Catalysts
·
2021
·Vol. 11
·期 10
·1187
·
IF 4.146
Qiuyue Zhou,Zhi-Qiang Wang,Wei Hong,Baohui Lou,Shihui Zou
Oxidative dehydrogenation of KA-oil (a mixture of cyclohexanone and cyclohexanol) is an economically attractive process to produce cyclohexanone because it provides a chance to avoid the energy-intensive alcohol-ketone separation process. The application of this process, however, is hampered by the low cyclohexanone selectivity which results from the competitive adsorption of cyclohexanol and cyclohexanone on the catalyst surface. Herein, by engineering Pt-Bi2O3interface to tune the geometric and electronic structure of Pt, we successfully weaken the cyclohexanone adsorption without compromising the oxidation of cyclohexanol. As a result, Bi2O3-Pt/SiO2with Bi-to-Pd ratio of 0.2 exhibits a 5 times higher cyclohexanone selectivity than Pt/SiO2at the same conversion of KA oil. Long term test suggests that the Pt-Bi2O3interface is stable in the oxidative dehydrogenation of KA-oil.Keywords:KA-oil;oxidative dehydrogenation;bismuth;Pt;electronic effect
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Guilin Wei,Linsen Zhou,Xianglin Wang,Ru Tang,Kelin Chen,Junhong Luo,Jiangfeng Song,Yan Shi,Ning Liu,Xingwen Feng
The construction, use, and maintenance of tritium-related equipment will inevitably produce tritium-containing radioactive waste gas, and the production of efficient catalysts for tritium removal remains a difficult problem. Herein, silicalite-1 zeolite with entrapped Pt nanoclusters is skillfully post-oxidized at an appropriate temperature, building highly active Pt─O sites on the nanoclusters to achieve efficient oxidation of hydrogen isotopes at low temperatures. The designed Pt─O sites can directly participate in the oxidation reaction of hydrogen isotopes. Compared to the case without Pt─O sites, the presence of these sites significantly reduces the reaction energy barrier to 0.55 eV, enabling the catalyst to achieve a hydrogen conversion rate of 99% at a low temperature of 40 °C. Specifically, the O atoms consumed by the Pt─O sites in the reaction are replaced by O 2 gas and this cycle repeats, which is consistent with the Mars-van Krevelen (M–K) theory. This ensures efficient catalytic oxidation of hydrogen isotopes, and provides an astonishingly high conversion rate of 99% in the nearly 34 days restart performance test. The results of this study provide insights into the strategic design of efficient catalysts for hydrogen isotope oxidation.
研究领域:
催化化学
·
核能科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huihui Shi,Peixin Yang,Lu Huang,Yali Wu,Duohuan Yu,Hangfei Wu,Yunhuai Zhang,Peng Xiao
The design and manufacture of high activity and thermal stability catalysts with minimal precious metal loading is essential for deep degradation of volatile organic compounds (VOCs). In this paper, a novel single-atom Pt-CeO 2 /Co 3 O 4 catalyst with ultra-low Pt loading capacity (0.06 wt%, denoted as 0.06Pt-SA) was fabricated via one-step co-precipitation method. The 0.06Pt-SA exhibited excellent toluene degradation activity of T 90 = 169 °C, matched with the nanoparticle Pt-supported CeO 2 /Co 3 O 4 catalyst with more than six times higher Pt loading (0.41 wt%, denoted as 0.41Pt-NP). Moreover, the ultra-long durability (toluene conversion remains 99% after 120 h stability test) and excellent toluene degradation ability in a wide space speed range of 0.06Pt-SA were superior to that of 0.41Pt-NP catalyst. The excellent performance was derived from the strong metal-support interaction (SMSI) between the single atomic Pt and the carrier, which induced more Pt 0 and Ce 3+ for oxygen activation and more Co 3+ for toluene removal. The in situ diffuse reflectance infrared spectroscopy (DRIFTS) experiments confirmed that the conversion of intermediates was accelerated in the reaction process, thereby promoting the toluene degradation. Our results should inspire the exploitation of noble single-atomic modification strategy for developing the low cost and high performance VOCs catalyst.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Shenghong Wang,Changan Zhou,Yongda Cao,Lei Song,Lirong Zheng,Kui Ma,Hairong Yue
Electrochemical water–gas shift (EWGS) reaction is an emerging technology with energy-saving and environmental-friendly advantages to produce high-purity hydrogen form the waste gas containing CO. However, it remains a significant challenge to design superior activity and highly durable EWGS electrocatalysts, particularly with low content of noble metals. Herein, a series of Pt-xCu/Fe 2 O 3 (x = 0, 2, 5) catalysts are synthesized by the complexation precipitation method to construct coupling sites between Pt and CuOx, aiming to optimize the adsorption of CO and the activation of OH – . The obtained 2.5Pt-2Cu/Fe 2 O 3 catalyst presents a unique Pt-O-Cu structure, delivering a much lowest onset potential, high specific activity, and excellent mass activity (1.5 A·mg Pt -1 ) at 0.73 V ( vs. RHE), which is over 15 and 3 times that of commercial Pt/C (20%) and unmodified Pt/Fe 2 O 3 catalyst, respectively. Meanwhile, the in-situ X-ray absorption results demonstrate that the facilitated interaction among the Pt-O-Cu structure promotes the high durability of the 2.5Pt-2Cu/Fe 2 O 3 catalyst and the operability at high potential. More importantly, the moderate binding of CO and moderate activation of OH* are suggested for boosting the reactivity in the CO electro-oxidation reaction. In particular, the fabricated Pt||2.5Pt-2Cu/Fe 2 O 3 , employed in coupling the HER and CO electro-oxide reaction, shows a remarkable hydrogen production of about 98 mmol H2 ·h −1 ·mg Pt −1 at 0.8 V ( vs. RHE). This work also definitely confirms the possibility of the catalyst being applied to produce hydrogen under practical conditions with different concentrations of CO, even being applied in the purification of trace CO in a hydrogen-rich atmosphere.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Kaili Wang,Tingting Zhou,Jia He,Zhen Cao,Zaiyong Jiang
Pt based electrocatalysts are considered as very promising for methanol oxidation reaction (MOR). Especially, the PtRu alloy catalysts has attracted more and more attentions. However, the catalytic efficiency of PtRu electrocatalyst is seriously hampered originated from the poisoning effect of CO* intermediate during MOR process. Herein, we have regulated the Pt/Ru atom ratio and controlled the morphology to optimize electronic structures of the alloy for achieving excellent MOR performance. The obtained Pt 2 Ru 1 alloy nanowires display the most negative peak potential of CO oxidation in contrast to commercial Pt/C, PtRu/C catalysts, Pt 3 Ru 1 and Pt 1 Ru 1 alloy nanowires, indicating an excellent anti CO poisoning activity. In addition, the adsorption capacity of OH* on Pt 2 Ru 1 alloy nanowires is obviously improved compared to commercial Pt/C and PtRu/C electrocatalysts, which is in favor of the oxidizing of CO* intermediate. Therefore, the Pt 2 Ru 1 alloy nanowires exhibit significantly enhanced specific activity (2.30 mA cm −2 ) and mass activity (1.29 A mg Pt −1 ) towards MOR compared to those of commercial Pt/C and PtRu/C electrocatalysts. The research offers a potential insight for designing highly efficient electrocatalysts for MOR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Lin Zhu,He-ying Xia,Chun-yong Zhang,Ying Geng,Zhe Li,Li Shu,Ji-rong Bai,Ying-pin Wen
As a new type of efficient electrochemical energy storage system, the supercapacitor serves as an effective means to support the development of clean energy, with the electrode material being the key determinant of performance. The electrode material Pt-NiCo 2 O 4 /C was prepared in this paper by stepwise hydrothermal and calcination methods using ZIF-67 as a template, aiming to improve specific capacitance performance and stability. Pt-NiCo 2 O 4 /C achieved a specific capacitance of 1665.3 F/g at a current density of 1.0 A/g, and maintained 94.49% of the original specific capacity after 3500 cycles at a current density of 4.0 A/g. The excellent specific capacitance performance of the Pt-NiCo 2 O 4 /C electrode material makes it a promising potential candidate for energy storage applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zhilin Zhang,Guangzhi He,Yaobin Li,Changbin Zhang,Jinzhu Ma,Hong He
Pt/Al2O3 catalysts showing excellent activity and stability have been used in various reactions, including HCHO oxidation. Herein, we prepared Pt–Na/Al2O3 catalysts with a Pt content of 0.05 wt % to reveal the key factors determining the anchoring of Pt as well as the catalytic activity and mechanism of HCHO oxidation. Pt–Na/nano-Al2O3 (denoted as Pt–Na/nAl2O3) catalysts with 0.05 wt % Pt content could completely oxidize HCHO to CO2 at room temperature, which is the lowest Pt content used in HCHO catalytic oxidation to our knowledge. After Na addition, terminal hydroxyl groups (denoted as HO-μter) on nano-Al2O3 were transformed to doubly bridging hydroxyl groups between Na and Al (denoted as HO-μbri(Na–Al)), which atomically dispersed Pt species. Pt anchoring further promoted the regeneration of HO-μbri(Na–Al) by activating O2 and H2O, oxidizing HCHO to CO2 directly by the fast reaction step ([HCOO–] + [OH]a → CO2 + H2O). Our study revealed that the HO-μbri(Na–Al) synergistically generated by HO-μter and Na species provided anchoring sites for Pt species.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED OPTICS
·
2024
·Vol. 63
·期 10
·A70
·
IF 1.7
FengHong Chu,Dan Pei,ZhengLan Bian,YiSheng Sun,AnDuo Hu,GuiLin Zhang,Liang Xue,JiaWen Han,JiaMeng Zhang
Tungsten oxide (${{\rm WO}_3}$) has been widely used in hydrogen sensing due to its stable chemical properties and high oxygen vacancy diffusion coefficient. However, the response of pure ${{\rm WO}_3}$ to hydrogen is slow, and doping is an effective way to improve the hydrogen sensing performance of ${{\rm WO}_3}$ materials. In this paper, ${{\rm WO}_3}/{\rm Pt}/{\rm PEG}/{{\rm SiO}_2}$ porous film was prepared by the sol-gel method using tungsten powder, ${{\rm H}_2}{{\rm O}_2}$ and ${{\rm C}_2}{{\rm H}_5}{\rm OH}$ as precursors, polyethylene glycol (PEG) as the pore-forming agent, and tetraethyl orthosilicate (TEOS) as the ${{\rm SiO}_2}$ source material. The sensing properties of the ${{\rm WO}_3}$ composite for hydrogen were characterized by a transmission optical fiber hydrogen sensing system made at home. The process parameters such as water bath time, aging time, W:PEG ratio, and W:TEOS ratio were optimized to improve the sensitivity and response time of the sensing film. The experimental results indicate that the sensitivity is 15.68%, the average response time is 45 s, and the repeatability is up to 98.74% in 16 consecutive tests. The linearity index ${{\rm R}^2}$ is 0.9946 within the hydrogen concentration range of 5000 ppm to 50,000 ppm. The film responds only to ${{\rm H}_2}$ when the concentration of interfering gases (${{\rm CH}_4}$, CO, ${{\rm CO}_2}$) is 2000 ppm. The hydrogen sensing performance of the optimized film is significantly improved compared with that of the undoped film.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1299
·
IF 4.501
Yidi Zhou,Xin Min,Lijuan Wang,Yajing Zhao,Bozhi Yang,Xiaoxian Wu,Dan Zhang,Xifeng Hou,Yan’gai Liu,Minghao Fang,Zhaohui Huang
The critical need to enhance the quality of indoor air leads to the improvement of catalyst activity for the removal of formaldehyde. Sepiolite can be utilized in catalytic reactions for its unique structure, composition and high surface area. The adhesion between sepiolite fibers and the blocked microporous channel (by impurities) demands the activation of natural sepiolite through acid treatment. This treatment successfully produces acid-modified sepiolite Pt-supported samples. The impacts of different acid concentrations, Pt loading content and calcination temperature on catalytic activity for formaldehyde (HCHO) oxidation are studied. The catalytic activity of HCHO is characterized and evaluated by techniques including specific surface area, X-ray diffraction, Fourier transform infrared spectrum, X-ray photoelectron spectroscopy and transmission electron microscopy. The results show the maximum specific area of sepiolite at the optimized 0.06 M acid concentration. Among all the prepared samples, the 0.02Pt/Sep catalyst calcined at 500 °C exhibits the highest catalytic activity for the oxidation of HCHO.Keywords:HCHO;sepiolite;acid-modified;Pt nanoparticles
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
MOLECULES
·
2024
·Vol. 29
·期 2
·493
·
IF 4.2
Ligang Ma,Chao Lin,Wenjun Jiang,Shun Yan,Huilin Jiang,Xiang Song,Xiaoqian Ai,Xiaoxiao Cao,Yihuan Ding
Selective supported catalysts have emerged as a promising approach to enhance carrier separation, particularly in the realm of photocatalytic hydrogen production. Herein, a pioneering exploration involves the loading of PdS and Pt catalyst onto g-C3N4nanosheets to construct g-C3N4@PdS@Pt nanocomposites. The photocatalytic activity of nanocomposites was evaluated under visible light and full spectrum irradiation. The results show that g-C3N4@PdS@Pt nanocomposites exhibit excellent properties. Under visible light irradiation, these nanocomposites exhibit a remarkable production rate of 1289 μmol·g−1·h−1, marking a staggering 60-fold increase compared to g-C3N4@Pt (20.9 μmol·g−1·h−1). Furthermore, when subjected to full spectrum irradiation, the hydrogen production efficiency of g-C3N4@PdS@Pt-3 nanocomposites reaches an impressive 11,438 μmol·g−1·h−1, representing an eightfold enhancement compared to g-C3N4@Pt (1452 μmol·g−1·h−1) under identical conditions. Detailed investigations into the microstructure and optical properties of g-C3N4@PdS catalysts were conducted, shedding light on the mechanisms governing photocatalytic hydrogen production. This study offers valuable insights into the potential of these nanocomposites and their pivotal role in advancing photocatalysis.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Chong Yao,Dandan Ma,Jie Luo,Yixin Chen,Min Tian,Haoxuan Xie,Chunshan Lu,Feng Feng,Xiaoliang Xu,Qingtao Wang,Qunfeng Zhang,Xiaonian Li
In order to improve the catalytic performance of the nitrobenzene hydrogenation rearrangement to prepare p -aminophenol, a bimetallic Pt-Ni/C (PNC) catalyst was synthesized. Taking advantage of the synergistic effect of Ni and Pt to enhance product selectivity and catalytic performance stability, the electrons in Ni are moved to Pt by the electron effect, which affects the catalyst's ability to activate H 2 as well as the amount of hydrogen activated. Furthermore, due to the strong Pt(5d)-Ni(3d) coupling effect, Ni can effectively maintain Pt stability in the acidic system and reduce Pt dissolution. The stability of the PNC can be found to be greatly enhanced compared to the Pt/C (PC) catalyst, and p -aminophenol selectivity is greatly enhanced, showing excellent catalytic performance.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yu Huang,Xinyang Xu,Fengkun Han,Xi Chen,Guangjian Fan
Photocatalytic technology holds promising prospects for remediating naphthalene pollution in water bodies. In this work, the CN/Pt-P25 photocatalyst was successfully prepared via photodeposition combined with co-pyrolysis methods, and employed for naphthalene photodegradation under simulated sunlight. The chemical state of Pt was found to have a significant impact on the photocatalytic activity. H 2 secondary annealing effectively tuned Pt chemical states, increasing the proportion of Pt 0 species on the CN/Pt-P25 photocatalyst from 41.91 % to 62.24 %. The improved proportion of Pt 0 species proportion led to a reduction in the bandgap, which induced changes in the band positions and notably enhancing the separation efficiency of photogenerated electron-hole pairs. Under simulated sunlight irradiation, (H 2 ) CN/Pt-P25 photocatalyst achieved complete naphthalene photodegradation within 100 min. Thus, photocatalysts containing a high proportion of Pt 0 species exhibited an improved performance in naphthalene photodegradation. These findings provide new insights into the application of photocatalytic technology for the remediation of PAHs.
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）