Article
Chemistry, Inorganic & Nuclear
Bendik Gromer, Susumu Saito
Summary: The combination of a sterically encumbered (PNNP)Ir complex and a base catalyst effectively solves the issues of catalyst deactivation and low turnover numbers (TONs) in the hydrogenation of CO2 to MeOH. By utilizing this strategy, the system achieves the highest TON for MeOH, surpassing most homogeneous systems without relying on amine or metal-organic framework (MOF) additives. The use of a catalytic amount of an alkali base additive plays a crucial role in sustaining the catalyst turnover and enhancing the selectivity of MeOH over in situ formed CO.
INORGANIC CHEMISTRY
(2023)
Article
Green & Sustainable Science & Technology
Xia Jiang, Feng Long, Xincheng Cao, Jiaping Zhao, Peng Liu, Junming Xu
Summary: This study demonstrated an efficient and environmentally friendly desulfurization process for converting waste cooking oil into low-sulfur biofuel. The resulting biofuel met the specifications of ASTM and EN, with low sulfur content and low cold filter plugging point. Overall, this novel method provides a valuable approach for converting low-quality waste cooking oil into high-quality biofuel.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Green & Sustainable Science & Technology
R. Kumar, V. Strezov
Summary: Methods for downstream bio-oil upgrading include hydrotreatment, solvent addition, emulsification, microfiltration, and electrocatalytic hydrogenation, which can significantly improve bio-oil properties. Using non-polar solvents or preparing emulsions can increase bio-oil calorific values and decrease viscosity.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Energy & Fuels
Sureekan Kingputtapong, Narong Chanlek, Yingyot Poo-arporn, Napida Hinchiranan
Summary: This research aims to improve the quality of waste tire pyrolysis oil (WTPO) by hydrogenation to remove toxic polycyclic aromatic hydrocarbons (PAHs). The study consists of two steps, screening suitable catalysts through the hydrogenation of naphthalene and applying the chosen catalysts for the hydrogenation of WTPO. The selection of catalysts and the chemical structure of PAHs have an impact on hydrogenation efficiency and desulfurization ability.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Environmental
Jiaxiang Zhang, Tianzuo Wang, Chengxiang Shi, Lun Pan, Xiangwen Zhang, Chong Peng, Ji-Jun Zou
Summary: An ammonium citrate assisted impregnation method was developed to fabricate loaded Ni catalyst for hydrogenation. The catalyst exhibits superior activity and high stability, making it suitable for hydrogenation of olefins and aromatics under low temperature conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Food Science & Technology
Wijittra Wongjaikham, Grittima Kongprawes, Doonyapong Wongsawaeng, Kanokwan Ngaosuwan, Worapon Kiatkittipong, Peter Hosemann, Suttichai Assabumrungrat
Summary: In this study, a microwave plasma with a negative high voltage was successfully used for the partial hydrogenation of palm olein to produce low trans-fat margarine. By adjusting various parameters such as H-2 flow rate, microwave power, reaction temperature, negative high voltage, and reaction duration, the researchers achieved optimal hydrogenation conditions. This catalyst-free method shows potential as a green alternative to conventional catalytic hydrogenation for the production of low trans-fat margarine.
INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Shohei Tada, Hiroka Kinoshita, Nagomu Ochiai, Anand Chokkalingam, Peidong Hu, Noriko Yamauchi, Yoshio Kobayashi, Kenta Iyoki
Summary: The development of methodologies for CO2 utilization is in high demand globally. Tandem catalysts of ZnZrOx and solid acid catalysts were proposed for one-pass synthesis of lower olefins. The pore sizes and channel dimensionality of zeolites influenced the selectivity of products, with zeolites with small pores showing potential for producing light olefins.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Hussah Alawisi, Hadi D. Arman, Zachary J. Tonzetich
Summary: This study investigates the activity of cobalt complexes in catalyzing the hydrogenation of alkenes and semi-hydrogenation of alkynes, highlighting the importance of the shuttling between Co(I) and Co(III) states in the reaction mechanism. The generation of small quantities of Co(II) during catalytic turnover is found to be responsible for the observed isomerization in alkyne semi-hydrogenation.
Review
Chemistry, Multidisciplinary
Iman Nezam, Wei Zhou, Gabriel S. Gusmao, Matthew J. Realff, Ye Wang, Andrew J. Medford, Christopher W. Jones
Summary: This review discusses recent advances in the direct hydrogenation of CO2 to aromatics via heterogeneous catalysis, focusing on the design and deployment of tandem catalysts, key parameters affecting catalytic performance, as well as thermodynamic analyses, mechanistic studies, and DFT computations for understanding CO2 activation, reaction intermediates, and product formation. Challenges and prospects for these tandem reactions are also addressed to provide suggestions for future research.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Physical
Jia-qi Bai, Masazumi Tamura, Akira Nakayama, Yoshinao Nakagawa, Keiichi Tomishige
Summary: Metal-alloyed atomic catalysts, such as the Ni-Ir/SiO2 catalyst, have shown high activity in hydrogenation reactions due to the presence of specific active sites like the Ni-Ir single atom in the alloy. Bimetallic catalysts composed of non-noble and noble metals exhibit significantly enhanced catalytic activity compared to monometallic counterparts, with specific combinations like Ni-IrSiO2 and Co-Ir/SiO2 being particularly effective. The hydrogenation mechanism over the Ni-Ir single atom involves electron transfers between Ni and Ir atoms, resulting in a low activation energy and improved catalytic performance.
Article
Chemistry, Physical
Kenton E. Hicks, Andrew T. Y. Wolek, Omar K. Farha, Justin M. Notestein
Summary: This study investigates the influence of thermal pretreatments and MOF topology on the activity of Zr6O8 clusters for H-2 activation and 1-butene hydrogenation and isomerization. The results show that both thermal pretreatment and MOF topology affect the acidity of protons generated from H-2 activation and their resulting activity for olefin conversion. Additionally, the geometry of open coordination sites on individual Zr6O8 nodes influences butene hydrogenation.
Article
Chemistry, Physical
Kenton E. Hicks, Andrew T. Y. Wolek, Omar K. Farha, Justin M. Notestein
Summary: This study investigates the influence of thermal pretreatments and MOF topology on the activity of Zr6O8 cluster in Zr-MOFs. The results show that both factors affect the acidity of protons generated from H2 activation and their resulting activity for olefin conversion. The geometry of open coordination sites on individual Zr6O8 nodes also influences butene hydrogenation. These findings underscore the importance of pretreatment and MOF topology in defining MOF catalytic activity.
Article
Chemistry, Multidisciplinary
Kanju Mitamura, Takafumi Yatabe, Kidai Yamamoto, Tomohiro Yabe, Kosuke Suzuki, Kazuya Yamaguchi
Summary: This study successfully achieved an efficient base-free formal C-S bond metathesis of various thiols using a rationally designed heterogeneously catalyzed system with Ni-Pd alloy nanoparticles supported on hydroxyapatite (Ni-Pd/HAP) under an H-2 atmosphere, by suppressing the deactivation of the Ni catalyst.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Manhao Zeng, Yu-Hsuan Lee, Garrett Strong, Anne M. LaPointe, Andrew L. Kocen, Zhiqiang Qu, Geoffrey W. Coates, Susannah L. Scott, Mahdi M. Abu-Omar
Summary: This study demonstrates a new approach for recycling polyethylene plastic, upgrading it to higher value-added divinyl oligomers with high yields through a sequence of reactions. The three-step process is economically viable on an industrial scale, converting discarded polyethylene into value-added chemicals for various applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Xianyuan Wu, Mario De Bruyn, Julia Michaela Hulan, Henrique Brasil, Zhuohua Sun, Katalin Barta
Summary: In this study, a catalytic methodology is developed for the transformation of beech lignin-derived dimers and oligomers into industrially relevant 1,4-cyclohexanediol and 1,4-cyclohexanediamine. The proposed two-step catalytic sequence, using commercially available RANEY (R) Ni catalyst, enables efficient and selective conversion. This process has great potential for future industrial synthesis of 1,4-cyclohexanediamine from renewable resources.
