Blar i NTNU Open på forfatter "Ma, Hongfei"
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Atomic Cu-N-P-C Active Complex with Integrated Oxidation and Chlorination for Improved Ethylene Oxychlorination
Ma, Hongfei; Zheng, Xiuhui; Zhang, Hao; Ma, Guoyan; Zhang, Wei; Jiang, Zheng; Chen, de (Journal article; Peer reviewed, 2023)Fine constructing the chemical environment of the central metal is vital in developing efficient single-atom catalysts (SACs). Herein, the atomically dispersed Cu on the N-doped carbon is modulated by introducing CuP ... -
Cluster-size-dependent interaction between ethylene and CuCl2 clusters supported via γ-alumina
Qi, Yanying; Fenes, Endre; Ma, Hongfei; Wang, Yalan; Rout, Kumar Ranjan; Fuglerud, Terje; Marco, Piccinini; Chen, De (Peer reviewed; Journal article, 2020)Alumina-supported copper chloride serves as an industrial catalyst for ethylene oxychlorination, resulting from its high activity and selectivity. A better understanding of the detailed active site structure and reaction ... -
CO Oxidation over Alumina-Supported Copper Catalysts
Ma, Guoyan; Wang, Le; Wang, Xiaorong; Li, Lu; Ma, Hongfei (Peer reviewed; Journal article, 2022)CO oxidation, one of the most important chemical reactions, has been commonly studied in both academia and the industry. It is one good probe reaction in the fields of surface science and heterogeneous catalysis, by which ... -
Critical review of catalysis for ethylene oxychlorination
Ma, Hongfei; Wang, Yalan; Qi, Yanying; Rout, Kumar Ranjan; Chen, De (Peer reviewed; Journal article, 2020)Ethylene oxychlorination is the key technology in vinyl chloride (VCM, the monomer of PVC, polyvinyl chloride) production to close the chlorine loop by consuming the HCl released from the former cracking step. Due to the ... -
Engineering a Coordinatively Unsaturated Au–O–Ti<sup>3+</sup> Structure Toward Unprecedented H<inf>2</inf> Efficiency for Low-Temperature Propene Epoxidation with H<inf>2</inf> and O<inf>2</inf>
Song, Zhaoning; Yan, Hao; Yuan, Juncong; Ma, Hongfei; Cao, Jianlin; Wang, Yongxiang; Wang, Qiang; Peng, Chong; Deng, Feng; Feng, Xiang; Chen, de; Yang, Chaohe; Hu, Yongkang (Journal article; Peer reviewed, 2023) -
Kinetic modeling of dynamic changing active sites in a Mars-van Krevelen type reaction: Ethylene oxychlorination on K-doped CuCl2/Al2O3
Ma, Hongfei; Sollund, Erling S.; Zhang, Wei; Fenes, Endre; Qi, Yanying; Wang, Yalan; Rout, Kumar Ranjan; Fuglerud, Terje; Piccinini, Marco; Chen, De (Peer reviewed; Journal article, 2020)A kinetic model was developed by taking into account the dynamic nature of the active sites in Mars–van Krevelen type catalytic reactions to predict the evolution of the reactant and product composition in the gas phase ... -
Kinetic Studies of Ethylene Oxychlorination to Ethylene Dichloride and Vinyl Chloride
Ma, Hongfei (Doctoral theses at NTNU;2021:85, Doctoral thesis, 2021)Polyvinyl chloride (PVC) is the most versatile of all thermoplastics that can be used in a wide range of applications. It is the third-highest volume polymer, slightly behind polyethylene and polypropylene. Vinyl chloride, ... -
Nitrogen‐Doped Carbon-Assisted One‐pot Tandem Reaction for Vinyl Chloride Production via Ethylene Oxychlorination
Ma, Hongfei; Ma, Guoyan; Qi, Yanying; Wang, Yalan; Chen, Qingjun; Rout, Kumar Ranjan; Fuglerud, Terje; Chen, De (Peer reviewed; Journal article, 2020)A bifunctional catalyst comprising CuCl2/Al2O3 and nitrogen‐doped carbon was developed for an efficient one‐pot ethylene oxychlorination process to produce vinyl chloride monomer (VCM) up to 76 % yield at 250 °C and under ... -
Origin of potassium promotion effects on CuCl2/gamma-Al2O3 catalyzed ethylene oxychlorination
Qi, Yanying; Fenes, Endre; Ma, Hongfei; Wang, Yalan; Fuglerud, Terje; Marco, Piccinini; Chen, De (Peer reviewed; Journal article, 2020)Potassium promoters are widely used in industrial catalysts of ethylene oxychlorination to achieve optimum performance. However, the origin of the promoter effect is not fully understood. Herein, we investigated the potassium ... -
Origin of potassium promotion effects on CuCl2/gamma-Al2O3 catalyzed ethylene oxychlorination
Qi, Yanying; Fenes, Endre; Ma, Hongfei; Wang, Yalan; Fuglerud, Terje; Marco, Piccinini; Chen, De (Peer reviewed; Journal article, 2020)Potassium promoters are widely used in industrial catalysts of ethylene oxychlorination to achieve optimum performance. However, the origin of the promoter effect is not fully understood. Herein, we investigated the potassium ... -
Thermal and Rheological Performances Evaluation of a Modified Biopolymer for Fracturing Fluid System
Ma, Guoyan; Wang, Le; Hao, Chao; Du, Chunbao; Ma, Hongfei (Journal article; Peer reviewed, 2022)Developing an efficient fracturing fluid system is an enduring hot topic in the petrochemical industries, especially regarding the exploitation of limited oil. Biopolymers, especially polysaccharides (e.g., konjac gum, ... -
Understanding of K and Mg co-promoter effect in ethylene oxychlorination by operando UV–vis-NIR spectroscopy
Ma, Hongfei; Fenes, Endre; Qi, Yanying; Wang, Yalan; Rout, Kumar Ranjan; Fuglerud, Terje; Chen, De (Peer reviewed; Journal article, 2020)The comprehensive kinetic study for CuCl2/γ-Al2O3-based catalysts was performed to elucidate the co-promoter effect in the ethylene oxychlorination, one of the most significant industrial processes to produce vinyl chloride ...