Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 3
·465-470
·
IF 4.239
Hang Zhang,Shimin Kang,Jinxia Fu,Yunbing He,Xiangxuan Huang,Jie Chang,Yongjun Xu
Poly(butylene succinate) (PBS), a biodegradable plastic, is expected to have a huge consumer product market in the near future. In this work, PBS was found to be an excellent source of producing valuable tetrahydrofuran (THF), through a solvent-less catalytic hydrogenolysis process over a Pd/C catalyst. A high THF yield, 59.5 wt%, was achieved via a simple one-pot reaction under mild temperature conditions (240 °C). This technique provides a distinctive but important method for the green production of THF from spent PBS.
研究领域:
化学工程
·
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Hanping Chen,Haoyu Xiao,Sunwen Xia,Danyan Wu,Yingquan Chen,Xianhua Wang,Haiping Yang,Jianjun Xiao
Catalytic hydrotreatment under supercritical ethanol conditions is an effective method for improving the performance of wood tar. In this study, the physicochemical properties of industrial wood tar were characterized, and the hydrotreatment process of wood tar under supercritical ethanol was investigated. In the presence of Pd/C and H2, with the reaction temperature of 320 °C and the reaction time of 3 h, the amount of light component in wood tar increased significantly from 55 to 77 wt %, the ratio of hydrogen to carbon increased, and the oxygen content decreased from 27 to 20 wt %. During the Pd/C catalytic upgrading process, the composition and distribution of light phenols changed obviously. Dimethoxy phenols tended to react to form monomethoxy phenols, and monomethoxy phenols tended to react to form alkylphenols.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 4
·期 6
·1372-1377
·
IF 4.136
Zulin Da,Xiangheng Niu,Xin Li,Wenchi Zhang,Yanfang He,Jianming Pan,Fengxian Qiu,Yongsheng Yan
Graphical Give it some juice : Juice extracted from discarded orange waste is simultaneously used as a natural reductant and a support precursor for the green and low-cost synthesis of active Pd/biomass-derived carbonaceous hybrids. The fabricated Pd/C(OJ) hybrid is composed of small Pd nanoparticles highly dispersed among the N-doped carbonaceous support, exhibiting higher catalytic activity and preferable performance durability for methanol electro-oxidation than commercial Pd/C. Facile, green, and low-cost synthesis of advanced electrocatalysts is widely considered an urgent issue and a current challenge for clean energy conversion. Here, we report the green fabrication of a new Pd/C(OJ) hybrid, using orange juice (OJ) simultaneously as a natural reductant and a support precursor, for the methanol oxidation reaction (MOR) in alkaline media. The juice extracted from discarded moldy oranges is capable of reducing the [PdCl 4 ] 2− species into metallic Pd through a simple hydrothermal reaction, and then becomes the nitrogen-doped carbonaceous support after pyrolysis for active catalyst loading. In the synthesized Pd/C(OJ) hybrid, Pd nanoparticles with a mean size of 7.3 nm are highly dispersed throughout the support, providing a larger electrochemically active surface area than commercial Pd/C. As a result, the Pd/C(OJ) electrocatalyst exhibits 1.78 times the mass activity of the latter for the MOR. The preferable performance durability of Pd/C(OJ) is also verified by using cyclic voltammetry and simulative startup−shutdown measurements.
研究领域:
材料科学
·
催化化学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ling Yang,Jing Zou,Zheng Yin,Linjun Shao,Guiying Xing,Xian-Man Zhang
Chitosan has emerged as a promising support for transition metal catalysts, owing to its abundant natural occurrence, robust chelating capacity, and inherent biodegradability. In this work, chitosan-supported palladium microspheres (Pd@MicroCS) were successfully fabricated via an inverse emulsification method. The synthesis involved the incorporation of Pd2+ cations into chitosan microspheres, followed by reduction to active Pd0 species using NaBH4. The surface morphology of the resultant microspheres was characterized by scanning electron microscopy (SEM), while the dispersion of palladium nanoparticles was analyzed via transmission electron microscopy (TEM). The catalytic performance of this novel Pd@MicroCS catalyst was evaluated using the Heck coupling reaction. Under optimized reaction conditions, Pd@MicroCS exhibited exceptional catalytic activity in the coupling of substituted iodobenzene with alkenes. Notably, the spherical architecture of Pd@MicroCS facilitated straightforward separation and recycling. The catalyst maintained a coupling yield over 90% even after 14 consecutive reuse cycles, with minimal palladium leaching (<2.0 wt.%) in each cycle. Overall, this study presents a facile strategy for the preparation of a highly active and stable chitosan-supported palladium microsphere catalyst.
研究领域:
催化化学
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高分子化学
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材料科学
·
有机合成
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环境化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 21
·11659-11671
·
IF 6.895
Bowei Pan,Fuyi Chen,Bo Kou,Junpeng Wang,Quan Tang,Longfei Guo,Qiao Wang,Zhen Li,Weiqi Bian,Jiali Wang
High-performance Pd-based nanocatalysts for alkaline methanol and formate fuel cells have stimulated widespread attention. Hence, a series of ternary Pd–Au–Ag nanoalloys have been synthesized on carbon nanotubes, which demonstrate promising activity and unexpectedly high stability for the formate oxidation reaction (FOR) in alkaline medium. The ternary Pd3Au3Ag1 nanoalloy catalyst showed an initial mass activity of 4.51 A mgPd−1 and a retained mass activity of 1.32 A mgPd−1 after chronoamperometric measurement for 3600 s, which are superior to the best values for all FOR catalysts reported so far. The Pd3Au3Ag1 catalyst also showed a good specific activity of 4.32 mA cm−2 for the methanol oxidation reaction. Furthermore, surface reconstruction of the Pd3Au3Ag1 nanoalloy was observed during FOR, where the activity of Pd3Au3Ag1 catalysts increased up to 33% and the cycling durability retained 55% after cyclic voltammetry with the upper potential of 1.7 V. The FOR enhancement is attributed to the formation of mixed oxidation-state Ag sites and the increase in the Pd surface coverage, and provides a new prospect for the design of ternary nanoalloy electrocatalysts for various fuel oxidation reactions.
研究领域:
材料科学
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电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Aozhou Wang,Kaisheng Yao,Shuaibo Li,Qi Wang,Tianhang Han,Weiwei Lu,Haili Zhao
Furfuryl alcohol (FA) is an important chemical and has extensive applications in varied fields. To realize the highly selective hydrogenation of furfural (FF) to produce FA, the key is the preparation of the catalysts with excellent performance. Herein, a very simple wet chemical method is developed for the one-step preparation of PdAg nanosponges (NSs). Specifically, with Pd(OAc) 2 and AgNO 3 as precursors, and ethylene glycol (EG) as both solvent and reducing agent, PdAg NSs can be grown and assembled at mild temperature of 40 °C. Throughout the reaction, no any surfactants and additional reducing agents are applied. The as-prepared PdAg NSs possess 3D self-supported alloy structures, “clean” surface, abundant pores, high specific surface area and rich defects. In the FF hydrogenation reaction at 60 °C under 1.5 MPa H 2 pressure in the mixed solvent of ethanol and water (1 : 4 in volume ratio), the self-supported PdAg-1 NSs (1 : 1 in Pd/Ag molar ratio) exhibit superior catalytic performance than other PdAg NSs, pure Pd sample and commercial Pd/C (10%). With PdAg-1 NSs as catalyst in the absence of support, 100% FF can be converted and the selectivity toward FA is as high as 97.1% at 36.0 h of reaction. After 4 cycles, PdAg-1 NSs still maintain the high catalytic activity in FF hydrogenation and high selectivity toward FA, which may originate from the 3D self-supported structures, high specific surface area, “clean” surface, rich defects and electronic synergistic effect between Pd and Ag. This simple fabrication of PdAg NSs introduces new ideas for the synthesis of other nanostructured bi- and multi-metallic catalysts for highly selective FF hydrogenation to FA and other advanced applications.
研究领域:
催化化学
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材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Tianhang Liu,Kaisheng Yao,Hang Li,Qi Wang,Tianhang Han,Aozhou Wang,Haili Zhao,Weiwei Lu
Developing a simple, environmentally friendly, and mild method to one-step prepare bimetallic nanoframes is pretty important but still technically challenging. In this paper, a simple and easy-to-operate ionic liquid (IL)-regulated protocol is proposed to fabricate Au–Pd superbranched trigonal nanoframes (STNFs) in water at room temperature. In the aqueous solution containing precursors (Na2PdCl4 and HAuCl4) and a reducing agent (ascorbic acid), a common IL 1-octyl-3-methylimidazolium chloride ([C8mim]Cl) was used to guide the anisotropic growth and construction of Au–Pd STNFs, brightly showing green and energy-saving characteristics. Au–Pd STNFs take shape as unique two-dimensional (2D) trigonal frameworks containing multilevel orderly branches. It is found that [C8mim]Cl is crucial to the formation of Au–Pd STNFs. Owing to the unique structures, high specific surface areas, large freestanding sizes, and probably electronic effects between Au and Pd, Au–Pd STNFs-1 exhibit dramatically enhanced catalytic activity, selectivity, durability, and convenience for recycling in the 4-nitrostyrene hydrogenation reaction. Specifically, 4-nitrostyrene can be converted completely only within 5.0 min at 25 °C under atmospheric pressure, and the selectivity toward 4-nitroethylbenzene is as high as 100% and maintains good performance after five cycles. It is expected that well-constructed Au–Pd STNFs also display advanced potential in other applications.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 43
·22618-22624
·
IF 8.867
Dong Wang,Xin Wang,Yue Lu,Changsheng Song,Jie Pan,Chilin Li,Manling Sui,Wei Zhao,Fuqiang Huang
Noble metal catalysts have extraordinary catalytic activity but suffer from high cost; therefore single atom catalysis attracts tremendous attention. Here, we propose atom-scale dispersed palladium (Pd) in a layered TaS2 lattice to form new compounds of PdxTaS2, whose crystal structure was resolved by powder X-ray diffraction. The electrical conductivity of metallic Pd0.1TaS2 (1.36 × 104 S m−1) is twice as large as that of TaS2 (6.18 × 103 S m−1). This compound applied as a new electrocatalyst for the hydrogen evolution reaction (HER) exhibits excellent catalytic performance with an onset overpotential of 77 mV, superior to those of other catalysts such as TaS2 (295 mV) and Pd-loaded TaS2 (114 mV). Density functional theory calculations reveal that the interaction of Pd-4d and Ta-5d orbitals results in the upshift of the Fermi level (TaS2versus Pd0.1TaS2) to decrease the barrier height for the HER. Furthermore, the hybridization of Pd-4d and S-3p orbitals builds up pathways along the c axis to improve the conductivity and promote HER performance. It is noted that the amount of Pd used in Pd0.1TaS2 is only 4 wt%, compared with 20 wt% in commercial Pd/C catalysts, which is beneficial for its practical application.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 108
·63048-63054
·
IF 3.708
Liang Ren,Fan Yang,Chunxia Wang,Yongfeng Li,Hailing Liu,Zhiqiang Tu,Liqiang Zhang,Zhichang Liu,Jinsen Gao,Chunming Xu
We have developed an environmentally-friendly method for the synthesis of Pd nanoparticle (Pd NPs) decorated different graphene supports, and the morphology and structure of the hybrids are characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and elemental mappings. Four hybrid materials based on graphene foam (GF), oxidized graphene foam (OGF), graphene oxide (GO) and reduced graphene oxide (RGO) have been used to catalyze Heck coupling reactions, and the effect of support on the activity of the hybrid material has been studied. Our results have revealed that Pd NP decorated OGF (Pd/OGF) is the most active catalyst, showing better performance than the commercial Pd/C catalyst. More importantly, the Pd/OGF catalyst has been successfully used for one-pot synthesis of dibenzyls with different aryl bromides and olefins, which has simplified the separation and purification process and realized a green organic synthesis process.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Pei Song,Lei Liu,Ai-Jun Wang,Xi Zhang,Si-Yuan Zhou,Jiu-Ju Feng
In this work, three-dimensional trimetallic Pt–Pd–Co alloyed nanoflowers are fabricated by a facile one-pot solvothermal strategy, with the assistance of oleylamine as the solvent, surfactant, and reducing agents, along with cetylpyridinium chloride (CPC) as the co-surfactant and shape-directing agents. Their morphology and crystal structure were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning transmission electron microscope (STEM), and X-ray photoelectron spectra (XPS) in details. The respective electrochemically active surface area (ECSA) is estimated to be 32.53 m 2 g −1 , and current density is 132.91 mA cm −2 for the electrooxidation of ethylene glycol (EG). These values are much higher than those of PtPdCo nanoparticles, PtPd nanoparticles, commercial Pt black, and Pd black under the identical conditions, showing the improved catalytic activity of Pt–Pd–Co nanoflowers. The excellent performances are attributed to the specific structure and synergistic interactions of the trimetallic alloy. The as-prepared nanoflowers can serve as a promising electrocatalyst in fuel cells.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 4
·1190-1201
·
IF 2.911
Zhang Yuanyuan,Yi Qingfeng,Deng Zhongliang,Zhou Xiulin,Nie Huidong
Abstract Multi-walled carbon nanotube (CNT) supported Pd–Ag–Sn nanocatalysts including Pd/CNT, Pd 7 Ag 3 /CNT, Pd 7 Sn 2 /CNT, Pd 7 Ag 1 Sn 2 /CNT, Pd 7 Ag 2 Sn 2 /CNT and Pd 7 Ag 3 Sn 2 /CNT, have been prepared in a mixture solution of ethylene glycol and water by NaBH 4 reduction method. The samples have been characterized by using scanning electron microscopy, transmission election microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Compared to the Pd/CNT and Pd 7 Ag 3 /CNT catalysts, metal particles of the ternary Pd 7 Ag 2 Sn 2 /CNT catalyst are more uniformly dispersed on the surface of CNTs and present the size of ca. 2.4 nm. Both binary Pd–Ag and ternary Pd–Ag–Sn catalysts exhibit the alloying of Pd and Ag. Electrochemical activities of the prepared catalysts for ethanol oxidation in alkaline media were investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy. Results show that Pd 7 Ag 2 Sn 2 /CNT catalyst reveals the highest current density of ethanol oxidation among the prepared catalysts and presents a high steady-state current density for ethanol oxidation from CA measurement, which is 33 times higher than the commercial Pd/C. Also, Pd 7 Ag 2 Sn 2 /CNT and Pd 7 Ag 3 Sn 2 /CNT catalysts show a large ethanol oxidation peak current density (against Pd loading) of 2.29 and 2.30 A mg −1 , indicating the high usage efficiency of Pd particles for ethanol oxidation. Graphical Abstract
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Kunpeng Song,Zhijuan Zou,Deli Wang,Bien Tan,Jingyu Wang,Jian Chen,Tao Li
The usage of noble metal catalysts for oxygen reduction reaction (ORR) can be minimized by supporting them on porous carbon. Herein, a simple and industrially scalable approach for preparation of porous carbon supports is developed by directly pyrolyzing microporous organic polymers (MOPs). The rigid aromatic building blocks in MOPs function as self-templates to retain the high surface area and regular pore distribution during carbonization to the formation of high quality microporous carbon framework. The electrochemical performance of Pd catalysts supporting on MOPs-derived carbons is evaluated and compared with commercial products, indicating the superiority of MOPs as carbon precursor. Significant difference in ORR activity is observed among three types of MOPs due to the impact of framework and heteroatom. The highest performance of Pd/CKN catalyst is attributed to heteroatom-induced altering of electronic structures besides the stable skeleton.
研究领域:
材料科学
·
电化学
✓ 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）