Dr. Narendra Kumar
Faculty of Science and Engineering, Industrial Chemistry and Reaction Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Turku/Åbo, Finland
'%3e%3cpath%20d='M22.1642%2019.0924C21.7317%2018.068%2021.1041%2017.1375%2020.3163%2016.3527C19.5309%2015.5656%2018.6006%2014.9381%2017.5766%2014.5048C17.5674%2014.5002%2017.5582%2014.4979%2017.5491%2014.4933C18.9774%2013.4616%2019.9059%2011.7811%2019.9059%209.88504C19.9059%206.74408%2017.3611%204.19922%2014.2201%204.19922C11.0792%204.19922%208.53429%206.74408%208.53429%209.88504C8.53429%2011.7811%209.46282%2013.4616%2010.8912%2014.4956C10.882%2014.5002%2010.8728%2014.5025%2010.8636%2014.5071C9.83652%2014.9404%208.91487%2015.5617%208.1239%2016.355C7.33685%2017.1404%206.70933%2018.0707%206.276%2019.0947C5.85031%2020.0972%205.62072%2021.172%205.59967%2022.2609C5.59905%2022.2853%205.60335%2022.3097%205.61229%2022.3325C5.62123%2022.3553%205.63465%2022.376%205.65174%2022.3935C5.66883%2022.4111%205.68926%2022.425%205.71182%2022.4345C5.73437%2022.444%205.7586%2022.4489%205.78308%2022.4489H7.15868C7.25956%2022.4489%207.3398%2022.3686%207.3421%2022.2701C7.38795%2020.5001%208.09868%2018.8425%209.35506%2017.5861C10.655%2016.2862%2012.3814%2015.5709%2014.2201%2015.5709C16.0588%2015.5709%2017.7852%2016.2862%2019.0852%2017.5861C20.3415%2018.8425%2021.0523%2020.5001%2021.0981%2022.2701C21.1004%2022.3709%2021.1807%2022.4489%2021.2815%2022.4489H22.6571C22.6816%2022.4489%2022.7058%2022.444%2022.7284%2022.4345C22.751%2022.425%2022.7714%2022.4111%2022.7885%2022.3935C22.8056%2022.376%2022.819%2022.3553%2022.8279%2022.3325C22.8369%2022.3097%2022.8412%2022.2853%2022.8406%2022.2609C22.8176%2021.165%2022.5907%2020.0989%2022.1642%2019.0924ZM14.2201%2013.8284C13.1678%2013.8284%2012.1773%2013.418%2011.4322%2012.6729C10.6871%2011.9278%2010.2767%2010.9374%2010.2767%209.88504C10.2767%208.83271%2010.6871%207.84227%2011.4322%207.09715C12.1773%206.35204%2013.1678%205.94165%2014.2201%205.94165C15.2724%205.94165%2016.2629%206.35204%2017.008%207.09715C17.7531%207.84227%2018.1635%208.83271%2018.1635%209.88504C18.1635%2010.9374%2017.7531%2011.9278%2017.008%2012.6729C16.2629%2013.418%2015.2724%2013.8284%2014.2201%2013.8284Z'%20fill='%238590A2'/%3e%3c/g%3e%3c/svg%3e)
Co-authors
Following
Followers
Research Focus & Metrics
Explore full metrics on Scilit
Academic Career Length
25Years (2002-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 October 2015 in Applied Catalysis B: Environment and Energy
Journal Article
LKLakhya Jyoti Konwar
Lakhya Jyoti Konwar
PMPäivi Mäki-Arvela
Päivi Mäki-ArvelaESEero Salminen
Eero Salminen
Narendra KumarATAshim Jyoti Thakur
Ashim Jyoti ThakurDDDhanapati Deka
Dhanapati Deka +1
Journal Article
XLXuan Liu
Xuan LiuPMPäivi Mäki-Arvela
Päivi Mäki-ArvelaAAAtte Aho
Atte AhoZVZuzana Vajglova
Zuzana Vajglova
Volodymyr M Gun'ko
Dmitry Murzin +4
Measurements of the zeta potential of solid heterogeneous supports are important for preparation of metal supported catalysts and for shaping zeolites into extrudates. In the current work, different types of heterogeneous support materials such as SiO2, Al2O3, and a range of beta zeolites of different silica- to-alumina ratio were analysed. It was observed that parameters such as temperature, pH and acidity significantly affect the zeta potential. In several instances, depending on the materials’ acidity and microstructure, maxima in zeta potential were observed. The solid materials were thoroughly characterized using XRD, SEM, EDX, TEM, nitrogen physisorption, Al-NMR and FTIR with pyridine before zeta potential measurements.
9 August 2011 in Topics in Catalysis
Journal Article
AAA. Aho
A. AhoATA. Tokarev
A. TokarevPBP. Backman
P. BackmanNarendra KumarKEK. Eränen
K. EränenDmitry Murzin +3
Journal Article
MSMartina Stekrova
Martina StekrovaNarendra KumarPMPäivi Mäki-Arvela
Päivi Mäki-ArvelaOAOleg V. Ardashov
Oleg V. Ardashov
Konstantin VolchoDmitry Murzin +1
Ce-modified mesoporous silica materials MCM-41 and SBA-15, namely 32 wt % Ce–Si–MCM-41, 16 wt % Ce–H–MCM-41 and 20 wt % Ce–Si–SBA-15, were prepared, characterized and studied in the selective preparation of trans-carveol by α-pinene oxide isomerization. The characterizations of these catalysts were performed using scanning electron microscopy, X-ray photoelectron spectroscopy, nitrogen adsorption and FTIR pyridine adsorption. Selective preparation of trans-carveol was carried out in the liquid phase in a batch reactor. The activity and the selectivity of catalyst were observed to be influenced by their acidity, basicity and morphology of the mesoporous materials. The formation of trans-carveol is moreover strongly influenced by the basicity of the used solvent and in order to achieve high yields of this desired alcohol it is necessary to use polar basic solvent.
Journal Article
XLXiaojia Lu
Xiaojia LuYWYanjun WANG
Yanjun WANG
Lionel EstelNarendra Kumar
Henrik Grenman
Sebastien LeveneurHeterogeneous catalysts are widely used in the chemical industry. Compared with homogeneous catalysts, they can be easily separated from the reaction mixture. To design and optimize an efficient and safe chemical process one needs to calculate the energy balance, implying the need for knowledge of the catalyst’s specific heat capacity. Such values are typically not reported in the literature, especially not the temperature dependence. To fill this gap in knowledge, the specific heat capacities of commonly utilized heterogeneous catalytic supports were measured at different temperatures in a Tian–Calvet calorimeter. The following materials were tested: activated carbon, aluminum oxide, amberlite IR120 (H-form), H-Beta-25, H-Beta-38, H-Y-60, H-ZSM-5-23, H-ZSM-5-280, silicon dioxide, titanium dioxide, and zeolite 13X. Polynomial expressions were successfully fitted to the experimental data.
Journal Article
Fine chemicals are produced in small annual volume batch processes (often USD 10/kg). As a result of their usage in the production of speciality chemicals, in areas including agrochemicals, fragrances, and pharmaceuticals, the need for them will remain high for the foreseeable future. This review article assesses current methods used to produce fine chemicals with heterogeneous catalysts, including both well-established and newer experimental methods. A wide range of methods, utilising microporous and mesoporous catalysts, has been explored, including their preparation and modification before use in industry. Their potential drawbacks and benefits have been analysed, with their feasibility compared to newer, recently emerging catalysts. The field of heterogeneous catalysis for fine chemical production is a dynamic and ever-changing area of research. This deeper insight into catalytic behaviour and material properties will produce more efficient, selective, and sustainable processes in the fine chemical industry. The findings from this article will provide an excellent foundation for further exploration and a critical review in the field of fine chemical production using micro- and mesoporous heterogeneous catalysts.
About Me
Prof. Dr. Narendra Kumar has obtained his Dr. Tech. (Chemical Engineering) from Åbo Akademi University, Turku/Åbo, Finland in the year 1996. He has been working at Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University since 1990. His duties are research, education, supervision of PhD, MSc. and B. Sc. students. He has published 498 peer-reviewed research papers in reputed, high impact factor international scientific journals in the field of catalysis, catalytic materials, catalyst synthesis and characterizations, microporous and mesoporous materials, chemical engineering, petro-chemicals, oil refining, biofuels, environmental catalysis, fine chemicals, pharmaceuticals and speciality chemical synthesis. His H-index is 43. He has co-supervised more than 75 Doctoral, Licentiate and M.Sc Thesis.
Dr. Narendra Kumar has been awarded Åbo Akademi University Bronz and Silver medal for continuous services at the university for more than 30 years. He has evaluated doctoral theses and acted as opponent and examiner for universities in Finland, Sweden and Spain. He is a member of scientific committee and acts as a reviewer for Federation of European Zeolite Association, International Zeolite Association, International Conference on Engineering for Waste and Biomass Valorization, International Conference on Catalysis and Nordic Symposium on Catalysis.
Dr. Narendra Kumar is an expert for evaluation of European Union Projects, Horizon Europe (2021-2027).