Article
Environmental Sciences
Yingni Yu, Yingju Yang, Jing Liu, Junyan Ding, Junying Zhang
Summary: A highly-efficient sorbent, Cu-In spinel-type sulfides, was synthesized through a hydrothermal synthesis and showed excellent mercury removal performance at low temperatures. The mercury removal efficiency significantly improved as the Cu proportion increased, with CuInS2 sorbent reaching 99.6% removal efficiency at 125 degrees C. The study demonstrated a potential for applying CuxIn2-xS2 sorbents to capture gaseous mercury at low temperature.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Energy & Fuels
Hongman Sun, Yehong Wang, Shaojun Xu, Ahmed I. Osman, Gavin Stenning, Jianyu Han, Shuzhuang Sun, David Rooney, Paul T. Williams, Feng Wang, Chunfei Wu
Summary: The distance between Ni active sites and CaO sorbents is crucial for the performance of the ICCU process, with closer distances leading to lower CO2 conversion and CH4 selectivity. By increasing the distance through physical mixing, the CO2 conversion and CH4 selectivity can be greatly improved.
Article
Chemistry, Applied
Minkyu Kim, Boseok Seo, Jinho Boo, Huiju Jung, No-Kuk Park, Ho-Jung Ryu, Jeom-In Baek, Misook Kang, Sung Bong Kang, Dohyung Kang
Summary: Chemical looping combustion technology is a popular research topic due to its ability to efficiently convert fossil fuels into sustainable energy with carbon capture. This study focused on the methane oxidation on Mn-Cu bimetallic oxygen carriers and explored the effects of dopants on their performance. Computational and experimental results showed that Ni-doped CuMn2O4 improved the oxygen transfer rate, while V-doped CuMn2O4 had a lower rate due to hindered oxygen migration. These findings highlight the importance of considering dopants' effects on oxygen migration when designing enhanced oxygen carriers.
Article
Chemistry, Physical
Balasubramanian Jansi Rani, Arumugam Sivanantham, Tatachari Santhanagopalan Shridharan, Tan Runfa, In Sun Cho
Summary: Facet engineering, specifically the synthesis of faceted CuMn2O4 nanoparticles, enhances the electrocatalytic water splitting activity by exposing desired crystal planes and introducing oxygen vacancies. The f-CMO nanoparticles showed superior hydrogen evolution reaction activity compared to non-f-CMO nanoparticles, demonstrating the importance of facet formation in developing efficient electrocatalysts for water splitting.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Ruixue Fang, Feng Liu, Jing Liu, Yu Li
Summary: Chemical-looping combustion is considered a promising technology for low-cost CO2 separation. CuMn2O4, combining Cu and Mn into a spinel matrix, exhibits superior reactivity compared to Mn2O3 in the oxidation of CO. Experimental and theoretical studies support the improved performance of CuMn2O4, showing that the presence of Cu enhances its reactivity in CO oxidation reactions.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Yang Peng, Churong Huang, Jingle Huang, Min Feng, Xinzhuo Qiu, Xin Yue, Shaoming Huang
Summary: Spinel oxides, known for their faster kinetics and outstanding catalytic performance, have the potential to be used as non-precious metal electrocatalysts for oxygen evolution reaction (OER). This study focuses on regulating the geometric structures of spinel oxides to enhance their OER performance. By filling the unoccupied octahedral interstices with foreign Fe cations, the synthesized HOoct-NFO NC/IF electrocatalysts show excellent OER performance with faster kinetics and superior stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Jakub Cespiva, Marek Jadlovec, Jan Vytisk, Jana Serencisova, Ochodek Tadeas, Stanislav Honus
Summary: The scope of this paper is to investigate the utilization of gasification char (GC) as a sorbent material for capturing mercury from coal combustion flue gas. The aim of the study is to determine the absorption capacities of GC produced from softwood pellets (SWP) and solid recovered fuel (SRF), and evaluate the influence of particle size and hot steam activation. Promising results were obtained with 0.5-2 mm particle size and hot-steam activation, reaching mercury removal efficiencies of 76.5% for SWP GC and 62.3% for SRF GC. This study suggests a promising approach for waste utilization in the energy sector, contributing to the sustainability of the circular economy and addressing environmental concerns.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Chemistry, Physical
Shashikant A. Kadam, Stefania Sandoval, Zdenek Bastl, Karolina Simkovicova, Libor Kvitek, Juraj Jasik, Joanna Elzbieta Olszowka, Stanislav Valtera, Mykhailo Vaidulych, Jaroslava Moravkova, Petr Sazama, David Kubicka, Arnaud Travert, Jeroen A. van Bokhoven, Alessandro Fortunelli, Armin Kleibert, Martin Kalbac, Stefan Vajda
Summary: In this study, the cyclohexane oxidative dehydrogenation (ODH) catalyzed by cobalt ferrite nanoparticles supported on reduced graphene oxide (RGO) was investigated. The active sites responsible for full and partial dehydrogenation were identified using advanced spectroscopic techniques and kinetic analysis. The study revealed the cooperativity between different sites and the role of the support in controlling the abundance of undesired active sites.
Article
Engineering, Environmental
Ruicheng Fu, Yingchao Hu, Wenxia Wang
Summary: This study addresses the issues of powder elutriation and low sorption performance in Li4SiO4-based CO2 sorbents through the use of an alginate-assisted technique. The technique successfully improves the granulation and performance of the sorbents, making them suitable for practical application in CO2 capture. The addition of Li2CaSiO4 in the synthesis process enhances the sorption capacity of the Li4SiO4 sorbents, and a proposed sorption model explains the mechanism behind this enhancement.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Mingchun Li, Cunliang Shen, Jie Ji, Laishi Li, Yusheng Wu
Summary: Highly reactive CaO sorbents based on natural limestone with enhanced stability and re-usability were obtained through a pre-sintering-hydration method. These sorbents exhibited high CO2 capture capacity, improved cycle stability, and the ability to maintain a high capture capacity after multiple cycles. The improved properties can be attributed to the active mechanisms introduced by the pre-sintering-hydration treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xiuzhong Fang, Rui Zhang, Yingao Wang, Menghe Yang, Yanfang Guo, Mingming Wang, Jian Zhang, Junwei Xu, Xianglan Xu, Xiang Wang
Summary: The Ni-Al spinel catalysts treated by DBD plasma exhibit stronger interaction between NiO/Ni particles and supports, leading to smaller NiO/Ni grains sizes and higher metallic Ni active surface areas. Furthermore, the plasma treatment results in decreased acidity and increased surface active oxygen sites of the catalysts, which in turn improve catalytic activities and coke resistance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Chemistry, Physical
Xueqi Zhang, Alex C. K. Yip, Shusheng Pang
Summary: This review discusses the investigation of active metal-based materials (AMMs) as CO2 sorbents or oxygen carriers (OCs) to enhance hydrogen production in biomass-based chemical looping processes. CaO-based sorbents and Fe-based OCs are widely used in this field, and this review focuses on these two types of materials. CaO-based sorbents promote the water-gas shift reaction for H2 generation with in-situ CO2 removal, while OCs oxidize biomass to release CO, a reactant in the water-gas shift reaction. Fe-based OCs enhance H2 yield through iron-steam reactions. AMMs have catalytic activity for tar cracking, generating more H2. However, sintering over cycles limits their industrial-scale utilization, which is addressed by the addition of support materials. The review assesses the impacts of CaO sorbents and OCs on H2 production, examines material behavior, cyclic performance, and applications in biomass-based chemical looping processes, and proposes the mechanism of support materials as reactivity enhancers and sintering inhibitors. The effects of operating conditions on H2 yield are summarized in Supplementary materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Yuxuan Lu, Tianyang Liu, Chung-Li Dong, Chunming Yang, Ling Zhou, Yu-Cheng Huang, Yafei Li, Bo Zhou, Yuqin Zou, Shuangyin Wang
Summary: The electrooxidation of 5-hydroxymethylfurfural (HMF) provides a green route to obtain high-value chemicals from biomass. The study reveals the adsorption behavior of HMF and OH- on Co3O4, with oxygen vacancy playing a crucial role. Modulating adsorption sites leads to excellent activity for the HMFOR process.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xin Yue, Xueping Qin, Yangdong Chen, Yang Peng, Caihong Liang, Min Feng, Xinzhuo Qiu, Minhua Shao, Shaoming Huang
Summary: By constructing more octahedral sites with high OER activities, this state-of-the-art spinel oxide electrocatalyst exhibits excellent OER catalytic activity and fast kinetics. Additionally, it demonstrates superior durability by maintaining an OER activity of 250 mA cm(-2) for 1000 hours.
Article
Chemistry, Multidisciplinary
Mahmoud Gamal Ahmed, Ying Fan Tay, Xiao Chi, Mengyuan Zhang, Joel Ming Rui Tan, Sing Yang Chiam, Andrivo Rusydi, Lydia Helena Wong
Summary: The discovery of a highly efficient and stable catalyst for oxygen evolution reaction (OER) using high-throughput methods is summarized. The catalyst exhibits remarkable catalytic activity due to the formation of multiple active sites and active oxyhydroxide phase. This work contributes to the rapid identification of new catalysts and the improvement of greener fuel.
