Article
Engineering, Environmental
Rajat Subhra Ghosh, Michael P. Harold, D. Wang
Summary: Modeling and optimization were presented for the Pt/Al2O3@Cu/ZSM-5 core-shell catalyst used as an Ammonia Slip Catalyst in a recent study. The study successfully demonstrated the synthesis and application of this core-shell catalyst, showing superior performance due to enhanced Pt activity and dense zeolite shell. A heterogeneous fixed-bed reactor was developed to predict and optimize the CS catalyst performance, incorporating independent kinetic models for NH3 oxidation and NOx reduction.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Lv Shenjie, Hua Zelin, Ma Na, Guo Zhi, Shi Kangzhong, Wei Tongtong, Li Long, Li Licheng
Summary: A facile high-pressure steam treatment was developed to improve the formaldehyde oxidation performance of Pt/TiO2 catalyst. The treated catalyst showed a 4.8 times increase in formaldehyde oxidation rate compared to the pristine catalyst, along with good catalytic stability and resistance to dry environments. The treatment did not alter the structural parameters of Pt and TiO2, but resulted in the formation of a layer of bound water on the surface of Pt nanoparticles. This modification enhanced the interaction between oxygen species and surface hydroxyl, leading to accelerated reaction steps and improved low temperature HCHO oxidation performance.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Sinqobile V. L. Mahlaba, Nasseela Hytoolakhan Lal Mahomed, Alisa Govender, Junfeng Guo, Gerard M. Leteba, Pierre L. Cilliers, Eric van Steen
Summary: This study reports the aerobic selective oxidation of methane using platinum catalysts under continuous flow conditions. The addition of water enhances the selectivity towards formaldehyde and increases the reaction activity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Energy & Fuels
Lin-Cong He, Hua-Hui Xu, Xing-Yue Leng, Ling-Yun Jin, Ai-Ping Jia, Meng-Fei Luo, Jian Chen
Summary: In order to achieve high N2 selectivity in the oxidation of nitrogen-containing volatile organic compounds (NVOCs), excellent catalysts with high N2 selectivity need to be developed. CeO2 modified CuO/ZSM-5 catalysts with different CeO2 addition orders were prepared for diethylamine (DEA) oxidation. The addition of CeO2 changes the geometrical and electronic states of CuO active sites in the catalyst, and the CeO2 addition order affects the Ce3+ ratio on the surface of the catalyst. The CuO/CeO2/ZSM-5 catalyst exhibits moderate high oxidation activity and the widest temperature window (oT) for high N2 selectivity, which is T99 of 230 degrees C and oT of 150 degrees C. These preliminary results provide an efficient strategy for improving catalysts employed for selective oxidation of NVOCs.
Article
Chemistry, Physical
Sinqobile V. L. Mahlaba, Nasseela Hytoolakhan Lal Mahomed, Gerard M. Leteba, Alisa Govender, Eric van Steen
Summary: Platinum-based catalysts can selectively produce formaldehyde through the direct aerobic oxidation of methane in the presence of liquid water. The choice of support material significantly affects the catalyst's activity and product selectivity. Pt/TiO2-Rutile demonstrates high selectivity for formaldehyde formation, while TiO2-P25 leads to the formation of methanol and methoxymethanol. Catalyst deactivation is observed due to the accumulation of polymeric species on the surface.
Article
Agricultural Engineering
Run Zheng, Xiao Zhang, Weiying Li, Qixuan Lin, Xinxin Liu, Chunhui Zhang, Junli Ren
Summary: Activated carbon fiber (ACF) is a promising support material with high specific surface area and adsorption performance. In this study, a composite of platinum nanoparticles (PtNPs) and dialdehyde modified sisal fiber-based activated carbon fiber paper (ACFP) was synthesized, and PtNPs were reduced in situ by the aldehyde groups of the sisal fiber. The PtNPs-loaded ACFP showed excellent catalytic activity for formaldehyde (HCHO) oxidation, with a high specific surface area and good recyclability.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Chemistry, Physical
Eric van Steen, Junfeng Guo, Nasseela Hytoolakhan Lal Mahomed, Gerard M. Leteba, Sinqobile V. L. Mahlaba
Summary: The direct formation of formaldehyde in the selective, aerobic oxidation of methane in the presence of liquid water at ca. 498 K has been reported. The absence of the typically observed negative selectivity-conversion dependency in the aerobic oxidation of methane over platinum in the presence of water is intriguing. This perspective article discusses the main differences between this route and other methods for the selective oxidation of methane and highlights further developments for this newly developed methane activation route.
Article
Chemistry, Multidisciplinary
Lifan Qin, Hefa Cheng
Summary: The modification with Ni-Al hydrotalcite improved the activity of Pt/AlOOH, with the nanocomposite of Pt/Ni1Al9 showing remarkable catalytic performance due to larger specific surface area and more surface active sites. The enhanced catalytic activity was attributed to the generation of more surface active oxygen species activated by electron transfer and synergistic effects among different components.
Article
Engineering, Environmental
Fang Liu, Shiying Zhang, Xiangchao Zhang, Jie Shen, Long Wan, Addie Bahi, Frank Ko
Summary: The (001) facet of NaTi2HO5 was found to be more favorable for HCHO adsorption, and nanotubes of NaTi2HO5 can partially oxidize HCHO into formate while releasing very few CO, which enhances the speed of complete oxidation. The synergy between surface hydroxyl and Na atom plays a crucial role in the chemisorption of HCHO, suggesting a new advantage for HCHO oxidation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Applied
Zeinhom M. El-Bahy, Mohammed T. Alotaibi, Salah M. El-Bahy
Summary: Active new ceria-promoted platinum supported on ZSM-5 catalysts were prepared and characterized. The addition of ceria enhanced the catalytic activity, especially in CO oxidation and 4-nitrophenol reduction reactions, which may be attributed to the formation of Pt-O-Ce linkage.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Applied
Youming Ni, Wenliang Zhu, Zhongmin Liu
Summary: Metal-modified H-ZSM-5 has high selectivity of aromatics in methanol to aromatics (MTA) reaction, with HCHO formed by methanol dehydrogenation participating in aromatics synthesis, and methanol conversion producing more aromatics than olefins conversion.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Chunying Wang, Yaobin Li, Lirong Zheng, Changbin Zhang, Yin Wang, Wenpo Shan, Fudong Liu, Hong He
Summary: Metal oxides are commonly used as supports in noble metal-based catalysts for formaldehyde oxidation, but this study demonstrates the successful application of activated carbon, a nonoxide support, for Pt catalysts in HCHO oxidation. The addition of alkali metal Na enhances the stability of Pt species, increases Pt dispersion, and improves the activation of chemisorbed oxygen and water, leading to direct conversion of HCHO to CO2 and H2O on the Na-Pt/AC-R catalyst. This research extends the promotional effect of alkali metals on supported Pt catalysts to a nonoxide carrier system.
Article
Nanoscience & Nanotechnology
Xinbao Zhu, Xinyu He, Longhui Guo, Yawei Shi, Ning Zhao, Congzhen Qiao, Lei Dai, Yajie Tian
Summary: In this study, Pt nanoparticles encapsulated in ZSM-5 catalysts were prepared using a one-pot synthesis strategy for the oxidation of volatile organic compounds (VOCs). The results showed that the interaction between Pt and zeolite and the dispersion of metal were significantly enhanced after encapsulation, leading to improved catalytic activity and stability.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Environmental
Erhao Gao, Qi Jin, Tiantian Zhang, Li Han, Ning Li, Jiacheng Xu, Shuiliang Yao, Zuliang Wu, Jing Li, Jiali Zhu, Wei Wang
Summary: Doping alkali metals can enhance the catalytic activity of transitional metal oxides for formaldehyde oxidation, but the mechanism of its effect on oxygen species is not well understood. In this study, potassium-doped KxCo1-xCr2O4 catalysts with different ratios were prepared, and their structure-performance relationship and reaction mechanism for formaldehyde oxidation were investigated. The results show that K-doping successfully substituted cobalt cations and led to advantageous changes in physiochemical properties. K0.02Co0.98Cr2O4 exhibited the best activity with significantly lowered T90 and increased reaction rate. Theoretical calculations revealed that K-doping weakened the strength of metal-oxygen bonds, promoting the mobility of surface lattice oxygen for better formaldehyde oxidation. Moreover, K-doping suppressed the generation of unfavorable carbonates and improved the conversion rates of key intermediates. This work provides new insights for the development of highly efficient transitional metal oxide catalysts for formaldehyde abatement.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Wei Wang, Qinyi Zhang, Ruonan Lv, Dong Wu, Shunping Zhang
Summary: This study successfully enhanced the selectivity to formaldehyde by modifying the surface of metal oxide semiconductors with a zeolite layer, and controlled the thickness of the layer to achieve outstanding performance.
Article
Chemistry, Physical
Qi-Wen Chen, Ze-Qing Guo, Jian-Ping Zhou
Summary: Multifunctional continuous solid solutions NFMTO-x were successfully synthesized via a one-step hydrothermal method by controlling the ratio of Mg and Fe. The NFMTO-x materials exhibited enhanced visible light response, effective adsorption and photocatalytic degradation of organic pollutants, CO2 methanation capability, and easy recyclability due to their magnetic properties. This research provides a significant multifunctional material for water purification.
APPLIED SURFACE SCIENCE
(2024)
Review
Chemistry, Physical
George E. Stan, Maziar Montazerian, Adam Shearer, Bryan W. Stuart, Francesco Baino, John C. Mauro, Jose M. F. Ferreira
Summary: Bioactive glasses have the ability to form strong bonds with tissues and release therapeutic ions. However, their biomechanical compatibility limits their use in load-bearing applications. The use of magnetron sputtering technology to fabricate BG coatings shows promise in improving their efficacy and potential for application.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zhaoxuan Wang, Zhicheng Yan, Zhigang Qi, Yu Feng, Qi Chen, Ziqi Song, Meng Huang, Peng Jia, Ki Buem Kim, Weimin Wang
Summary: The corrosion behavior of Fe-60 and Fe-83 ribbons in 0.6 M NaCl was studied. Fe-60 exhibited a local corrosion mode and formed a stable passivation film with higher corrosion resistance, while Fe-83 showed a combination of local and global corrosion modes and had lower corrosion resistance. Controlling the precipitation of nanocrystalline phases and increasing the POx content in the passivation film significantly improved the corrosion resistance of Fe-based glassy alloys.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hao-Kai Peng, Sheng-Yen Zheng, Wei-Ning Kao, Ting-Chieh Lai, Kai-Sheun Lee, Yung- Hsien Wu
Summary: This study investigates the effects of high energy/fluence proton radiation on the performance of HfZrOx-based FeFETs memory with different Zr content. The results show that the characteristics of FeFETs are influenced by proton radiation, and the extent of the influence depends on the Zr content. FeFETs with 50% Zr content exhibit minimal changes in memory window and demonstrate good endurance and retention performance.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zongyi Yue, Guangyi Wang, Zengguang Huang, Sihua Zhong
Summary: In this study, AZO and ITO films were successfully tuned as excellent passivation layers for c-Si surfaces, achieving effective minority carrier lifetime and outstanding optical properties through the optimization of annealing temperature and interfacial silicon oxide.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Martin Hruska, Jan Kejzlar, Jaroslav Otta, Premysl Fitl, Michal Novotny, Jakub Cizek, Oksana Melikhova, Matej Micusik, Peter Machata, Martin Vrnata
Summary: This paper presents a detailed study on the hydrogen sensing capabilities of highly nanoporous black gold films. The films exhibit fast response and recovery times at low temperatures. Different levels of nanoporosity were prepared and tested to investigate the sensing properties, and it was found that nanoporous black gold is suitable for hydrogen sensing. The sensitivity of the film depends on its nanoporosity.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yupu Wang, Gaofeng Teng, Chun To Yiu, Junyi Zhu
Summary: In the study of BM-SCO and HSCO thin films, it was found that H vacancies tend to prefer sites near the external surface or oxygen vacancy channels (OVCs), while H interstitials prefer sites of oxygen on a layer that contains six-fold coordinated Co. These findings not only enrich the understanding of complex surface phenomena of defect formation but also provide an explanation for the reversibility during phase transformation.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jiafeng Lu, Linping Teng, Qinxiao Zhai, Chunhua Wang, Matthieu Lancry, Ye Dai, Xianglong Zeng
Summary: In this study, we achieved full control of fiber nanograting orientation by manipulating laser polarization, and tailored space variant fiber nanogratings, which expanded the diversity in fiber nanograting engineering.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yibo Liu, Yujie Tao, Yue Liu, Qi Sun, Qinrong Lin, Kexin Kang, Qinghua Zhang, Qingjie Sun
Summary: This study investigates the wettability of the Ti-Cu-Fe multi-metal system, specifically the wetting behaviors of CuSi3 droplets on TC4 and 304SS plates. The results show that the CO2 + Ar gas atmosphere significantly affects interfacial mass transfer, thus influencing the wettability of the systems.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jimei Liu, Fei Wang, Rong Guo, Yuqi Liu, Mengyu Zhang, Jaka Sunarso, Dong Liu
Summary: This study developed Co/MXene composites with anti-corrosion properties by varying the cobalt content. These composites exhibited remarkable electromagnetic absorption performance and high resistance to corrosion under various corrosive conditions. The study also revealed the mechanism of electron transfer from cobalt to MXene and the electromagnetic dissipation behavior originated from polarization loss alone.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Moujie Huang, Yongsong Ma, Jingbo Yang, Lingyun Xu, Hangqi Yang, Miao Wang, Xin Ma, Xin Xia, Junhao Yang, Deli Wang, Chuang Peng
Summary: Strong metal-support interactions (SMSIs) are important for enhancing catalytic activities and stability in thermal catalysis. This study demonstrates a method to create SMSIs in electrocatalysis using carbon nanotubes and Ru nanoparticles, resulting in excellent catalytic activity and stability.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Ravi Trivedi, Brinti Mondal, Nandini Garg, Brahmananda Chakraborty
Summary: This study explores the potential of biphenylene as a nanocarrier for the delivery of the anticancer drug cisplatin. It is found that biphenylene offers physical stability, rapid release rate, solubility, and bio-compatibilities compared to other nanocarriers. The adsorption of cisplatin on the surface of biphenylene involves charge transfer from cisplatin to biphenylene. The drug is shown to be released at body temperature in an acidic environment. Biphenylene also exhibits excellent cytotoxicity activity and cellular uptake of the drug. Overall, biphenylene shows promise as a potential nanocarrier for cisplatin delivery.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yasir Abbas, Shafqat Ali, Sajjad Ali, Waqar Azeem, Zareen Zuhra, Haoliang Wang, Mohamed Bououdina, Zhenzhong Sun
Summary: In this study, FeOx@SPNO-C core-shell nanospheres as a catalyst for degradation of sulfamethoxazole (SMX) were successfully synthesized. The synergistic interaction between FeOx and SPNO-C, high carbon charge density, and the presence of C = O groups and N/Fe-Nx sites were found to be key factors for the enhanced degradation of SMX.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Physical
Qiaoting Yang, Yuxiao Gong, Yan Qian, Zhou-Qing Xiao, Serge Cosnier, Xue-Ji Zhang, Robert S. Marks, Dan Shan
Summary: This study proposes a hierarchical confinement strategy to design Prussian blue nanoparticles (PB NPs) with satisfactory electrocatalytic ability and stability. The catalytic synthesis of PB NPs is achieved through a hydrothermal process, and the as-prepared PB@NH2MIL exhibits efficient electronic transmission and enhanced electrocatalytic properties.
APPLIED SURFACE SCIENCE
(2024)