Article
Agricultural Engineering
Abid Farooq, Su Shiung Lam, Gwang Hoon Rhee, Jechan Lee, Moonis Ali Khan, Byong-Hun Jeon, Young-Kwon Park
Summary: The catalytic fast pyrolysis of low sulfonated Kraft lignin was studied under different atmospheric environments. The use of Zn-or Mo-loaded HZSM-5 catalyst resulted in higher pyrolytic oil yield and increased benzene, toluene, and xylenes yields. The enhanced CH4 activation via metal loading and the formation of a hydro-pyrolysis environment through CH4 decomposition were observed. The CH4-D environment showed a higher presence of H-2 in the product gas.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Tingting Wu, Xianzhen Song, Xiang Ren, Li Dai, Hongmin Ma, Dan Wu, Yuyang Li, Qin Wei, Huangxian Ju
Summary: A novel microfluidic photoelectrochemical (PEC) analytical device based on AgBiS2@Ag nanozyme-mediated signal amplification was developed for ultrasensitive detection of cytokeratin 19 fragment 21-1 (CYFRA 21-1). The device utilized a new Z-scheme BiVO4/ZnIn2S4 (BZIS) photoactive material as a sensing matrix and integrated the photoelectrode into microfluidic chips for automatic sample injection and detection. The use of AgBiS2@Ag nanozyme effectively amplified the PEC signal, resulting in a wide linear range and low detection limit for CYFRA 21-1 determination.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Bjorn Altenburger, Carl Andersson, Sune Levin, Fredrik Westerlund, Joachim Fritzsche, Christoph Langhammer
Summary: This study introduces nanofluidic scattering microscopy to measure the activity of single nanoparticles during catalytic reactions. By detecting minuscule refractive index changes in the liquid, the concentration changes of reactants can be accurately measured. The turnover frequency of the particles is derived from the growth rate of gas bubbles formed during the reaction.
Article
Biotechnology & Applied Microbiology
Weicheng Xiong, Ge Pu, Jiashan Chen, Pengcheng Wang
Summary: A series of Mo-Fe/TiO2 catalysts were employed for catalytic decomposition of vaporized H2O2 to remove nitric oxide in the low-temperature range (80-160 degrees C). The experiment results showed that the 1.5%Mo-0.5%Fe/TiO2 catalyst exhibited the best catalytic activity and 97.6% NO removal efficiency was obtained at 80 degrees C. Oxygen vacancies and (OH)-O· radicals were found to play a key role in the catalytic process. The catalyst also demonstrated great stability and sulfur resistance, making it a promising option for industrial flue gas denitrification.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Physical
Weijie Yang, Liugang Chen, Binghui Zhou, Zhenhe Jia, Xiaoshuo Liu, Yanfeng Liu, Hao Li, Zhengyang Gao
Summary: In this study, the combination of single-atom catalysts and H2O2 as an oxidant is proposed for the catalytic oxidation of nitrogen oxide (NO). The reaction pathways for NO oxidation using H2O2 were determined through theoretical calculations and modeling, with *OOH identified as the most favorable pathway with the highest reaction rate and *HNO3 as the main oxidation product. Compared to conventional oxidants and catalysts, using H2O2 on Fe-N-4-C catalyst lowers the reaction energy barriers and enables the deep oxidation of NO. This research provides valuable insights for the development of materials for NO removal.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Muhammad Hasnun Md Yusoff, Chee-Yuen Gan, Muhammad Hakimin Shafie
Summary: In this study, deep eutectic solvents (DESs) based on citric acid monohydrate (CAM) and glycerol (GLY) were successfully synthesized. The DES with a molar ratio of CAM-GLY 1:1 exhibited the lowest eutectic point and water absorption rate. Furthermore, the DES showed a higher extraction capacity for polysaccharides compared to conventional citric acid.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Zhen Wang, Bao Liu, Xing Yang, Changtai Zhao, Peng Dong, Xue Li, Yannan Zhang, Kieran Doyle-Davis, Xiaoyuan Zeng, Yingjie Zhang, Xueliang Sun
Summary: A highly efficient synergistic catalyst, IrRu/N-CNT, with flexible geometric and electronic structures, has been synthesized. This catalyst effectively reduces the potential polarization in Li-CO2 batteries, resulting in improved energy efficiency and cycling performance. The dual catalytic sites on the surface of IrRu nanoalloys modify the electronic structures and shorten the electron transfer pathway, leading to the deposition of film-like Li2CO3 products and achieving high discharge capacity and stability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Yong-Chao Zhao, Bo Long, Joseph S. Francisco
Summary: This study investigates the mechanism and quantitative kinetics of the CH2OO + H2O2 reaction, showing that the rate constant of the reaction changes with temperature and can impact the distribution of H2O2 under certain atmospheric conditions.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Wen Guo, Yuanhang Lin, Siqi Chen, Zhenheng Diao
Summary: In this study, Fe-ZSM-5 zeolite catalysts were prepared using different compounds as structure-directing agents and mesoporogens, and their oxidation-removal efficiency of NO in a hydrothermal reaction was investigated. The effects of ethanol in the synthesis gel and its mechanism were explored. The results showed that the addition of an appropriate amount of ethanol improved the catalyst activity and enhanced the efficiency of NO oxidation-removal.
Article
Chemistry, Multidisciplinary
John McGrady, Yuta Kumagai, Yoshihiro Kitatsuji, Akira Kirishima, Daisuke Akiyama, Masayuki Watanabe
Summary: This study investigated the effect of temperature on the oxidative dissolution of UO2 in bicarbonate solution. At higher bicarbonate concentrations, increasing temperature led to a decrease in dissolved U concentration, which was attributed to the formation of U-VI-bicarbonate species and a change in the mechanism of H2O2 decomposition from oxidative to catalytic. At lower bicarbonate concentrations, no obvious correlation between temperature and U dissolution was observed.
Article
Chemistry, Multidisciplinary
Daniel Olsson, Junyi Li, Mats Jonsson
Summary: The interfacial radiation chemistry of UO2 is crucial for the development of corrosion rate prediction models for spent nuclear fuel in contact with groundwater. The oxidative dissolution of UO2 induced by radiolytically produced H2O2 is of great significance. Stable uranyl peroxo-carbonato complexes formed by UO22+ in water containing H2O2 and HCO3-/CO32- have been largely overlooked in previous studies. Experimental results show that these complexes have little to no reactivity with the solid UO2 surface under certain conditions. The dissolution rate depends on the UO22+ concentration and is limited by the free H2O2 fraction.
Article
Biochemistry & Molecular Biology
Alexander Gorokhovsky, Natalia Morozova, Gleb Yurkov, Olga Grapenko, Alexander Kozinkin, Alexei Kozakov, Anatoliy Nikolskiy, Elena Tretyachenko, Andrey Semenov, Vitaliy Solodilov
Summary: It has been found that potassium polytitanate powder (PPT) synthesized at 500°C by treating powdered TiO2 with a mixture of KOH and KNO3 is a low-cost and efficient catalyst for the decomposition of H2O2 in aqueous solutions. The catalytic activity of PPT depends on the weight ratio of [TiO2]:[KOH]:[KNO3], and increases with the amount of KNO3. This increase in catalytic activity is attributed to the increased concentration of Ti4+-O(H)-Ti4+ groups on the surface of PPT.
Article
Engineering, Chemical
Rok Sitar, Javishk Shah, Zhenyu Zhang, Hope Wikoff, Colin A. Wolden
Summary: This study presents an efficient method for extracting high purity hydrogen from ammonia decomposition using a catalytic membrane reactor (CMR). By reducing the thickness of the Pd membrane and adding a commercial catalyst, the CMR can handle higher ammonia flowrates without sacrificing conversion. Zeolite clinoptilolite is used to reduce ammonia impurities to the required levels. Furthermore, the durability test shows significant improvement in membrane permeability.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Anqi Wang, Gerald H. Pollack
Summary: The investigation showed that infrared light irradiation can cause the expansion of the negatively charged exclusion zone (EZ) and positively charged proton zone (PZ) formed in the vicinity of Nafion, promoting the buildup of interfacial water and charge separation.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jing Lv, Libo Zhang, Li Zhu, Feng Wang, Yan Zhang, Wenfang Zheng, Linghua Tan
Summary: A fast and mild solution-phase method was developed to synthesize d-Ti3C2Tx/ZnO composites. The composites showed superior catalytic performance and could be prepared easily without heating. Utilizing electrostatic interactions and hydrolysis processes, ZnO nanoparticles were rapidly generated on the delaminated Ti3C2Tx surface, offering great potential for large-scale batch preparation of other metal oxide and MXene composites.
APPLIED SURFACE SCIENCE
(2021)
