INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Kai Yuan,Yiqing Zeng,Jinxin Gan,Zhaoxiang Zhong,Weihong Xing
Catalytic membranes can achieve the simultaneous purification of particulate matter (PM) and gaseous pollutants, and their performance depends on the design of a catalyst and its combination with a membrane material. Herein, a novel Pt@CNTs/SiC catalytic membrane composed of a Pt@CNTs (carbon nanotubes) membrane layer and a porous SiC support was developed for the simultaneous removal of formaldehyde and PM at room temperature. The CNT membrane layer underwent vertically integrated growth on a porous SiC support, which provided the catalytic membrane with a pore size of 7.4 μm and a high gas permeance of 240.2 m3·m–2·h–1·kPa–1. The loading of Pt particles on CNTs slightly decreased the gas permeance of the catalytic membrane (219.9 m3·m–2·h–1·kPa–1) but endowed the membrane with catalytic formaldehyde degradation performance. The obtained Pt@CNTs/SiC catalytic membrane with a 240 μm thick CNT layer and 0.8% Pt loading exhibited 99.999% filtration efficiency for 300 nm SiO2 (face velocity = 1 m/min) and 72.1% formaldehyde degradation (gas flow = 49 mL/min), implying that the Pt@CNTs/SiC membrane has good application potential in the collaborative removal of various air pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 18
·3953-3959
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IF 5.686
Zhiming Zhou,Hongyan Jia,Yong Guo,Yangang Wang,Xiaohui Liu,Qineng Xia,Xi Li,Yanqin Wang
Graphical Sulfates : The introduction of sulfates into TiO 2 supported Pt-WO x catalyst greatly improves the dispersion of Pt and WOx species, increases the acid amount and inhibits the leaching of Pt and WO x species, resulting in dramatically promoted catalytic activity and stability for glycerol hydrogenolysis to 1,3-PDO and n-PO with 93 % total yield. Pt-WO x based catalysts were widely investigated and showed high industrial application potential for glycerol hydrogenolysis. Further improving the catalytic activity and stability of the Pt-WO x based catalysts is important. Herein, we modified the TiO 2 supported Pt-WO x catalyst with sulfate doping and employed for the glycerol hydrogenolysis. The introduction of sulfates dramatically promoted the catalytic activity and stability of the Pt/W/Ti catalyst in glycerol hydrogenolysis. Sulfates-doped Pt/W−S/Ti achieved 100 % conversion of glycerol, with 36 % selectivity to 1,3-PDO and 57 % selectivity to n-PO at 120 °C and 4 MPa, while the conversion over Pt/W/Ti only reached 57 %. Moreover, Pt/W−S/Ti offered 22.5 times more glycerol conversion (90 %) than Pt/W/Ti (4 %) for the second run. The much higher activity of the Pt/W−S/Ti was ascribed to the better dispersion of Pt and WO x species and more Brønsted acid amount. The enhanced stability of Pt/W−S/Ti was attributed to its strong anti-leaching ability after sulfate doping.
研究领域:
催化化学
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工业化学
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材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2019
·
IF 3.674
Feng Wang,GuoQin Qi,ChuanQi Zhang,HeCheng Ren,Hua Ma,Yu Guo
A series of Na-doped Pt/Al 2 O 3 catalysts with 0.2 wt% of Pt loading and 0–6 wt% Na loading was prepared to investigate the HCHO complete oxidation at room temperature. Powder XRD, BET and XPS were used to characterize the bulk structure and texture of catalysts, as well as the ratio of hydroxyl oxygen to lattice oxygen. A long-term catalyst stability test (50 h on reaction stream) was conducted under severe conditions of a large space velocity of 180,000 mL/h/g, a high HCHO concentration of 80 ppm and dry conditions (relative humidity of 0%). An appropriate amount of doped-Na (2 wt%) contributed to a remarkable improvement of activity and stability of the Na-doped 0.2 wt% Pt/Al 2 O 3 catalyst.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 16
·3903-3912
·
IF 4.495
Nian Lei,Xiaochen Zhao,Baolin Hou,Man Yang,Maoxiang Zhou,Fei Liu,Aiqin Wang,Tao Zhang
Graphical Pt at it, again ! The highest 1,3-PDO yield was obtained over the Pt/WO x /Al 2 O 3 catalyst with a medium domain size of WO x and a Pt/W atomic ratio of 1/4∼1/2, which favored the dispersion of Pt and maximized the number of Pt−WO x interface sites, and consequently promoted the in-situ production of strong Brønsted acid sites. Selective cleavage of secondary C−O bond is an important yet challenging strategy in glycerol valorization, and the product 1,3-propanediol (1,3-PDO) is of great value in polyester industry. Herein, we report a series of Pt/WO x /Al 2 O 3 catalysts for selective hydrogenolysis of glycerol in a fixed-bed reactor and obtain the highest space-time yield of 1,3-PDO (191.7*10 −3 g 1,3-PDO h −1 g −1 cat. ) to date. Both Pt and W have substantial effects on the 1,3-PDO yield with the optimum Pt/W atomic ratio of 1/2∼1/4. Spectroscopy characterizations as well as chemisorption experiments reveal that at the medium domain size of WO x , hydrogen spillover can take place to the greatest extent due to the improved dispersion of Pt and the suitable reducibility of WO x . Dehydration/dehydrogenation tests of 2-butanol suggest that strong Brønsted acid sites are created via hydrogen dissociation at the Pt−WO x interface and spillover to the neighboring oxygen atom. Such in situ formed protons are critical to the selective cleavage of secondary C−O bonds of polyols.
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
ACS Catalysis
·
2019
·
IF 12.221
Didi Li,Yi Li,Xiaohui Liu,Yong Guo,Chih-Wen Pao,Jeng-Lung Chen,Yongfeng Hu,Yanqin Wang
The production of hydrogen from the aqueous-phase reforming (APR) of oxygenated hydrocarbons is promising. Herein, the performances of Pt loaded on NiAl2O4 spinel and γ-Al2O3 were investigated in the APR of methanol. The conversion of methanol and the yield of hydrogen over Pt/NiAl2O4 reached 99.9% and 95.7%, respectively. In comparison with Pt/γ-Al2O3 catalyst (26.5% and 23.3%, respectively), these values were enhanced by 4-fold. More importantly, Pt/NiAl2O4 had high stability with only 10% loss of its initial conversion after 600 h on stream. In situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) of the APR of methanol revealed that the reaction underwent the dehydrogenation of methanol and the sequential water–gas shift (WGS) reaction. These two reactions were then investigated independently, in which Pt/NiAl2O4 showed more efficient performance than Pt/γ-Al2O3. Intensive characterization methods revealed that the chemical state of Pt played a pivotal role in the dehydrogenation of methanol to generate the adsorbed CO intermediate. For Pt/NiAl2O4 catalyst, the reduction of PtOx to metallic state Pt was easier because of the presence of the oxygen vacancy, leading to the higher catalytic performance in the dehydrogenation of methanol. Further studies with in situ DRIFTS-MS of WGS demonstrated a redox mechanism over Pt/NiAl2O4 catalyst, which was different from the associative route that occurred over Pt/γ-Al2O3 and made the WGS reaction faster. The addition of Ni (NiAl2O4 spinel) creates oxygen vacancies, giving WGS which underwent a redox route. This work presents the deep understanding into the pathway and mechanism in the APR of methanol and is expected to have important implications for the future development of APR catalysts.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Liang-Liang Wu,Li-Ying Wang,Zheng-Jun Xie,Na Pan,Chi-Fang Peng
This paper reported that the peroxidase-like activity of DNA-Ag/Pt nanoclusters (NCs) can be inhibited significantly by l -cysteine. Based on this finding, a highly sensitive and selective colorimetric detection for l -cysteine was developed with a detection limit (LOD) of 2.0 nM and a linear range from 5.0 nM to 500 nM. This detection for l -cysteine was highly selectivity over other amino acids . The high sensitivity and selectivity of this method facilitated the detection of l -cysteine in biological samples. Moreover, this method developed here was low-cost and simple. These results indicated the excellent analytical application of Ag/Pt NCs as enzyme mimic .
研究领域:
生物化学
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分析化学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2020
·Vol. 36
·期 9
·1045-1051
·
IF 2.049
Ze WANG,Bin DONG,Xiaoqian CUI,Qian FAN,Yanfu HUAN,Hongyan SHAN,Guodong FENG,Qiang FEI
In this study, core-shell Au@Pt nanoparticles (Au@Pt NPs) with peroxidase catalytic activity were synthesized by the seed-mediated method, and were used to catalyze the reaction of luminol–H2O2 to enhance the chemiluminescence (CL) intensity. It was found that thiocyanate (SCN−) can effectively inhibit the catalytic activity of Au@Pt NPs. Based on this phenomenon, a method to detect SCN− by using the Au@Pt NPs-catalytic luminol–H2O2 CL system was established, which has an ultra-low detection limit and an ultra-wide linear range, as well as the advantages of being simple and having low-cost and convenient operation. The research mechanism indicated that SCN− could be adsorbed on the surface of Au@Pt NPs and occupies the active sites of Pt nanostructures, which led to a decrease in the amount of Pt0 and a loss of the excellent catalytic activity of Au@Pt NPs. After optimizing the experimental conditions, this assay for detecting SCN− exhibited a good linear range from 5 to 180 nM, and the low detection limit was 2.9 nM. In addition, this approach has been successfully applied to the detection of SCN− in tap-water samples, which has practical application value and embodies good development prospects.
研究领域:
分析化学
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纳米技术
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生物传感
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Shenghao Zhao,Zhijiao Ji,Lu Hao,Zhangyou Wang,Jiawen Li,Fangge Cheng,Mansor Hussain,Jia Liu
Achieving high-efficiency electrooxidation of methanol (MOR) under low alkalinity is critical for the industrial application of direct methanol fuel cells. This challenge can be addressed by modulating the electron density of nanosized Pt particles via the support’s exchange effect. Herein, an electron-enriched Pt catalyst (Pt/Mn3O4) was successfully synthesized through the structural tuning of MnO2. The Pt/Mn3O4 catalyst exhibits a superior performance, delivering a mass activity of 1150 mA mgPt–1 in 0.1 M KOH with 4 M methanol, significantly outperforming commercial Pt/C (446 mA mgPt–1). The transfer of electrons from Mn3O4 to Pt was confirmed through X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and magnetic hysteresis loop analysis. Experimental and computational studies elucidate the nucleation mechanism of electron-enriched Pt, the source of active species (Pt–OH) for methanol oxidation, and the role of high-valence Mn. Furthermore, the spontaneous methanol decomposition on Pt/Mn3O4 and the corresponding active sites of dehydrogenation and CO oxidation were identified. Interference-free experiments revealed the deactivation mechanism of Pt/Mn3O4, underscoring the pivotal role of CO32– in the alkaline MOR.
研究领域:
材料科学
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电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Mingzhen Huang,Jinxin He,Kaiji Xu,Dongren Cai,Guowu Zhan
The supported Pt/CeO 2 catalysts are widely used for the catalytic oxidation of CO at ambient conditions. Herein, we reported a new strategy for modifying the interaction between Pt and CeO 2 support via pulsed steam treatment, which significantly optimized the catalytic performance of Pt/CeO 2 for CO oxidation. Specifically, the hollow CeO 2 nanospheres were prepared by using carbon spheres as sacrificial templates and then subjected to pulsed steam treatment at 150 °C for different times to obtain the CeO 2 -xH support (x means the time of pulsed steam treatment, min). It was found that the complete oxidation of CO can be achieved at 90 °C over the Pt/CeO 2 –50H sample, which was much lower than that (130 °C) on Pt/CeO 2 without pulsed steam treatment. The XPS and in-situ DRIFTS characterizations were conducted to reveal the high performance of the Pt/CeO 2 –50H catalyst for CO oxidation. It was found that the valence state of Pt significantly controlled by pulsed steam treatment was critical to the catalytic activity, whereby the presence of two types of active sites (Pt 0 -CO and Pt δ+ -CO) over Pt/CeO 2 –50H greatly promoted the combination of adsorbed CO and O 2 to generate CO 2 . Accordingly, this study provides a facile method to regulate the Pt valence state by pulsed steam treatment for CeO 2 support, which is critical to the CO oxidation activity.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiao Zhang,Qianhui Wei,Hongbin Zhao,Feng Wei,Tengfei Li
Hydrogen sulfide (H 2 S) is considered to be the third endogenous gas messenger after nitric oxide and carbon monoxide , and is closely related to physiological and pathological functions of human being. Rapid and real-time monitoring of endogenous H 2 S production in living cells is of great significance for clinical diagnoses of related disease and in-depth investigation of pathological processes. The application of electrochemical sensors has become a promising method to achieve real-time H 2 S monitoring comparing to other methods. Up to now, low-cost, and highly sensitive electrocatalysts for H 2 S detection are conspicuously scarce. Herein, we developed a high-efficient method to construct a H 2 S electrochemical sensor, which configure dissolved–H 2 S–sensitive electrochemical sensor using porous Pt-modified copper oxide (Pt–CuO) as electrocatalyst. The obtained sensor possessed remarkable H 2 S detection performance, achieving the detection limit of 0.5 ppm and apparent selectivity toward various gases (e.g., ammonia, nitrogen dioxide , and carbon dioxide). The electrochemical sensor was also applied for monitoring H 2 S released from mesenchymal stem cells. The enhanced sensing performance was attributed to: (1) electrocatalytic reaction between CuO and [H 2 S] (H 2 S and HS − ) was observed in the cyclic voltammetry curves with oxidation current peaks; (2) Pt catalytic activity promoted electron transfer during the detection process and further decreasing Pt–CuO resistance; and (3) enhanced diffusion of detection molecules/ions, which increased the reactivity sites through forming cross porous structures using sodium carbonate as sacrifice template. The proposed Pt–CuO-based electrochemical sensor shows great potential for applications in clinical diagnoses, and provides effective means to understand the role of H 2 S in biological processes.
研究领域:
生物医学工程
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分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2018
·
IF 3.584
Jie Zhang,Lei Wang,Chuang Li,Shaohua Jin,Changhai Liang
Direct selective hydrogenolysis of dibenzofuran (DBF) derived from coal and shale oil to a value-added chemical, ortho-phenylphenol (OPP), with high selectivity (80%) and yield (48%) has been achieved over Pt/MgO at 400 °C and 1.0 MPa by controlling the C–O bond cleavage as well as minimizing the extent of hydrogenation of aromatic rings. Meanwhile, Pt/SiO2, Pt/Al2O3, and Pt/MgO/Al2O3 catalysts were used for the DBF hydrogenolysis and showed lower selectivity for OPP. The influence of reaction parameters has been studied to unveil the optimal reaction conditions. And the phenomenon of OPP dehydrogenation is found over various catalysts for the hydrogenation reaction of OPP. Extensive reactions and catalyst characterizations demonstrated that the OPP selectivity and the dehydrogenation of OPP to DBF follows the order of supports basicity: MgO-900 > MgO > SiO2 > MgO/Al2O3 > Al2O3, which shows that the acid–base properties of supports impact the adsorption and desorption behaviors of DBF and OPP, and results in the disparity of OPP selectivity and the dehydrogenation of OPP. Finally, a plausible reaction pathway and mechanistic understanding are proposed.
研究领域:
催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Dan Liu,Ismail Nadia,Chaohe Fang,Kuan He,Binghui Ge,Hailong Chen,Zhuo Chen
Hydrogenation of nitroaromatics to the corresponding amines plays a central role in the drug, fine chemical, and petrochemical industry. However, realizing hydrogenation through highly effective and environment-friendly methods remains a significant challenge. Here we demonstrated photo-enhanced catalytic activity for hydrogenation of nitrobenzene using Pt-Au/TiO 2 heterojunction as catalyst and hydrogen as reducing agent. The catalytic reaction rate improved 6.5 times under the simulated sunlight compared to the counterpart without light irradiation, and the TOF value of the catalytic reaction achieved as high as 7315 h −1 under light irradiation, better than the previously reported results. Further mechanism investigations indicate that light illumination can promote the activation of hydrogen and nitrobenzene molecules so that the catalytic performance improves significantly. This finding not only develops a green approach for the hydrogenation of nitroaromatics but also opens an avenue for designing high-efficiency photocatalysts.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 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）