APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Ling Zhang,Long Chen,Yaobin Li,Yuexin Peng,Fang Chen,Liang Wang,Changbin Zhang,Xiangju Meng,Hong He,Feng-Shou Xiao
For human health and environmental protection, removal of formaldehyde (HCHO) has become a hot topic, and completely catalytic oxidation at room temperature has been identified as one of the efficient routes for solving this problem. Recently, it has been reported that zeolite-supported Pt catalysts are active for HCHO oxidation at low temperatures, but they are still unable to completely oxidize HCHO at room temperature. To enhance the activity, it has been suggested to increase the Pt dispersion and acidic density in the zeolite-supported Pt catalysts. We therefore chose Al-rich Beta as a zeolite support because abundant aluminum species in the zeolite framework are advantageous for increasing acidic density through ion-exchange of protons and for improving Pt metal dispersion through the metal-zeolite interaction by increasing the negative charge of the zeolite framework with positively charged metal ions. As we expected, the Al-rich Beta zeolite supported platinum catalyst is very active, giving complete oxidation of HCHO at room temperature. To the best of our knowledge, this is the first time the complete oxidation of HCHO at room temperature over a zeolite-supported noble metal catalyst has been realized. In addition to its extraordinary activity, this catalyst is also very stable and selective. The strategy of designing zeolite-supported noble metal catalysts might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Chen Zhang,Tao Wang,Xiao Liu,Yunjie Ding
A series of copper-promoted platinum supported on activated carbon (Cu-Pt/AC) catalysts were investigated for glycerol oxidation to lactic acid. The catalytic performance of 1.0%Pt/AC catalyst was greatly influenced by Cu loading (0.1–2.0 wt%). Among them, the 0.5%Cu–1.0%Pt/AC catalyst showed the best promotional effect, whose lactic acid yield was 2.4 times of that on 1.0%Pt/AC under same reaction conditions. Characterizations were carried out to explore the relationships between catalyst properties and reaction performances. TEM images show that the introduction of Cu improves the dispersion of Pt and Cu, and some Pt-Cu interfaces are detected by HR-TEM, which would facilitate the glycerol transformation. XPS and H 2 -TPR analyses reveal that good catalyst performance is related with not only a proper surface Pt/Cu molar ratio, but also copper species’ oxidation states. Cu + and Cu 0 species favor glycerol conversion and lactic acid production, whereas large CuO particles facilitate the formation of glyceric acid.
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 1
·676-684
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IF 2.76
Tu Baosheng,Shi Nian,Sun Wei,Cao Limei,Yang Ji
In this paper, Pt supports on carbon black powder (Vulcan XC-72) were synthesized via a hydrothermal method for selective catalytic reduction (SCR) of NO with H 2 in the presence of 2 vol% O 2 over a wide temperature of 20–300 °C. The results showed that the 3 and 5 wt% Pt/C catalysts resulted in high NO conversion (>90 %) over a temperature range of 120 to 300 °C, and the maximum NO conversion of 98.6 % was achieved over 5 wt% Pt/C at 120 °C. Meanwhile, the influence of SO 2 and H 2 O on the catalyst performance of 3 wt% Pt/C was investigated. The catalysts exhibited good SO 2 poisoning resistance when the SO 2 concentration was lower than 260 ppm. Moreover, a positive effect on NO conversion was detected with the addition of 3 and 5 vol% H 2 O in the feed gas stream.
TEM image and good NO conversion performance of the Pt/C catalysts
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Junbo Zhang,Xiaolin Li,Ming Xu,Yusen Yang,Yinwen Li,Ning Liu,Xiaoyu Meng,Lifang Chen,Shuxian Shi,Min Wei
Glycerol (GLY) aerobic oxidation in an aqueous solution is one of the most prospective pathways in biomass transformation, where the supported catalysts based on noble metals (mainly Au, Pd, Pt) are most commonly employed. Herein, Pt nanoparticles supported on rehydrated Mg x Al 1 -hydrotalcite (denoted as re-Mg x Al 1 -LDH-Pt) were prepared via impregnation-reduction method followed by an in situ rehydration process, which showed high activity and selectivity towards GLY oxidation to produce glyceric acid (GLYA) at room temperature. The metal-support interfacial structure and catalyst basicity were modulated by changing the Mg/Al molar ratio of the hydrotalcite precursor, and the optimal performance was achieved on re-Mg 6 Al 1 -LDH-Pt with a GLY conversion of 87.6% and a GLYA yield of 58.6%, which exceeded the traditional activated carbon and oxide supports. A combinative study on structural characterizations (XANES, CO-FTIR spectra, and benzoic acid titration) proves that a higher Mg/Al molar ratio promotes the formation of positively charged Pt δ + species at metal-support interface, which accelerates bond cleavage of α-C–H and improves catalytic activity. Moreover, a higher Mg/Al molar ratio provides a stronger basicity of support that contributes to the oxidation of terminal-hydroxyl and thus enhances the selectivity of GLYA. This catalyst with tunable metal-support interaction shows prospective applications toward transformation of biomass-based polyols.
研究领域:
化学工程
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催化科学
·
生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Jing Lin,Taojin Wang,Jiali Zhou,Xiaodong Wu,Ziran Ma,Shuang Liu
In order to find out the reasons behind the steam-accelerated C 3 H 6 combustion over supported platinum, a Pt@TiO x /TiO 2 catalyst modified by silica (Pt@TiSi) with “super-hydrophilic” surface and metallic platinum sites was synthesized in the present study. In situ spectroscopy analyses excluded the structural change of platinum during reactions, suggesting water has to be involved chemically to accelerate the reactions. By comparing the water response and kinetics of the silica-modified and unmodified samples, a water-mediated O 2 adsorption and activation pathway (HOH···OO* → OOH*) was identified as the origin of the activity bonus induced by steam. Since OOH* formed readily at the interface between platinum and the hydrophilic supports (e.g., TiO x -SiO 2 ), Pt@TiSi exhibited drastically enhanced C 3 H 6 oxidation activity in the presence of moisture. Collectively, this work provides an extensible example about how to fabricate efficient catalysts for reactions with positive H 2 O rate orders, and how to unveil the water effects behind them.
研究领域:
催化化学
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yufei Hu,Jiashou Lv,Danqin Li,Meisi Yu,Wenjing Zhou,Furui Lin,Weiqiang Zhou,Jie Li,Caiqin Wang,Jingkun Xu
To facilitate the commercialization of methanol fuel cells, the development of catalysts that exhibit both high activity and durability is of paramount importance. Nevertheless, the widespread application of current Pt-based catalysts is limited by their high cost and susceptibility to CO poisoning, among other drawbacks. Research has shown that introducing suitable support materials can enhance their anti-poisoning, making support development a key focus. In this research, we suggest a new strategy based on the template method to successfully synthesize oxygen vacancies neodymium-doped TiO 2 hollow spheres (OV-Nd-THS). The platinum nanoparticles (Pt NPs) were successfully loaded onto the OV-Nd-THS support to form the OV-Nd-THS/Pt nanocomposite. This innovative nanocomposite serves as a highly efficient catalyst, converting solar energy and chemical energy into electrical energy. The results indicated that the catalyst exhibited an electrocatalytic performance of 2686 mA mg −1 under alkaline conditions, which significantly increased to 5252 mA mg −1 under illumination. After 400 cycle tests, the mass activity maintained approximately 62 % of its highest value, demonstrating excellent durability. This remarkable performance is attributed to Nd doping, which introduces abundant oxygen vacancies, facilitating oxygen adsorption and consequently generating more active sites. The separation efficacy of photogenerated carriers is improved by the presence of surface oxygen vacancies, which in turn improves photoelectrocatalytic performance. Moreover, the hollow structure of titanium dioxide enhances light-harvesting capabilities, thereby promoting charge separation efficiency and facilitating the kinetics of the methanol oxidation reaction. This study presents a novel approach and establishes a significant experimental foundation for the development of high-performance catalysts for direct methanol fuel cells.
研究领域:
材料科学
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能源化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Zhang Cao,Jiahao Bu,Zeqin Zhong,Changyong Sun,Qingsong Zhang,Jiandian Wang,Shihong Chen,Xiaowei Xie
BN-supported Pt catalysts were prepared by an impregnation method using Pt(NH 3 ) 4 (NO 3 ) 2 as metal precursors and tested in the liquid-phase selective hydrogenation of cinnamaldehyde. It was found that the Pt/BN catalyst exhibited a high performance for the selective C O hydrogenation at room temperature. A selectivity of over 85% towards cinnamyl alcohol at a cinnamaldehyde conversion of over 95% could be obtained. The effects of supports and Pt particle sizes were explored by N 2 physisorption , XRD, TEM, HRTEM, HAADF-STEM, TPD , H 2 -TPR, XPS, CO-DRIFTS, etc. The influences of solvents and operation conditions were investigated, and a simplified kinetics test was also carried out. The comparison of different supports suggested that BN with an inert surface and few acid-base sites possibly favors a simple adsorption mode of cinnamaldehyde dependent only on the supported Pt particles, resulting in a high selectivity to cinnamyl alcohol. While the abundant acid-base surface sites on the Pt/Al 2 O 3 or Pt/SiO 2 , possibly associated with the multiple adsorption modes of cinnamaldehyde, had an adverse effect on the selective C O hydrogenation. The investigation of Pt size effect showed that large Pt particles with few low coordinated Pt sites displayed a higher selectivity to cinnamyl alcohol than small Pt particles with more low coordinated Pt sites on the Pt/BN catalysts. It was also revealed that water is a suitable solvent, and the presence of water in a mixture solvent is crucial for achieving a high activity of the Pt/BN in cinnamaldehyde hydrogenation.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2016
·
IF 7.354
Xiaomei Ning,Yuhang Li,Hao Yu,Feng Peng,Hongjuan Wang,Yanhui Yang
The group 15 metals, bismuth and antimony, play important roles in promoting noble-metal-catalyzed oxidation reactions toward high value-added chemicals. Herein, we report that the selective oxidation of glycerol to 1,3-dihydroxyacetone (DHA) catalyzed by Pt supported on N-doped carbon nanotubes (Pt/NCNT) can be significantly promoted in the presence of Bi or Sb in reaction solution. This catalyst system showed not only comparable even better performance to the Pt/NCNT with pre-loaded Bi, but also the greatly simplified catalyst preparation. It was found that the Bi-promoted Pt/NCNT underwent dynamic surface reconstruction through leaching and adsorption of Bi adatoms, due to the formation of glyceric acid. By characterizing the adsorption of Bi on Pt catalyst with high-resolution transmission electron microscopy, CO-stripping, horizontal attenuated total reflection infrared spectroscopy and X-ray photoelectron spectroscopy, it has been ascertained that Bi preferentially deposits on the step sites of Pt, and then blocks the terrace sites to promote the Pt catalyst mainly through a geometrical effect, which facilitates the activation and transformation of the secondary hydroxyl group of glycerol through the chelation between substrate and Pt–Bi sites.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 4
·965-977
·
IF 2.936
Zhang Tong,Zhao HuaHua,Yang Jian,Zhao Jun,Yan Liang,Chou Lingjun,Song Huanling
Selective hydrogenation of crotonaldehyde to crotyl alcohol over PDA (polydopamine) modified Co 3 O 4 supported Pt catalysts was investigated in liquid phase. The catalysts which contain PDA and Co 3 O 4 lead to the formation of two kinds of interfaces: Pt-PDA and Pt-Co 3 O 4 , which greatly improves the performance in the hydrogenation of crotonaldehyde. TEM results reveal that the Pt nanoparticles of Pt/Co 3 O 4 @PDA have a smaller size and better dispersion than Pt/Co 3 O 4 . XPS, FT-IR and CO-DRIFTs results indicate that the addition of PDA decreases the electron density of Pt which is favor to the hydrogenation of C=O in crotonaldehyde. The characterization results demonstrate that the interaction between Pt and PDA creates new active interfacial sites and the synergy of Pt-PDA and Pt-Co 3 O 4 is responsible for the excellent performance. Graphical Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Caiqin Wang,Tingting Zhou,Cheng Qian,Lili Chen,Liyuan Hao,Shumeng Fu,Bingguo Feng,Xiaofei Yang
Ti 3 C 2 T x MXene nanonets (MNNs) with 3D fibrous architecture were obtained from Ti 3 C 2 T x MXene nanoplates (MNPs) via surface modifying of alkalization in concentrated KOH solution, which was further combined with carbon nanotube and used as catalyst supports for Pt nanoparticles. By controlling the treatment time of alkalization, the lamellar surface of MNPs was getting into fibration in different extent. The catalytic performances toward hydrogen evolution reaction (HER) of a series of Pt-loaded MNNs catalysts were investigated, in which 1 %Pt-MNNs-9 composite catalyst presented the best hydrogen evolution performance. In detail, 1 %Pt-MNNs-9 with 1 wt.% of Pt loading exhibits an overpotential of 60 mV at 10 mA·cm −2 , which is much lower than 1 % Pt-MNPs (274 mV). It also keeps stable performance for long term stability. The enhanced catalytic activity is probably due to the fact that, Ti 3 C 2 T x MNNs with 3D architecture not only possesses abundant sites to anchor Pt nanoaprticles, but also facilitates the mass and charge transfer, which are significantly beneficial to catalytic reaction. The 3D architecture MXene fibers are expected to have widespread applications including but not limited to energy storage/conversion, and catalytic fields.
研究领域:
材料科学
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催化化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 5
·1440
·
IF 2.8
Tongtong Zhang,Sijia Wang,Xingyuan Li,Yupeng Du,Jiajun Hu,Shi Jiang,Yu Guo
Room-temperature complete oxidation of formaldehyde (HCHO) is an important orientation of research programs, yet challenges remain. The development of efficient catalysts with high activity and excellent stability is of great significance for such practical application. Inspired by this whole catalytic process, we, therefore, chose HZSM-5 zeolite with abundant acidic sites as catalyst support and lactic acid (LA) as modifier to regulate the properties. The use of LA simultaneously enhances the hydroxyls density and increases the dispersion of Pt nanoparticles, which are better than the reference catalyst prepared via direct wetness impregnation method. Most satisfying of all, the lactic acid-modified HZSM-5-supported Pt catalyst demonstrates a remarkable reaction performance for room-temperature HCHO oxidation at a high concentration HCHO of 80 ppm and a large space velocity of 360,000 mL/g/h (especially with a low Pt loading of 0.5%). In addition, a 120 h test further confirms the favorable stability of the designed catalyst. This pre-modified strategy using organic acid might provide potential approach in the construction of efficient zeolite-supported catalysts.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Zhengyan Zhang,Zhi Teng,Xingwei Li
A good support is essential for the activity and durability of the supported catalysts. In this work, nitrogen-doped carbon with fluffy structure and high content of pyridinic-N and pyrrolic-N is prepared by the pyrolysis of polyaniline/ITO composite, which is conducive to uniform and firm loading of Pt catalysts. Herein, polyaniline is used as carbon and nitrogen sources, and ITO is used as a pyrolysis auxiliary due to the reaction of polyaniline dopant (proton acid) and ITO during the pyrolysis. Pt catalyst supported on above optimal support shows an excellent electrocatalytic performance for the methanol oxidation reaction, especially its stability, achieving an activity retention rate of 89.3% after 1000 cycles of cyclic voltammetry in 0.5 M H 2 SO 4 and 0.5 M CH 3 OH solution. This work provides a new strategy for preparing Pt-based catalyst with a high activity and a good durability.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 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）