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Copper–manganese mixed oxides: CO2- selectivity, stable, and cyclic performance for chemical looping combustion of methane

IR@CSIR-NEERI

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Title Copper–manganese mixed oxides: CO2-
selectivity, stable, and cyclic performance for
chemical looping combustion of methane
 
Creator Mungse, Pallavi
Saravanan, Govindachetty
Tomoki, Uchiyama
Nishibori, Maiko
Teraoka, Yasutake
Rayalu, Sadhana
Labhsetwar, Nitin
 
Subject Materials Science
 
Description Chemical looping combustion (CLC) is a key technology for oxy-fuel combustion with inherent
separation of CO2 from a flue gas, in which oxygen is derived from a solid oxygen carrier. Multi-cycle
CLC performance and the product selectivity towards CO2 formation were achieved using mixed oxide
of Cu and Mn (CuMn2O4) (Fd%3m, a = b = c = 0.83 nm) as an oxygen carrier. CuMn2O4 was prepared by
the co-precipitation method followed by annealing at 900 1C using copper(II) nitrate trihydrate and
manganese(II) nitrate tetrahydrate as metal precursors. CuMn2O4 showed oxygen-desorption as well as
reducibility at elevated temperatures under CLC conditions. The lattice of CuMn2O4 was altered
significantly at higher temperature, however, it was reinstated virtually upon cooling in the presence of
air. CuMn2O4 was reduced to CuMnO2, Mn3O4, and Cu2O phases at the intermediate stages, which
were further reduced to metallic Cu and MnO upon the removal of reactive oxygen from their lattice.
CuMn2O4 showed a remarkable activity towards methane combustion reaction at 750 1C. The reduced
phase of CuMn2O4 containing Cu and MnO was readily reinstated when treated with air or oxygen at
750 1C, confirming efficient regeneration of the oxygen carrier. Neither methane combustion efficiency
nor oxygen carrying capacity was altered with the increase of CLC cycles at any tested time. The
average oxygen carrying capacity of CuMn2O4 was estimated to be 114 mg g�1, which was not altered
significantly with the repeated CLC cycles. Pure CO2 but no CO, which is one of the possible toxic
by-products, was formed solely upon methane combustion reaction of CuMn2O4. CuMn2O4 shows
potential as a practical CLC material both in terms of multi-cycle performance and product selectivity
towards CO2 formation.
RSC
2014
Article
PeerReviewed
application/pdf
http://neeri.csircentral.net/1080/1/mungse2014.pdf
http://pubs.rsc.org/en/journals/journalissues/cp#!recentarticles&adv
Mungse, Pallavi and Saravanan, Govindachetty and Tomoki, Uchiyama and Nishibori, Maiko and Teraoka, Yasutake and Rayalu, Sadhana and Labhsetwar, Nitin (2014) Copper–manganese mixed oxides: CO2- selectivity, stable, and cyclic performance for chemical looping combustion of methane. PCCP, 16. pp. 19634-19642. ISSN 1463-9076
http://neeri.csircentral.net/1080/


oai:neeri.csircentral.net:1082
2018-01-11T09:05:06Z
7374617475733D707562
7375626A656374733D5355423534
74797065733D61727469636C65


Nitric oxide absorption by hydrogen peroxide in airlift reactor:
a study using response surface methodology
Bhanarkar, A D
Gupta, R K
Biniwale, Rajesh
Tamhane, S M
Materials Science
Absorption of nitric oxide from nitric oxide /air
mixture in hydrogen peroxide solution has been studied on
bench scale internal loop airlift reactor. The objective of
this investigation was to study the performance of nitric
oxide absorption in hydrogen peroxide solution in the airlift
reactor and to explore/determine the optimum conditions
using response surface methodology. A Box–
Behnken model has been employed as an experimental
design. The effect of three independent variables—namely
nitric oxide gas velocity, 0.02–0.11 m/s; nitric oxide gas
concentration, 300–3,000 ppm and hydrogen peroxide
concentration, 0.25–2.5 %—has been studied on the
absorption of nitric oxide in aqueous hydrogen peroxide in
the semi-batch mode of experiments. The optimal conditions
for parameters were found to be nitric oxide gas
velocity, 0.02 m/s; nitric oxide gas concentration,
2,246 ppm and hydrogen peroxide concentration, 2.1 %.
Under these conditions, the experimental nitric oxide
absorption efficiency was observed to be *65 %. The
proposed model equation using response surface methodology
has shown good agreement with the experimental
data, with a correlation coefficient (R2) of 0.983. The
results showed that optimised conditions could be used for
the efficient absorption of nitric oxide in the flue gas
emanating from industries.
Springer
2014
Article
PeerReviewed
application/pdf
http://neeri.csircentral.net/1082/1/Int%20J%20Environ%20Sci%20Technol%202014%20RSM%20Nitric%20Oxide.pdf
https://link.springer.com/journal/13762
Bhanarkar, A D and Gupta, R K and Biniwale, Rajesh and Tamhane, S M (2014) Nitric oxide absorption by hydrogen peroxide in airlift reactor: a study using response surface methodology. International Journal of Environmental Science and Technology, 11 (6). pp. 1537-1548. ISSN 1735-1472 (Print) 1735-2630 (Online)
http://neeri.csircentral.net/1082/


oai:neeri.csircentral.net:1083
2018-01-11T09:09:03Z
7374617475733D707562
7375626A656374733D5355423534
74797065733D61727469636C65


Synthesis and visible light photocatalytic activity of nanocrystalline
PrFeO3 perovskite for hydrogen generation in ethanol–water system
Tijare, S N
Bakardjieva, S
Subrt, J
Joshi, M V
Rayalu, Sadhana
Hishita, S
Labhsetwar, Nitin
Materials Science
Nanocrystalline PrFeO3 perovskite type orthoferrite was synthesized at 700â—¦C by using three different
synthesis methods, namely sol–gel, template and combustion method. The synthesized materials were
characterized by XRD, BET-SA, SEM, HRTEM, XPS, FTIR and UV-DRS techniques to understand their
physico-chemical properties. Characterization data reveal the formation of nanocrystalline PrFeO3 perovskite
composition with improved physical properties, possibly due to lower synthesis temperature used. PrFeO3 synthesized
by sol–gel method consists of crystallite size of about 20 nm with absorption maxima at 595 nm
wavelength in visible light range. This photocatalyst shows hydrogen generation of about 2847 μmol.gâ^’1.hâ^’1,
under visible light irradiation in ethanol–water system. The photocatalyst was further investigated for various
operational parameters such as photocatalyst dose variation, illumination intensity, time, etc. in a view to optimize
the hydrogen generation as well as to understand mechanistic aspects. This material appears to follow a
semiconductor type mechanism for ethanol-assisted visible light photocatalyic water-splitting and can also be
an interesting candidate to develop hetero-junction type photocatalysts.
 
Publisher Indian Academy of Sciences
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1083/1/tijare2014.pdf
Tijare, S N and Bakardjieva, S and Subrt, J and Joshi, M V and Rayalu, Sadhana and Hishita, S and Labhsetwar, Nitin (2014) Synthesis and visible light photocatalytic activity of nanocrystalline PrFeO3 perovskite for hydrogen generation in ethanol–water system. Journal of Chemical Sciences, 126 (2). pp. 517-525. ISSN 0974-3626
 
Relation http://www.ias.ac.in/Journals/Journal_of_Chemical_Sciences/
http://neeri.csircentral.net/1083/