Article
Chemistry, Physical
Jing Jiang, Shiyu Yang, Huili Lei, Lunhong Ai
Summary: Porous carbon nanostructures as supports can stabilize highly dispersed metal nanoparticles and facilitate mass transfer in reactions; catalytically active porous structures were synthesized and characterized for the efficient catalytic hydrolysis of NaBH4; the prepared Co@NC-600 sample shows high activity due to the catalytically active metallic Co and suitable support effect of N-doped carbon.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Merve Altinsoy, Ayhan Abdullah Ceyhan
Summary: In this study, a cobalt-doped catalyst was prepared from chicken eggshell powder for the hydrolysis of sodium borohydride. The effects of various parameters on the hydrolysis process were examined. The prepared catalyst showed a high hydrogen generation rate and good reusability, making it advantageous for use in sodium borohydride hydrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Polymer Science
Ahmed Abutaleb, Ibrahim M. Maafa, Nasser Zouli, Ayman Yousef, M. M. El-Halwany
Summary: Metallic Co NPs@poly(vinylidene fluoride-co- hexafluoropropylene) nanofibers (PVFH NFs) were synthesized through electrospinning and in situ reduction of Co2+ ions onto PVFH membrane. Physiochemical techniques confirmed the formation of metallic Co@PVFH NFs. The formulation with 40 wt% Co showed the highest catalytic activity in dehydrogenation of sodium borohydride (SBH), producing 110 mL of H-2 in 19 min at 25 degrees C. The catalyst also exhibited outstanding stability after six cycles of hydrolysis.
Article
Chemistry, Physical
Mohammad Hassan Loghmani, Mona Jalali Rad
Summary: In this study, the use of extracted Glucomannan from Orchis Mascula as a matrix for stable cobalt catalysts in the hydrolysis of sodium borohydride for hydrogen generation was explored. The size, morphology, and activity of Co-glucomannan powders were studied by varying MAA/MBA ratios, with characterization done using XRD, XPS, FE-SEM, and TEM techniques. The catalytic activity of Co-glucomannan was tested on the hydrolysis of sodium borohydride, and kinetic studies were used to determine the partial order respect to catalyst dosage and initial concentration of sodium borohydride. The activation energy of the reaction was calculated using the Arrhenius equation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Dinh Trinh Tran, Tap Huu Van, Yu-chih Tsai, Kun-Yi Andrew Lin, Tuan Dinh Duong
Summary: This study reports the design and fabrication of a cobalt-based catalyst for the hydrolysis of sodium borohydride (NaBH4), which shows excellent catalytic activity and stability. The hierarchical porous hollow core-shell framework cobalt oxide (HCSCO) catalyst exhibits a high H-2 generation rate and a low activation energy. Compared to other catalysts, HCSCO demonstrates superior performance. This research provides a valuable strategy for the synthesis and fabrication of efficient catalysts.
Article
Chemistry, Physical
Ceren Saka, Derya Yildiz, Sefika Kaya, Aykut Caglar, Dilarasu Elitok, Elif Yayli, Mustafa Kaya, Rasit Atelge, Hilal Kivrak
Summary: In this study, activated carbon is prepared from defatted hazelnut bagasse and its catalytic activities for NaBH4 methanolysis and electrooxidation are evaluated. The material characterization results show that the prepared activated carbons are successful. The N2 adsorption-desorption results reveal that FH3-500 activated carbon has the highest BET surface area, total pore volume, and micropore volume. Additionally, FH3-500 activated carbon catalyst exhibits the highest initial hydrogen production rate and FH2-500 activated carbon shows the highest electrocatalytic activity and stability for sodium borohydride electrooxidation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Cafer Saka
Summary: Phosphorus-doped graphitic carbon nitride (gC3N4) has been used as a catalyst in the dehydrogenation of sodium borohydride (NaBH4) methanolysis for the first time. The reaction parameters including interaction time, NaBH4 concentration, catalyst amount, and temperature were investigated. The results showed that the catalyst had good performance in the reaction, and its activity was affected by the above-mentioned parameters.
Article
Environmental Sciences
Aishah Mahpudz, Siu Ling Lim, Hitoshi Inokawa, Katsuki Kusakabe, Ryuichi Tomoshige
Summary: The study successfully synthesized a non-noble metal cobalt nanoparticle catalyst supported on layered double hydroxide, which showed efficient catalytic hydrolysis of sodium borohydride to produce hydrogen. The optimized size of cobalt nanoparticles enhanced catalytic activity, but the catalyst exhibited gradual decrease in activity during repeated tests.
ENVIRONMENTAL POLLUTION
(2021)
Article
Energy & Fuels
Cafer Saka
Summary: A hybrid g-C3N4-SiO2-N composite was successfully produced using calcination and hydrothermal methods. The composite catalyst showed excellent catalytic performance in the H2 production reaction from NaBH4 methanolysis, with a high hydrogen generation rate and good durability.
Article
Chemistry, Physical
Saba Samatya Olmez, Asim Balbay, Cafer Saka
Summary: Carbon nanodots were successfully synthesized from pomegranate peels and doped with phosphoric acid through a hydrothermal process. The doped nanodots were used as a metal-free catalyst for hydrogen production from sodium borohydride methanolysis. The characteristics of the catalyst were extensively analyzed, and the results demonstrated its excellent catalytic performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Applied
Juan Mu, Yongqing Ye, Jiale Wang, Zhengwang Zhu, Yandong Wang, Haifeng Zhang
Summary: The ribbon catalyst made of high-entropy alloy shows excellent catalytic performance for the hydrolysis of NaBH4, with the exposure of Co and Ni atoms during acid solution corrosion contributing to the increased specific surface area and formation of vacancies and dislocations. This research paves the way for the application of macroscopic scale high-entropy alloy in the catalytic hydrogen field.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Shuyan Guan, Lulu An, Yumei Chen, Mingbin Li, Jianchao Shi, Xianyun Liu, Yanping Fan, Baojun Li, Baozhong Liu
Summary: In this study, ultrathin carbon stabilized Co-doped CoxOy nanofilms (C-Co/CoxOy NFs) were successfully prepared using an ionic liquid/water interface strategy for hydrogen generation from NaBH4 hydrolysis. The 2D NF catalyst exhibited remarkable activity, with a hydrogen generation rate of 8055 mL.min(-1).g(Co)(-1) and could be recycled more than 20 times, surpassing most reported metal-based catalysts. The exceptional 2D Co-based NF structures with numerous active sites assisted in the activation of NaBH4 and water molecules, promoting hydrogen production effectively.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Energy & Fuels
Su Sang Yu, Tae Hoon Lee, Taek Hyun Oh
Summary: In this study, an Ag-Ni electrocatalyst supported on multiwalled carbon nanotubes was investigated for direct borohydride-hydrogen peroxide fuel cells. The Ag41Ni59/MWCNTs catalyst exhibited the highest catalytic activity and selectivity among the investigated catalysts. The prepared Ag-Ni bimetallic electrocatalyst has moderate catalytic activity and selectivity and is cost effective.
Article
Chemistry, Physical
O. V. Netskina, E. S. Tayban, V. A. Rogov, A. M. Ozerova, S. A. Mukha, V. I. Simagina, O. V. Komova
Summary: In the study, it was found that cobalt catalysts are more active than nickel catalysts in the hydrolysis of sodium borohydride. One reason for the lower activity of nickel catalysts is the presence of hydrogen on its surface, which interferes with reactant adsorption. The addition of cobalt to nickel catalysts can enhance hydrogen generation rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yu-Jin Lee, Arash Badakhsh, Dongsu Min, Young Suk Jo, Hyuntae Sohn, Chang Won Yoon, Hyangsoo Jeong, Yongmin Kim, Kwang-Bum Kim, Suk Woo Nam
Summary: By incorporating aluminum and utilizing pulsed chronoamperometric electrodeposition, structured cobalt-nickel catalysts were prepared, showing 1.5 times higher catalytic activity compared to porous nickel foam, with only 0.57 wt% cobalt content. The structured cobalt-nickel catalyst exhibited higher stability than the porous nickel foam even after an accelerated durability test.
APPLIED SURFACE SCIENCE
(2021)
Article
Environmental Sciences
Xinmin Liu, Yanjie Niu, Yuqing Huang, Xuexia Qiu, Qingjie Guo
Summary: Two new types of solid adsorption materials were prepared from waste television plastics and used to capture CO2 in flue gas from coal-fired power plants. The results showed that these materials had different CO2 adsorption capacities and mechanisms.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Engineering, Chemical
Huifen Kang, Jingjing Ma, Xintong Guo, Ziheng Han, Jian Hao, Qingjie Guo
Summary: This study investigated the emissions and migration of selenium using an iron-based oxygen carrier in chemical looping combustion. The results showed that the presence of the oxygen carrier significantly reduced the emissions of selenium and promoted its conversion from gaseous form to solid form. Additionally, the temperature of the fuel reactor and the number of oxygen carrier re-oxidation cycles played a crucial role in the emissions and retention of selenium.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Energy & Fuels
Mei An, Qingjie Guo, Xianyong Wei
Summary: The reaction mechanism of H2S and Hg0 on CuFe2O4 with oxygen vacancy structure was investigated using X-ray photoelectron spectroscopy (XPS) characterization and Density Functional Theory (DFT) calculations. The results showed that oxygen vacancies enhanced the adsorption capacity of CuFe2O4 towards Hg, H2S, and HgS, and improved the energy barrier and thermodynamic stability of key intermediates.
Article
Green & Sustainable Science & Technology
Hongjing Tian, Yixing Che, Shengnan Xu, Jixing Tang, Hui Wang, Man Wu, Qingjie Guo
Summary: The catalysts using cobalt ferrite (CoxFe(3-x)O(4)) and sphere mesoporous silica (MCM-41) nanoparticles as support were found to enhance the oxidation rate of MgSO3 under moderate temperatures. The combination of electric field and CoFe2O4/MCM-41 showed a synergistic effect, significantly increasing the oxidation rate of MgSO3 compared to when only one factor was present. The study also revealed the mechanism of the catalytic oxidation of MgSO3, involving the reduction of oxidation potential and increased electron transfer rate.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Materials Science, Multidisciplinary
Cheng Zuo, Xishi Tai, Qian Su, Zaiyong Jiang, Qingjie Guo
Summary: In the field of photocatalysis, loaded photocatalyst offers advantages of controlled morphology, uniform preparation, low cost, and easy recovery, making it a potential substitute for powder photocatalysts. In this study, TiO2 and Cu7S4 hybrid materials with oxygen vacancies grown on copper mesh were prepared. The enhanced photocatalytic performance of the material can be attributed to the synergistic effect between the interfacial electric field of the heterostructure and the abundant oxygen vacancies. This research provides insights into the design of S-scheme photocatalysts for efficient nitrogen reduction.
Article
Engineering, Chemical
Zhuangmei Li, Ying Zhu, Na Li, Hui Zhang, Yuhua Wu, Ping Li, Qingjie Guo, Hongcun Bai
Summary: Understanding the reactive mechanism of coal thermochemical conversion is crucial for the efficient utilization of coal. However, the evolution of coal macromolecular structure, reactants, and products at particle and molecular scales remains unclear. This study used reactive force field molecular dynamics to uncover the reactive mechanism and nitrogen transformation during the combustion of HSW coal at microscopic scales. The effects of chemical equivalent and combustion temperature were investigated to explore the structural evolution, combustion reactants, and products. The results revealed observable changes in coal structure fracture during the continuous reaction. Furthermore, the study established the transformation networks of organic nitrogen in combustion and identified the pathway for the formation of HCN, NO, and NO2.
Article
Engineering, Chemical
Yunlei Zhao, Bo Jin, Zhineng Zhang, Kun Huang, Yakun Wang, Xiao Luo, Qingjie Guo, Zhiwu Liang
Summary: Using self-templated metal-organic framework (MOF) to develop efficient iron-based oxygen carriers is an effective way, but the effect of metal oxide-support interaction and crystal structure on the reactivity of MOF-derived iron-based materials is still unclear.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Hui Huang, Zhaoxi Wei, Qingru Ge, Qingjie Guo
Summary: This study focuses on 278 cities in China from 2000 to 2017 and uses the SBM model to measure carbon emission efficiency. The results show that the average carbon emission efficiency in China gradually dropped from 0.6 to 0.5 during the research period. The classification of cities based on carbon emission efficiency reveals a decrease in high-efficiency cities and an increase in medium-low- and low-efficiency cities. The spatial-temporal evolution of carbon emission efficiency follows a certain pattern and has spatial auto-correlation. The study also identifies factors such as improving urban development quality and technological innovation, government intervention, and attracting high-quality foreign capital to improve the low efficiency of carbon emissions in cities.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Engineering, Chemical
Ziheng Han, Huifen Kang, Nini Yuan, Xintong Guo, Jingjing Ma, Qingjie Guo
Summary: Selenium pollution from coal utilization is a growing concern. Calcium-iron oxygen carriers and alkali metal ions have inhibitory effects on selenium, reducing its emissions. The retention mechanisms of selenium by Fe2O3, CaFe2O4, Ca2Fe2O5, and bottom ash were investigated. Iron-based oxygen carriers can oxidize H2Se(g) to SeO2(g) and release lattice oxygen to form an Fe-O-Se structure and retain selenium. CaFe2O5 showed the highest retention rate of 32.301%. Bottom ash gradually increased selenium retention, with alkali metal ions playing a crucial role. This study provides a new approach to selenium removal using oxygen carriers and bottom ash during chemical looping gasification.
Article
Chemistry, Physical
Wenlong Song, Qiqi Zhu, Kangzhou Wang, Rui Zhu, Qingxiang Ma, Tiansheng Zhao, Qingjie Guo, Xinhua Gao, Jianli Zhang
Summary: This study reports the positive role of residual sodium on the structural properties and catalytic performance of FeAlNa catalysts for olefins synthesis. The residual sodium improves the reduction behavior of Fe species and CO adsorption, inhibits secondary hydrogenation, and also inhibits the interaction between Fe and Al. The modified catalyst achieves a high olefins/paraffins ratio and low CH4 selectivity.
Article
Chemistry, Multidisciplinary
Mengdong Nie, Aixin Cui, Man Wu, Tuo Guo, Qingjie Guo
Summary: This study elucidates the correlation of metal-support interactions in CuO/LaCeOx catalysts and the promotion of catalytic activity. It is found that the introduction of La enhances the conversion of Ce4+ into Ce3+ in the catalyst and activates the formate reaction pathway of CO2 hydrogenation.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Engineering, Environmental
Chenglong Wang, Lerao Wang, Xumei Tao, Liang Huang, Zaiqing Yang, Qingjie Guo
Summary: Fe-MOFs@Fe2O3 composites were prepared using BDB plasma method with recycle of waste PET, showing high specific surface areas and a low electron-hole complexation rate. These composites exhibited good photocatalytic performance, degrading 99.3% of malachite green within 30 min under visible light. This method provides a new approach for recycling waste PET plastics and preparing new energy functional materials.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Zhaoxin Wan, Xiude Hu, Chengbo Li, Jiawei Zhang, Qi Wang, Long Fang, Linlin Zhang, Qingjie Guo, Deshuai Sun
Summary: SO2 and NO, the main precursors of acid rain, regional haze, and photochemical smog from coal combustion, can be simultaneously removed through advanced oxidation strategies. Two metal-organic frameworks (MOFs), FeBDC and CuFeBDC, were synthesized to activate peroxymonosulfate (PMS) for the oxidation and absorption of flue pollutants. CuFeBDC exhibited efficient catalytic properties for the removal of NO and SO2 in PMS solution and could be recycled and regenerated.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Liangliang Meng, Ying Zhu, Meilin Zhu, Ge Wu, Wenqian Guo, Chang Geng, Na Li, Rou Feng, Hui Zhang, Qingjie Guo, Hongcun Bai
Summary: Uncovering the reaction mechanism of various fuels to chemical looping combustion (CLC), especially depolymerization of solids in a complex environment, is an important scientific issue. This work presents molecular insights into the reaction behaviors and mechanism for several aromatic structures in the fuel reactor of CLC. It is found that the reaction process of aromatic fuels reacted with Fe2O3 as oxygen carriers in CLC can be divided into four stages, and the decomposition rate of fuel molecules is relevant to the reaction temperature and aromatic sizes.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Chemistry, Multidisciplinary
Mengdong Nie, Tuo Guo, Fangyuan Qiang, Man Wu, Yongzhuo Liu, Qingjie Guo, Yurong He
Summary: Controlling the metal-support interaction is crucial for the construction of efficient catalytic systems. In this study, different Cu-CeOx interactions were achieved by preparing CuO/MnCeOx catalysts with varying Mn content. The influence of Mn content on the performance of the catalysts during CO2 hydrogenation to CH3OH was analyzed, and the optimal Mn content was determined to be 20%. The catalyst with 20% Mn content (CuO/Mn0.2CeOx) showed the best catalytic behavior, with a methanol space-time yield of 0.25 gCH3OH gcat-1 h-1 at 260 degrees C. It had the highest concentration of oxygen vacancies and Cu0, as well as medium-to-strong basic sites, which were generated by the strongest metal-support interactions between CuO and MnCeOx solid solution. In situ diffuse reflectance infrared Fourier-transform spectroscopy evidence indicated that the CO2 methanolization over CuO/MnCeOx catalysts proceeded via a formate mechanism. These findings are highly significant for the development of new, efficient CO2 hydrogenation catalysts by controlling oxygen vacancies and surface basic sites through rational alteration of the metal-support interaction.
REACTION CHEMISTRY & ENGINEERING
(2023)
