Molecular Catalysis
·
2024
·
IF 3.9
Xingling Zhao,Xue Zhou,Wanyan Xing,Zhimin Yuan,Kaili Wang,Qihang Zhang,Yulong Shan,Jiani Liu,Lin Ju,Zaiyong Jiang,Hong He
CO is a ubiquitous air pollutant, frequently encountered in the fields of automotive exhaust purification, especial in the cold-start-emission stage. Pt based catalysts are widely used to purify CO into CO 2 owing to their exceptional performance. But they can be few excited to exhibit reasonable catalytic activity due to the low temperature at the cold-start-emission stage. In exhaust gas purification catalysts used by fossil fuel-based vehicles, Al 2 O 3 is used frequently. But there are rarely reports of Pt loaded Al 2 O 3 catalysts achieving feasible activity of CO oxidation at room temperature. Herein, we prepared Cu x Pt y alloy/Al 2 O 3 catalysts (with high penta-coordinated Al 3+ (Al V )), Al V centers as binding sites for Cu 3 Pt 1 alloys on Al 2 O 3 enable the high dispersion and stability of Cu 3 Pt 1 alloy. The adsorption capacity of O 2 and CO molecules on Cu 3 Pt 1 surface are stronger than the case on Pt surface, which may make O 2 and CO molecules more easily activated, making the CO oxidation reaction easier. In addition, the desorption of CO 2 from Cu x Pt y surface is easier compared to that on Pt surface, increasing the frequency of use of active sites there. Therefore, this Cu 3 Pt 1 /Al 2 O 3 catalyst exhibits 100 % conversion of CO with a GHSV of 6×10 3 mL·g −1 cat ·h −1 at room temperature. This work provides a feasible guideline for the design and synthesis of Pt loaded Al 2 O 3 catalysts toward room temperature CO oxidation.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 31
·期 12
·e3889
·
IF 2.319
Tao Feng,Ranxiao Tang,Ningzhao Shang,Cheng Feng,Shutao Gao,Chun Wang
A facile and efficient method for facilitating hydrogen generation from formaldehyde aqueous solution was developed using Pd nanoparticles supported on CeO 2 (Pd/CeO 2 ) as the catalyst. The prepared Pd/CeO 2 catalyst exhibited 100% H 2 selectivity and excellent catalytic activity for formaldehyde dehydrogenation with the initial rate of 2089 ml min −1 g Pd −1 at room temperature and atmospheric pressure without any extra additive. The prepared catalyst was stable and reusable, and its catalytic activity kept almost unchanged after it was reused for the fifth run. Therefore, it is considered that this Pd/CeO 2 based hydrogen generation system may serve as an alternative hydrogen supply candidate for practical application.
研究领域:
化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jialing Shen,Guojun Lv,Juan Deng,Shihao Su,Fuxin Wang,Shengnan Xu,Lachgar Oussama,Zhongmin Liu
UiO-66 materials have the benefit of excellent stability, porosity, huge surface area, and presence of flaws, hence designing oxidative desulfurization (ODS) catalysts based on UiO-66 is very appealing. Herein, tungsten doped UiO-66 materials were synthesized with post-doping and in situ synthesis methods, and used as heterogeneous catalysts for the room-temperature oxidative desulfurization reactions. The successful doping of tungsten into the UiO-66 framework was demonstrated by FT-IR, UV–Vis, Raman and TGA characterizations. XAS characterization disclosed that tungsten element formed Zr-O-W bond on the defect sites for the tungsten doped UiO-66 materials. At the same time, the in situ synthesized W 2 @U-150 catalyst revealed the highest 98.5% of dibenzothiophene (DBT) elimination within 1h of desulfurization reaction as well as the biggest catalytic efficiency of 17727.3 h −1 mol −1 at room temperature due to its smallest band gap energy of 3.32 eV, highest tungsten content of 9.8 %, and most Lewis acid amount of 47.1 μmol/g. In addition, the synthesized W 2 @U-150 catalyst showed excellent re-usability for five cycles.
研究领域:
材料科学
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催化化学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jinwei Chen,Meng Huang,Wang Chen,Haiyan Tang,Yi Jiao,Jie Zhang,Gang Wang,Ruilin Wang
The inherent low activity at room temperature has greatly limited the utilization of Co3O4 in indoor air purification. In this work, an extremely facile and mild method utilizing the strong oxidation of H2O2 was designed to prepare a novel Co3O4-HP catalyst. The Co3O4-HP catalyst exhibits excellent removal activity for low-level concentration (∼1 ppm) of formaldehyde (HCHO) at room temperature. Under the static test mode, it shows 90.62% HCHO removal efficiency in 180 min at an RH of ∼55%. Under the dynamic test mode, it maintains the performance to remove approximately 97.26% of HCHO within 180 min under a GHSV of ∼90,000 mL·h–1·g–1. Additionally, the HCHO removal efficiency of Co3O4-HP is also maintained at around 94.76% under a higher GHSV of ∼150,000 mL·h–1·g–1. Such a satisfying activity is due to abundant oxygen vacancy defects bringing about a large number of surface reactive oxygen species and high redox capacity and oxygen migration capacity. It is also because of the synergistic effect of surface OH groups. This strategy will open an exciting avenue to design outstanding catalysts for HCHO removal by defect engineering and the synergistic effect.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Jingyu Qian,Jing Mo,Yukang Zhou,Mengjie Fan,Yingwen Chen,Jining Liu,Yuan Xu,Shubao Shen
Catalytic oxidation at room temperature is a promising alternative approach for indoor formaldehyde elimination. However, the development of non-precious metal room temperature catalysts is still highly challenging. In this study, manganese-cerium composite oxides (MC) were developed and optimized. The removal performance of low concentrations of formaldehyde at room temperature was comprehensively evaluated. Formaldehyde removal was achieved with MC under dark at a level comparable to that of the commercial P25 catalyst. The removal efficiency of 90.9% in 24 h at room temperature was obtained for the initial formaldehyde concentration of 1.2 ± 0.1 ppm. Using electron paramagnetic resonance spectroscopy , free radicals were confirmed to play a key role in formaldehyde degradation on MC. Formate was detected as the main intermediate product by in situ DRIFTs, and the mechanism of MC catalytic oxidation at room temperature was deduced.
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
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiao-Xiao Xing,Hui-Li Guo,Tong Feng,Tian-Meng He,Wen-Shuai Zhu,Hua-Ming Li,Jing-Yu Pang,Yan Bai,Dong-Bin Dang
Achieving long-term stable deep desulfurization at room temperature and recovering high value-added sulfone products is a challenge at present. Herein, a series of catalysts [Cnmim]5VW12O40Br (CnVW12, 1-alkyl-3-methylimidazolium bromide tungstovanadate, n = 4, 8, 16) were presented for the room temperature catalytic oxidation of dibenzothiophene (DBT) and its derivatives. Factors affecting the reaction process, such as the amount of catalyst, oxidant, and temperature, were systematically discussed. C16VW12 showed higher catalytic performance, and 100% conversion and selectivity could be achieved in 50 min with only 10 mg. The mechanism study showed that the hydroxyl radical was the active radical in the reaction. Benefiting from the “polarity strategy”, the sulfone product accumulated after 23 cycles in a C16VW12 system, and the yield and purity were about 84% and 100%, respectively.
研究领域:
化学
·
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 4
·期 2
·657-666
·
IF 7.443
Yiqun Jiang,Xiulin Fan,Xuezhang Xiao,Teng Qin,Liuting Zhang,Fulei Jiang,Meng Li,Shouquan Li,Hongwei Ge,Lixin Chen
Highly dispersed AgPd hollow spheres anchored on graphene (denoted as AgPd-Hs/G) were successfully synthesized through a facile one-pot hydrothermal route for the first time. The fabrication strategy was efficient and green by using L-ascorbic acid (L-AA) as the reductant and trisodium citrate dihydrate as the stabilizer, without employing any seed, surfactant, organic solvent, template, stabilizing agent, or complicated apparatus. The as-synthesized AgPd-Hs/G catalyst exhibits a sphere-shaped hollow structure with an average diameter of about 18 nm and a thin wall of about 5 nm. The hollow architecture with a thin wall and excellent dispersion on the graphene ensure that most of the atoms are located on the surface or sub-surface, which provides reactive catalytic sites for the dehydrogenation of formic acid. Therefore, a superior catalytic effect was achieved compared with other catalysts such as Pd/G and AgPd/C. The as-synthesized AgPd-Hs/G exhibits a catalytic activity with an initial turnover frequency (TOF) value as high as 333 mol H2 mol−1 catalyst h−1 even at room temperature (25 °C) toward the decomposition of formic acid. The present AgPd-Hs/G with efficient catalysis on the dehydrogenation of formic acid without any CO generation at room temperature can pave the way for a practical liquid hydrogen storage system and therefore promote the application of formic acid in fuel cell systems.
研究领域:
材料科学
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催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zhiyuan Liu,Jingpeng Niu,Weimin Long,Bing Cui,Kun Song,Fan Dong,Dong Xu
Indoor formaldehyde from substandard furniture and decorative materials seriously endangers human health. How to remove effectively indoor formaldehyde with low concentration at room temperature is a challenging problem. Using a MnO2/AlOOH composite by the MnO2 modification as a catalyst provides an effective approach to solve this challenge. Here, a new type of MnO2/AlOOH composite catalyst with high ability to remove indoor low-concentration formaldehyde was prepared by redox reaction at room temperature. A MnO2/AlOOH composite with a homogeneous dispersion of MnO2 has high specific surface area and a large amount of surface hydroxyl (−OH) which plays a major role in the adsorption of formaldehyde. A partially crystalline structure was observed in the composite, which contains multivalent Mn ions and a large number of vacancy defects. The surface −OH of composite shows strong oxidation activity through the charge exchange of multivalent Mn ions and vacancy defects. The composite has a higher ability to remove indoor low-concentration formaldehyde compared to the birnessite MnO2 at room temperature. This study proposes a new idea for the improvement of catalytic performance in the structure and composition of the catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Kuai Long,Chen Zheng,Liu Shoujie,Kan Erjie,Yu Nan,Ren Yiming,Fang Caihong,Li Xingyang,Li Yadong,Geng Baoyou
Selective reduction of ketone/aldehydes to alcohols is of great importance in green chemistry and chemical engineering. Highly efficient catalysts are still demanded to work under mild conditions, especially at room temperature. Here we present a synergistic function of single-atom palladium (Pd 1 ) and nanoparticles (Pd NPs ) on TiO 2 for highly efficient ketone/aldehydes hydrogenation to alcohols at room temperature. Compared to simple but inferior Pd 1 /TiO 2 and Pd NPs /TiO 2 catalysts, more than twice activity enhancement is achieved with the Pd 1+NPs /TiO 2 catalyst that integrates both Pd 1 and Pd NPs on mesoporous TiO 2 supports, obtained by a simple but large-scaled spray pyrolysis route. The synergistic function of Pd 1 and Pd NPs is assigned so that the partial Pd 1 dispersion contributes enough sites for the activation of C=O group while Pd NPs site boosts the dissociation of H 2 molecules to H atoms. This work not only contributes a superior catalyst for ketone/aldehydes hydrogenation, but also deepens the knowledge on their hydrogenation mechanism and guides people to engineer the catalytic behaviors as needed.
研究领域:
化学工程
·
绿色化学
·
催化科学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Mingzhen Li,Yongsheng Li,Zekun Jing,Deshun Huang,Guozong Yue,Yakun Guo,Maobing Shuai
The selective hydrogenation of nitroaromatics is a promising and environmentally friendly method for synthesizing the chemical intermediates of functionalized aromatic amines. However, achieving room-temperature hydrogenation remains a formidable challenge. In this study, we prepared a high-entropy alloy (HEA) catalyst with a similar core–shell structure, with a Pt-rich HEA as the shell and a CuNi-rich HEA as the core. This catalyst enables 100% conversion and selectivity for the hydrogenation of p-chloronitrobenzene under ambient temperature, in both solvent-involved and solvent-free systems. Additionally, it exhibits excellent stability, recyclability, and versatility. Furthermore, heat treatment-induced disruption of the Pt-rich surface structure leads to significant reduction in catalytic activity or even deactivation due to the migration of surface Pt atoms towards the interior of the alloy. These findings highlight the crucial role played by the Pt-rich surface structure in attaining outstanding performance in nitroaromatic hydrogenation. This work offers novel insights and strategies for designing efficient catalysts tailored specifically for selective nitroaromatic hydrogenation.
研究领域:
化学工程
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Fang Liu,Ranran Cao,Shaopeng Rong,Pengyi Zhang
Room-temperature active catalysts are very important to combat against ubiquitous indoor HCHO pollution. Here, tungsten doped MnO 2 (W-MnO 2 ) was first synthesized and investigated for HCHO decomposition at ambient temperature. With addition of WCl 6 as precursor into the mixture of permanganate and manganese chloride, tungsten-doped δ-MnO 2 with weak crystallinity and large specific surface area (>230 m 2 /g) was synthesized. Substitution of W 6+ for Mn in MnO 6 groups reduced the chemical valence of Mn and made adsorbed surface oxygen species more active. As a result, the W-MnO 2 catalyst with the nominal W/Mn ratio achieved efficient and stable activity for real-level indoor HCHO (0.3 mg/m 3 ) under the GHSV as high as 600 L/g cat ·h, the removal efficiency reaching 90% at 30 °C and 60% at 5 °C, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-12
·
IF 2.4
Wang Xiuxiu,Zhao Jiawei,Zhao Chuanjun,Zhang Yexin,Mahmud Sakil,Zhang Jian
The catalytic removal of trace formaldehyde (HCHO) at ambient temperatures is crucial for improving indoor air quality, necessitating the use of monolithic catalysts over traditional powder forms for real-world applications. In this study, an aluminosilicate fiber-woven ceramic filter paper (CFP) was selected as the substrate, onto which a Mn 2 O 3 catalyst was in situ coated via a combustion method utilizing Mn(NO 3 ) 2 as the oxidant and glycine as the fuel. The resulting monolithic Mn 2 O 3 /CFP catalyst was compared to a MnO 2 /CFP catalyst, prepared by direct decomposition of Mn(NO 3 ) 2 on the same substrate. The Mn 2 O 3 /CFP catalyst exhibited superior characteristics for HCHO oxidation, including a more porous architecture, higher redox capability, and an abundance of surface-active oxygen species with enhanced mobility of surface lattice oxygen. These features enabled the Mn 2 O 3 /CFP catalyst to achieve significantly higher HCHO conversion at room temperature (90%) compared to the MnO 2 /CFP catalyst (21%). Additionally, in a durability test carried out in a mode of dynamic flow at room temperature, the Mn 2 O 3 /CFP catalyst maintained a high HCHO conversion rate of 66% over 11 days, demonstrating its potential for practical indoor air purification applications. Graphical abstract
研究领域:
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）