Imperial College London

Prof Klaus Hellgardt

Faculty of EngineeringDepartment of Chemical Engineering

Professor of Chemical Engineering
 
 
 
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Contact

 

k.hellgardt

 
 
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Location

 

208Bone BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

165 results found

Kojo G, Wei X, Matsuzaki Y, Matsuo H, Hellgardt K, Otomo Jet al., 2019, Fabrication and electrochemical performance of anode-supported solid oxide fuel cells based on proton-conducting lanthanum tungstate thin electrolyte, Solid State Ionics, Vol: 337, Pages: 132-139, ISSN: 0167-2738

© 2019 Elsevier B.V. The performance of an anode-supported proton-conducting solid oxide fuel cell (p-SOFC)was investigated by controlling transport properties of thin electrolyte membranes. Hole conductivity in electrolyte, which induces to degrade the cell performance, was sufficiently suppressed by using lanthanum tungstate La 28-x W 4+x O 54+3x/2 v 2-3x/2 (LWO)with high proton conductivity and low hole conductivity. SrFe 0.95 Nb 0.05 O 3-δ (SFN)and Ni-Ce 0.9 Gd 0.1 O 2-δ (Ni-GDC10)cermet were used as the cathode and anode, respectively. GDC10 was also used as an interlayer to prevent chemical reactions between the electrolyte and electrodes. SEM images and electrochemical impedance spectroscopy showed that the boundaries between the electrolyte and electrodes were stable because GDC10 blocked chemical reactions and cation diffusion at the electrolyte-electrode interfaces. Fuel cell tests were also performed with SFN/GDC10/LWO/GDC10/Ni-GDC anode-supported single cells. The thickness of the LWO thin electrolyte was approximately 3 μm. The OCV values were measured to be 0.88 V and 0.94 V at 800 °C and 600 °C, respectively. Moreover, the evaluation of the leakage current indicated that thin LWO could achieve the low leakage current due to transport properties such as high proton conductivity and low hole and electron conductivities.

JOURNAL ARTICLE

Antunes MM, Lima S, Fernandes A, Ribeiro MF, Chadwick D, Hellgardt K, Pillinger M, Valente AAet al., 2019, One-pot hydrogen production and cascade reaction of furfural to bioproducts over bimetallic Pd-Ni TUD-1 type mesoporous catalysts (vol 237, pg 521, 2018), APPLIED CATALYSIS B-ENVIRONMENTAL, Vol: 243, Pages: 801-801, ISSN: 0926-3373

JOURNAL ARTICLE

del Rio-Chanona EA, Wagner JL, Ali H, Fiorelli F, Zhang D, Hellgardt Ket al., 2019, Deep learning-based surrogate modeling and optimization for microalgal biofuel production and photobioreactor design, AICHE JOURNAL, Vol: 65, Pages: 915-923, ISSN: 0001-1541

JOURNAL ARTICLE

Holmes-Gentle I, Bedoya-Lora F, Alhersh F, Hellgardt Ket al., 2019, Optical Losses at Gas Evolving Photoelectrodes: Implications for Photoelectrochemical Water Splitting, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 123, Pages: 17-28, ISSN: 1932-7447

JOURNAL ARTICLE

Parkinson B, Balcombe P, Speirs JF, Hawkes AD, Hellgardt Ket al., 2019, Levelized cost of CO2 mitigation from hydrogen production routes, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 12, Pages: 19-40, ISSN: 1754-5692

JOURNAL ARTICLE

Wagner JL, Lee-Lane D, Monaghan M, Sharifzadeh M, Hellgardt Ket al., 2019, Recovery of excreted n-butanol from genetically engineered cyanobacteria cultures: Process modelling to quantify energy and economic costs of different separation technologies, ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, Vol: 37, Pages: 92-102, ISSN: 2211-9264

JOURNAL ARTICLE

Antunes MM, Lima S, Fernandes A, Ribeiro MF, Chadwick D, Hellgardt K, Pillinger M, Valente AAet al., 2018, One-pot hydrogen production and cascade reaction of furfural to bioproducts over bimetallic Pd-Ni TUD-1 type mesoporous catalysts, APPLIED CATALYSIS B-ENVIRONMENTAL, Vol: 237, Pages: 521-537, ISSN: 0926-3373

JOURNAL ARTICLE

Roberts FJ, Richard C, Zemichael FW, Hii KKM, Hellgardt K, Brennan C, Sale DAet al., 2018, Base-free, tunable, Au-catalyzed oxidative esterification of alcohols in continuous flow, REACTION CHEMISTRY & ENGINEERING, Vol: 3, Pages: 942-948, ISSN: 2058-9883

JOURNAL ARTICLE

Holmes-Gentle I, Hellgardt K, 2018, A versatile open-source analysis of the limiting efficiency of photo electrochemical water-splitting, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322

JOURNAL ARTICLE

Harun I, Del Rio-Chanona EA, Wagner JL, Lauersen KJ, Zhang D, Hellgardt Ket al., 2018, Photocatalytic Production of Bisabolene from Green Microalgae Mutant: Process Analysis and Kinetic Modeling, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 57, Pages: 10336-10344, ISSN: 0888-5885

JOURNAL ARTICLE

Barreiro EM, Hao Z, Adrio LA, van Ommen JR, Hellgardt K, Hii KKMet al., 2018, Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow, CATALYSIS TODAY, Vol: 308, Pages: 64-70, ISSN: 0920-5861

JOURNAL ARTICLE

Daggash HA, Patzschke CF, Heuberger CF, Zhu L, Hellgardt K, Fennell PS, Bhave AN, Bardow A, Mac Dowell Net al., 2018, Closing the carbon cycle to maximise climate change mitigation: power-to-methanol vs. power-to-direct air capture, SUSTAINABLE ENERGY & FUELS, Vol: 2, Pages: 1153-1169, ISSN: 2398-4902

JOURNAL ARTICLE

Holmes-Gentle I, Agarwal H, Alhersh F, Hellgardt Ket al., 2018, Assessing the scalability of low conductivity substrates for photo-electrodes via modelling of resistive losses, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 20, Pages: 12422-12429, ISSN: 1463-9076

JOURNAL ARTICLE

Leung AYK, Hellgardt K, Hii KKM, 2018, Catalysis in Flow: Nickel-Catalyzed Synthesis of Primary Amines from Alcohols and NH3, ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol: 6, Pages: 5479-5484, ISSN: 2168-0485

JOURNAL ARTICLE

Bystron T, Horbenko A, Syslova K, Hii KKM, Hellgardt K, Kelsall Get al., 2018, 2-Iodoxybenzoic Acid Synthesis by Oxidation of 2-Iodobenzoic Acid at a Boron-Doped Diamond Anode, CHEMELECTROCHEM, Vol: 5, Pages: 1002-1005, ISSN: 2196-0216

JOURNAL ARTICLE

Iruretagoyena D, Hellgardt K, Chadwick D, 2018, Towards autothermal hydrogen production by sorption-enhanced water gas shift and methanol reforming: A thermodynamic analysis, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 43, Pages: 4211-4222, ISSN: 0360-3199

JOURNAL ARTICLE

Cardoso A, Ramirez Reina T, Suelves I, Pinilla JL, Millan M, Hellgardt Ket al., 2018, Effect of carbon-based materials and CeO <inf>2</inf> on Ni catalysts for Kraft lignin liquefaction in supercritical water, Green Chemistry, Vol: 20, Pages: 4308-4318, ISSN: 1463-9262

© The Royal Society of Chemistry 2018. Kraft lignin (KL) is a by-product from cellulose production typically treated as a waste or used as a low-value fuel in heat and power generation in the pulp and paper industry. This study explores KL upgrading to monoaromatic compounds using supercritical water (SCW) as reaction medium. The effect of Ni-CeO 2 catalysts supported on carbon nanofibers (CNF) and activated carbon (AC) on the product distribution was investigated. These catalysts were prepared by a wet-impregnation method with acetone, and reduced Ni was observed without the use of H 2 . CNF presented a high degree of stability in SCW. Ni in its reduced state was still present in all spent catalysts, mainly when CNF were the support. While catalysts supported in AC led to high yields of char and gas, a 56 wt% yield of a light liquid fraction, recovered as dichloromethane (DCM)-soluble product and consisting mainly of (methoxy)phenols (>80 mol%), was obtained in a batch reactor at 400 °C, 230 bar, with Ni-CeO 2 /CNF as a catalyst. A short reaction time was key to avoid the formation of gas and char. This study demonstrates that high yields of DCM-soluble products from KL and low char formation can be obtained by using only SCW and catalysts, an alternative to widely reported approaches like the addition of organic co-solvents (e.g., phenol) and/or H 2 .

JOURNAL ARTICLE

Arcelus-Arrillaga P, Hellgardt K, Millan M, 2017, Effect of process conditions on the hydrothermal partial oxidation of phenanthrene as a heavy oil model structure, FUEL, Vol: 209, Pages: 434-441, ISSN: 0016-2361

JOURNAL ARTICLE

Loponov KN, Deadman BJ, Zhu J, Rielly C, Holdich RG, Hii KKM, Hellgardt Ket al., 2017, Controlled multiphase oxidations for continuous manufacturing of fine chemicals, CHEMICAL ENGINEERING JOURNAL, Vol: 329, Pages: 220-230, ISSN: 1385-8947

JOURNAL ARTICLE

Sawa M, Fantuzzi A, Bombelli P, Howe CJ, Hellgardt K, Nixon PJet al., 2017, Electricity generation from digitally printed cyanobacteria, NATURE COMMUNICATIONS, Vol: 8, ISSN: 2041-1723

JOURNAL ARTICLE

Deadman B, Gian S, Jin X, Adrio L, Zhu J, Hellgardt K, Hii Met al., 2017, On-demand electrochemical generation of oxidants and their applications in organic synthesis, 254th National Meeting and Exposition of the American-Chemical-Society (ACS) on Chemistry's Impact on the Global Economy, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Deadman BJ, Hellgardt K, Hii KKM, 2017, A colorimetric method for rapid and selective quantification of peroxodisulfate, peroxomonosulfate and hydrogen peroxide, REACTION CHEMISTRY & ENGINEERING, Vol: 2, Pages: 462-466, ISSN: 2058-9883

JOURNAL ARTICLE

Antunes MM, Lima S, Fernandes A, Magalhaes AL, Neves P, Silva CM, Ribeiro MF, Chadwick D, Hellgardt K, Pillinger M, Valente AAet al., 2017, MFI Acid Catalysts with Different Crystal Sizes and Porosity for the Conversion of Furanic Compounds in Alcohol Media, CHEMCATCHEM, Vol: 9, Pages: 2747-2759, ISSN: 1867-3880

JOURNAL ARTICLE

Holmes-Gentle I, Hoffmann F, Mesa CA, Hellgardt Ket al., 2017, Membrane-less photoelectrochemical cells: product separation by hydrodynamic control, SUSTAINABLE ENERGY & FUELS, Vol: 1, Pages: 1184-1198, ISSN: 2398-4902

JOURNAL ARTICLE

Arcelus-Arrillaga P, Pinilla JL, Hellgardt K, Millan Met al., 2017, Application of Water in Hydrothermal Conditions for Upgrading Heavy Oils: A Review, ENERGY & FUELS, Vol: 31, Pages: 4571-4587, ISSN: 0887-0624

JOURNAL ARTICLE

Phanopoulos A, Leung AHM, Yow S, Palomas D, White AJP, Hellgardt K, Horton A, Crimmin MRet al., 2017, Binuclear beta-diketiminate complexes of copper(I), DALTON TRANSACTIONS, Vol: 46, Pages: 2081-2090, ISSN: 1477-9226

JOURNAL ARTICLE

Patel B, Arcelus-Arrillaga P, Izadpanah A, Hellgardt Ket al., 2017, Catalytic Hydrotreatment of algal biocrude from fast Hydrothermal Liquefaction, RENEWABLE ENERGY, Vol: 101, Pages: 1094-1101, ISSN: 0960-1481

JOURNAL ARTICLE

Brazier JB, Hellgardt K, Hii KKM, 2017, Catalysis in flow: O-2 effect on the catalytic activity of Ru(OH)(x)/gamma-Al2O3 during the aerobic oxidation of an alcohol, REACTION CHEMISTRY & ENGINEERING, Vol: 2, Pages: 60-67, ISSN: 2058-9883

JOURNAL ARTICLE

Freeman J, Hellgardt K, Markides CN, 2017, Working fluid selection and electrical performance optimisation of a domestic solar-ORC combined heat and power system for year-round operation in the UK, APPLIED ENERGY, Vol: 186, Pages: 291-303, ISSN: 0306-2619

JOURNAL ARTICLE

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