Article
Chemistry, Multidisciplinary
J. M. Serra, M. Balaguer, J. Santos-Blasco, J. F. Borras-Morell, B. Garcia-Banos, P. Plaza-Gonzalez, D. Catalan-Martinez, F. Penaranda-Foix, A. Dominguez, L. Navarrete, J. M. Catala-Civera
Summary: This study investigates microwave-induced redox transformations on solid-state ion-conducting materials, and finds that reduction is triggered at a specific temperature leading to a significant increase in electric conductivity. The effectiveness of the redox process is influenced by material composition, gas environment, and microwave power intensity, with fine-grained materials showing amplified effects.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Andre L. A. Marinho, Raimundo C. Rabelo-Neto, Florence Epron, Nicolas Bion, Fabio B. Noronha, Fabio Souza Toniolo
Summary: The Pt@CeO2 and Pt@CeZrO2 catalysts were found to have a significant impact on the carbon removal mechanism in dry reforming of methane, due to their higher presence of reactive oxygen species, making them more resistant to coke formation.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Physical
Zhifeng Hu, Zhenwu Miao, Jiawei Wu, Enchen Jiang
Summary: Ni/Fe modification of natural ores can improve the reactivity and stability of oxygen carrier for chemical looping steam methane reforming (CL-SMR), enhancing performance and inhibiting agglomeration, with the optimum steam to OC ratio being 0.05. The high ratio of iron to nickel may lead to sintering and decline in OC performance, while the optimal CH4 to OC ratio for highest performance is 0.04.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Theodoros Papalas, Evangelos Palamas, Andy N. Antzaras, Angeliki A. Lemonidou
Summary: This study successfully synthesized bimetallic Ni-Co oxygen carriers with ZrO2 as a structure stabilizer using a one-pot sol-gel auto-combustion method. The redox properties and catalytic activity of the reduced state were evaluated, showing that the reduced bimetallic materials exhibited higher reforming activity and stability compared to monometallic materials, with Co addition promoting the oxidation kinetics.
Article
Engineering, Environmental
Wei-Hsin Chen, Kuan-Hsiang Chen, Aristotle T. Ubando, Wen-Jhy Lee, Man -Hin Chio
Summary: Chemical looping combustion (CLC) using iron-based oxygen carriers can efficiently capture carbon dioxide and produce high yields of CO2 and H2O under specific operating conditions. Fe3O4 and Fe2O3 are the major components of iron in OCs during most reduction and oxidation reactions. Decreasing oxygen input leads to increased carbon formation in the system.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Jason Sun, Doki Yamaguchi, Liangguang Tang, Selvakannan Periasamy, Hongyang Ma, Judy N. Hart, Ken Chiang
Summary: This study investigated the influence of oxygen exchanging capability on the catalytic activity of methane dry reforming. The results showed that a small loading amount of Ru onto ceria-zirconia catalyst increased its oxygen mobility and catalytic activity, leading to high conversions of methane and carbon dioxide.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Weidong Sun, Ya Gao, Guofeng Zhao, Jiaqi Si, Ye Liu, Yong Lu
Summary: In this study, CexZr1-xO2 solid solutions modified with Mn2O3-Na2WO4 were used as catalysts for OCM. The effects of Ce/Zr ratio and Mn2O3-Na2WO4 doping on catalyst reactivity were investigated, with the catalyst with a Ce/Zr molar ratio of 0.15/0.85 showing promising activity and selectivity. The doped Ce0.15Zr0.85O2 catalyst was found to generate more O-2(-) species, leading to improved activity and selectivity at lower reaction temperatures.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Applied
Sherafghan Iftikhar, William Martin, Yunfei Gao, Xinbin Yu, Iwei Wang, Zili Wu, Fanxing Li
Summary: The study investigates LaFe1_xNixO3_delta redox catalysts for CO2 utilization and production of syngas. Different compositions of LaFe1_xNixO3_delta were prepared and tested, showing favorable reactive performance. The flexibility of the catalysts to produce syngas or hydrogen with tunable compositions depends on the iron/nickel ratio. The stability and performance of the redox catalysts were proven over multiple cycles.
Article
Engineering, Environmental
Yuanqing Ding, Yanyan Jia, Mingxiang Jiang, Yanglong Guo, Yun Guo, Li Wang, Qingping Ke, Minh Ngoc Ha, Sheng Dai, Wangcheng Zhan
Summary: The structure of CeO2-ZrO2 mixed oxides support significantly affects the catalytic activity of Pd/CZ catalysts in methane combustion, with CZ oxides featuring a two-phase composite structure exhibiting higher oxygen storage capacity and mobility, positively impacting the performance of Pd/CZ catalysts.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Kun Zhao, Rongjiang Zhang, Yunfei Gao, Yan Lin, Anqi Liu, Xiaobo Wang, Anqing Zheng, Zhen Huang, Zengli Zhao
Summary: This study investigated the use of perovskites as oxygen carriers for chemical looping steam methane reforming, finding that La0.95Ce0.05Ni0.2Fe0.8O3 and La0.95Ce0.05-Ni0.5Fe0.5O3 showed high efficiency in methane partial oxidation and steam splitting, potentially simplifying the separation step for pure hydrogen acquisition.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Brett Pomeroy, M. Grilc, B. Likozar
Summary: This research demonstrates the remarkable versatility of a ceria-promoted transition metal catalyst for the hydrogenation of 5-hydroxymethylfurfural (HMF). By simply modifying the reaction conditions and/or using a water-containing process medium, significant selective yields of three important high-value HMF-derived compounds can be achieved.
Article
Chemistry, Applied
Jun Hu, Shiyi Chen, Wenguo Xiang
Summary: This study investigated the influence of different promoters (Ni, Co, and Cu) on Fe-based oxygen carriers, finding that promoters can enhance oxygen activity and CH4 conversion rate. Ni-promoted oxygen carriers showed the highest CH4 conversion rate and H2 yield.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Sherafghan Iftikhar, William Martin, Xijun Wang, Junchen Liu, Yunfei Gao, Fanxing Li
Summary: This study reports the use of AxA '1-xByB '1-yO3-delta perovskite oxide materials as redox catalysts for CO2 splitting and methane partial oxidation. DFT calculations and experimental investigation were used to optimize and validate the performance of these catalysts. Impregnation of 1 wt% ruthenium was found to significantly improve the redox kinetics, and air treatment was effective in reactivating the catalyst. The study provides a strategy for CO2 utilization and suggests approaches to enhance the redox kinetics and long-term catalyst performance.
Article
Energy & Fuels
Marina Arapova, Ekaterina Smal, Yuliya Bespalko, Konstantin Valeev, Valeria Fedorova, Amir Hassan, Olga Bulavchenko, Vladislav Sadykov, Mikhail Simonov
Summary: This paper focuses on the exploration of active and stable nickel catalysts for methane dry reforming using Pr-doped ceria-zirconia obtained via the solvothermal continuous method. It is found that the introduction of Pr increases the amount of highly reactive oxygen in the oxide lattice, leading to significantly higher reactant conversions. The method of nickel introduction has a significant impact on the morphology of the particles, Ni-support interaction, catalytic activity, and coking stability.
Article
Chemistry, Physical
Mayankkumar L. Chaudhary, Ahmed S. Al-Fatesh, Rawesh Kumar, Mahmud S. Lanre, Francesco Frusteri, Salwa B. AlReshaidan, Ahmed A. Ibrahim, Ahmed E. Abasaeed, Anis H. Fakeeha
Summary: The idea of hydrogen production through dry reforming of methane (DRM) is excellent for decreasing greenhouse gas concentration. The addition of ceria to the yttria-zirconia supported nickel catalyst enhances its catalytic activity. The addition of 2 wt% ceria reduces the crystallinity of metallic nickel, increases the CH4 decomposition sites and oxygen mobility, resulting in a 79% H2 yield.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Biotechnology & Applied Microbiology
Nardev Kumar Bajaj, Selvakannan Periasamy, Ranjeet Singh, Yasuhiro Tachibana, Torben Daeneke, Ken Chiang
Summary: Our recent study focused on the use of a zinc-modified NaY zeolite for decomposing CO2 at temperatures ranging from 300 to 550 degrees Celsius. At a reaction temperature of 450 degrees Celsius, we observed 70% conversion of CO2 with a minimal amount of CO produced. Analysis using scanning electron microscopy and Fourier transform infrared spectroscopy confirmed the presence of carbon nanostructures on the catalysts after the reaction. Additionally, CHN analysis revealed a carbon weight percent of 0.73 wt% after the reaction, supporting the results. The catalyst's stability was also confirmed with little to no change in X-ray diffraction technique. This study suggests a promising strategy for achieving CO2 decomposition and sheds light on the formation of carbon on zinc-modified zeolite catalysts.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Chemical
Jason Sun, Doki Yamaguchi, Liangguang Tang, Selvakannan Periasamy, Hongyang Ma, Judy N. Hart, Ken Chiang
Summary: This study investigated the influence of oxygen exchanging capability on the catalytic activity of methane dry reforming. The results showed that a small loading amount of Ru onto ceria-zirconia catalyst increased its oxygen mobility and catalytic activity, leading to high conversions of methane and carbon dioxide.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Karma Zuraiqi, Ali Zavabeti, Jonathan Clarke-Hannaford, Billy James Murdoch, Kalpit Shah, Michelle J. S. Spencer, Chris F. McConville, Torben Daeneke, Ken Chiang
Summary: This study reports a method for the direct conversion of CO2 to solid carbon utilizing EGaIn liquid metal alloy. The method allows for low-temperature reduction of CO2, producing highly selective solid carbon. The generated carbon naturally accumulates on the top of the alloy, making it easy to collect.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
Kalpit Shah, Savankumar Patel, Pobitra Halder, Sazal Kundu, Mojtaba Hedayati Marzbali, Ibrahim Gbolahan Hakeem, Biplob Kumar Pramanik, Ken Chiang, Tejas Patel
Summary: Converting low-value plastic waste into high-value carbon nanotubes using biochar catalyst is a sustainable approach. By investigating different growth temperatures and biochar particle sizes, production of hydrogen and carbon nanotubes yield can be optimized.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Omvir Singh, Ankit Agrawal, Neha Dhiman, Bhanu Prasad Vempatapu, Ken Chiang, Shailendra Tripathi, Bipul Sarkar
Summary: The study investigated the transformation of jatropha oil into aromatics using bimetallic ZSM-5 catalyst in a continuous downflow reactor. The addition of Ce as a promoter was found to enhance dehydrodeoxygenation reaction and aromatic selectivity. The optimized catalyst 10Zn5Co5Ce/Z showed high conversion and aromatic selectivity with negligible coke deposition.
Article
Energy & Fuels
Tarabordin Yurata, Liangguang Tang, Yuqing Feng, Doki Yamaguchi, Seng Lim, Peter Witt, Pornpote Piumsomboon, Benjapon Chalermsinsuwan
Summary: This study simulated the gas solid flow behavior in a chemical looping hydrogen production process and investigated the effect of drag coefficient models on the pressure distribution in each reactor, with results agreeing well with experimental data. The research also found that operating parameters, such as inlet velocity and solid inventory, have an impact on the hydrodynamics profiles of each reactor, affecting the solid flux.
Article
Nanoscience & Nanotechnology
Karma Zuraiqi, Caiden J. Parker, Ali Zavabeti, Andrew J. Christofferson, Subashani Maniam, Chris F. McConville, Ken Chiang, Torben Daeneke
Summary: This study demonstrates a novel surfactant-driven synthesis method for sub-50-nm liquid metal droplets, avoiding the adverse effects of high-power sonication on size distribution. By modifying the composition of the liquid metal droplet's core, functional liquid metal nanodroplets with tailored properties can be generated.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Chemical
Svatopluk Chytil, Chao'en Li, Woo Jin Lee, Rune Lodeng, Anders Holmen, Edd A. Blekkan, Nick Burke, Jim Patel
Summary: The upgrading of biosyngas to convert methane into syngas is a crucial step for hydrogen production from biomass. This study investigates the thermal treatment of a model biosyngas and examines the effects of various variables on the reaction. The proposed reaction mechanism involves dry reforming of methane, reverse water-gas shift reactions, and methane pyrolysis. Additionally, the study reveals the presence of SiO2 species as a support for carbon formation, resulting from the chemical reaction between the reactor wall material and the reactants.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Fitri Widhiastuti, Linhua Fan, Jorge Paz-Ferreiro, Ken Chiang
Summary: The combination of Fe(VI) and H2O2 exhibited synergistic effect in degrading BPA in ROC, achieving higher degradation efficiency. Optimized degradation was achieved by adjusting operating conditions, including dosage, dosing strategy, pH, and initial concentration. Simultaneous addition of Fe(VI) and H2O2 provided satisfactory degradation of BPA.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Energy & Fuels
Nazia Siddiqui, Chandrashekar Pendem, Reena Goyal, Rubina Khatun, Tuhin S. Khan, Chanchal Samanta, Ken Chiang, Kalpit Shah, M. Ali Haider, Rajaram Bal
Summary: In this study, well dispersed nanocrystalline PtHT catalyst was successfully prepared, and it showed excellent performance for the hydrogenation of levulinic acid to produce gamma-valerolactone at low temperature. The highly dispersed metallic Pt was found to be the active species responsible for achieving good conversion and selectivity of gamma-valerolactone even at room temperature. Additionally, the catalyst exhibited high stability and recyclability during the hydrogenation process.
Article
Chemistry, Analytical
Ibrahim Gbolahan Hakeem, Pobitra Halder, Charles Chinyere Dike, Ken Chiang, Abhishek Sharma, Jorge Paz-Ferreiro, Kalpit Shah
Summary: This study provides an overview of the development and research progress in biosolids pyrolysis, discussing the effects of pre-treatment, catalysts, and co-processing on the pyrolysis process. Chemical pre-treatment, catalyst additives, and co-feeding can improve product selectivity, yield, and distribution of value-added chemical components in the bio-oil. These findings are significant for the valorisation of biosolids.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Biotechnology & Applied Microbiology
Fitri Widhiastuti, Linhua Fan, Jorge Paz-Ferreiro, Ken Chiang
Summary: In water, Fe(VI)/H2O2 showed significantly better degradation of BPA compared to Fe(VI) or H2O2 alone. The initial concentration of BPA and background anions had an impact on the degradation efficiency of the combined oxidants, with Cl- and NO3- ions showing no significant effect on BPA degradation, while PO43- ions significantly reducing the efficiency. Three degradation pathways were proposed, and a reduction in ecotoxicity was observed after 60 minutes of reaction for both Fe(VI) and Fe(VI)/H2O2.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Energy & Fuels
Keelan T. O'Neill, Saif Al Ghafri, Bruno da Silva Falcao, Liangguang Tang, Karen Kozielski, Michael L. Johns
Summary: Liquid hydrogen is a potential storage medium for large-scale hydrogen transportation. The operation of cryogenic plate-fin heat exchangers in hydrogen liquefaction is explored, considering the coupled processes of spin-isomer conversion, heat transfer, and pressure loss.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Environmental
Fitri Widhiastuti, Linhua Fan, Jorge Paz-Ferreiro, Ken Chiang
Summary: The study demonstrated that Fe(VI) is highly effective in degrading BPA in ROC, with the degradation rate varying with different operating conditions, but showing significant results under specific conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
