CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Yan-Wen Ye,Yi-Ming Hu,Wan-Bin Zheng,Ai-Ping Jia,Yu Wang,Ji-Qing Lu
ABSTRACT Ir nanoparticles (NPs) were synthesized via a colloidal method using tetradecyltrimethyl ammonium bromide (TTAB) as the ligand, and the supported Ir/BN catalysts were employed for selective hydrogenation of crotonaldehyde (CRAL). It was found that by proper thermal treatments, the TTAB-capped Ir NPs were very active and selective for the reaction. The Ir/BN catalyst calcined at 300 °C with surface TTAB residue gave a quasi-steady state turnover frequency (TOF) for crotyl alcohol (CROL) formation of 0.02 s −1 and a CROL selectivity of 94.4%, while that calcined at 500 °C with clean surface gave a TOF of 0.004 s −1 and a CROL selectivity of 56.2%. The Ir-TTAB interface was essential for the enhanced performance. In-situ IR spectra along with kinetic investigation revealed that TTAB improved CRAL adsorption and strengthened C=O adsorption, which accounted for high activity and selectivity. However, high coverage of TTAB on the Ir surface suppressed the H 2 adsorption and consequently lowered the activity. Thus the findings provided useful information on the design of efficient catalysts for selective hydrogenation.
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
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2025
·
IF 1.8
Lazang Gengga,Zifeng Chu,Bo Meng,Haichao Li
The precursors were formed in a concentrated salt system using the mutual synergy between TTAB (cetyltrimethylammonium bromide) and sodium sulphate at 100 °C, 300 rmp. Carbon nanorods were prepared by in-situ carbonisation of precursors at elevated temperatures. The prepared carbon nanorods were characterised by SEM, Raman, XRD, FT-IR and XPS. SEM results showed that the prepared carbon nanorods had a classical rod-like structure and most of them had lengths between 500 nm and 1.2 μm and diameters around 50 nm. Raman results showed ID/IG=0.839, a low degree of graphitisation and some defects in the structure of carbon nanorods as characterised by XRD. FT-IR and XPS analyses showed a variety of functional groups on the surface of carbon nanorods. Although the structure of the prepared carbon nanorods was not very perfect, it couldn’t be ignored that the method of preparing carbon nanorods using the interaction between Na2SO4 and TTAB was feasible.
研究领域:
材料科学
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纳米技术
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物理化学
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功能材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 41
·21979-21986
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IF 5.968
Meina Wang,Xiangyou Liu,Chuanbao Cao,Long Wang
Monodisperse CuInS2–ZnS nanocrystals were synthesized in organic solvents and effectively transferred to aqueous phase with the aid of trimethyl(tetradecyl)ammonium bromide (TTAB). TTAB-stabilized CuInS2–ZnS (CIS–ZnS–TTAB) nanocomposites exhibited good aqueous stability and preserved the high luminescence of the nanocrystals after phase transfer. More intriguingly, without any further modification, CIS–ZnS–TTAB showed a striking nuclear homing property, preferentially accumulating in the nuclei of living cells. This novel probe CIS–ZnS–TTAB may have applications in nuclear selective imaging and as a multifunctional drug carrier for nuclear targeted drug delivery. Our work provides a simple but effective way for hydrophobic nanomaterials to achieve both phase transfer and nuclear selectivity simultaneously.
研究领域:
材料科学
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生物医学工程
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 6
·3744-3750
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IF 1.483
Yang Guangming,Yu Hongbo,Zhang Jianfeng,Yin Hongfeng,Ma Zhen,Zhou Shenghu
AuPd nanoparticles (NPs) protected by tetradecyl trimethyl ammonium bromide (TTAB) were coated with SiO2 through hydrolysis of tetraethylorthosilicate (TEOS). The as-synthesized AuPd@SiO2 core–shell NPs were calcined in air at 500 °C to remove TTAB and
open up mesopores within the SiO2 shells. The obtained Au–PdO@m-SiO2 NPs were reduced by H2 at 300 °C to obtain AuPd@m-SiO2 NPs with AuPd NP cores (diameter: ~3 nm) and SiO2 shells (thickness: ~18 nm). Results from relevant characterization
indicated that these SiO2-protected core–shell NPs were highly stable during calcination and subsequent reduction. Au@m-SiO2, Au10Pd@m-SiO2, Au5Pd@m-SiO2, AuPd5@m-SiO2, AuPd10@m-SiO2,
and Pd@m-SiO2 NPs with similar core sizes and shell thicknesses were also synthesized. These samples were tested in the catalytic hydrogenation of p-chloronitrobenzene. The activity and selectivity were found to be tunable, depending on the composition of the bimetallic alloys.
AuPd@m-SiO2 NPs with a 1/1 molar ratio of Au/Pd showed the highest selectivity for the hydrodechlorination of p-chloronitrobenzene.
研究领域:
材料科学
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催化
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jiale Huang,Dengpo Huang,Yi Liu,Huimei Chen,Xiaolian Jing,Daohua Sun,Qingbiao Li
Gold recovery is of practical significance while functional Au nanostructures are of great interest in modern nanotechnology. In this work, highly and hierarchically branched Au nanowires (AuNWs) were produced to obtain bio-AuNW composites while the Au was effectively recovered from aqueous HAuCl 4 solution by a microorganism-mediated, surfactant-directed (MSD) approach with Lactobacillus spp. cells (LSCs). Ternary coordination of the cell-surfactant-AA played an important role in recovering Au and producing the bio-AuNW composites in the cases of tetradecyl trimethyl ammonium bromide (TTAB), hexadecyltrimethylammonium bromide (CTAB) and octadecyl trimethyl ammonium bromide (OTAB). In contrast, Au recovery could not be achieved with hexadecyltrimethylammonium chloride (CTAC). Strong interaction between [AuCl 4 ] − and the LSCs prior to addition of surfactant (except CTAC) and ascorbic acid (AA) was vital for the highly and hierarchically branched nanostructures. Furthermore, the bio-AuNW composites could serve as excellent surface-enhanced Raman spectroscopy (SERS) substrate. the SERS detection limits of toxic rhodamine 6G (R6G) and 4-mercaptobenzoic acid (MBA) with the bio-AuNW composites are down to 10 −9 and 10 −6 M, respectively. This work therefore exemplifies combining recovery of Au and fabrication of functional Au nanomaterials, which was environmentally benign and application-oriented.
研究领域:
环境科学
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纳米技术
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材料科学
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
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