Blar i Institutt for kjemisk prosessteknologi på forfatter "Chen, De"
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Nitrogen-doped Carbon Nanofibers for the Oxygen Reduction Reaction
Buan, Marthe Emelie Melandsø (Doctoral theses at NTNU;2017:78, Doctoral thesis, 2017)Summary of thesis: One of the major obstacles for the commercialization of fuel cells is the necessity for high cost noble metals to facilitate the electrode reactions. Especially the oxygen reduction reaction (ORR) is ... -
Nitrogen-doped Carbon Nanofibers for the Oxygen Reduction Reaction: Importance of the Iron Growth Catalyst Phase
Buan, Marthe Emelie Melandsø; Muthuswamy, Navaneethan; Walmsley, John; Chen, De; Rønning, Magnus (Journal article; Peer reviewed, 2017)A systematic evaluation of the oxygen reduction reaction (ORR) on nitrogen-doped carbon nanofibers (N-CNFs) has been performed by tuning the properties of the N-CNFs by using chemical vapor deposition. Analysis of the ... -
Nitrogen-doped carbon nanofibers on expanded graphite as oxygen reduction electrocatalysts
Buan, Marthe Emelie Melandsø; Muthuswamy, Navaneethan; Walmsley, John; Chen, De; Rønning, Magnus (Journal article; Peer reviewed, 2016)A single-step chemical vapor deposition method using simple gaseous precursors was employed to grow nitrogen-doped carbon nanofibers from Fe and Ni particles on the surface of expanded graphite (N-CNF/EG). Due to the high ... -
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 ... -
On the nature of Pt-carbon interactions for enhanced hydrogen generation
Chen, Wenyao; Chen, S. M.; Qian, G.; Song, L.; Chen, De; Zhou, Xinggui; Duan, Xuezhi (Peer reviewed; Journal article, 2020)Understanding the metal-support interactions in heterogeneous catalysis is critical yet complicated to tailor-design the catalysts with desirable properties. Exemplified with Pt-catalyzed ammonia borane (AB) hydrolysis, a ... -
One-pot catalytic vinyl chloride (VCM) production
Tran, Tho Ba (Master thesis, 2019)Målet med denne tesen var å syntetisere metallfrie katalysatorer for ett-steg syntese av vinylkloridmonomer (VCM), samt videre studie av katalysatorene ved bruk av ulike karakteriseringsteknikker som N2-fysisorbsjon, Raman ... -
One-pot conversion of biomass to chemicals
Baumgarten, Björn Frederik (Master thesis, 2017)One-pot conversion of biomass to diols can be a simple and fast alternative to other methods of biomass conversion. The catalyst for this conversion is required to be bifunctional, catalysing both hydrogenation and retro-aldol ... -
One-pot Conversion of Biomass to Chemicals on Ni-Cu/ZnO Based Catalysts
Morken, Siri Foss (Master thesis, 2015)Optimization of the one-pot hydrothermal reaction of cellulose to polyols have been investigated. Ni-Cu-ZnO catalysts supported by carbon nanotubes (CNT) with varying nickel (Ni) and copper (Cu) mole ratio was synthesized ... -
One-Pot Conversion of Cellulose to Ethylene Glycol and Propylene Glycol over Nickel Zinc Oxide Catalysts with CNT Support
Liland, Ingvild Skeie (Master thesis, 2013)Ni-Zn oxide catalysts with CNT support were prepared by the pechini method, and evaluated for the conversion of cellulose to polyols. The catalysts were characterized by XRD, SEM/TEM, N2 adsorption, temperature programmed ... -
One-pot Conversion of Cellulose to Ethylene Glycol using CNT Supported Tungsten Catalysts
Kaalstad, Petter (Master thesis, 2017)The one-pot catalytic conversion of cellulose to ethylene glycol (EG) is a promising approach for biomass utilization. The catalysts developed for this process have to be bifunctional, catalysing both retro-aldol condensation ... -
Optimising surface d charge of AuPd nanoalloy catalysts for enhanced catalytic activity
Zhu, Xiaojuan; Qishui, Guo; Sun, Yafei; Chen, Shangjun; Wang, Jian-Qiang; Wu, Mengmeng; Fu, Wenzhao; Tang, Yanqiang; Duan, Xuezhi; Chen, De; Wan, Ying (Journal article; Peer reviewed, 2019)Understanding the catalytic mechanism of bimetallic nanocatalysts remains challenging. Here, we adopt an adsorbate mediated thermal reduction approach to yield monodispersed AuPd catalysts with continuous change of the ... -
Organic Electrolytes for Thermoelectric Devices and CNT Electrode functionalization by Nitrogen-doping
Hjorth, Ida (Master thesis, 2012)In this thesis a thermoelectric cell is developed. Aligned Carbon Nanotubes and aligned Nitrogen-doped Carbon Nanotubes are used as electrode materials. Ferri/Ferrocyanide and Tetrabutylammonium Nitrate (TBAN) electrolytes have ... -
Origin of Chemisorption Energy Scaling Relations over Perovskite Surfaces
Li, Yang; Cheng, W; Sui, Zhi jun; Zhou, Xinggui; Chen, De; Yuan, Wei-kang; Zhu, Yi-an (Journal article; Peer reviewed, 2019)Rationally tailored perovskites ABO3 are promising substitutes for expensive noble-metal catalysts in heterogeneous catalysis. In this contribution, the BEEF-vdW + U method has been used to examine the adsorption of H, C, ... -
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 ... -
Polymer decoration of carbon support to boost Pt-catalyzed hydrogen generation activity and durability
Chen, Wenyao; Fu, W.Z.; Chen, Bingxu; Peng, C.; Qian, G.; Chen, De; Duan, Xuezhi; Zhou, Xinggui (Peer reviewed; Journal article, 2020)Decorating the catalyst support with organic moieties to integrate multiple functionalities into metal particles offers a unique platform to promote the catalytic performance. Here, we report a mechanism-driven strategy ... -
Porous Carbon Prepared by Chemical Activation for High-Energy Supercapacitors in Ionic Liquid Electrolyte
Wang, Xuehang (Doctoral theses at NTNU;2016:264, Doctoral thesis, 2016)Supercapacitor (SC), a high-power, safe and long-lifetime energy storage device, has been considered as a potential candidate to replace the use of rechargeable batteries for mobile high-power application. Due to the ... -
Potassium adsorption behavior on hcp cobalt as model systems for the Fischer–Tropsch synthesis: a density functional theory study
Chen, Qingjun; Svenum, Ingeborg-Helene; Qi, Yanying; Gavrilovic, Ljubisa; Chen, De; Holmen, Anders; Blekkan, Edd Anders (Journal article; Peer reviewed, 2017)Potassium (K), an important impurity in syngas from biomass, can have a large influence on the activity and selectivity of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts in Biomass to Liquids (BTL) processes. In ... -
Production of 2nd generation dolomite-based solid sorbents for high-temperature CO2 capture
Woxholt, Eirik (Master thesis, 2022)Verden står overfor en stadig økende miljøtrussel forårsaket av økende utslipp av menneskeskapt karbondioksid, det er derfor avgjørende å finne strategier for å redusere disse utslippene. Calcium-looping (Ca-L) har dukket ... -
Production of fuel-cell grade H2 by sorption enhanced steam reforming of acetic acid as a model compound of biomass-derived bio-oil
Gil Matellanes, Maria Victoria; Fermoso, Javier; Pevida, Covadonga; Chen, De; Rubiera, Fernando (Journal article; Peer reviewed, 2016)Fuel-cell grade H2 has been produced by the sorption enhanced steam reforming (SESR) of acetic acid, a model compound of the bio-oil obtained from the fast pyrolysis of biomass. A Pd/Ni–Co catalyst derived from a ...