JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xuyu Wang,Jing Li,Jiajun Xing,Manyu Zhang,Rui Liao,Chongtai Wang,Yingjie Hua,Hongbing Ji
The elimination of formaldehyde at room temperature holds immense potential for various applications, and the incorporation of a catalyst rich in surface hydroxyl groups and oxygen significantly enhances its catalytic activity towards formaldehyde oxidation . By employing a coprecipitation method, we successfully achieved a palladium domain confined within the manganese carbonate lattice and doped with iron. This synergistic effect between highly dispersed palladium and iron greatly amplifies the concentration of surface hydroxyl groups and oxygen on the catalyst, thereby enabling complete oxidation of formaldehyde at ambient conditions. The proposed method facilitates the formation of domain-limited palladium within the MnCO 3 lattice, thereby enhancing the dispersion of palladium and facilitating its partial incorporation into the MnCO 3 lattice. Consequently, this approach promotes increased exposure of active sites and enhances the catalyst's capacity for oxygen activation. The co-doping of iron effectively splits the doping sites of palladium to further enhance its dispersion, while simultaneously modifying the electronic modification of the catalyst to alter formaldehyde's adsorption strength on it. Manganese carbonate exhibits superior adsorption capability for activated surface hydroxyl groups due to the presence of carbonate. In situ infrared testing revealed that dioxymethylene and formate are primary products resulting from catalytic oxidation of formaldehyde, with catalyst surface oxygen and hydroxyl groups playing a crucial role in intermediate product decomposition and oxidation. This study provides novel insights for designing palladium-based catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 24
·4147-4153
·
IF 3.117
Ming-Yu Dou,Dan-Dan Zhong,Xian-Qiang Huang,Guo-Yu Yang
Polyoxometalate (POM) cluster organic frameworks (POMCOFs) are an emerging class of catalytic materials, providing an opportunity to develop fascinating catalysts with well-defined, tunable, active sites for a range of chemical transformations. Although remarkable progress on numerous POMCOF materials has been reported, the synthesis of polyoxovanadate (POV) cluster organic frameworks (POVCOFs) has seldom been reported. Thus, the exploration of novel POVCOFs still attracts considerable research interest. Additionally, Knoevenagel condensation as a versatile tool for the construction of CC bonds still continues to be a challenge at room-temperature and under solvent-free conditions. Herein, three POV-based clusters, [Ni(1-bIm)4]2(V4O12)·H2O (1), [Ni(1-eIm)(H2O)4]2(V10O28)(1-eImH)2·2H2O (2) and [Ni(H2O)5]2(V10O28)(1-pImH)2·4H2O (3) (1-bIm = 1-butylimidazole; 1-eIm = 1-ethylimidazole and 1-pIm = 1-propylimidazole), have been made. 1 was controllably achieved by an imidazole-induced self-assembly strategy and exhibited a 2D POVCOF in which circular [V4O12]4− clusters are bridged by four six-coordinated Ni(II) atoms (NiN4O2 model). 2 and 3 are obtained at lower pH values. Notably, among the three POV-based clusters, POVCOF 1 displays highly efficient heterogeneous solvent-free catalytic activity (yields of up to 99%) and excellent recyclability in Knoevenagel condensation at room temperature.
研究领域:
材料化学
·
催化化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 3
·1800533
·
IF 3.175
Shiliang Zhang,Qilu Yao,Qingyang Li,Gang Feng,Zhang-Hui Lu
The synthesis of noble-metal-free recyclable catalysts with prominent catalytic performance for the complete hydrogen production from hydrazine borane (N 2 H 4 BH 3 , HB) is of great significance in achieving a hydrogen economy-based society. Herein, Raney Ni is synthesized using a rapidly quenched aluminum–nickel alloy under a typical alkali leaching condition and is used to catalytically convert hydrogen of N 2 H 4 BH 3 to H 2 via hydrolyzing BH 3 groups and decomposing the N 2 H 4 moiety in alkaline conditions. It is the first report of a noble-metal-free catalyst achieving a complete production of hydrogen from N 2 H 4 BH 3 at room temperature. This noble-metal-free catalyst might tremendously broaden the actual utilization of HB as a promising chemical hydrogen storage material. In addition, such a simple strategy can also be expanded to design and synthesize other porous metals for more applications.
研究领域:
能源化学
·
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenqian Yan,Kunmeng Zhu,Yi Cui,Yanhan Li,Tao Dai,Sheng Cui,Xiaodong Shen
A new material of Ag-SnO 2 /rGO aerogel is fabricated by the sol-gel method and freeze-drying technique. The SnO 2 particles are tightly arranged on the rGO sheets to form a p-n heterojunction , and the rGO aerogel possesses abundant pore structures for effective adsorption. Besides, the Ag particles are dispersed on the surface as a catalyst to improve the internal electron mobility, further promoting the gas-sensing performance. To be noted, the Ag-SnO 2 /rGO aerogel can exhibit a response of 2.13 towards 50 ppm NO 2 at RT instead of heating conditions, and shows a cyclic capacitance property of redox. Moreover, the non-linear growth between gas concentration and response is observed, which proves the chemical adsorption that results in the high selectivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 41
·16164-16168
·
IF 3.069
Shangqing Chen,Zheng Wang,Jiayin Hu,Yafei Guo,Tianlong Deng
The readily available ZnI2/NEt3 system was used firstly to catalyze the transformation of CO2 and 2-aminobenzonitriles into quinazoline-2,4(1H,3H)-diones at room temperature and low CO2 pressure in high yields. Further experiments indicated that this ZnI2/NEt3 system has excellent effects on activating both amino and cyano groups.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Chunying Fan,Bobo Wang,Tianle Wu,Qinchun Kang,Huishuang Wang,Jiajia Sun,Xiaofeng Wei
Nickel-catalyzed radical relayed dicarbofunctionalizations of olefins, utilizing carbon electrophiles as coupling partners, present a powerful strategy for the streamlined construction of aliphatic structures. However, traditional solution-phase methods encounter challenges such as the need for bulk solvents, limited coupling partners, long reaction times, and air-/moisture-sensitive reagents. As an alternative strategy, ball-mill-enabled metal-catalyzed cross-coupling reactions have gained attention due to their high reactivity and atomic efficiency. While many ball-mill-enabled cross-coupling reactions are limited to single- and two-component methodologies, three-component solid-state cross-coupling reactions remain relatively scarce. In this work, we report the first, to our knowledge, ball-milling-enabled Ni-catalyzed reductive dicarbofunctionalization of alkenes. Two distinct readily available electrophiles, Csp 2 and Csp 3 halides, are simultaneously installed across a variety of olefins at room temperature in a highly regioselective manner withing 1.5 h. By harnessing the benefits of ball milling and radical relayed reactions, we anticipate further advancements in sustainable and efficient synthetic methodologies.
研究领域:
有机化学
·
绿色合成
·
金属催化
·
自由基化学
·
机械化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 20
·10383-10389
·
IF 9.3
Haibo Zhu,Ting Zhong,Liu Yang,Yajing Shen,Qiangwen Fan,Zhanggao Le,Zongbo Xie
The photocatalytic activation of oxygen molecules (O2) is an environmentally friendly and sustainable alternative to substituted benzofuran-3(2H)-one synthesis. Herein, lead-free Cs2AgBiBr6 nanocrystals were used to activate O2 efficiently and selectively for the photocatalytic transformation of 4-hydroxycoumarins to functional 2-hydroxy-benzofuran-3(2H)-ones under an air atmosphere. Polyfunctionalized benzofuran-3(2H)-ones with a quaternary carbon center can be selectively obtained in moderate to good yields at room temperature via one-pot synthesis. Perovskite crystal structures have significant influence on photocatalytic activity due to the different charge separation abilities. The reaction mechanism was further investigated to confirm the contribution of reactive oxygen species (ROS).
研究领域:
材料化学
·
有机合成
·
光催化
·
绿色化学
·
纳米材料
·
环境科学
·
可持续化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）