Prof. R. P. Viswanath  
 

Personal Profile :

Name
Room
Office
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e-mail

 

: R. P. Viswanath, Ph.D.
: CYB 212
: (044) 2257 4216
: (044) 2257 6216
: C - 8/1, Vth Cross Road, IITcampus.
: rpv@iitm.ac.in ; rpviswanath@hotmail.com

 

 
Academic profile :

Research Interest :
  • Heterogeneous catalysis and material science. Involved in the development of solid materials for potential application as catalysts and other sensor materials including ferro electric materials. At present trying to develop a low cost catalyst for removal of auto exhaust pollutants as a substitute for noble metal catalyst. Another area of interest is to investigate oxide-oxide interaction of supported oxide catalysts which are industrially important for various petro chemical processes.
Monographs / Books Edited :
  1. Catalysis in chemical industries: A monograph on behalf of All India Counsil for Technical Education (AICTE), New Delhi under Academy - Industry Cooperation Programme. Ed. R. P. Viswanath, published by ICSR IITMadras (2000).
  2. Environmental Chemistry: Proceedings of Invited lectures of UNESCO Regional Training Programme (UNRTP) for Univertsity Teachers from SAARC countries, IITMadras (2001).
Recent Publications :
  1. B.Viswanathan, U.D.Mary and R. P. Viswanath, Photo-catalytic dehydrogenation of methanol on Pt/ TiO2, Indian J. Chem., 29A, 1138 (1990).
  2. U.D.Mary, B.Viswanathan and R. P. Viswanath, Photo-catalytic dehydrogenation of methanol on Pt/ TiO2:Effect of pretreatment, Poc. X National Symp. Catalysis,IIT, Madras,India pp.252 (Dec.1990).
  3. U.D.Mary, B.Viswanathan and R. P. Viswanath, Photo-catalytic and physico-chemical studies on metallised titania systems, Studies inSurface Science and Catalysis: New Frontiers in Catalysis,Eds. L.Guczi et. al. Elsevier Science B.V., Netherlands ,75, 2147-2150 (1993).
  4. R. P. Viswanath and A.T. Seshadri, The ferroelectric characteristics in Fe-Ti-O system, Solid State Communications, 92, 831-833 (1994).
  5. R. P. Viswanath and A.T.Seshadri, Magnetic susceptibility and dielectric studies on titanium oxygen system at low temperatures, Proc. 4th Int.Conf.Electro ceramics,Ed.R.Waser,RWTH Achen,Germany (Sept.1994), Vol.II,pp.1193-1196 (1994).
  6. R. P. Viswanath, V.Sudarsan and A.T.Seshadri, Dielectric and thermoelectric studies 0n TiO2 based materials, Ferroelectrics, 156, 49-54 (1994) .
  7. B.Viswanathan,U.D.Mary and R. P. Viswanath, X-ray photoelectron spectroscopic investigation of metallized (Pt,Pd,Rh andRu)titania systems, Indian J. Eng. & Mater.Sci., 1, 335-340 (1994).
  8. B.Viswanathan, R. P. Viswanath and U.D. Mary, Photo-catalytic activity of metallised titania systems, Indian J. Chem., 34A, 5 (1995).
  9. P.Madhusudan Rao,V.Sudarsan and R. P. Viswanath, Strong metal support interaction in Fe/ TiO2 system: The role of phase transformation and compound formation, Catalysis: Present and Future Eds. P.Kanta Rao and R.S.Beniwal, Wiley Eastern Ltd., New Delhi pp.218-224 (1995).
  10. P.Madhusudan Rao,B.Viswanathan and R. P. Viswanath, Strong metal support interaction state in Fe/ TiO2 system: An XPS study, J. Mater. Science 30, 4980-4985 (1995).
  11. P.Madhusudan Rao,B.Viswanathan and R. P. Viswanath, Cluster calculations and model systems of metal supported on titania or silica, Catalysis: Modern Trends Ed. N.M.Gupta and D.K.Chakrabarty, Narosa Publishing House, New Delhi pp. 536-540 (1995).
  12. R. Malathi, P. Madhusudhan Rao, and R. P. Viswanath, Metal support interaction in mixed oxide supports. Studies in surface science and catalysis. Vol. 113, Elsevier Science, Amsterdam (1998) pp 957-62.
  13. R.Malathi,P.Madhusudan Rao, B.Viswanathan and R. P. Viswanath, Surface analysis of supported platinum catalysts encapsulation model for metal support interaction: An XPS study, Indian J. Eng. and Mater. Sci., 5,285-290 (1998).
  14. R. P. Viswanath, P. Wilson, P. Madhusudhan Rao and A Mahajabeen, Characterisation and catalytic studies of supported chromium catalysts, Recent trends in catalysis, Narosa Publishing House, New Delhi, India (1999) pp 142-149.
  15. R. Malathi and R. P. Viswanath, Characterisation of supported platinum systems by spectroscopic techniques, Recent trends in catalysis, Narosa Publishing House, New Delhi, India (1999) pp 584-588.
  16. R. P. Viswanath and P.Wilson, Characterisation of ceria supported chromia catalysts, Applied Catalysis A(General), 201, 23-35 (2000).
  17. R. Malathi and R. P. Viswanath, Citral hydrogenation on supported platinum catalysts, Applied Catalysis A (General), 208, 323-327 (2001).
  18. R. P. Viswanath and P. Wilson, Catalytic combustion of Carbon, Eurasian chem Tech Journal, 3, 167-171(2001).
  19. P. Wilson, P. Madhusudhan Rao and R. P. Viswanath, Thermoanalytical Investigations on supported chromia, Thermo chemica Acta (in press).
  20. P. Wilson and R. P. Viswanath, Characterisation and catalytic studies of CrO4./TiO2 catalysts, Eurasian chem Tech Journal ( Communicated).
I Assignments Completed :

In Germany ( University of Goettingen in the West Germany) as a post doctoral fellow in a project sponsored by Deutche Forschungs Gemein Schaft (German funding agency for research projects). Involved in successfully developing a process for the the surface coating of nickel chromium alloy for preventing high temperature corrosion in chlorine atmosphere.

Developed photo catalysts and characterised them for photo decomposition of organic substrates: i) for the generation of hydrogen gas and ii) as a potential material for the photo decomposition of organic industrial pollutants (CSIR sponsored projects).

II Investigation under progress :

The catalysts presently under investigation are oxide supported systems (both interactive and otherwise).

One set of such systems eg. mixed metals (PT-Sn) supported on oxides are found to be very good for selective hydrogenation of carbonyl double bond in an a, b-unsaturated (olefinic) organic substrate having a carbonyl group. The strong metal support interaction (SMSI) observed in TiO2 supported systems has been formed to have correlations with mixed metals supported systems (CSIR supported project).

Another set of systems under investigation probes into the stability and activity of Cr6+ species. The Cr6+ species is the active component in the various catalytic reactions like polymerisation of olefins, partial oxidation of hydrocarbons and more importantly in the automobile exhaust urification. The Cr6+ in the bulk in not stable beyond ~560 k and hence making a more stable disperse active species of Cr6+ will be of great importance. The preliminary studies indicate that ceria and titania supports stabilise the Cr6+ by surface anchoring (surface interactions) and this has a large potential for increased catalytic activity. (Project supported by Tamilnadu pollution control board).

yet another aspect of current study is to develop new materials (modified alumina) for the removal of pollutants like fluoride ions (F-) from water to make them potable. The surface acidity is one of the criteria for the F- removal. The studies conducted so far has given fluoride removal to the extent of 4000 - 5000 mg/g of the material. Efforts are being made to increase this efficiency by altering the surface acidity, (funding to be sought from Pollution Control Board, Ministry of Environment, Goverment of India.)