APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Hui Huang,Jun Wang,Yafei Xu,Rui Xu,Wuke Li
In this paper, a luminescent and thermo-responsive catalyst based on SiO 2 @Pt@PABI-Tb@PNIPAM was prepared by incorporating Pt nanoparticles , luminescent material and mesoporous silica with thermo-responsive polymer. The obtained catalyst was characterized by IR, TGA, UV–vis, SEM, TEM, X-ray photoelectron spectroscopy and luminescence. The hybrid catalyst exhibits “on-off” green luminescence in solution under UV irradiation, which could be observed by eyes. The catalytic results indicate that the dehydrogenation of ammonia borane (AB) catalyzed by SiO 2 @Pt@PABI-Tb@PNIPAM is thermo-controllable and switchable. The SiO 2 @Pt@PABI-Tb@PNIPAM shows high catalytic activity for the generation of hydrogen at room temperature. However, it exhibits much lower catalytic activity at high temperature. The catalysts exhibit excellent durability because the support and polymer could prevent the aggregation and leaching of Pt nanoparticles during catalysis. The catalytic research offers a new approach to the thermo-controllable application in the generation of hydrogen from AB.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Jin-Tao Du,Meng Qiao,Yuan Pu,Jie-Xin Wang,Jian-Feng Chen
The reduction of nitroarenes is usually catalyzed by heterogeneous catalysts. In this work, highly stable aqueous dispersions of monodisperse Pt, Pd, and Au nanoparticles stabilized by thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), are conveniently synthesized with the average sizes of 2.3, 3.1, and 2.3 nm, respectively. The modulation of the hydrophilic-hydrophobic nano-environments of the catalysts can be selectively provided by utilizing the temperature-responsive characteristics of PNIPAM. They are effective and thermosensitive pseudohomogeneous catalysts for nitroarenes reduction. The decreasing trend of catalytic activity is as follows: PNIPAM-Au > PNIPAM-Pd > PNIPAM-Pt. The catalytic reduction of nitrobenzene (NB), 4-nitrophenol (4-NP), and o-nitroaniline (o-NA) follow the pseudo-first-order kinetics, and the catalytic rates can be tuned by utilizing their temperature-responsive behavior. PNIPAM-Au nanocatalysts exhibit high turnover frequencies (TOF) up to 84, 12.9, and 40 min −1 for catalytic reduction of NB, 4-NP, and o-NA at 20 °C, respectively, which are one of the highest values ever reported.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Zhen Song,Jiameng Wang,Xiqing Zhang,Fanji Liu,Lihong Zhang
A series of MgF 2 -modified hydrotalcite-like (HT) derivatives supported Pt-In catalysts PtInHTR-X (X = NH 4 F, NaF and KF, R = reduced catalyst) were prepared by combination of hydrothermal method, alkali-etching and impregnation strategy and applied to direct dehydrogenation of isobutane to isobutene. The catalysts and precursors were characterized by XRD, SEM, TEM, XPS, TG, O 2 -TPO and low temperature N 2 adsorption-desorption isotherms. The formation of MgF 2 phase as dopant to modify the catalyst can influence the pore structure and even the surface acid properties of catalysts. Especially, compared with the three catalysts, PtInHTR-KF catalyst had better stability of isobutene selectivity of over 95% after 9 h reaction, and PtInHTR-NH 4 F and PtInHTR-NaF catalysts exhibited more stable isobutane activity of 60%. One of the reasons for this catalytic performance is that small particles of MgF 2 and unsaturated MgF 2 can provide weak acidic sites which can inhibit coke deposition. And it was found the improved catalytic performance was also related to the appropriate In 3+ /In 0 ratio, well-dispersed Pt species and the excellent anti-sintering ability of catalysts modified MgF 2 .
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yaru Wang,Jiaqin He,Xunxun Li,Mengmeng Wang,Yuanbo Zhou,Jun Xiao,Dongyun Chen,Jianmei Lu
MnO2 nanotubes loaded with Pt and Ni–Fe spinel were synthesized using simple hydrothermal and sol–gel techniques. After loading with Ni–Fe spinel, the specific surface area of the material increases 3-fold. This change helped to provide more active sites and facilitated the association between the catalyst and volatile organic compounds (VOCs). X-ray photoelectron spectroscopy determined that the adsorbed oxygen concentrations were all greatly increased after Pt loading, indicating that Pt promoted the adsorption of oxygen and so accelerated the combustion process. The performance of the catalyst after loading with 2 wt % Pt was greatly improved, such that the T90 for benzene decomposition was decreased to 113 °C. In addition, the 2% Pt/2Mn@NFO exhibited excellent low-temperature catalytic activity when reacting with low concentrations of toluene and ethyl acetate. This work therefore demonstrates a viable new approach to the development of Mn-based catalysts for the low temperature catalytic remediation of VOCs.
✓ 已验证
产品关联
DOI
PubMed
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.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Feng Zhang,Dongqing Zhang,Wenqi Liu,Jiyuan Miao,Xiaojin Li
Developing a feasible method to massively fabricate low-cost and efficient oxygen reduction reaction (ORR) catalysts is highly anticipated to the commercialization of fuel cells. In this work, N atoms were doped into inert sp2 configuration to alter the spin and charge distribution in the carbon matrix. The Pt/H2–N–C catalyst was successfully prepared by embedding ultralow Pt nanoparticles on N-based carbon. Results indicated that the protonated N-groups at edge sites efficiently regulated the absorption of the PtCl62– anion and widely limited the migration of Pt species at 1000 °C. The acquired Pt/H2–N–C electrocatalyst exhibited high ORR performance in the acidic electrolyte. The high-temperature proton exchange membrane fuel cell (HT-PEMFC) measurement illustrated that the open-circuit voltage and power density of the Pt/H2–N–C catalyst were higher than those of the commercial 20% Pt/C at 150 °C. This work provided a facile strategy to obtain efficient and low-cost Pt catalysts for ORR and HT-PEMFCs.
✓ 已验证
产品关联
DOI
高影响因子
COMPTES RENDUS CHIMIE
·
2019
·
IF 2.366
Hau Quoc Pham,Tai Thien Huynh,Hoang Ngoc Bich,Toan Minh Pham,Son Truong Nguyen,Le Trong Lu,Van Thi Thanh Ho
High cost and poor durability of Pt-based electrocatalysts are the main challenges for future commercialization of direct ethanol fuel cells (DEFCs). In the present work, a stable and effective Pt/Ti 0.8 W 0.2 O 2 electrocatalyst toward ethanol electrooxidation reactions (EORs) was prepared by utilizing the attributes of noncarbon catalyst supports and low Pt loading. The 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 electrocatalyst was successfully fabricated through a simple and rapid microwave-assisted polyol route (ethylene glycol was used as a reducing agent). In comparison with a conventional 20 wt % Pt/C electrocatalyst, the as-prepared 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 electrocatalyst resulted in much lower onset potential, higher I f / I b value, and superior stability toward EOR, which can be ascribed to the synergistic effect between Pt nanocatalyst and the Ti 0.8 W 0.2 O 2 catalyst support. Therefore, these findings imply that 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 is a promising anodic electrocatalyst and possesses the ability to replace Pt/C electrocatalysts in the future.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1589-1599
·
IF 1.637
Zhao Peng,Zhang Jinteng,Jiang Jingjing,Wang Hongtao,Xie Tengfeng,Lin Yanhong
A novel Pt/CeO 2 /ZnO ternary composite is synthesized via two simple procedures of hydrothermal and photoreduction. The crystal structure, morphology, and composition of as-prepared samples are characterized by XRD, SEM, HRTEM, XPS and UV–Vis DRS. Because both ZnO and CeO 2 are good photocatalytic semiconductors, photocatalytic activities of the samples are evaluated by the degradation of phenol aqueous solution (25 mg/L). Under the strong interaction among the Pt, CeO 2 and ZnO, the maximum photocatalytic activity is observed in the Pt/CeO 2 /ZnO ternary composites and 91% phenol can be degraded in 60 min under UV light irradiation. The probable photocatalytic mechanism is discussed by active species trapping experiments along with SPV, TPV, PL and PA measurements. The enhanced photocatalytic activity is attributed to the redox cycle of Ce 4+ ↔ Ce 3+ , the effective interface between ZnO and CeO 2 as well as the electron transfer action of Pt nanoparticles. The photocatalytic activity almost unchanged after four cycles and proves excellent reusable photocatalysts. This work shows the synergistic effect of rare earth elements and noble metals in the photocatalytic process, which facilitates their practical application in toxic pollution abatement.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Weixuan Zeng,Yuan Bian,Sheng Cao,Anquan Zhu,Lulu Qiao,Yongjin Ma,Pengfei Tan,Quanyin Ma,Rui Dong,Jun Pan
Visible light-driven photocatalytic hydrogen production has been deemed a potential means to solve the increasingly serious energy shortage problem. Herein, two dimensional (2D) Sr 2 Ta 2 O 7 /S-doped g-C 3 N 4 nanocomposites that applied in photocatalytic water reduction were fabricated through thermal condensation of thiourea with hydrothermal-prepared Sr 2 Ta 2 O 7 . The resulted Sr 2 Ta 2 O 7 /S-doped g-C 3 N 4 nanocomposite exhibited enhanced hydrogen evolution rate (11.36 μmol g −1 h −1 ) under visible light irradiation, which is about 3.5 times higher than that of pure S-doped g-C 3 N 4 . In light of the UV–vis diffuse reflectance spectroscopy, Mott-Schottky curve and photoluminescence spectra, the enhanced photocatalytic performance could be mainly attributed to the conduction band difference between Sr 2 Ta 2 O 7 and S-doped g-C 3 N 4 . In addition, transient photoluminescence spectra, electrochemical impedance spectra and photocurrent responses proved that the presence of Pt cocatalyst also plays an important role in facilitates the transport of photoexcited electron-hole pairs, subsequently promoting the photocatalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
Fuel Cells
·
2019
·Vol. 19
·期 2
·169-176
·
IF 2.33
T. Fu,S. Zhang,J. Huang,D. Cai,J. Li,J. Zhao
Ag-Pt alloy material is one of the most potential candidates to improve the catalytic activity of Pt-based catalyst toward the oxygen reduction reaction (ORR), which can reduce the dosage of the high-cost metal Pt used in the cathode of fuel cells. But it is hard to synthesis Ag-Pt alloy with nanosize in an easy and cheap way. In this study, the Ag-Pt alloy nanoparticles supported on carbon (Ag-Pt/C) with different Ag at.% were prepared by a facile one-pot approach with low costs. The XRD, TEM and XPS measurements were applied to verify the alloy structure of Ag-Pt nanoparticles. These Ag-Pt/C samples showed enhanced mass activities and catalytic stabilities for the ORR, which was up to two times higher than that of the commercial Pt/C catalyst at 0.9 V ( vs. reversible hydrogen electrode). Furthermore, the membrane electrode assembly (MEA) made from the Ag-Pt/C catalyst also showed a higher power density in H 2 -O 2 fuel cell test compared to the MEA made from the commercial Pt catalyst. These enhancements are attributed to the higher utilization of Pt and the regulated oxygen adsorption energy of Pt in the surface, which was confirmed using the density function theory calculation.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2019
·Vol. 2019
·期 24
·2933-2939
·
IF 2.578
Xuefeng Hu,Zeshu Zhang,Yibo Zhang,Liwei Sun,Heyuan Tian,Xiangguang Yang
Graphical A Pt/Co 3 O 4 catalyst was prepared by the galvanic displacement method, which exhibited excellent catalytic activity for toluene combustion (T 90 = 150 °C at GHSV = 60 000 mL g –1 h – 1 ) and outstanding stability reflected in a continuous 100 h on-stream toluene combustion lifetime experiment without loss in catalytic activity. Catalytic combustion has become one of the most economical, feasible and effective tools for the abatement of VOCs. However, it is difficult to prepare supported Pt catalysts possessing both excellent catalytic activity and stability by traditional preparation methods, such as incipient-wetness impregnation method and nanoparticle loading method. In this work, we prepared Pt/Co 3 O 4 catalyst with high catalytic activity and stability for the catalytic combustion of toluene by galvanic displacement method. As comparing, additional reference samples were prepared using incipient-wetness impregnation method and nanoparticle loading method, respectively. All of the samples were characterized by XRD, TEM, H 2 -TPR, O 2 -TPD and XPS techniques. The catalyst prepared by galvanic displacement method exhibited the best catalytic activity with the temperature of 90 % toluene conversion about 150 °C (T 90 = 150 °C) and outstanding stability reflected in a continuous 100 h on-stream toluene combustion lifetime experiment without catalytic activity decline at the GHSV = 60 000 mL g –1 h –1 compared to which prepared by traditional methods. These results are attributed to the excellent oxygen mobility, the high surface chemisorbed oxygen species concentration and the strong interaction between Pt and support Co 3 O 4 . Therefore, our work provided a universal strategy for designing high-efficiency and stable catalyst for the abatement of VOCs at low temperature.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yongkang Liu,Bin Hu,Shide Wu,Minghua Wang,Zhihong Zhang,Bingbing Cui,Linghao He,Miao Du
We have explored a nanocomposite composed of a bimetallic CoNi-zeolitic imidazole framework embedded by MoS 2 nanosheets (MoS 2 @CoNi-ZIF), as a bifunctional electrocatalyst for non-Pt methanol oxidation reaction (MOR) and overall water splitting in an alkaline solution. The series of MoS 2 @CoNi-ZIF nanocomposites exhibit different catalytic activities. Significantly, the MoS 2 @CoNi-ZIF nanosheet with a ratio of MoS 2 :CoNi-ZIF = 3:1 (MoS 2 @CoNi-ZIF(3-1)) shows the excellent electrocatalytic activity for MOR, affording an oxidation potential at 1.6 V, also with high catalytic current density and durability. Moreover, the MoS 2 @CoNi-ZIF(3-1) nanocomposite shows a superior electrocatalytic performance toward HER and OER. When the MoS 2 @CoNi-ZIF(3-1) was applied as the bifunctional catalyst for both the anode and cathode, the voltage applied to a two-electrode cell is 1.55 V to achieve a current density of 10 mA cm −2 for overall water splitting. This work provides a promising electrocatalyst for developing high-performance non-Pt-based clean energy and fuel cells in alkaline solution.
✓ 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）