Catalysts
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2023
·Vol. 13
·期 4
·651
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IF 3.9
Jiaqi Du,Yidan Peng,Xu Guo,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan,Wenchao Peng,Yang Li
Researchers studying heterogeneous catalysis are intrigued by single-atom catalysts (SACs) due to their ultrahigh atomic utilization. However, only a few reports on SAC-catalyzed classical organic transformations are available. In this work, atomically dispersed Pd sites are confined to a ZrO2hybridized N-doped carbon skeleton with a smart design. UiO-66-NH2is used to anchor Pd atoms by the coordination of the donor atoms including lone pairs of electrons and metal atoms. Subsequently, the in situ introduction of ZrO2doping is achieved using pyrolysis, which helps improve the catalytic performance by modulating the electronic state. The Pd@ZrO2/N–C catalyst obtained from the unique design exhibits a high yield (99%) in eco-friendly media with an extremely low noble metal dosage (0.03 mol% Pd) for the Suzuki reaction. Moreover, Pd@ZrO2/N–C remains highly active after being reused several times and possesses versatility in a variety of substrates. This strategy offers a feasible alternative to designing SACs with atomically dispersed noble metals for heterogeneous reactions.Keywords:palladium;heterogeneous catalyst;Suzuki reaction;ZrO2doping;N-doped carbon
研究领域:
化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yujun Cheng,Jianping Guan,Zhipeng Zhang,Ruili Li,Yao Yao,Xiaotong Sun,Qi Liu,Xiaoqing Chen
Constructing materials that possess both catalytic properties and surface plasmonic active structures presents an essential requirement in the field of in situ surface-enhanced Raman spectroscopy (SERS) monitoring. In this work, we developed a novel black raspberry-like bifunctional nanoreactor platform (HPRS@Au–Pd) with enhanced surface-enhanced Raman spectroscopy (SERS) activity (EF = 3.11 × 109) and excellent catalytic performance (e.g., |K| = 1.72 × 10–2 s–1 for 4-BTP). This platform enables sensitive and real-time monitoring of Suzuki reactions, providing an efficient and stable system for mechanistic investigations. By fitting a first-order kinetic model, we quantitatively analyzed the reaction kinetics of haloarenes on Pd NPs, revealing the direct involvement of surface-bound Pd NPs in the catalytic process. Furthermore, 4MPBA-blocking experiments using haloarenes devoid of functional groups demonstrated the absence of catalytic activity from dissolved Pd species, conclusively supporting the heterogeneous nature of the reaction. This work extends the applicability of the conclusion regarding heterogeneous catalysis to a broader range of substrates, offering valuable insights into the design and optimization of dual-functional nanoreactors. Beyond the Suzuki reactions, the versatility of this platform opens avenues for applications in other catalytic reactions, showcasing its potential in advanced catalytic studies and real-time monitoring.
研究领域:
化学
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材料科学
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 56
·29563-29570
·
IF 3.708
Jingjing Lin,Tao Mei,Meijiao Lv,Chang'an Zhang,Zhenfeng Zhao,Xianbao Wang
A simple two-step method for the preparation of Pd nanoparticles supported on reduced graphene oxide (Pd/RGO) is reported. Well-dispersed and size-controlled Pd/RGO was synthesized through reduction of PdO nanoparticles on graphene oxide (PdO/GO) with hydrazine hydrate and ammonia at 80 °C for 4 hours. The PdO/GO was successfully prepared by mixing GO and Pd(NO3)2 aqueous solution together without adding any additional chemicals. The sizes and morphologies of PdO nanoparticles can be controlled by changing the concentrations of Pd(NO3)2, reaction temperatures and times. The results suggest that a small scale increase of the loadings of Pd supported on RGO can significantly improve the catalytic activity of Pd/RGO, and the stability is much better than that of commercial Pd/C catalysts for methanol electrooxidation and the Suzuki reaction.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 42
·19846-19853
·
IF 7.233
Bin Qi,Xin Li,Liang Sun,Bo Chen,Hao Chen,Chenchen Wu,Haibo Zhang,Xiaohai Zhou
Supramolecular nano-assemblies with tunable morphology have attracted extensive attention in composite material manufacturing and many other fields. Herein, a new class of shape-controlled dodecaborate-based supramolecular organic frameworks (BOFs), decorated with diverse ultrafine noble metal clusters (Au, Pd, Pt, Ag), has been successfully fabricated via the tunable host–guest assembly of cucurbit[n = 5,6,7,8]uril and Cs2[closo-B12H12]. Due to the unique dodecaborate-cucurbit[n]uril chaotropic effect, a breakthrough has been made in modulating the supramolecular frameworks in the urchin-like, network-like or octahedron-like structures without tedious chemical modifications or additional additives. More interestingly, Cs2[closo-B12H12], a prominent component in supramolecular structures, can also play dual roles as an excellent reductant and capping agent for the formation of metal clusters. The final product, i.e., BOFs decorated with ultrafine metal clusters (metal/BOFs) can be precipitated from aqueous solutions rapidly and they show high catalytic activity and recyclability in Suzuki reactions and in the selective reduction of furfural (FAL) to furfuryl alcohol (FOL).
研究领域:
材料科学
·
化学工程
·
纳米技术
·
催化
✓ 已验证
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 6
·3243-3256
·
IF 1.843
Zhou Lin,Wang Ruo-Bing
Nitrogen doped mesoporous carbon (N-MPC)-supported monometallic and bimetallic catalysts were synthesized by using hydrothermal and impregnation method, and the catalytic activity of the catalyst to carbon–carbon bond-forming reactions (Suzuki, Heck and Sonogashira reactions) was studied. The bimetallic catalyst Pd-Ni@N-MPC with high Ni to Pd atomic ratios showed highly activity in the C–C coupling reactions of aryl halide under optimized condition. In contrast to their monometallic counterparts, such Pd-Ni@N-MPC catalyst not only show higher catalytic activity but also show more economic and stable. The catalysts were characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope and transmission electron microscopy, which demonstrated that the Pd–Ni NPs highly dispersed and possessed uniform size.
Graphical abstract
研究领域:
催化化学
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材料科学
·
有机化学
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纳米技术
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物理化学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Jinshui Lu,Jinyuan Zhang,Heng Liu,Weipeng Chen,Jiangrong Luo,Ziqing Wang,Tingting Cui,Yonggang Min,Yidong Liu
In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)\pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.
研究领域:
材料科学
·
高分子化学
·
热分析
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Zhongmin Geng,Qianqian Song,Xiaoming Zhang,Bing Yu,Youqing Shen,Hailin Cong
A method of introducing trifluoromethyl group (-CF 3 ) to the polymer backbone by Suzuki reaction was developed to prepare fluorinated polymers for gas separation. The CO 2 permeability increased 119% after the -CF 3 group was substituted. Tungsten disulfide (WS 2 ), a graphene-like two-dimensional material, was used for first time as an inorganic filler to prepare composite MMMs to separate CO 2 , N 2 and CH 4 . The introduction of WS 2 nanosheets increases more transport channels for gas molecules, which lead to the permeability and selectivity of MMMs obviously improved in comparison with the pristine FPPO membrane. The CO 2 /N 2 selectivity and CO 2 /CH 4 selectivity of 10 wt% WS 2 -FPPO MMMs reached a maximum about 29.6 and 39.4, respectively, with a CO 2 permeability of 472 Barrer at 10 psig and 291 K. The best performance of MMMs for CO 2 /N 2 and CO 2 /CH 4 surpasses the Robeson's upper bound line. The MMMs showed strong stability in long-term observation. The results indicated a new direction for CO 2 separation by introducing -CF 3 group to polymer and using 2D WS 2 nanosheets as nanofiller.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）