Article
Chemistry, Physical
Sanghun Lee, Jaemyung Lee, Taehong Kim, Gwangwoo Han, Jaeseok Lee, Kangyong Lee, Joongmyeon Bae
Summary: In this study, Pt/CeO2 catalyst exhibited a much faster dehydrogenation rate of H18-DBT compared to Pt/Al2O3. The slower dehydrogenation rate of Pt/Al2O3 was attributed to the slow mass transport of liquid H18-DBT into the catalyst pores due to the small pores present in Pt/Al2O3.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yeongin Jo, Tae Wan Kim, Jinho Oh, Donghyeon Kim, Young-Woong Suh
Summary: The addition of sulfur to supported Pt catalysts has an impact on Pt defect sites and side reactions, which is influenced by the catalyst preparation methods. In this study, mesoporous sulfur-decorated Pt-Al2O3 catalysts with different sulfur contents were prepared using the solvent-deficient precipitation (SDP) method. The dehydrogenation of perhydro benzyltoluenes showed a volcano-shaped dependence on the sulfur content, with the maximum dehydrogenation achieved at 0.21 wt% sulfur. The best performing catalyst exhibited excellent recyclability due to negligible Pt growth and sulfur loss. The SDP method facilitated favorable contact between Pt and sulfur species, resulting in a reduction in electron density of Pt atoms. This electron-deficient Pt atoms weakened the adsorption of aromatic products and facilitated appropriate H-2 adsorption. As a result, the titled catalyst exhibited tolerance towards dehydrogenation products and lower selectivity towards the side product methylfluorene.
JOURNAL OF CATALYSIS
(2022)
Article
Energy & Fuels
Ahsan Ali, Ajith Krishnan Rohini, Young Su Noh, Dong Ju Moon, Hee Joon Lee
Summary: The study explores the hydrogenation of dibenzyltoluene and the dehydrogenation of perhydro-dibenzyltoluene (H18-DBT), finding optimal conditions for both reactions. Different loadings of Pt on Al2O3 catalysts are tested for dehydrogenation, with 5% Pt/Al2O3 proving to be the most effective in storing and releasing hydrogen. Cyclic experiments show the stability of DBT over multiple cycles.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Kwanyong Jeong, Sunil Kwon, Hyunwoo Yook, Jeong Jae Lee, Ju Seong Lee, Myungho Choi, Hyung Seob Lim, Sang-Joon Kim, Soo Min Kim, Jeong Woo Han, Ji Hoon Park
Summary: Liquid organic hydrogen carrier (LOHC) technology enables safe and convenient storage and transportation of hydrogen in large quantities. This study proposes a promising LOHC candidate, 1-(n-phenylethyl)naphthalene (PEN), which exhibits high hydrogen storage capacity, superior physical properties, and low cost. PEN showed reversible hydrogen storage and release performance, and the dehydrogenation performance can be enhanced by controlling the composition of stereo isomers.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Environmental
Hanh My Bui, Paula F. Grossmann, Anne Berger, Alexander Seidel, Markus Tonigold, Normen Szesni, Richard Fischer, Bernhard Rieger, Olaf Hinrichsen
Summary: Two additive manufacturing techniques, Direct Ink Writing (DIW) and Binder Jetting (BJ), were compared for catalyst shaping. The supports made from 3D printed Al2O3 were impregnated with H3Pt(SO3)2(OH) and tested for dehydrogenation reactions. The results showed that BJ had higher meso- and macroporosity and could load more Pt.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Phillimon Modisha, Rudaviro Garidzirai, Hande Gunes, Selmi Erim Bozbag, Sarshad Rommel, Erdal Uzunlar, Mark Aindow, Can Erkey, Dmitri Bessarabov
Summary: Pt/Al2O3 catalysts prepared using the SCD method showed the best catalytic performance for the dehydrogenation of H18-DBT, attributed to the higher dispersion of Pt particles and smaller particle size. The deactivation was mainly caused by adsorbed H0-DBT blocking the active sites. The study revealed that improved catalyst performance led to increased production of liquid by-products and carbon materials.
Article
Materials Science, Multidisciplinary
Cecil N. M. Ouma, Kingsley O. Obodo, Phillimon M. Modisha, Dmitri Bessarabov
Summary: The controlled or optimized loading of sulfur on a catalyst surface has been found to enhance the catalytic activity. Additionally, Si, P and Se surface additives can also boost the catalytic activity of catalysts, similar to sulfur.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Chunguang Tang, Preetham Permude, Shunxin Fei, Terry J. Frankcombe, Sean C. Smith, Yun Liu
Summary: Understanding the atomistic steps during the dehydrogenation process of liquid organic hydrogen carriers (LOHCs) is crucial for designing efficient LOHC catalysts. Using density functional theory (DFT), we investigated the thermodynamics and kinetics of the complete dehydrogenation path of perhydro-N-ethylcarbazole (12H-NEC) on Ru(0001) surface. Our results suggest that more efficient dehydrogenation can be achieved by engineering the catalyst surface or using different catalyst materials, and possible dealkylation may occur at elevated temperatures.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Ahsan Ali, Ajith Krishnan Rohini, Hee Joon Lee
Summary: A preliminary study on the dehydrogenation of perhydro-dibenzyltoluene as a liquid organic hydrogen carrier was conducted, with a focus on switching from a stirred tank reactor to a continuous flow microchannel reactor. The results showed that the continuous flow microchannel reactor achieved a higher hydrogen production percentage compared to the stirred tank reactor. Moreover, increasing the bottom plate temperature had a positive effect on hydrogen production. The study also proposed a kinetic model for the dehydrogenation process in the microchannel reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Wenjie Xue, Hongxia Liu, Baohua Mao, Honglei Liu, Minghuang Qiu, Chengguang Yang, Xinqing Chen, Yuhan Sun
Summary: Hydrogen, a promising candidate to replace fossil fuels, faces challenges in storage. A new reusable bimetallic Pd-Rh nanoparticles (NPs) catalyst shows potential for high-weight% hydrogen storage. The mechanism proposed for NEC hydrogenation over the Pd-Rh catalyst opens avenues for the development of LOHCs as energy vectors.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Li Liu, Ting Zhu, Wenyu Han, Yuhang Ding, Yuan Dong, Ming Yang
Summary: Catalysts are crucial for the rapid dehydrogenation of Liquid Organic Hydrogen Carriers (LOHCs) for their large-scale application. A series of 1 wt% Pd/AlSiO catalysts with different Al/Si molar ratios were prepared and studied for the dehydrogenation of perhydro-N-propylcarbazole. The Al/Si molar ratios were found to significantly influence the catalyst's specific surface area, support acidity, metal reduction degree, and particle size. The Pd/AlSiO catalyst with an Al/Si molar ratio of 2:1 achieved 100% dehydrogenation of perhydro-N-propylcarbazole in 360 minutes and exhibited excellent cycle stability. The high activity of the Pd/AlSiO-2/1 catalyst was attributed to its high specific surface area, medium acidity, and small particle size (4.9 nm). Carrier modification proved to be an effective strategy for improving catalytic dehydrogenation activity.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Jingwen Zhou, Jin Suk Chung, Sung Gu Kang
Summary: This study systematically investigated the influence of doping M atoms onto Pt-based subsurface alloys and the application of biaxial strain on the electronic properties of Pt atoms, affecting hydrogen adsorption strength and the rate-determining step of dehydrogenation process. The results showed that doping and strain promotion could enhance dehydrogenation, and the correlation between d-band centers, reaction energies, and hydrogen adsorption energy suggested the practical descriptor of dehydrogenation activity.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Yeonsu Kwak, Seongeun Moon, Chang-il Ahn, Ah-Reum Kim, Yongha Park, Yongmin Kim, Hyuntae Sohn, Hyangsoo Jeong, Suk Woo Nam, Chang Won Yoon, Young Suk Jo
Summary: This study investigates the effect of the properties of commercial Al2O3 pellets on Pt/Al2O3 catalysts in the dehydrogenation reaction of H12-BPDM, demonstrating that pore size distributions and corresponding surface properties of Al2O3 supports can lead to different dehydrogenation reaction characteristics of H12-BPDM.
Article
Chemistry, Physical
Jun-Young Cho, Hahyeon Kim, Jeong-Eun Oh, Boyoung Y. Park
Summary: The article explores liquid organic hydrogen carriers (LOHCs) as a potential solution to global warming caused by increased use of fossil fuels, focusing on hydrogenation, dehydrogenation, and hydrogen mass production processes.
Article
Energy & Fuels
Tianyu Cao, WooJae Lee, Renjing Huang, Raymond J. Gorte, John M. Vohs
Summary: The cyclic molecule 1,2,3,4-tetrahydroquinoline (THQ) has been examined as a liquid-organic hydrogen carrier (LOHC) for endothermic fuel in hypersonic aircraft engines. It showed high conversion rates and stability, making it a potential alternative for endothermic cooling.
Article
Chemistry, Physical
Yuan Dong, Ming Yang, Linlin Li, Ting Zhu, Xuedi Chen, Hansong Cheng
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Applied
Ming Yang, Xile Xing, Ting Zhu, Xuedi Chen, Yuan Dong, Hansong Cheng
JOURNAL OF ENERGY CHEMISTRY
(2020)
Article
Chemistry, Physical
Chenghan Ding, Ting Zhu, Fanyi Wang, Zhiming Zhang, Yuan Dong, Ming Yang, Guoe Cheng, Hanzhong Ke, Hansong Cheng
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Xuedi Chen, Gen Li, Min Gao, Yuan Dong, Ming Yang, Hansong Cheng
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Peijie Li, Yuan Dong, Yuhang Ding, Heshun Zhang, Ming Yang, Hansong Cheng
Summary: The Ru-WO3 catalysts exhibit good catalytic activity in the hydrogenation of cyclohexene, and can achieve rapid hydrogen uptake of NPCZ at a lower metal loading and temperature due to the increase of reactive sites caused by hydrogen spillover.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yuhang Ding, Yuan Dong, Heshun Zhang, Yinheng Zhao, Ming Yang, Hansong Cheng
Summary: Reducing the cost and improving the catalytic activity of hydrogenation/dehydrogenation catalysts are essential for promoting the commercial application of LOHCs technology. The study introduced a highly adaptable Ni catalyst with high catalytic activity and stability for different LOHCs, showing potential for large-scale applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Chenggen Li, Qingyang Zhang, Zhenggang Xu, Li Liu, Ting Zhu, Zhiwen Chen, Yuan Dong, Ming Yang
Summary: In this work, a highly dispersed CeO2 nanoparticle-modified Pd/Al2O3 catalyst was prepared and applied for the reversible hydrogenation and dehydrogenation of N-propylcarbazole. The catalyst Pd/CeAl-20 exhibited better catalytic performance compared to the commercially available 1 wt% Pd/Al2O3 catalyst, achieving complete hydrogenation and dehydrogenation within 180 minutes. This study reveals the crucial role of combined promotion of the active site size and chemical microenvironment for N-heterocycle hydrogenation and dehydrogenation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Li Liu, Ting Zhu, Wenyu Han, Yuhang Ding, Yuan Dong, Ming Yang
Summary: Catalysts are crucial for the rapid dehydrogenation of Liquid Organic Hydrogen Carriers (LOHCs) for their large-scale application. A series of 1 wt% Pd/AlSiO catalysts with different Al/Si molar ratios were prepared and studied for the dehydrogenation of perhydro-N-propylcarbazole. The Al/Si molar ratios were found to significantly influence the catalyst's specific surface area, support acidity, metal reduction degree, and particle size. The Pd/AlSiO catalyst with an Al/Si molar ratio of 2:1 achieved 100% dehydrogenation of perhydro-N-propylcarbazole in 360 minutes and exhibited excellent cycle stability. The high activity of the Pd/AlSiO-2/1 catalyst was attributed to its high specific surface area, medium acidity, and small particle size (4.9 nm). Carrier modification proved to be an effective strategy for improving catalytic dehydrogenation activity.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Li Liu, Ting Zhu, Mengwei Xia, Yuanzheng Zhu, Hanzhong Ke, Ming Yang, Hansong Cheng, Yuan Dong
Summary: A comprehensive study was conducted to investigate the hydrogenation and dehydrogenation of dibenzyltoluene using different metal catalysts. The results showed significant variations in catalytic activity, with Rh/Al2O3 and Pt/Al2O3 demonstrating the highest activity for hydrogenation and dehydrogenation, respectively. The activation energies and purity of the produced hydrogen gas were also evaluated, providing valuable insights for developing efficient catalysts for liquid organic hydrogen carriers.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Li Liu, Ting Zhu, Chenggen Li, Yinheng Zhao, Ming Yang, Hanzhong Ke, Yuan Dong
Summary: This study presents 2,5-dimethylindole (2,5-DMID) as a promising liquid organic carrier (LOHC) for hydrogen storage. Through experiments and calculations, the study systematically investigates the hydrogen storage properties of 2,5-DMID and confirms its ability to produce high purity hydrogen gas under appropriate conditions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Ting Zhu, Ran Wang, Ziteng Chen, Feng Ji, Yuan Dong, Ming Yang
Summary: The problem of safe and efficient storage and transportation of hydrogen energy can be solved through liquid organic hydrogen storage technology. Researchers developed RuPd-based and supported catalysts and investigated their catalytic activities for hydrogenation and dehydrogenation. The Pd2.5Ru2.5/H-2 catalyst fabricated by the double reduction method exhibited excellent performance and recyclability.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yuan Dong, Haoming Zhao, Yinheng Zhao, Ming Yang, Heshun Zhang, Hansong Cheng
Summary: This report investigates 2,3-Dimethylindole as a new liquid organic hydrogen carrier, studying its hydrogenation and dehydrogenation processes under different conditions. The results show that efficient hydrogenation and dehydrogenation products can be achieved under appropriate temperature and pressure.
Article
Chemistry, Physical
Chenguang Li, Ming Yang, Zhenjie Liu, Zhenlin Zhang, Ting Zhu, Xuedi Chen, Yuan Dong, Hansong Cheng
CATALYSIS SCIENCE & TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Yuan Dong, Haoming Zhao, Zhenjie Liu, Ming Yang, Zhenlin Zhang, Ting Zhu, Hansong Cheng
