CATALYSIS COMMUNICATIONS
·
2015
·
IF 3.699
Kun Liu,Zhaoxiang Chen,Peipei Zou,Yuanyuan Wang,Liyi Dai
The oxidation of alcohols to carbonyl compounds in gas-phase is of great importance in organic chemistry and industrial process. Herein, the catalyst CuPd–Cu 2 O/Ti-powder is prepared by depositing Cu(NO 3 ) 2 and Pd(NO 3 ) 2 on Ti powder support followed by in-situ activation in reaction stream, which delivers high-performance for the gas-phase oxidation of alcohols. Compared with Cu/Ti-powder and Pd/Ti-powder, CuPd–Cu 2 O/Ti-powder exhibits higher stability and activity in alcohol oxidation reaction. The catalyst is characterized by XRD, XPS, TEM and ICP. The results indicate that CuPd(alloy)–Cu 2 O formed during the reaction contributes to the high activity and stability.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 4
·814-818
·
IF 1.3
Wang Peng,Zhang Binbin,Liu Xiaofei,Zhang Xin,Tu Rong,Zhang Song,Li Baowen
It remains a big challenge to synthesize two-dimensional (2D) GaN material for applications in power nanodevices. Traditional synthetic methods require complex equipment and processes and time consuming. Here, we reported a two-step route to prepare polycrystalline 2D GaN film. The amorphous ultrathin Ga 2 O 3 film was first exfoliated from the surface of liquid gallium. In a vapor phase reaction, 2D Ga 2 O 3 film was then converted into 2D GaN film while maintaining the 2D morphology. Raman and high-resolution transmission electron microscope (HRTEM) analysis implies the successful synthesis of wurtzite-type GaN ultrathin film. This simple strategy proposed in this work will provide more opportunities for applications of GaN ultrathin film in many devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2022
·
IF 5.755
Jixing Liu,Shuping Zhu,Teng Guo,Bin Jia,Li Xu,Jun Chen,Ping Cheng
Naphthalene (Nap), one of the most abundant PAHs in the atmosphere, has been shown to be an important secondary organic aerosol (SOA) precursor. In this study, the gas- and particle-phases (Suspended Nap-coated polystyrene latex spheres (PSLs) generated by vaporization condensation) Nap ozonolysis were investigated in a 1000 L volume cubic Teflon smog chamber. Gas-phase products and Nap-SOAs were observed from the gas- and particle-phase Nap ozonolysis via homogeneous and heterogeneous reactions, respectively. The time-dependent size distribution and mass concentration of Nap-SOAs were analyzed using a scanning mobility particle sizer and a laboratory-developed single-particle aerosol mass spectrometry (SPAMS) instrument. The chemical components of the homogeneous and heterogeneous reaction products were analyzed on-line by single photo ionization mass spectrometry (SPIMS), SPAMS, as well as by thermal desorption gas chromatograph-mass spectrometry. The results showed that the chemical components of the gas-and particle-phase Nap ozonolysis were essentially the same, with the dominant products being phthalaldehyde, phthalic anhydride, 2-carboxybenzaldehyde, and benzoic acid ; Nap-SOA formation was attributed to the formation of new particles as well as the uptake of homogeneous and heterogeneous Nap oxidation products on the gas-phase or/and the particle surface. Based on the online measurement results, the reaction mechanism of Nap-ozonolysis also exhibits an initial carbon atom or double-bond attacks by O 3 , and kinetic analysis of Nap-coated PSLs ozonolysis shows a heterogeneous reaction rate constant of 2.55E-4 s −1 with R 2 = 0.984. This study provides a systematic approach to characterize the chemical and physical properties of the gas- and particle-phase Nap ozonolysis in real time, which will deepen our understanding of the migration and transformation of PAHs in the atmosphere.
研究领域:
大气化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lin Ai,Hui Ding,Yutong Jiao,Zeling Zhou,Xiao-Feng Wu,Peidong Li,Shengjun Huang
In the field of heterogeneous catalysis, the selective hydrogenation of α,β-unsaturated aldehyde to α,β-unsaturated alcohol is a prominent focus in the synthesis of fine chemicals. Herein, we present a straightforward protocol for constructing hierarchical zeolite supported catalysts for the gas-phase selective hydrogenation of α-methylacrolein to methallyl alcohol. Compared to the original microporous zeolite, the incorporation of mesoporous channels within the hierarchical zeolite gives rise to ample space to embed Ag nanoparticles, thereby delivering a positive effect on enhancing accessibility to metal active sites and leading to increased reactivity. Moreover, unlike the typical transition metals (Pt, Ni, Cu and Co), the unique surface properties of metal Ag inherently plays a crucial role in the formation of a desirable adsorption configuration. The resulting vertical orientation (on-top η1-σ(O) mode) causes the carbonyl group to interact with the Ag active sites via the terminal oxygen atom, while the C=C bond tilts away from the metal surface. Specifically, the selectivity to the targeting methallyl alcohol reaches ~75% over the hierarchical ZSM-5 and Silicalite-1 supported Ag catalysts under optimal reaction conditions. This discovery highlights the significance of pore architecture and adsorption configuration on the catalytic performance, and aims to deepen understanding for the rational design of heterogeneous catalysts in the gas-phase selective hydrogenation of α,β-unsaturated aldehydes.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Pengze Zhang,Yangzhen Jin,Zhaobin Jiang,Guanqun Xie,Qunfeng Zhang,Xiaonian Li
Developing of non-metallic catalyst to replace metal catalyst is a meaningful and challenging direction. In this work, the non-metallic catalyst was synthetized successfully by loading ionic liquid onto the silica surface, which was applied for the gas-phase dehydrochlorination of 1, 1, 2, 2-tetrachloroethane. The 12%TPPC/SiO 2 (wt%) showed the best results with the conversion of 1, 1, 2, 2-tetrachloroethane reaching 100%. The selectivity of 1, 1, 2-trichloroethylene was 100%, and no deactivation was found during the evaluation period. The catalytic mechanism was investigated and possible reaction route was given, which was a reference for fabricating and design of solid base catalyst.
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Zhang Hao,Tao Mian,Gao Baizhi,Chen Wei,Li Qi,Xu Qingyu,Dong Shuai
The fabrication of high-quality organic-inorganic hybrid halide perovskite layers is the key prerequisite for the realization of high efficient photon energy harvest and electric energy conversion in their related solar cells. In this article, we report a novel fabrication technique of CH 3 NH 3 PbI 3 layers based on high temperature chemical vapor reaction. CH 3 NH 3 PbI 3 layers have been prepared by the reaction of PbI 2 films which were deposited by pulsed laser deposition, with CH 3 NH 3 I vapor at various temperatures from 160 °C to 210 °C. X-ray diffraction patterns confirm the formation of pure phase, and photoluminescence spectra show the strong peak at around 760 nm. Scanning electron microscopy images confirm the significantly increased average grain size from nearly 1 μm at low reaction temperature of 160 °C to more than 10 μm at high reaction temperature of 200 °C. The solar cells were fabricated, and short-circuit current density of 15.75 mA/cm 2 , open-circuit voltage of 0.49 V and fill factor of 71.66% have been obtained.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Dong HUANG,Ming-yu ZHANG,Qi-zhong HUANG,Li-ping WANG,Xian TANG,Xin YANG,Kai TONG
A novel SiC–ZrB 2 coating was prepared using a two-step technique by slurry-sintering and chemical vapor reaction on carbon/carbon (C/C) composites. The SiC–ZrB 2 coating was composed of the scattered ZrB 2 phase and the continuous SiC phase. It was observed that a good adhesion was built between the coating and the C/C composites. The SiC–ZrB 2 coating samples exhibited a better ablation resistance in comparison with the uncoated C/C composites. The SiO 2 –ZrO 2 barrier layer, the heat dissipation of the gaseous products and the pinning effect of ZrO 2 all contributed to the good ablation resistance of the SiC–ZrB 2 coated composites.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2025
·
IF 5.3
Yupeng Tian,Yujia Liu,Shoutao Ma,Wei Xu,Chenyang Zhao,Bing Sun
This study introduces a heart-like micromixer reactor and Au/TS-1 catalyst to address the dual challenges of safety and efficiency in gas-phase propylene epoxidation using H 2 and O 2 . Conventional methods face inherent explosion risks and rapid catalyst deactivation due to sintering and coking. The microreactor architecture achieves over 99% flame-quenching efficiency via sub-millisecond radical suppression and enhanced heat transfer, enabling safe operation with minimal inert gas dilution (N 2 < 70 vol%). Coupled with alkali-promoted Au/TS-1 catalysts, the system sustains > 90 % propylene oxide (PO) selectivity for 500 h, outperforming static mixers where activity halved within 100 h. This work pioneers a reactor-catalyst co-design strategy, decoupling safety constraints from reaction efficiency, and establishes a scalable platform for sustainable PO synthesis. Besides, the critical gaps in industrial-scale implementation of explosive gas-phase reactions is bridged.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED COMPOSITE MATERIALS
·
2020
·Vol. 27
·期 3
·131-148
·
IF 2.199
Cuiyan Li,Zhao Xu,Haibo Ouyang,Liyuan Chang,Jianfeng Huang,Yijun Liu
Porous C/SiC ceramics were prepared by chemical vapor reaction of SiO and porous C/C composites. The porous C/SiC ceramics presented a hierarchical structured consisted of carbon fibers, SiC layer, microspheres and nanowires. The density of porous C/C composites control the growth of SiC nanowires and nanolayer, and influence the pore size distribution and specific surface area of the porous C/SiC ceramics. The C/SiC samples converting from the C/C composites with a density of 0.46 g/cm 3 possess the superior adsorption properties. The adsorption efficiency can reach 98.2% within 80 min, indicating that C/SiC samples have a promising adsorption property for MB from aqueous solution. Furthermore, the adsorption efficiency after five cycles microwave regeneration still reached 80.2%, which present excellent regeneration stability.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Ge-liang Xie,Yang Cao,Sheng-ren Li,Qian-qian Lu,Wei Chen,Shuai Gao,Wei Qiu,Chao He,Zhen Fang,Lujiang Xu
Lignin valorization through catalytic upgrading to nitrogen-containing aromatics represents a critical pathway for sustainable chemical production. Using vanillin, a key lignin depolymerization product, as a platform molecule, we demonstrate the first integrated strategy combining cyanide-free cyanation and gas-phase hydrodeoxygenation (HDO) to synthesize hydroxybenzonitriles (HBNs). Bond dissociation energy (BDE) analysis revealed the cyano group’s selective retention (C≡N: 136.21 kcal/mol vs C–O: 62.44–116.17 kcal/mol), guiding targeted HDO pathway design. A green H2O/HCOOH system achieved 99.2 mol % vanillonitrile yield under mild conditions (85 °C, 12 h), surpassing conventional DMF-based methods. Engineered Mo/TiO2 catalysts with triple functional sites (oxygen vacancies, suitable content of Mo5+, strong metal–support interaction) achieved 57.6% HBN yield in continuous gas-phase HDO, outperforming Mo/ZrO2. The catalyst retained 90% of its initial activity over eight cycles due to enhanced metal–support interactions. This work establishes a sustainable route for lignin-to-chemical conversion, advancing catalyst design principles for biomass upgrading.
研究领域:
催化
·
绿色化学
·
生物质转化
·
有机合成
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Hu Yaqi,Liu Runze,Lu Kaiyun,Wu Daoning,Gao Pan,Hou Guangjin,Zhang Hongbo,Dai Weili
Hydrated hydronium ions formed in the pores/cages of zeolite catalysts are suggested as the active species that could impact the adsorption of reactant, the stability of intermediates or transition states, and the reaction mechanism in the aqueous phase alcohol dehydration. Nevertheless, under a typical vapor phase reaction condition, the relevant situation is still debatable. Herein, the promotion of water on cyclohexanol (CyOH) adsorption and dehydration under a vapor phase condition was clarified by in situ 1 H MAS NMR, 2D 1 H DQ MAS NMR and 2D 1 H- 27 Al HMQC NMR spectroscopy, systematic kinetic studies, isotope tracing and thermodynamic measurements. The water promoting effects were ascribed to water facilitating the formation of H 3 O + cluster (H 3 O + (H 2 O) n-1 ), and per Brønsted acid site (BAS) could be saturated by about 5 water at ambient temperature. The CyOH dehydration pathway was found to be highly dependent on the water concentrations, and a dimer reaction route with the C-H bond rupture as the kinetically relevant step (KRS) was verified as the main reaction pathway at high water concentrations. All these findings provide the deep insights into how water regulating the zeolite catalyzed dehydration reaction at a molecular level.
研究领域:
催化化学
·
物理化学
·
材料科学
·
核磁共振波谱学
·
反应机理
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 7
·694
·
IF 4
Ziyan Mi,Huayun Long,Yuhua Jia,Yue Ma,Cuilan Miao,Yan Xie,Xiaomei Zhu,Jiahui Huang
The development of non-noble metal catalysts for gas-phase propylene epoxidation with H2/O2remains challenging due to their inadequate activity and stability. Herein, we report a Cs+-modified Ni/TS-1 catalyst (9%Ni-Cs/TS-1), which exhibits unprecedented catalytic performance, giving a state-of-the-art PO formation rate of 382.9 gPO·kgcat−1·h−1with 87.8% selectivity at 200 °C. The catalyst stability was sustainable for 150 h, far surpassing reported Ni-based catalysts. Ni/TS-1 exhibited low catalytic activity. However, the Cs modification significantly enhanced the performance of Ni/TS-1. Furthermore, the intrinsic reason for the enhanced performance was elucidated by multiple techniques such as XPS, N2physisorption, TEM,29Si NMR, NH3-TPD-MS, UV–vis, and so on. The findings indicated that the incorporation of Cs+markedly boosted the reduction of Ni, enhanced Ni0formation, strengthened Ni-Ti interactions, reduced acid sites to inhibit PO isomerization, improved the dispersion of Ni nanoparticles, reduced particle size, and improved the hydrophobicity of Ni/TS-1 to facilitate propylene adsorption/PO desorption. The 9%Ni-Cs/TS-1 catalyst demonstrated exceptional performance characterized by a low cost, high activity, and long-term stability, offering a viable alternative to Au-based systems.
研究领域:
催化化学
·
化学工程
·
材料科学
·
多相催化
·
绿色化学
✓ 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）