CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Zhiqiang Zhang,Yongpeng Xu,Wenxin Shi,Wei Wang,Ruijun Zhang,Xian Bao,Bing Zhang,Li Li,Fuyi Cui
The Pd–Cu/γAl 2 O 3 catalysts were prepared by impregnation method and introduced into the cathode chamber of a divided electrochemical denitrification cell with two graphite plates as the cathode and anode, to enhance the nitrate removal efficiency and N 2 selectivity. The Pd–Cu/γAl 2 O 3 catalysts were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area measurements (BET) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). In the rationally designed electrochemical-catalytic (ECC) system, the as-prepared catalyst could significantly enhance the nitrate degradation rate to 1.08 mg/L at current density of 10 mA/cm 2 , which was approx. 2.5 times compared with the electrochemical (EC) system without catalysts adding in. Additionally, a higher nitrogen selectivity of 80.37% was obtained under the same experiment condition. The improved performances were likely due to the presence of a catalytic reduction reaction of nitrate with the appropriate amount of hydrogen generated by electrolysis as reductant. Significantly, the current efficiency was calculated and enhanced value of 20–40% (depended on current density) was obtained in the ECC process with a catalyst content of 1.0 g/L.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Nan Mei,Bing Liu
Catalytic reduction of nitro compounds to the amines is of high importance in modern synthetic chemistry . In this study, an efficient method was developed for the transfer hydrogenation of nitro compounds over a magnetic Pd catalyst by the use of NaBH 4 as the hydrogen donor . Full nitrobenzene conversion and high selectivity (>99%) of aniline were produced after 1 h at 60 °C in ethanol. The reductions are successfully carried out in presence of a wide variety of other reducible functional groups in the molecule, except halogen and vinyl substitute nitrobenzene. Kinetic studies indicated the active energy for the transfer hydrogenation of nitrobenzene was 20.93 KJ mol −1 . The transfer hydrogenation of nitrobenzene was confirmed to proceed via azobenzene as the intermediate. More importantly, the catalyst was very stable without the loss of its catalytic activity .
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APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Lujie Liu,Hui Lou,Min Chen
Nano-Pt and Nano-Pd particles were introduced to modified multiwalled carbon nanotubes via co-impregnation method for hydrogenation of furfural in liquid phase using ethanol as a solvent. Different transition metal (Cr, Mn, Fe, Co, Ni) was used as promoters using Pt/MWNT and Pd/MWNT catalysts and various supports were also compared to further investigate the hydrogenation process of furfural. Among the catalysts investigated, Pt–Fe/MWNT (Pt: 0.5 wt%) showed highest conversion and selectivity to furfuryl alcohol (yield of 87.4%), while Pd–Ni/MWNT (Pd: 0.5 wt%) catalysts exhibited the best catalytic performance (83.3% yield of tetrahydrofurfuryl alcohol) under the optimized conditions of 30 bar hydrogen and 5 h, at 100 and 130 °C, respectively. Synergistic effect of bimetallic catalysts has been utilized to improve catalytic activity and stability. The extremely active for the selective hydrogenation of furfural over Pt–Fe/MWNT and Pd–Ni/MWNT catalyst might be attributed to active crystal planes exposed over Pt and Pd promoted by Fe and Ni. Catalysts have shown stable activity and selectivity after 5 cycles using Pt–Fe/MWNT and Pd–Ni/MWNT catalysts. Moreover, we suggest that acid sites of conventional supports might have an impact on furfural conversion.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 3
·627-634
·
IF 5.773
Renfeng Nie,Xiaolun Peng,Haifu Zhang,Xiaolong Yu,Xinhuan Lu,Dan Zhou,Qinghua Xia
Nitrogen-enriched highly mesoporous carbons (NMCs) are synthesized via the one-pot carbonization of biomass-derived glucose and harmless melamine with ZnCl2 as the porogen agent and catalyst. NMC contains an N content of 15.4 wt% and specific surface area of 1017 m2 g−1 with the mesopore volume proportion of 92.1%. Owing to its rich N species and high mesoporosity, NMC can be adapted as a proper support for the fabrication of well-dispersed Pd catalysts for the transfer hydrogenation of vanillin in the water phase with formic acid (FA) as the hydrogen donor. For example, Pd/NMC exhibits 2.9 times higher activity in comparison to nitrogen-free catalysts, and affords 100% vanillin conversion with 2-methoxy-4-methylphenol (MMP) as the sole product. The Pd/NMC catalyst demonstrates enhanced acid-resistance in acid media and adsorption of substrates. It is found that the electron-deficient Pd (Pdδ+) percentage is affected by the N species, and the strong Pd–N interaction generates the co-existence of Pdδ+ and metallic Pd (Pd0), which results in Pd/NMC as a novel bifunctional nanocatalyst for both FA dehydrogenation and vanillin hydrogenation.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Laizhao Guo,Shaojie Chu,Yun Li,Wentao Huang,Xiang Wang
Kiwifruit, renowned for its antioxidant properties and nutritional richness, faces challenges in maintaining quality during transportation, often leading to suboptimal products reaching the market. To address this issue, a wireless transmission flexible ethylene monitoring device (WFEMD) was developed. This device comprises a flexible ethylene gas sensor and a signal transmission processing unit integrated with electronic components, enabling real-time monitoring capabilities. In this study, the catalytic activity of Pd and Pd/Ti heterojunctions was leveraged to enhance the ethylene gas sensing. The impact of Ti3C2Tx modified with varying masses of Pd nanoparticles on ethylene gas response levels was investigated. The signal transmission processing unit, fabricated by using the laser direct-writing method, was optimized to collect signals from the flexible ethylene gas sensor, convert them into corresponding ethylene concentrations, and transmit data via an antenna. By introducing a random forest (RF) classification algorithm, a remarkable 97.5% accuracy in predicting kiwifruit ripeness grades was achieved. The algorithm facilitated precise classification by collecting key parameters such as ethylene and CO2 during transportation. The WFEMD enables real-time acquisition of kiwifruit ethylene gas information, which is transmitted wirelessly for data visualization and traceability via mobile terminals. This empowers managers with timely insights into ethylene emissions and ripeness predictions, facilitating informed decision-making processes.
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PubMed
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yanhu Li,Mei Chen,Linghong Xue,Xu Li,Qingji Wang
Metal oxide semiconductor (MOS) sensor, one of the most widely used gas sensors, faces significant challenges in achieving lower detection limit. Addressing this issue, the utilization and strategic design of bimetallic catalysts present a promising avenue. In this paper, Pd-Pt was in-situ grown on ZnO nanoflowers directly prepared on planar substrate and a sensor for detecting acetone was developed. The test results reveal that the Pd-Pt/ZnO nanoflowers sensor exhibits a remarkable 107.6 response to 100 ppm acetone at 350 °C, while presenting a rapid response (15s). Moreover, this sensor demonstrates excellent capability in detecting acetone at concentrations as low as 1 ppb, showcasing impressive gas-sensing performance. The response of the sensor to 100 ppm acetone is twice that of ethanol at the same concentration. The exceptional performance of the sensor results from its distinctive nanoflower structure and the catalytic effect of the Pd-Pt, which offers an extensive surface area and enhances the rate of redox reaction for gas molecules. This in-situ grown method has great potential for improving the gas-sensing performance in gas sensor.
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ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Bai Chen-Chen,Lang Jin-ye,Wang Xin-yu,Zhao Jia-meng,Dong Lin-Yi,Liu Jun-Jie,Wang Xian-Hua
Abstract The present article introduced an natural enzyme-covered/amino-modified Pd–Pt bimetallic-doped zeolitic imidazolate framework (NAPPZ) for ultrasensitive and specific detection of glucose. The dodecahedral nanomaterial zeolitic imidazolate framework (ZIF-8)-loaded Pd–Pt bimetallic nanoparticles endowed the composite with peroxidase-like activity. The modification with glucose oxidase (GOx) facilitated the rapid access of H 2 O 2 produced through glucose oxidation to the Pd–Pt nanoparticles vicinity reducing diffusion. GOx specifically catalyzes the transformation of glucose into H 2 O 2 , which then H 2 O 2 rapidly migrates to the Pd–Pt nanoparticles, catalyzing the oxidation of colorless o-phenylenediamine into the orange–yellow product 2,3-diaminophenazine. Based on the aforementioned cascade reaction, the NAPPZ and NAPPZ based on ChOx were utilized for detecting glucose in human urine samples and cholesterol in milk, respectively. The NAPPZ strategy presented a broad detection range (20–1100 μmol L −1 ) and a low detection limit (15.9 μmol L −1 ) for glucose, and the NAPPZ based on ChOx strategy approach offered a broad detection range (10–500 μmol L −1 ) and low detection limit (6.4 μmol L −1 ) for cholesterol. Therefore, this novel method holds significant potential in the areas of clinical diagnostics and food safety. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xue Zhai,Tianyu Zhou,Jia Chen,Peng Su,Xinke Li,Hao Su,Biqing Bao,Lixing Weng,Lianhui Wang
Conventional immunotherapies for metastatic cancers remain highly challenging due to insufficient immunity response. Herein, we show that Pd-FePorP significantly triggers ferroptosis mediated-ICD and cooperatively reverses EMT, leading to efficient abrogation of tumor spreading, metastatic invasion and improved immunotherapy outcomes. The maximum catalytic velocity ( V max ) of Pd-FePorP was improved to ∼9.8-fold through in-situ ligand exchange strategy, which eventually induces specific ferroptosis-mediated ICD. Excitingly, Pd-FePorP reverses epithelial-mesenchymal transition (EMT) by upregulating cytokeratin and E-cadherin through inhibition of PI3K/AKT signaling pathway, which could thus interrupt the metastasis cascade to significantly inhibit primary tumor cells migration and invasion. In mouse model, the pretreatment with Pd-FePorP induces EMT reversal in tumor cells, thereby impeding their recolonization in lung tissues and leading to 99 % reduction in lung metastasis nodules. Additionally, when combined with ICD effect induced by ferroptosis, Pd-FePorP synergistically improves the immunosuppressive microenvironment in primary tumor, resulting in effective inhibition of lung metastasis. Our approach may open a new avenue to explore nanozyme as synergistic therapeutic strategy through cooperation between catalysis of smart nanozyme system and EMT reversal for combating cancer metastasis.
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Desalination and Water Treatment
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2024
·
IF 1
Jinkui Zhong,Xinyue Zhou,Caiya Zhu,Yin Zhang,Jiawen He,Yuanhu Gao,Liguo Wang
2,4-dichlorophenol (2,4-DCP) is a toxic and harmful organic intermediate widely used in industrial production. Recently, the utilization of nano-zero-valent iron (NZVI) for 2,4-DCP treatment has gained significant popularity, but the deactivation and agglomeration of NZVI always appear and continue to present challenges. To address these issues, sodium carboxymethyl cellulose (CMC) and noble metal catalyst Pd are used as stabilizers to improve the removal efficiency of NZVI on 2,4-DCP. The CMC-modified nanoscale Pd/Fe bimetal (CMC-Pd/Fe) particles were prepared by the liquid phase reduction method and characterized by scanning electron microscopy (SEM), Fourier infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The results showed that the addition of Pd and CMC succeeded in ameliorating the aggregation of NZVI. A five-level-four-factor central composite design (CCD) of response surface methodology (RSM) was used to optimize the removal of 2,4-DCP by CMC-Pd/Fe and explored the factors influencing the removal of 2,4-DCP, including the amount of catalyst, the initial pH of the system, the time of reaction, and the initial concentration of 2,4-DCP. A statistically significant and well-fitting quadratic regression model was successfully constructed to predict 2,4-DCP removal efficiency. The high F -value of 14.35, very low p- value (<0.0001), nonsignificant Lack of Fit, and appropriate coefficient of determination of 0.9399 demonstrate a good correlation between the experimental and predicted values of the proposed model. The analyses of variance reveal catalyst amount and reaction time have a positive effect on the removal efficiency of 2,4-DCP and the CMC-Pd/Fe catalyst amount shows the most apparent significance, with PC (percent contribution) greater than 26. Conversely, pH and 2,4-DCP concentration have a negative impact on the removal process. The optimum condition is 1.10 g/L of catalyst amount, 5.63 of pH, 2.31 h of reaction time, and 20 mg/L of initial 2,4-DCP concentration. The validation results from parallel experiments showed that the average removal efficiency of 2,4-DCP reached 96.32% under the optimal conditions.
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Molecular Catalysis
·
2024
·
IF 3.9
Yongyong Shi,Donghai Jiang,Liming Zhou,Jingyun Zhao,Jun Ma,Qian Lin,Hongyan Pan
A well-defined structural morphology can significantly construct a special catalytic micro-reaction environment to enhance the catalytic performance of Pd catalyst in the direct synthesis of hydrogen peroxide from hydrogen and oxygen (DSHP). In this study, SiO 2 was used as a rigid template, PdCl 2 as the Pd precursor, and dopamine hydrochloride (DA) as the carbon and nitrogen source to synthesize a nest-shaped hollow-encapsulated Pd catalyst named Pd Multi @ONHCS. This catalyst was successfully constructed via high-temperature pyrolysis of poly dimethyl diallyl ammonium chloride (PDDA), which generated a blasting effect crucial for this formation. Characterization analysis, catalytic performance evaluation experiment, and molecular dynamics simulation were conducted to explore the structure-performance relationship of Pd Multi @ONHCS catalyst in DSHP. Both experimental and simulation results consistently showed that the nest-shaped hollow structure of Pd Multi @ONHCS catalyst created a distinctive catalytic microreactor environment with a spatial mass transfer constraint, which was not only conducive to adsorption and enrichment of H 2 and O 2 at Pd active sites to produce H 2 O 2 . In addition, the generated H 2 O 2 can be desorbed from Pd active sites in time and rapidly diffused into the reaction solution, effectively inhibiting the dissociation of species containing O O bonds on the Pd surface, resulting in severe hydrogenation and decomposition side reactions, and improving H 2 O 2 productivity and selectivity.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2012
·Vol. 26
·期 9
·478-482
·
IF 2.061
Wenyi Chu,Xinmin Li,Yanjun Hou,Hua Wang,Hongyu Li,Xiaobin Yuan,Zhizhong Sun
Pd/C-catalyzed Suzuki–Miyaura cross-coupling between aryl bromides and arylboronic acids in 50% methanol aqueous solution proceeded smoothly in the presence of 18-crown-6. Various aryl bromides bearing electron-withdrawing groups and electron-donating groups coupled with arylboronic acid in high yields. In addition, the catalyst could be recycled five times without loss of activity. Copyright © 2012 John Wiley & Sons, Ltd.
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CATALYSIS LETTERS
·
2012
·Vol. 143
·期 2
·200-205
·
IF 2.242
Zeng Yan,Wang Yanhua,Xu Yicheng,Song Ying,Jiang Jingyang,Jin Zilin
Abstract A thermoregulated ionic liquid and organic biphasic system composed of ionic liquid [CH 3 (OCH 2 CH 2 ) 16 N + Et 3 ][CH 3 SO 3
− ] (IL PEG750 ) with IL PEG750 -stabilized Pd nanoparticles and organic solvents, which allows for not only a highly efficient homogeneous catalytic reaction, but also an easy biphasic separation and reuse of catalyst attributed to the thermoregulated phase-transition property of the system, was employed for Heck reaction. The IL PEG750 -stabilized Pd nanoparticle catalyst exhibited high efficiency, more importantly, after reaction the Pd nanoparticle catalyst could be separated from products by simple phase separation and recycled for six times without evident loss of activity. Graphical Abstract A thermoregulated ionic liquid and organic biphasic system containing [CH 3 (OCH 2 CH 2 ) 16 N + Et 3 ][CH 3 SO
- 3
] (IL PEG750 )-stabilized Pd nanoparticles was applied to Heck reaction for the first time. The Pd nanoparticle catalyst exhibited high efficiency and good recyclability.
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