Polymers
·
2023
·Vol. 15
·期 10
·2359
·
IF 5
Xiaohua Gu,Xiaoyao Wang,Xinyu Guo,Siwen Liu,Chunhua Lou,Yan Liu
In this paper, the high-efficiency degradation and alcoholysis recovery of waste polyurethane foam were realized using a combination of a high-efficiency alkali metal catalyst (CsOH) and two-component mixed alcoholysis agents (glycerol and butanediol) in different proportions, using recycled polyether polyol and one-step foaming to prepare regenerated thermosetting polyurethane hard foam. The foaming agent and catalyst were adjusted experimentally to prepare regenerated polyurethane foam, and a series of tests were conducted on the viscosity, GPC, hydroxyl value, infrared spectrum, foaming time, apparent density, compressive strength, and other properties of the degradation products of the regenerated thermosetting polyurethane rigid foam. The resulting data were analyzed, and the following conclusions were drawn: The optimal conditions of alcoholysis were obtained when the mass ratio of glycerol to butanediol was 3:2, the amount of cesium hydroxide was 0.08%, the reaction temperature was 170 °C, and the reaction time was 2.5 h. Regenerated polyurethane foam with an apparent density of 34.1 kg/m3and a compressive strength of 0.301 MPa was prepared under these conditions. It had good thermal stability, complete sample pores, and a strong skeleton. At this time, these are the best reaction conditions for the alcoholysis of waste polyurethane foam, and the regenerated polyurethane foam meets various national standards.Keywords:polyurethane foam;high-efficiency catalyst;recycling;glycolysis
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Jie Feng,Li Su,Yanhua Ma,Cuiling Ren,Qing Guo,Xingguo Chen
In this paper, we discovered that CuFe 2 O 4 magnetic nanoparticles (MNPs) possessed high catalytic performance in the reduction of nitrophenol for the first time. The as-prepared CuFe 2 O 4 MNPs exhibited several advantages such as stability, monodispersity, low-cost, simplicity and rapid separation performance over other catalysts for the reduction of nitrophenol. The CuFe 2 O 4 MNPs showed high efficiency in the catalytic reduction of 4-nitrophenol to 4-aminophenol with the conversion of 95% within 40 s in the presence of NaBH 4 . The pseudo-first-order kinetic equation could describe the reduction of 4-nitrophenol with the excess amount of NaBH 4 .
研究领域:
材料科学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 124
·102210-102218
·
IF 3.84
Wanchun Guo,Jiao Jiao,Kesong Tian,Yongfu Tang,Yin Jia,Ruifei Li,Zhaopeng Xu,Haiyan Wang
A soft template-assisted simultaneous redox strategy has been developed to fabricate Fe3O4@polypyrrole/Pd (Fe3O4@PPy/Pd) nanocomposites with a single Fe3O4 core and multiple PPy satellites, into each of which multiple tiny Pd nanocrystals are uniformly confined. The dispersion of Pd nanocrystals into PPy satellites and the Pd loading of the nanocatalyst could be finely tuned by tailoring the polarity of the reaction medium and by changing the molar ratio of pyrrole monomer to Pd precursor, respectively. The Pd-based catalyst shows high activity, robust stability and magnetic recyclability for the reduction of nitroaromatic compounds. Superior activity could be attributed to the short transport route toward the active Pd nanocrystals within the small PPy satellite for the outer substitutes. Meanwhile, high stability could be ascribed to the confinement of Pd nanocrystals uniformly into PPy satellites against aggregation and even loss of active sites during catalytic transformations.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 4
·596-602
·
IF 0.7
Yi Hongliang,Fan Xianzhen,Long Guoqiang,Lan Gaoli,Liang Zihao,Ge Xingbo
Abstract Co-based derivatives have been proved as high-active electrochemical water splitting catalysts. In this study, a highly efficient CoMoCu catalyst for hydrogen evolution reaction (HER) was prepared by doping trace Mo and Cu into Co through a simple one-step electrodeposition method. The structural and chemical modification toward CoMoCu led by Cu doping was studied, and a series of characterization methods were utilized to reveal its mechanism. Compared with bimetallic CoMo and CoCu, the CoMoCu exhibits outstanding activity for the HER in 0.5 M H 2 SO 4 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Renjie Deng,Kuiyi You,Lei Yi,Fangfang Zhao,Jian Jian,Zhenpan Chen,Pingle Liu,Qiuhong Ai,He’an Luo
A mild and highly efficient method for solvent-free low temperature catalytic nitration of toluene with NO2 promoted by molecular oxygen has been developed in the present work. The immobilized AlCl3–SiO2 catalyst was successfully synthesized by a chemical bonding method. The results indicated that the synergistic catalysis of molecular oxygen and catalyst remarkably improved the nitration efficiency. Under optimal conditions, 86.5% of toluene conversion with 100% of selectivity to mononitrotoluene was achieved at 35 °C. Furthermore, the immobilized 10% AlCl3–SiO2 catalyst exhibited excellent stability in this nitration process. Finally, the probable reaction mechanism for the catalytic nitration promoted by molecular oxygen over AlCl3–SiO2 was suggested. This work affords a simple, highly efficient, safe, and benign approach for the preparation of valuable mononitrotoluene under the mild conditions and has potential industrial application prospects.
研究领域:
化学工程
·
催化
·
有机化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Xiaolong Fang,Tingting Luo,Gang-Gang Chang,Li Mei,Ziwen Li,Yao Yao,Chao Liu,Didi Dong,Xiao-Yu Yang
Metal-organic frameworks (MOFs) have garnered extensive research interest due to their ultrahigh porosity and flexible tunability. However, the predominantly microporous structures of most reported MOFs impose substantial mass transfer resistance and restrict the exposure of active sites, while their powdered form poses a major bottleneck for industrialization. In this work, hierarchical ultrasmall MOF aerogels with micro/mesoporous structures and high specific surface area, HP-UiO-66-NH2-X@WCA are successfully synthesized via an in-situ construction strategy driven by H2O/Ace competitive nucleation. Notably, the fabricated HP-UiO-66-NH2-X@WCA under this solvent-regulated environment effectively exposes more active sites and promotes the rapid diffusion of large molecules due to its ultrasmall nanoparticles (< 25 nm) and tunable interconnected mesopores (3.7 - 21.3 nm). Moreover, HP-UiO-66-NH2-X@WCA exhibits excellent structural stability and elasticity, imparting exceptional durability and convenient recyclability in practical applications. Benefiting from above advantages, HP-UiO-66-NH2-X@WCA demonstrates superior macromolecular selective adsorption and efficient catalytic activity compared to microporous MOF aerogels with larger particle sizes. Furthermore, when HP-UiO-66-NH2-X@WCA is packed into a fixed-bed reactor for continuous-flow catalysis, it exhibits excellent activity and stability over long-term operation. This work offers new insights into the controlled design and fabrication of high-performance hierarchical MOF aerogels for practical adsorption and catalytic applications.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
催化
·
吸附
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2017
·Vol. 60
·期 11
·1121-1128
·
IF 3.956
Yang Hongchao,Wang Changhong,Hu Feng,Zhang Yejun,Lu Huan,Wang Qiangbin
The synthesis of atomic-scale metal catalysts is a promising but very challenging project. In this work, we successfully fabricated a hybrid catalyst of Ptc/Ni(OH) 2 with atomic-scale Pt clusters uniformly decorated on porous Ni(OH) 2 nanowires (NWs) via a facile room-temperature synthesis strategy. The as-obtained Pt c /Ni(OH) 2 catalyst exhibits highly efficient hydrogen evolution reaction (HER) performance under basic conditions. In 0.1 mol L −1 KOH, the Pt c /Ni(OH) 2 has an onset overpotential of ~0 mV vs. RHE, and a significantly low overpotential of 32 mV at a current density of 10 mA cm −2 , lower than that of the commercial 20% Pt/C (58 mV). The mass current density data illustrated that the Pt c /Ni(OH) 2 reached a high current density of 6.34 Amg
−1 Pt
at an overpotential of 50 mV, which was approximately 28 times higher than that of the commercial Pt/C (0.223 A mg
−1 Pt
) at the same overpotential, proving the high-efficiency electrocatalytic activity of the as-obtained Pt c /Ni(OH) 2 for HER under alkaline conditions.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
物理化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hengxi He,Weirui Chen,Jiaxin Zhou,Xukai Li,Jing Wang,Laisheng Li
The sluggish Me (n+m)+ / Me n+ redox cycle greatly restrained the catalytic ozonation performance of metal-based catalysts. To break this bottleneck, we adopted an interfacial oxidation reaction to create electron-deficient/rich centers within carbon skeleton derived from MOF (C-MOF) by utilizing the electronegativity difference between cerium (Ce) and manganese (Mn), and evaluated its catalytic ozonation activity with ibuprofen (IBP) as model pollutant. XPS, H 2 -TPR, LSV and EPR characterizations as well as DFT calculation demonstrated that there existed electron-deficient Ce sites and electron-rich Mn sites on CeO x /MnO x /C-MOF. Under the co-function of Ce and Mn sites, CeO x /MnO x /C-MOF/O 3 process achieved 100% IBP removal in 90 min, which was 3.1 times of sole ozonation process. IBP could be absorbed at the electron-deficient Ce center and directionally donate its electron to the O 3 around electron-rich Mn center. Singlet oxygen ( 1 O 2 ) played the major role in IBP degradation. Cl − , HCO 3 − , NO 3 − and SO 4 2− demonstrated limited inhibitions on IBP degradation. This work provided a sustainable strategy for breaking the rate-limiting step in the traditional catalytic ozonation.
研究领域:
环境科学
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Caihong Liu,Xihui Jiang,Zhiqiang Sun,Rui Gao,Min Wang,Qiang He,Jun Ma
Catalytic membranes that enable simultaneous micropollutant degradation during oil/water separation have emerged as a promising candidate for treating complex emulsified oily wastewater. However, this hybrid system suffers from membrane fouling and subsequent radical quenching. Herein, we overcome these challenges by developing a novel hierarchical filtration-catalysis ceramic membrane to achieve efficient gradient decontamination. This membrane comprises a top hydrophilic MWCNT layer deposited on a CuFe2O4-immobilized ceramic membrane to construct CCuFeCM. A pristine ceramic membrane (CM) and a CuFe2O4-immobilized membrane (CuFeCM) served as controls. Our results demonstrated that CCuFeCM presents the most alleviated fouling potential (∼18% of flux decline) and TOC removal (91%) when treating synthetic textile wastewater containing a mineral oil-in-water emulsion with RhB. Besides that, CCuFeCM achieves the highest PMS-based RhB degradation capability (100%) and initial reaction rate (0.684 min–1). Quenching experiments and EPR analyses show that SO4–•, •OH, and 1O2 are responsible for the CCuFeCM/PMS oxidation system, and 1O2 is the dominant reactive species. The synergistic effect of oil separation and catalytic decomposition is mainly ascribed to the ordered arrangement of selective separation in advance to avoid interference with subsequent AOPs, which allows for micropollutants that are transmitted into internal membrane channels for confined catalytic oxidation. Furthermore, replication filtration tests indicate that CCuFeCM shows durable stable degradation and antifouling performance after simple cleaning. The specific functionality of oil isolation, catalyst anchor, and mass transfer effect reaction compartmentation provides a novel strategy for efficient gradient removal of multiple pollutants in water, which highlights promising application potential under realistic conditions.
研究领域:
环境工程
·
废水处理
·
催化
·
膜技术
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ziqiang Wang,Min Li,Peng Wang,Kai Deng,Hongjie Yu,Xin Wang,You Xu,Hongjing Wang,Liang Wang
Electrocatalytic nitrogen reduction to ammonia has attracted abundant research interest due to its mild operation condition and sustainable feedstock. The identification of efficient catalysts with high selectivity of nitrogen reduction is the key for the electro-synthesis of ammonia. Herein, interstitial boron-doped nanoporous palladium film is directly formed on Ni foam (nPdB/NF) via micelle-assisted reduction method using borane dimethylamine complex as reducing agents and boron dopant. The binder-free nanoporous structure provides abundant active sites and facilitated mass/charge transfer. Moreover, the introduction of interstitial boron atoms can modify the electronic structure of Pd, which can both improve the nitrogen adsorption and inhibit hydrogen evolution on nPdB/NF. As such, nPdB/NF exhibits high NH 3 yield of 29.0 μg h −1 mg −1 cat. and Faraday efficiency of 17.9% in 0.1 M Na 2 SO 4 , superior to that of nPd/NF (19.7 μg h −1 mg −1 cat and 14.7%). This work offers an attractive method for the introduction of interstitial boron into Pd-based catalysts to improve NRR performance.
研究领域:
电化学
·
催化
·
材料科学
·
可持续化学
✓ 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）