MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Li Gong,Siwei Jin,Renlong Liu,Zuohua Liu,Yijiao Zhang,Li Zhang,Tengda Zhao,Huanbao Fa,Wei Yin
Achieving the real-time, low-cost, portable and accurate NH 3 detection is of great importance in industry owing to the toxicity of NH 3 . In this paper, Pt NPs@MIL-101-NH 2 composites modified screen-printed electrodes (SPEs) were prepared by solvothermal method and ionic liquids [BMIM][BF 4 ] were used as electrolytes. Finally, the prepared Pt NPs@MIL-101-NH 2 /SPEs were combined with a miniature electrochemical workstation to construct a novel electrochemical NH 3 sensor. The experimental results showed that Pt NPs@MIL-101-NH 2 has excellent adsorption capacity for NH 3 , and the sensor has good linearity in the range of 0.7–600 ppm with low limit of detection (0.58 ppm) and fast response time for 10 ppm NH 3 (8.0 s). Furthermore, this sensor also possesses excellent stability, reproducibility, anti-interference and accuracy. The synthesized Pt NPs@MIL-101-NH 2 nanocomposite was proved to be an excellent candidate for constructing high-performance NH 3 sensor for industry.
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Honghai Liu,Decheng Wan,Jiang Du,Ming Jin
Straightforward organization of platinum nanoparticles (PtNPs) onto a macroscopic and robust material is described. PtNPs are in situ produced and stabilized by a dendritic amphiphile, where the latter consists of a hyperbranched polyethylenimine (PEI) as core and poly(styrene-co-2-ethylhexyl acrylate (P(St-EHA)) as shell. The resulting Pt@PEI@P(St-EHA), upon mixing with biphasic water and oil (a mixture of EHA and a dimethacrylate cross-linker in toluene), can self-assemble along the water/oil (W/O) interface and result in a stable emulsion. At W/O = 80/20 (volume ratio), a high internal phase emulsion (HIPE) forms and can be radically transformed into an open-cellular and elastic monolith termed Pt-polyHIPE, with PtNPs decorated on the surface. The Pt-polyHIPE is mechanically robust, and the cross-linking homogeneity by the dimethacrylate is responsible for the strength. The Pt-polyHIPE shows an active catalytic property, as evaluated by reduction of 4-nitrophenol. The material is conveniently and well recyclable, showing no decrease in catalytic activity at least within 20 cycles. Energy-dispersive X-ray spectra and thermogravimetric analysis also support sufficient retaining of the Pt species, where the multivalent and multiligand PEI should be responsible for this property.
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PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Dongliang Zhang,Haigang Hou,Liuxu Yu,Jian Yang,Guiwu Liu,Junlin Liu,Guanjun Qiao
The rapid development and popularization of infrared detectors have expressed higher and urgent requirements for the light harvesting and photothermal conversion capability of infrared sensitive films. Herein, a hierarchical porous carbon (HPC) derived from polymer carbonization was employed as the porous framework, and then was modified with Pt and Ag particles to construct an efficient photothermal conversion film with ultra-wide infrared spectrum absorption. The light-trapping effect of special porous microstructure, introduction of enormous defects, and intrinsic strong absorption of carbon materials enables the HPC film to holds an absorbance of 72.74 % over the range of 2–20 μm, which could be further improved by about 1.3 times to 94.75 % after Pt and Ag particles (AgPt@HPC) were introduced onto the framework because of the additional plasmon effect and the establishment of complex electric field coupling mechanisms. Moreover, photothermal conversion efficiency of AgPt@HPC film also witnesses a great improvement by about 1.8 times compared with HPC film, and the boosted charge transfer between Ag, Pt and C was confirmed to provides a significant contribution to photothermal conversion. The proposed ultra-wide infrared sensitive film is not only designed for infrared detectors, but also has the potential to provide reference for the development of functionalized photothermal nanomaterials.
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JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Xiaomei Ning,Yuhang Li,Baoqiang Dong,Hongjuan Wang,Hao Yu,Feng Peng,Yanhui Yang
The influence of catalyst synthesis strategy, including ethylene glycol (EG) reduction, sodium borohydride reduction and impregnation-H 2 -reduction, on the metal-support-interaction of Pt on nitrogen-doped carbon nanotubes (Pt/NCNTs) was systematically investigated and summarized. The catalytic performances were explored in the electro-oxidation reactions of glycerol, formic acid and CO, and the hydrolysis of ammonia borane (AB). Through X-ray photoelectron spectroscopy (XPS), density functional theory calculations and CO stripping technique, it was revealed that the synthesis methods drastically affected the electronic property of Pt nanoparticles (NPs). Pt NPs preferentially interacted with graphitic nitrogen in EG reduction method due to the electron donating property of graphitic nitrogen, while preferentially interacted with pyridinic nitrogen and defects in the impregnation-H 2 -reduction method due to the vacancies containing N P favoring the charged metal ion adsorption. The catalytic activity strongly depended on the electronic property of Pt NPs, which can be ascribed by the binding energy of Pt4f 7/2 (0) from XPS. The higher catalytic activity was obtained over electron-enriched Pt NPs for the electro-oxidation reactions. On the other hand, electron-deficient Pt NPs had better intrinsic activity in AB hydrolysis. The results herein suggested that appropriate synthesis method should be rationally applied to maximize the activities of Pt for targeting reactions benefited from electron-enriched or electron-deficient metal NPs.
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Journal of Energy Chemistry
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2016
·
IF 2.322
Yuhang Xie,Hulin Zhang,Guang Yao,Saeed Ahmed Khan,Xiaojing Cui,Min Gao,Yuan Lin
In this paper In 2 O 3 nanoshells have been synthesized via a facile hydrothermal approach. The nanoshells can be completely cracked into pony-size nanocubes by annealing, which are then used as a support of Pt catalyst for methanol and ethanol electrocatalytic oxidation . The prepared In 2 O 3 and supported Pt catalysts (Pt/In 2 O 3 ) were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), field effect scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry and electrochemical impedance spectroscopy (EIS) were carried out, indicating the excellent catalytic performance for alcohol electrooxidation can be achieved on Pt/In 2 O 3 nanocatalysts due to the multiple active sites, high conductivity and a mass of microchannels and micropores for reactant diffusions arising from 3D frame structures compared with that on the Pt/C catalysts.
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CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Ting-Ting Zhang,Jing-Yang Jiang,Yan-Hua Wang
Various supported Pt-Pb bimetallic catalysts were prepared and applied for the catalytic conversion of nitrobenzene to p -aminophenol in the environmentally benign pressurized CO 2 /H 2 O system. Among the bimetallic catalysts prepared, Pt-Pb/SiO 2 is the best and nitrobenzene could be converted to p -aminophenol with a selectivity as high as 82% when the reaction was carried out using this catalyst at 110 °C under 5 MPa CO 2 and 0.2 MPa H 2 .
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ULTRASONICS SONOCHEMISTRY
·
2016
·
IF 4.556
Guanshu Li,Hongbo Zhang,Chunsheng Wei,Yingying Huang,Xuekai Dou,Yidi Wang,Jun Wang,Youtao Song
(5.0%)Er 3+ :Y 3 Al 5 O 12 /Pt-(TiO 2 -Ta 2 O 5 ) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er 3+ :Y 3 Al 5 O 12 /Pt-(TiO 2 -Ta 2 O 5 ) powder, the sonocatalytic decomposition of ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er 3+ :Y 3 Al 5 O 12 /Pt-(TiO 2 -Ta 2 O 5 ) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00 mg/L initial concentration, 1.00 g/L prepared (5.0%)Er 3+ :Y 3 Al 5 O 12 /Pt-(TiO 2 -Ta 2 O 5 ) powder (Ti/Ta = 1.00:0.25 heat-treated at 550 °C for 3.0 h) added amount, 150 min ultrasonic irradiation (40 kHz frequency and 300 W output power), 100 mL total volume and 25–28 °C temperature were adopted. Therefore, the (5.0%)Er 3+ :Y 3 Al 5 O 12 /Pt-(TiO 2 -Ta 2 O 5 ) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of ametryn in aqueous solution.
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APPLIED CATALYSIS A-GENERAL
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2017
·
IF 4.339
Lujie Liu,Hui Lou,Min Chen
Nano-Pt and Nano-Pd particles were introduced to modified multiwalled carbon nanotubes via co-impregnation method for hydrogenation of furfural in liquid phase using ethanol as a solvent. Different transition metal (Cr, Mn, Fe, Co, Ni) was used as promoters using Pt/MWNT and Pd/MWNT catalysts and various supports were also compared to further investigate the hydrogenation process of furfural. Among the catalysts investigated, Pt–Fe/MWNT (Pt: 0.5 wt%) showed highest conversion and selectivity to furfuryl alcohol (yield of 87.4%), while Pd–Ni/MWNT (Pd: 0.5 wt%) catalysts exhibited the best catalytic performance (83.3% yield of tetrahydrofurfuryl alcohol) under the optimized conditions of 30 bar hydrogen and 5 h, at 100 and 130 °C, respectively. Synergistic effect of bimetallic catalysts has been utilized to improve catalytic activity and stability. The extremely active for the selective hydrogenation of furfural over Pt–Fe/MWNT and Pd–Ni/MWNT catalyst might be attributed to active crystal planes exposed over Pt and Pd promoted by Fe and Ni. Catalysts have shown stable activity and selectivity after 5 cycles using Pt–Fe/MWNT and Pd–Ni/MWNT catalysts. Moreover, we suggest that acid sites of conventional supports might have an impact on furfural conversion.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Hui Liu,Qing Yu,Heyun Fu,Yuqiu Wan,Xiaolei Qu,Zhaoyi Xu,Daqiang Yin,Shourong Zheng
In this study, Pt catalysts supported on zeolite templated carbon (Pt/ZTC) were prepared by in-situ chemical vapor deposition using Pt exchanged Y zeolite as the template. For comparison, Pt catalysts supported on zeolite templated carbon (ZTC) and commercial activated carbon (AC) were prepared using the impregnation method. The liquid phase catalytic hydrodeiodination of two iodinated X-ray contrast media (ICM, i.e. , diatrizoate and iopamidol) was investigated on the catalysts. The catalysts were characterized by X-ray diffraction, N 2 adsorption–desorption isotherms, scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy and zeta-potential measurement. The results showed that Pt/ZTC catalysts prepared by in-situ chemical vapor deposition (CVD) under varied reaction conditions were good replicas of Y zeolite in structure. Compared with the catalysts prepared by the impregnation method, Pt/ZTC had a higher Pt dispersion and more homogeneous Pt distribution. Increasing CVD temperature resulted in Pt particle growth in Pt/ZTC. The catalytic hydrodeiodination of diatrizoate and iopamidol proceeded via a sequential deiodination pathway, and followed the Langmuir-Hinshelwood model, reflecting that the conversion of adsorbed ICM was the rate-controlling step. Additionally, more effective conversion of iopamidol was observed than that of diatrizoate on Pt/ZTC. Furthermore, Pt/ZTC prepared at higher CVD temperature exhibited lower catalytic activities for the hydrodeiodination of diatrizoate and iopamidol. Solution pH markedly impacted the catalytic ICM conversion, and enhanced hydrodeiodination was observed with the increase of pH. As for catalyst reuse, Pt/ZTC remained about 80% of initial activity after 4 reuse cycles, exhibiting much higher stability than the catalyst prepared by the impregnation method. The present findings highlighted the Pt/ZTC catalysts prepared by in-situ CVD as highly active and stable catalysts for the removal of halogenated organic pollutants by catalytic hydrogenation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qingmin Hu,Sen Wang,Zhe Gao,Yunqin Li,Qian Zhang,Qun Xiang,Yong Qin
The decoration of noble metal-based catalysts with metal oxides can improve their catalytic performance for the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol (COL) due to the interaction between the noble metal and metal oxides. Here, we used atomic layer deposition (ALD) to decorate Pt nanoparticles precisely with Fe oxides. The selectivity to COL increased from 45% for the bare Pt catalyst to 84% for the Pt-based catalyst after 30 cycles of decoration with Fe oxide by ALD. A series of characterizations demonstrated that the precise blocking of low coordinated Pt sites with Fe oxide by ALD, generating Pt-FeO x interfacial perimeter sites, and the interaction between the Pt nanoparticles and Fe oxide led to high selectivity to COL. This precise decoration and the formation of interfacial perimeter sites by ALD provide a promising route for the design of advanced catalysts.
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高影响因子
ANALYST
·
2015
·Vol. 140
·期 19
·6684-6691
·
IF 4.107
Fengmin Qiao,Zhenzhen Wang,Ke Xu,Shiyun Ai
A facile process was developed for the synthesis of FeSe–Pt@SiO2 nanospheres based on the hydrothermal treatment of FeCl3·6H2O, selenium and NaBH4 in ethanolamine solvent, followed by reducing HPtCl4 with NaBH4 in the presence of FeSe particles to obtain FeSe coated with Pt NPs (FeSe–Pt), ending with a surfactant assembled sol–gel process to obtain FeSe–Pt@SiO2. The morphology and composition of FeSe–Pt@SiO2 were characterized by transmission electron microscopy, high resolution TEM, X-ray diffraction and Fourier transform infrared spectroscopy. Structural analyses revealed that FeSe–Pt@SiO2 nanospheres were of regular spherical shape with smooth surfaces due to the SiO2 shells, compared with FeSe particles with 150 nm lateral diameter. The prepared FeSe–Pt@SiO2 nanospheres possessed both intrinsic glucose oxidase (GOx-) and peroxidase-mimic activities, and we engineered an artificial enzymatic cascade system with high activity and stability based on this nanostructure. The good catalytic performance of the composites could be attributed to the synergy between the functions of FeSe particles and Pt NPs. Significantly, the FeSe–Pt@SiO2 nanospheres as robust nanoreactors can catalyze a self-organized cascade reaction, which includes oxidation of glucose by oxygen to yield gluconic acid and H2O2, and then oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 to produce a colour change. Colorimetric detection of H2O2 and glucose using the FeSe–Pt@SiO2 nanospheres was conducted with high detection sensitivities, 0.227 nM and 1.136 nM, respectively, demonstrating the feasibility of practical sensing applications. It is therefore believed that our findings in this study could open up the possibility of utilizing FeSe–Pt@SiO2 nanospheres as enzymatic mimics in diagnostic and biotechnology fields.
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ACS Catalysis
·
2015
·
IF 9.312
Jingyi Hu,Qiwei Yang,Lifeng Yang,Zhiguo Zhang,Baogen Su,Zongbi Bao,Qilong Ren,Huabin Xing,Sheng Dai
Metal catalysts often encounter the dilemma of rapid deactivation due to reduction or particle aggregation/growth during the reaction. Here we reported an active and stable metal nanoparticles (NPs)/surfactant ionic liquid (IL) system for the catalytic hydrochlorination of acetylene. The NPs of Pd, Au, and Pt with a narrow size distribution and well-defined lattice fringes experienced in situ generation in the reaction medium of anionic surfactant carboxylate ILs (ASC-ILs). Benefiting from the high reactivity of NPs and the self-assembly property of ASC-ILs, an effective redox cycle between Pd0 and PdII was established to reduce the deactivation of metal catalysts. The Pd NPs/surfactant IL systems showed excellent catalytic activity toward acetylene hydrochlorination. An acetylene conversion of 93% and a selectivity of 99.5% were achieved with no discernible deterioration over a reaction time of 55 h. Furthermore, ASC-ILs were endowed with a unique property of the strong hydrogen-bond basicity, which was effective in absorbing and activating acetylene and HCl. This study manifests that metal NPs/surfactant IL systems are promising as substitutes for toxic mercury catalysts in the hydrochlorination of acetylene, and also is instructive for the stabilization of metal NPs.
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