INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Junjie Ding,Li Ma,Mengyu Gan,Wang Zhan,Chenglong Zhou,Deying Wei,Sichen Han,Jun Shen,Fei Xie,Xiujuan Zhong
Limited by unsatisfactory mass diffusion and complex fabrication procedures, nanoporous carbons (NPCs) don't perform well, served as catalyst supports. Herein, utilizing nitrogen-doped carbon nanotubes (NCNTs) as spacers of nitrogen-doped graphene-like carbon nanosheets (NGs), a 3D nanoarchitecture (Co@NCNT-NG-900) is fabricated via a facile and eco-friendly approach. Physical characterizations manifest that the in situ-formed NCNTs make for improving graphitic degree, NGs contribute to increasing the specific surface area and the level of N-doping, meanwhile, the spacers effects of NCNTs promote the formation of opened macropores , what's more, Co@NCNT-NG-900 mainly consists of three-dimensional macropores and oversized mesoporous (3D macro-/oversized mesoporous), unlike conventional NPCs. Benefiting from improved charge transfer rate, enhanced N-doping level and dominant 3D macro-/oversized mesoporous, Co@NCNT-NG-900 is evaluated as an ideal Pt support for methanol oxidation reaction (MOR) in acid and alkaline medium . This work provides a facile synthetic method for NPCs and sheds directive light into the research of efficient catalysts for MOR.
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LANGMUIR
·
2022
·
IF 4.331
Liang Sun,Zhinan Fu,Enguang Ma,Jiangtao Guo,Ziyu Zhang,Wenxin Li,Li Li,Zhiyong Liu,Xuhong Guo
Distinct platinum (Pt) nanozymes as peroxidase mimics have received extensive interest owing to their outstanding catalytic activity, high environmental tolerance, lower consumption, and great potential in replacing natural enzymes. However, easy agglomeration of Pt nanoparticles (Pt NPs) resulting from the high surface free energy significantly decrease their peroxidase-like activity. Herein, spherical polyelectrolyte brush (SPB)-stabilized ultrasmall Pt NPs (SPB@Pt NPs) were prepared by a novel synthetic strategy where the SPB not only performed as a nanoreactor for the synthesis of ultrasmall Pt NPs but also greatly stabilized Pt NPs against aggregation. The well-defined SPB@Pt NP nanozymes exhibited outstanding peroxidase-like activity for the catalytic oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidized TMB and were then used to establish a colorimetric sensor for rapid detection of cysteine, giving a limit of detection of 0.11 μM. Moreover, the colorimetric detection system was demonstrated with outstanding performance in sensitive and selective detection of cysteine in the presence of several interference molecules. From these results, SPB@Pt NPs have been regarded as promising peroxidase mimics for a large number of applications such as in biosensing, biomedicine, the food industry, and environmental chemistry.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Caiyun Xu,Kaijie Li,Hongbo Yu,Mingxi Liu,Shenghu Zhou
In this work, Pt nanoparticles encapsulated hollow porous silica nanoreactors (Pt@HPSNs) was synthesized in one-pot by a reverse microemulsion system, and they exhibit good catalytic efficiency and stability for semihydrogenations of alkynes . The key design concept is to form Pt hydroxide nanoparticles mixed poly(ethyleneimine) nano-aggregates in water droplets, which further functions as seeds for silica deposition and the void templates to form the central voids. The Pt@HPSNs illustrate a wide adaptability for semihydrogenations of a series of terminal alkynes to the corresponding alkenes at mild reaction conditions, and demonstrate high yields of styrene for semihydrogenation of phenylacetylene, showing good catalytic efficiency for hydrogenation of phenylacetylene to styrene at atmospheric H 2 pressure. The enhanced catalytic performance of Pt@HPSNs are ascribed to their hollow porous nanostructures , where the confinement of Pt nanoparticles in voids increase the structural stability and the confinement effect may increase the collision of reactants and Pt, resulting in improved catalytic efficiency.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 4
·1767-1776
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IF 3.925
Mu Zhou,Shuangde Li,Shaohua Chai,Tao Wang,Linfeng Nie,Yunfa Chen
A bifunctional adsorption-catalysis system for the abatement of trace amounts of toluene was developed and realized by loading different amounts of Pt on mesoporous silica synthesized with ionic liquid with hydrophobic modification. The textural properties were evaluated using BET, contact angle, XRD, IR, XPS, TEM, and H2-TPR techniques. The capability of the synthesized catalysts for room-temperature adsorption and low-temperature catalysis of toluene was appraised. The hydrophobic sample exhibited better toluene adsorption capacity of 53.1 mg g−1 than SiO2-350 and 3.0Pt/SiO2 samples with 28.3 mg g−1 and 18.9 mg g−1, respectively. Furthermore, the hydrophobic sample showed increased maximum desorption temperatures of 52 °C in comparison with those at 44 °C and 37 °C, which acted as a good adsorption buffering system. 3.0Pt/SiO2-H showed the best toluene conversion capacity at T90 = 129 °C, together with superior water vapor resistance and sequential capture-destruction performances. The increased bifunctional adsorption-catalysis performance with hydrophobic modification may be ascribed to the change in surface functional groups. The prepared system could be a valuable candidate material for adsorption-catalysis integration and assistance for VOCs elimination technology in barren waste gases.
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Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-10
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IF 7.9
Li Guanglei,Chen Yao,Liu Fei,Bi Wenhua,Wang Chenxin,Lu Danfeng,Wen Dan
It is important to monitor the intra-/extracellular concentration of hydrogen peroxide (H 2 O 2 ) in biological processes. However, miniaturized devices that enable portable and accurate H 2 O 2 measurement are still in their infancy because of the difficulty of developing facile sensing strategies and highly integrated sensing devices. In this work, portable H 2 O 2 sensors based on Pt-Ni hydrogels with excellent peroxidase-like and electrocatalytic activities are demonstrated. Thus, simple and sensitive H 2 O 2 sensing is achieved through both colorimetric and electrochemical strategies. The as-fabricated H 2 O 2 sensing chips exhibit favorable performance, with low detection limits (0.030 μM & 0.15 μM), wide linearity ranges (0.10 μM–10.0 mM & 0.50 μM–5.0 mM), outstanding long-term stability (up to 60 days), and excellent selectivity. With the aid of an M5stack development board, portable visual and electrochemical H 2 O 2 sensors are successfully constructed without complicated and expensive equipment or professional operators. When applied to the detection of H 2 O 2 released from HeLa cells, the results obtained by the developed sensors are in good agreement with those from an ultraviolet‒visible spectrophotometer (UV‒vis) (1.97 μM vs. 2.08 μM) and electrochemical station (1.77 μM vs. 1.84 μM).
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Zhuoran Wang,Wenjia Li,Zhou Zhang,Lili Jia,Jia Wang
The hydrogenolysis of glucose to 1,2-propylene glycol (1,2-PG) has become a powerful and practical approach to using biomass resources. A series of Pt (2%)/WOx (7.5%) catalysts supported on different kinds of γ-Al2O3 were prepared by stepwise incipient wetness impregnation. The effects of Al2O3 supports on the physicochemical parameters and catalytic capabilities of catalysts used in the hydrogenolysis of glucose to 1,2-PG were investigated. Subsequently, an attempt was made to relate the catalytic activities to the structures of the W species. When Nano-Al2O3 was used as the support, the Pt/WOx/Nano-Al2O3 catalyst demonstrated the best performance, yielding 55.8% 1,2-PG after heating at 245 °C for 1 h. The excellent performance of the Pt/WOx/Nano-Al2O3 catalyst was attributed to the high dispersion of the Pt center and the optimal W species structure on the catalyst surface (monodisperse W species coexisting with the polymerized W species).
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APPLIED CATALYSIS A-GENERAL
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2023
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IF 5.5
Yu Liang,Lanjiang Wang,Xuekuan Li,Mingxing Tang,Qiong Tang,Jinxiang Dong,Lei Liu
Supported Pt catalysts are widely applied for the hydrogenation of polycyclic aromatic hydrocarbons, but it remains a challenge to achieve deep hydrogenation with high atomic utilization. Herein, a novel approach that combines physical vapor deposition with ozonation treatment was developed to construct the highly dispersed Pt on HY zeolite. The high concentration of O 3 was utilized to remove the ligand of acetylacetone platinum under mild condition due to its strong oxidizing properties, which markedly inhibited the aggregation of the Pt species. The hydrogenation of naphthalene and anthracene was investigated on such catalysts and compared with the catalyst prepared by traditional calcination approach, it was found that the co-existence of Pt single-atom and cluster on HY of 1Pt/HY-O 3 exhibited significantly high catalytic performance in the hydrogenation of naphthalene and anthracene, which was beneficiated from the synergistic effect of Pt single-atoms and clusters on HY support.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liu Yang,Jing Li,Guoqiang Cao,Yiyan Yang,Wen Luo,Zhiqi Zhang,Lizhi Feng,Xinglai Zhang,Baodan Liu
This study reports on the development of highly-efficient Pt/CuO-Fe 2 O 3 /TiO 2 monolithic catalysts for the low-temperature conversion of NO to N 2 via CO-SCR. In this case, ultrathin TiO 2 nanosheet arrays are designed to in situ grow on flexible Ti mesh to provide more spaces/areas for the loading of highly-dispersed Fe 2 O 3 and CuO active components. Furthermore, Pt nanoparticles with an average size of 1.30 nm are effectively decorated on the surface of CuO-Fe 2 O 3 /TiO 2 . The H 2 -TPR and NO-TPD results demonstrate that the excellent synergistic effect between TiO 2 , CuO, Fe 2 O 3 and trace amounts of Pt is conducive to enhance the adsorption of NO and finally promote the CO-SCR. The obtained Pt/CuO-Fe 2 O 3 /TiO 2 catalysts exhibit excellent CO-SCR performance with 100 % NO conversion, and 100 % N 2 selectivity at 250 °C, showing great potential of de-NO x application by using toxic CO as reductant in industry.
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Ke Li,Mengxia Yan,Haili Wang,Lifen Cai,Ping Wang,Huimin Chen
As a typical high-efficient alkane aromatization catalyst, Pt/KL is prone to deactivation due to the sintering growth of Pt on the outer surface of KL and the channel blockage caused by carbon deposition , which is further exacerbated by the one-dimensional channel structure of KL. Therefore, a series of encapsulated catalysts combining the three-dimensional channel structure advantages of S-1 with the role of potassium are prepared and evaluated. It is shown that the encapsulated catalyst KPt@S-1-02 modified by moderate potassium exhibits extremely superior stability and no significant deactivation is observable after n-heptane aromatization for 180 h under harsh conditions. On the one hand, encapsulation structure enables a strong anti-agglomeration ability of Pt and the topological structure of S-1 endows the encapsulation catalysts less susceptible to channel blockage, which has been demonstrated by HAADF-STEM and N 2 -adsorption. On the other hand, characterizations involving NH 3 -TPD, CO-DRIFT and HAADF-STEM verify that the modification by an appropriate amount of K can inhibit acid sites of catalysts and improve Pt dispersion and electron density, thus enhance the stability of catalysts. However, excessive K can serve as weak acid sites, poison of active sites and inhibitor of H 2 adsorption on Pt surface, leading to deactivation of the catalyst.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-13
·
IF 4.6
Chakari-Khiavi Forough,Mirzaie Arezoo,Khalilzadeh Balal,Yousefi Hadi,Abolhasan Rozita,Kamrani Amin,Pourakbari Ramin,Shahpasand Koorosh,Yousefi Mehdi,Rashidi Mohammad-Reza
Alzheimer’s disease (AD) is a progressive brain disorder characterized by the ongoing decline of brain functions. Studies have revealed the detrimental effects of hyperphosphorylated tau (p-tau) protein fibrils in AD pathogenesis, highlighting the importance of this factor in the early-stage detection of AD conditions. We designed an electrochemical immunosensor for quantitative detection of the cis conformation of the p-tau protein ( cis -p-tau) employing platinum nanoparticles (Pt NPs) supported on zeolitic imidazolate frameworks (ZIF) for modifying the glassy carbon electrode (GCE) surface. Under optimum conditions, the immunosensor selectively and sensitively detected cis-p-tau within the broad linear range of 1 fg mL −1 to 10 ng mL −1 and the low limit of detection (LOD) of 1 fg mL −1 with desired reproducibility and stability. Furthermore, the fabricated immunosensor's performance was examined for the cis-p-tau analysis in the serum of AD patients, indicating its accuracy and feasibility for real-sample analysis. Notably, this is the first application of Pt@ZIF-8 nanocomposite in fabricating a valid immunosensor for selective cis-p-tau detection, even in the presence of trans-p-tau. It is worth mentioning that the enzyme-linked immunosorbent assay (ELISA) reference technique is not able to evaluate pico- or femtomolar concentrations of cis-p-tau, making the fabricated immunosensor superior for early-stage measurement and screening of AD.
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FUEL
·
2022
·
IF 8.035
Zhensheng Shen,Gewei Zhang,Chengxiang Shi,Juncong Qu,Lun Pan,Zhenfeng Huang,Xiangwen Zhang,Ji-Jun Zou
Synthesis of fuels from lignin bio-oil feedstock significantly alleviates energy crises and environmental pollution. Phenol is the simplest model compound for lignin bio-oil feedstocks, and the synthesis of fuel precursors from phenol through alkylation has received increasing attention. Here we report a one-pot strategy for preparing polycyclic alkane high-density fuels from phenol and cyclohexanol over bifunctional Pt/Hβ catalyst by combining alkylation with following hydrodeoxygenation (HDO). The activity of different zeolites for catalyzing the alkylation of phenol and cyclohexanol was explored. It was found that the larger pore size of alkali treated Hβ would not limit the production of polycyclic compounds, and good acid content in a particular mesoporous specific surface area can speed up the reaction rate. The one-pot reaction conditions were then optimized. When the alkali treatment concentration is 0.2 mol/L, the metal loading is 0.2 wt%, and the molar ratio of phenol and cyclohexanol is 1:1, the highest conversion of phenol can reach more than 83 %. The selectivity of alkylphenol can reach more than 97 %, and the yield of bicyclic and tricyclic rings in the final product after HDO can reach 83.42 %. The bifunctional catalyst can also realize the coupling of other acid-catalyzed carbon growth reactions and metal-catalyzed HDO reactions, which allows the direct synthesis of fuel from lignin oil or other biomass compounds.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 17
·5058-5070
·
IF 5
Zihan Lv,Zeng Hong,Chao Qian,Shaodong Zhou
Pt–Pd alloy nano-catalysts supported on TiO2 were developed to enable efficient light-induced photocatalytic N-alkylation of amines with alcohols. Various techniques such as BET, XRD, XPS, HRTEM, UV-vis DRS, and PL analysis were utilized to characterize the catalysts. The photocatalytic mechanism was discussed based on observation as well as theoretical calculation. It was found that Pt serves as a hydrogen shuttle, extracting hydrogen from alcohols to Pd for subsequent hydrogenation on the Pd site. By changing the Pd/Pt ratio, it is feasible to tune the reaction rates of methanol dehydrogenation and imine hydrogenation simultaneously, resulting in an efficient N-alkylation reaction. As a result, the optimum catalyst Pd1Pt1/TiO2 exhibits excellent catalytic performance which is superior to the previously reported ones in terms of both the catalytic efficiency and the production capacity.
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