbon layer on Pd significantly enhanced the oxygen activation. Given the low cost of economic wood and facile preparation technique, this work opened up new alternative for the preparation of highly dispersed noble metal catalyst and the low temperature catalytic combustion of aromatic VOCs in industry. Graphical
研究领域:
环境污染治理
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催化化学
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材料科学
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工业应用
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DOI
高影响因子
Particuology
·
2018
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IF 2.785
Nafeng Wang,Fang Niu,Shuhao Wang,Yun Huang
A nanocatalyst composed of 10 wt% Pd supported on TiO 2 was synthesized using one-step flame spray pyrolysis with a highly-quenched premixed stagnation flame. The as-prepared nanoparticles , having a mean diameter of approximately 10 nm, were then subjected to isothermal oxidation and reduction in a fixed bed reactor. The potential roles of Pd and PdO as well as possible synergistic effects between these two active species were explored during methane conversion. The lowest light-off temperature T 20 was obtained at a Pd ratio of 53% and this result can be reasonably explained based on a surface Pd–PdO site pair mechanism. Additionally, differences in the hysteresis behavior during methane oxidation were noted throughout a heating–cooling cycle over the temperature range of 200–600 °C, such that the degree of hysteresis was strongly correlated with the Pd ratio.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·Vol. 46
·期 7
·5664-5676
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IF 4.939
Shaohui Zhang,Qingxin Li,Haikun Zhou,Wei Xuan,Yili Liang,Zhiyong Xie,Feng Liu
In this paper, Pd catalysts supported on novel composite carbon supports were synthesized by the carbonization and hydrogen reduction of Pd 2+ -doped bacteria containing Ketjen EC600JD, CNT and rGO, respectively. The analysis results show that the prepared catalysts exhibit excellent ORR electrocatalytic performance in acid medium. The best ORR electrocatalytic performance was obtained for Pd/carbonized-bacteria-rGO, which exbibits a mass activity at 0.345 A mg −1 that is 9.58 times higher than commercial Pd/C, and meanwhile displays a better stability than that of Pd/C. The enhanced performance can be attributed to nitrogen doping and flexible carbon-coating microstructure. Herein, we elaborate an efficient and ecofriendly method for the synthesis of electrocatalysts used for oxygen reduction reaction.
研究领域:
材料科学
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电化学
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纳米技术
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催化
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能源材料
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DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 36
·28467-28473
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IF 3.84
Zheng-Jun Wang,Jing-Jing Lv,Jiu-Ju Feng,Ningbo Li,Xinhua Xu,Ai-Jun Wang,Renhua Qiu
Pd–Pt nanodendrites were synthesized by a facile, environment-friendly, one-pot wet-chemical method, without using any seed, template, or toxic organic solvent. The as-obtained bimetallic nanocrystals exhibited efficient catalytic activity toward ligand-free Suzuki cross-coupling reaction in ethanol aqueous solution. A series of biphenyl compounds were obtained with high yields under mild conditions. Furthermore, the catalyst could be easily recovered and reused at least 6 consecutive cycles, nearly without losing its catalytic activity.
研究领域:
纳米催化
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材料化学
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有机合成
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Luming Wang,Guoliang Zhang,Hui Zhao,Gang Wang,Zengxi Li,Chunshan Li
Recently, the development of separable and recycling heterogeneous catalyst for ethylene hydroesterification to methyl propionate (MP) has attracted wide interest of researchers. Herein, a kind of 1, 2-bis(di- tert -butyl phosphinomethyl)benzene (dtbpb)-functionalized hypercrosslinked polymers (HCPs) coordinated with Pd single-atom sites was designed and utilized for heterogeneous hydroesterification of ethylene to MP using CO and methanol. The as-prepared catalyst series were characterized with FT-IR, SEM, XPS, NMR, HRTEM, HAADF-STEM, and XAS, which confirmed the coordination structure of Pd with dtbpb ligand linked to HCPs, as well as the dispersion of Pd in the form of single atoms on the polymer support. The effects of Pd loading and reaction conditions on the ethylene hydroesterification were systematically investigated. As a result, 100 % selectivity of MP with 96.2 % conversion of ethylene were achieved on Pd/dtbpb@HCPs catalyst under the optimal condition and no obvious deactivation behavior was observed during the recycling evaluation. The detailed reaction mechanism of ethylene hydroesterification was proposed by identification of crucial intermediates of Pd-H, Pd-alkyl and Pd-acyl species by employing in-situ DRIFTS. The kinetic study was conducted and the reaction orders of ethylene and CO are corresponding to 0 and 0.5, with the activation energy of 50.7 kJ/mol.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
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IF 1.795
Yanjie Zhou,Wei Wei,Hua Su,Wei Wang
Developing a sensitive and reliable method for accurate determination of H 2 is of great importance for effective and safe utilization of H 2 in various conditions. A fluorescence (FL) assay for H 2 detection was proposed in the present work. It relied on the fact that Pd/C nanocomposites catalyzed fluorogenic conversion of weakly-FL resazurin (RZR) into highly-FL resorufin (RSR) was triggered by H 2 under ambient condition. This method possessed a limit of detection (LOD) as low as 0.06% volume concentration of H 2 in air, far below 4% that is the generally recognized as the lower explosion limit of H 2 -air mixture. A high selectivity to H 2 over O 2 , N 2 , Ar and CO 2 as well as broad linear response range from 0.2% to 80% made this method promising for H 2 sensing in a variety of circumstances. Most importantly, the developed method was able to detect practical H 2 atmosphere (2% H 2 in air) with high reliability under simple operation.
研究领域:
化学
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材料科学
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分析化学
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DOI
高影响因子
iScience
·
2021
·
IF 5.458
Qing Zeng,Danye Liu,Hui Liu,Penglei Cui,Chaoquan Hu,Dong Chen,Lin Xu,Xiang Wu,Jun Yang
Summary Deliberately optimizing the d-band position of an active component via electronic and lattice strain tuning is an effective way to boost its catalytic performance. We herein demonstrate this concept by constructing core-shell Au@NiPd nanoparticles with NiPd alloy shells of only three atomic layers through combining an Au catalysis with the galvanic replacement reaction. The Au core with larger electronegativity modulates the Pd electronic configuration, while the Ni atoms alloyed in the ultrathin shells neutralize the lattice stretching in Pd shells exerted by Au cores, equipping the active Pd metal with a favorable d-band position for electrochemical oxygen reduction reaction in an alkaline medium, for which core-shell Au@NiPd nanoparticles with a Ni/Pd atomic ratio of 3/7 exhibit a half-wave potential of 0.92 V, specific activity of 3.7 mA cm −2 , and mass activity of 0.65 A mg −1 at 0.9 V, much better than most of the recently reported Pd-even Pt-based electrocatalysts.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2026
·
IF 4.6
Lei Luo,Fanggang Zhang,Yuhang Sun,Jiayu Sun,Kai Hong Luo,Yu Cheng Liu,Ran Sui
Soluble catalysts that are readily blended with fuels render significant potentials in long-term storage and engine compatibility to improve ignition and combustion reliability under demanding conditions. However, the mechanistic role of such additives under droplet combustion scenarios that involve evaporation-reaction coupling remains unclear. In this study, single-droplet combustion experiments were conducted using RP-3 aviation kerosene doped with two different soluble catalysts, palladium acetylacetonate (Pd(acac) 2 ) and platinum acetylacetonate (Pt(acac) 2 ), over a range of ppm-level concentrations. Ignition delay time, burning rate and droplet lifetime were systematically quantified to elucidate the influence of catalysts on the fuel combustion behaviors. A stage-resolved analysis was conducted to differentiate ignition onset from quasi-steady burning. The results revealed that both catalysts improve ignition and combustion performance, yet exhibit distinct catalytic roles governed by their thermochemical properties and oxidation states. Earlier ignition is promoted by Pd(acac) 2 due to its low-temperature sublimation and the formation of catalytically active Pd and PdO. The former, however, also competes with the fuel for oxygen at the flame front, inducing an inhibiting effect on droplet burning. These effects together result in a non‑monotonic concentration dependence of the burning rate. In contrast, steadier burning is sustained by Pt(acac) 2 through its stable metallic state Pt. These findings clarify how catalyst decomposition characteristics and oxidation-state stability govern ignition onset and subsequent burning behavior. The present study provides mechanistic insights into fuel-catalyst interactions and guidance for developing fuel-soluble additives to enhance ignition reliability and combustion efficiency in advanced aero-engine systems. Novelty and significance statement This study advances the understanding of fuel-soluble noble-metal catalytic additives by revealing how their transient physicochemical evolution affects single-droplet combustion behaviors. By comparatively resolving the thermochemical evolution of two catalysts, this work demonstrates that decomposition pathways, oxidation-state stability, and catalytic activity collectively modulate stage-specific responses during droplet evaporation, ignition and burning. This stage-resolved perspective moves beyond treating soluble catalysts as static combustion enhancers and clarifies the intrinsic coupling between catalyst evolution and droplet combustion. These mechanistic insights establish transferable principles for the rational design of next-generation fuel-soluble catalytic additives and support an engine-compatible strategy for enhancing high-altitude ignition reliability and combustion efficiency without structural modifications to existing aero-engines. In addition, a U-Net-based deep learning framework is introduced for automatic droplet contour recognition, enabling accurate and efficient droplet combustion diagnostics.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Luoqi Xie,Fei Liu,Shangyan Zhou,Jiamin Wang,Jinjin Sun,Zaiyin Hu
A Pd-MX/GaZnZrO x hybrid catalyst was developed for CO 2 hydrogenation. • MXene acts as a hydrogen-delivery platform beyond a conventional support. • Interfacial coupling promotes H 2 activation and CO 2 conversion synergistically. • A methanol STY of 600.2 mg gcat −1 h −1 was achieved at 320 °C. • DFT and DRIFTS confirm an accelerated formate-mediated pathway. Efficient CO 2 hydrogenation to methanol requires a balanced interface where CO 2 activation is coupled with H 2 dissociation and subsequent hydrogenation. Herein, a Pd-modified MXene (Pd-MX)/GaZnZrO x hybrid catalyst was developed by integrating Pd-modified MXene with Ga-modified ZnZrO x oxide to overcome the limited hydrogen activation ability of Cu-free oxide catalysts. In this architecture, Pd provides H 2 dissociation sites, GaZnZrOx contributes to CO 2 adsorption and activation through its surface oxygen-related sites, and promotes the formation and hydrogenation of formate- and methoxy-related intermediates. Under 320 °C, 3.0 MPa, H 2 /CO 2 = 4:1, and GHSV = 24,000 mL gcat −1 h −1 , Pd-MX/GaZnZrO x achieved 10.5% CO 2 conversion, 83.26% methanol selectivity, and a methanol space-time yield of 600.2 mg gcat −1 h −1 , outperforming GaZnZrOₓ and Pd/GaZnZrO x while maintaining stability over 100 h. Spectroscopic characterization and DFT calculations reveal that MXene coupling enriches electrons on Pd, facilitates H 2 activation, improves interfacial adsorption behavior, and stabilizes formate- and methoxy-related intermediates. These results support a contact-dependent Pd-MX/GaZnZrO x architecture that enhances H 2 activation and facilitates the hydrogenation of CO 2 -derived intermediates over the Cu-free oxide catalyst. Download: Download high-res image (153KB) Download: Download full-size image
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DOI
高影响因子
Biology Direct
·
2026
·Vol. 21
·期 1
·177
·
IF 5.5
Sun Tian-qi,Wu Shuo,Qiao Jing,Liang Gang,Liu Chao-feng,Jiang Hui-yu,Liu Kai-yuan,Wang Hai-long,Pang Min
Non‑small cell lung cancer (NSCLC), particularly lung adenocarcinoma (LUAD), exhibits a high rate of primary resistance to immune checkpoint inhibitors, underscoring the need to decipher the molecular mechanisms of immune evasion. Here, we identify ANKRD49 as a critical regulator of PD‑L1 expression and immunosuppression in LUAD. Immunohistochemical analysis of clinical LUAD specimens revealed that high ANKRD49 expression correlates with reduced CD4 + and CD8 + T cell infiltration, increased FOXP3 + regulatory T cells, and elevated PD‑L1 levels. Functional experiments demonstrated that ANKRD49 overexpression in LUAD cells suppresses T cell cytotoxicity, promotes T cell apoptosis, and impairs granzyme B and IFN‑γ production in vitro. Mechanistically, ANKRD49 directly binds the transcription factor MEF2A via its second ankyrin repeat domain, upregulates MEF2A expression, and promotes its transcriptional activity at two specific sites within the PD‑L1 promoter. Chromatin immunoprecipitation and luciferase reporter assays confirmed that MEF2A directly activates PD‑L1 transcription in an ANKRD49‑dependent manner. In subcutaneous and metastatic mouse models, ANKRD49 overexpression accelerates tumor growth and metastasis, while PD‑L1 blockade reverses these effects and restores antitumor immunity. Collectively, our findings establish the ANKRD49–MEF2A–PD‑L1 axis as a novel driver of immune evasion in LUAD, and identify ANKRD49 ankyrin repeat domain 2 as a potential therapeutic target for overcoming immunotherapy resistance.
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DOI
高影响因子
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