JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2015
·
IF 3.615
Huiyan Pan,Xiaohong Li,Yin Yu,Junrui Li,Jun Hu,Yejun Guan,Peng Wu
Metal organic-framework MIL-101 and inorganic mesoporous composites Al 2 O 3 @SBA-15 supported Pt catalysts, Pt/MIL-101 and Pt/Al 2 O 3 @SBA-15 catalysts, were prepared and characterized by means of X-ray diffraction (XRD), N 2 adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), CO chemisorption and thermo-gravimetric (TG) analysis. Pt nanoparticles were highly dispersed on both supports. In liquid-phase hydrogenation of nitrobenzene, benzaldehyde and their derivatives, the Pt/MIL-101 catalyst was superior to the Pt/Al 2 O 3 @SBA-15 catalyst in water. For liquid-phase hydrogenation of nitrobenzene with the Pt/MIL-101 catalyst, owing to high solubility of nitrobenzene in ethanol, the reaction in ethanol went much faster than that in water, furnishing a turnover frequency (TOF) in ethanol up to 18,053 h −1 , almost triple of that obtained in water under similar conditions. The highest TOF of 25,438 h −1 was obtained in ethanol for hydrogenation of 3-chloro-nitrobenzene with the Pt/MIL-101 catalyst. As for hydrogenation of benzaldehyde series, 2-fluoro-benzaldehyde and 3-fluoro-benzaldehyde gave the highest TOFs of 5146 h −1 and 3165 h −1 in water with the Pt/MIL-101 and Pt/Al 2 O 3 @SBA-15 catalysts, respectively. We deduce that surface property of MIL-101 with high hydrophobicity is helpful to enrich reactants around the Pt/MIL-101 catalyst in water, where nitrobenzene or benzaldehyde and its derivatives have a limited solubility, so that high catalytic performance was achieved with the Pt/MIL-101 catalyst in water. Of particular note is that the Pt/MIL-101 catalyst can be reused at least four times without loss in activity or selectivity.
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
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Zhiming Chen,Bo Xu,Xiaomei Wang,Li Zhang,Xiaoqing Yang,Cuncheng Li
Separation and recycling of noble metal nanoparticles after catalytic reaction is critical to promote its application efficiency and cut down the cost. This work presents a facile synthesis strategy for the fabrication of sandwich-like MIL-100(Fe)@Pt@MIL-100(Fe) (denoted as S-Pt) nanoparticles with high stability and improved catalytic activity for hydrogenation of nitrophenol. MIL-100(Fe) acts as both carrier to make the catalyst easily separated and shield to protect the tiny Pt nanoparticles from leaching or aggregation during reaction. Moreover, mass transfer effect of the porous MIL-100(Fe) with its pore structure serving as nano-reactor is also benefit for promoting the catalytic efficiency.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2016
·Vol. 2017
·期 1
·172-178
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IF 2.686
Gui-lin Zhuang,Jia-qi Bai,Xiang Zhou,Yi-fen Gao,Hong-liang Huang,Hai-quan Cui,Xing Zhong,Chong-Li Zhong,Jian-guo Wang
Graphical The effects of metal–organic framework (MOF) supports on catalytic activity were uncovered for highly dispersed Pt nanoparticles (NPs) loaded in UiO-67. Investigations of the effects of the support on catalytic properties are important for heterogeneous systems. Herein, we report the preparation of highly dispersed Pt nanoparticles (NPs) in three isomorphous UiO-67-type metal–organic frameworks (MOFs), namely, pristine UiO-67, N-UiO-67, and NH 2 -UiO-67. Structural measurements revealed that the sizes of the Pt NPs were 4.5 nm for Pt/UiO-67 and 2.5 nm for N-UiO-67 and NH 2 -UiO-67. The dominant influences on the sizes of the Pt NPs are the functional groups of the support and the pore size of the MOF. Furthermore, CO catalytic oxidations were performed as a model reaction. Interestingly, the catalytic performance sequence is 5 % Pt/N-UiO-67 > 5 % Pt/UiO-67 > 5 % Pt/NH 2 -UiO-67. A combination of experimental measurement and DFT calculation revealed that the catalytic properties depend on not only the size of the Pt NPs but also the nature of the support.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Xinglan Zhou,Jiahui Zhang,Xiaoyan Lan,Zipan Jiao,Bingxin Liu,Yunsi Wang,Peng Zhang,Benhua Xu
The electrochemical catalytic hydrogen evolution reaction (HER) holds significant potential for the sustainable production of environmentally friendly hydrogen energy. Currently, the precious metal Pt is widely acknowledged as the most superior electrocatalyst. However, its limited availability and exorbitant cost impede its extensive application. In this study, low Pt-loaded three-dimensional (3D) porous carbon composites were successfully synthesized as catalysts using a template-free method and a high-temperature pyrolysis method. By evaluating the HER performance of different Pt concentrations of the catalysts Pt/C-X (X=0, 0.05, 0.1, 0.2, 0.4, 0.7 mmol) in acid solution, it was observed that the overpotential of Pt/C-0.2 reached as low as 17 mV with a significantly low Tafel slope value of 48 mV cm −2 . Meanwhile, the Bilayer capacitance (C dl ) reached an impressively high value of 247.5 mF cm −2 . Consequently, this also provides a promising way to enhance the catalytic performance of the loaded catalysts.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Engineering Materials
·
2024
·
IF 0
Liangyu Zhai,Xinliang Dai,Fei Rao,Lujun Zhu,Peizhi Yang,Siyan Wang,Xianjin Shi,Yu Huang,Yanmin Jia,Gangqiang Zhu
The performance of gas sensor materials was normally enhanced by modifying the surface with a noble metal loading and controlling the morphology of the material. In this research, the Sn2O3 nanoflowers formed by ultrathin nanosheets are modified by loading Pt nanoparticles in varying proportions, and the materials were prepared through a hydrothermal method. The structure, morphology, band gap, and specific surface area of the as-prepared samples are characterized by various techniques, and the effect of the contact between Pt nanoparticles and Sn2O3 nanoflowers on the sensitivity, response/recovery time, detection limit, and selectivity of formaldehyde gas sensing is investigated. Transmission electron microscopy (TEM) results confirm the uniform loading of Pt nanoparticles with sizes of 2–5 nm on the Sn2O3 nanoflowers. The performance test results reveal that compared to pure Sn2O3, the optimal operating temperature of the Pt-Sn2O3 sensor loaded with a mass ratio of 3% decreases from 200 to 90 °C, and the detection efficiency for formaldehyde gas is significantly improved. The response time is shortened from 143 to 39 s, and the recovery time is reduced from 237 to 58 s. The method exhibits high sensitivity (Ra/Rg = 3.66, 1 ppm) for low-concentration formaldehyde. Moreover, the gas sensor demonstrates excellent stability and repeatability. These outstanding performances are attributed to the large specific surface area and abundant reaction sites of the ultrathin Sn2O3 nanosheets as well as the catalytic effect of noble metal loading. The finding holds significant reference value and promising application prospects for rapid detection of low-concentration formaldehyde.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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2017
·
IF 0.736
Hongcheng Peng,Weihong Qi,Wenhai Ji,Siqi Li,Jieting He
Combining the bond-energy model and Debye theory, we generalized the Gibbs free energy model for Cu–Pt nanoparticles (NPs) by introducing a shape factor considering the shape effect. We studied the structural stability of the Cu–Pt NPs and plotted the corresponding composition-, shape- and size-dependent phase diagrams. It is shown that the Cu–Pt NPs can form alloyed structure in a large size range. But when the particle size continues to decrease, the NPs will form the core–shell structure due to surface segregation. Meanwhile, the composition segregation could make the atoms of less-content element to gather in the surface. The predictions from the present calculated phase diagrams are consistent with a series of experimental results in literatures. To further prove the efficiency of the phase diagrams, we synthesized the alloyed Cu–Pt NPs of 4–15 nm by a co-reduction method, which is in agreement with the predictions from the phase diagrams.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Yiwen Jiang,Ling Zhang,Yiquan Xie,Shichao Han,Qiuyan Zhu,Xiangju Meng,Feng-Shou Xiao
A series of zeolite-supported Pt nanoparticles (Pt/NaZSM-5) have been prepared by adjusting Si/Al ratio of NaZSM-5 zeolite from 60 to pure silica. Catalytic tests in propene oxidation as an important model reaction for removal of hydrocarbons emitted from automobiles during cold-start, show that the catalytic activities significantly increase with Si/Al ratios of NaZSM-5 zeolite in these Pt/NaZSM-5 catalysts. As a typical example, Silicalite-1 supported Pt nanoparticles exhibits the highest activity, giving the 50% conversion temperature (T 50 ) and 90% conversion temperature (T 90 ) at 112 °C and 118 °C, respectively. Characterizations of these catalysts with multiple techniques show that the enhanced catalytic activities are strongly related to the zeolite Si/Al ratios of the catalysts, where an increase of zeolite Si/Al ratio is favorable for the adsorption of propene, promoting the propene oxidation. This feature might offer a good opportunity to design and prepare highly efficient heterogeneous catalysts for removal of light olefins in the future.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaohong Ma,Danyang Li,Yuheng Jiang,Huacheng Jin,Liuyang Bai,Jian Qi,Feifei You,Fangli Yuan
Utilizing solar energy to convert carbon dioxide (CO 2 ) into chemical fuels could simultaneously mitigate the greenhouse effect and fossil fuel crisis. Herein, a heterogeneous photocatalyst of ZnO nanofiber deposited by Pt nanoparticles was successfully synthesized toward photocatalytic CO 2 reduction via radio-frequency thermal plasma and photo-deposition method. The Pt nanoparticles were introduced on the surface of ZnO nanofibers to broaden the light absorption and utilization, increase the additional reaction active sites and facilitate the separation of photo-generated electron/hole pairs. Combined with the natural advantages of short transfer path of charge carriers and self-support effecting in humid reaction environment for nanofibers, the Pt/ZnO hetero-junction nanocomposites displayed superior photocatalytic activity for CO 2 reduction with respect to bare ZnO nanofibers, affording a CO-production rate as high as 45.76 μmol g −1 h −1 under 300 W Xe lamp irradiation within a gas–solid reaction system. Furthermore, in-suit Fourier transform infrared (FTIR) spectra were applied to unveil the details during photocatalytic CO 2 reduction. This work presents a hetero-junction nanocomposite photocatalyst based on eco-friendly semiconductor and metal materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ping Guo,Xuyang An,Xinxin He,Yinhua Hu,Jia Zhang
NO 2 is a prevalent atmospheric pollutant known to cause significant harm to both the environment and human health. In practical applications, the development of NO 2 sensors capable of functioning over a wide humidity range with high sensitivity and stability is crucial. Here, the Pt-decoration multi-scale three-dimensional Bi 2 S 3 nanoflower structure assembled by one-dimensional nanorods and two-dimensional reticulated nanomeshes was constructed by integrating the geometrical and electronic effects. The Pt/Bi 2 S 3 based sensors exhibit a high response of 3.92 and rapid response/recovery times of 15 s/136 s to 1 ppm NO 2 at room temperature. Furthermore, the Pt/Bi 2 S 3 based sensors show excellent selectivity and stability across a wide range of humidity levels (10 %-90 %RH). Finally, a portable NO 2 detector was designed for data acquisition and wireless transmission to enable real-time gas detection and hazard warning. Our study presents a multi-scale structure for sensitive materials design and practical application of high-performance NO 2 sensors operated in a wide humidity range at room temperature.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Chaoxin Yang,Xiao Li,Zhenzhou Zhang,Bohan Lv,Jiachun Li,Zhenjian Liu,Wanzhen Zhu,Furong Tao,Guangqiang Lv,Yongxing Yang
The oxidation of 5-hydroxylmethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a sustainable and promising method for the preparation of bio-derived aromatic polyesters . Nitrogen doped carbon material is an effective catalyst support in preparing supported nanoparticle metal catalysts in heterogeneous reactions . In this work, by pyrolysis of bio-waste carbon material, pomelo peel, under 800 °C flowing NH 3 , high nitrogen (up to 11.4 wt%) doped porous carbon material (NC) was facilely obtained. Pt nanoparticles (NPs) can be uniformly dispersed on NC surface and stabilized by the doped nitrogen dopant . Supported Pt NPs by NC-800 (Pt/NC-800) was proved to be an efficient catalyst in aerobic oxidation of HMF into FDCA. Control experiments show that the oxidation of 5-hydrox-ymethyl-2-furancarboxylic acid (HMFCA) to 5-formyl-2-furancarboxylic acid (FFCA) by supported Pt NPs was the key step to determine the oxidation rate of HMF to FDCA. With controlled experiment results and previous reports, a catalytic mechanism involving water, molecular O 2 , hydroxyl ions and Pt NPs was given and explained well of the phenomenon of high HMFCA concentration accumulation during reaction.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yaowei Lu,Yongxing Wang,Qinghu Tang,Qiue Cao,Wenhao Fang
The synergistic effect in a bimetallic oxide usually plays a vital role in determining the behavior of supported-metal catalysts. We show the unique synergy in a Sn x Mn 1 O y oxide, which can boost the hydrogenation catalysis of supported Pt nanoparticles for selective conversion of levulinic acid (LA) to γ-valerolactone (GVL). On a series of Pt/Sn x Mn 1 O y catalysts with a similar Pt loading ( ca. 0.44 wt%) and a controlled Pt size ( ca. 2.7 nm), the intrinsic TOF presents a volcano-like dependence on Pt 0 sites and Lewis acidity, which is determined by the variable synergistic effect between MnO y and SnO y . The optimal Pt/Sn 0.8 Mn 1 O y catalyst exhibits a high i TOF of 2709 h −1 and achieves 100% selectivity to GVL at 99% conversion of LA at 120 ℃ and 2 MPa of H 2 . DFT calculations demonstrate that the incorporation of Sn can provide a lower energy barrier for the crucial elementary reactions.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Linsen Li,Xiang Gong,Zhuwei Yang,Riguang Zhang,Zhao Jiang,Tao Fang
As the candidates for large-scale hydrogen storage , liquid organic hydrogen carriers (LOHCs) exhibit evident advantages in hydrogen storage density and convenience of storage and transportation. Among them, NECZ (N-ethylcarbazole)/12H-NECZ (dodecahydro-N-ethylcarbazole) is considered as a typical system with the lower hydrogenation/dehydrogenation temperature. However, the low dehydrogenation efficiency restrict its commercial applications. In this work, the single-layer Ti 3 C 2 T x MXene was employed as the support to load the Pt nanoparticles for the 12H-NECZ dehydrogenation reaction. The effect of transition metals , loading amounts and morphologies of catalysts were analyzed. It was found that the 3 wt% Pt/S–Ti 3 C 2 T x catalyst exhibited the best catalytic performance with 100% conversion, 91.55% selectivity of NECZ and 5.62 wt% hydrogen release amount at 453 K, 101.325 kPa for 7 h. The product distributions and kinetics analysis suggested that the elementary reaction from 4H-NECZ to NECZ was the rate-limiting step. The selectivity of NECZ is sensitive to the dehydrogenation temperature. Combined with the XRD , SEM , HRTEM , XPS , BET and FT-IR results, it could be indicated that the special two-dimension structure of S–Ti 3 C 2 T x and electronic effect between Pt and S–Ti 3 C 2 T x enhanced the dehydrogenation efficiency of 12H-NECZ. The measurements of cyclic dehydrogenation indicated that the Pt/S–Ti 3 C 2 T x catalyst exhibited good stability after 42 h. This work brought a new strategy for the design of efficient catalysts using two-dimensional materials in the applications of the liquid organic storage hydrogen technology .
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
危险品化学品经营许可证（带存储）