Authors:Sachin Malwadkar, Parthasarathi Bera, M. S. Hegde, and C. V. V. Satyanarayana
Preferential oxidation of CO (CO-PROX) was carried out over Ni supported on CeO2 prepared by the co-precipitation method. The influence of metal loadings (2.5, 5 and 10 wt.% Ni) and the reaction conditions such as reaction temperature and feed composition on CO oxidation and oxidation selectivity were evaluated by using dry reformate gas. No other reactions like CO or CO2 methanation, coking, reverse water gas shift (RWGS) reaction is observed in the temperature range of 100–200 °C on these catalysts. Hydrogen oxidation dominates over CO oxidation above the temperature of 200 °C. An increase in oxygen leads to an increase in CO conversion but a simultaneous decrease in the O2 selectivity. It has been noticed that 5 and 10 % Ni/CeO2 show better catalytic activity towards CO-PROX reaction. These catalysts were characterized by SBET, XRD, TEM, XPS and H2-TPR.
Authors:G. Brahmanandhan, S. Selvasekarapandian, J. Malathi, D. Khanna, M. Rajan, and A. Hegde
The terrestrial gamma-radiation in soil and sand samples collected around Kudankulam nuclear power plant site, i.e., in Radhapuram
Taluk of Tirunelveli District has been measured using NaI(T1) gamma-ray spectrometer. In the soil samples total dose due to
three primordial radionuclides lies in the range of 13.1–168.2 nGy/h with a geometric mean of 137.2 nGy/h, which yields an
annual effective dose of 0.17 mSv/y. In the sand samples the total dose due to three primordial radionuclides has been found
to be in the range of 38.1–1964.4 nGy/h with a geometric mean of 300.8 nGy/h, which gives an annual effective dose of 0.37
mSv/y which is well below the permissible limit (1 mSv).
Authors:A. Patra, C. Joshi, M. Jha, S. Venkataraman, P. Mohandas, and A. Hegde
Atmospheric tritium activity was measured regularly around Kakrapar Atomic Power Station (KAPS) since gaseous waste which
contains tritium is being released through a 100 m high stack at KAPS site. Data collected shows a large variation of 3H concentration in air, fluctuating in the range of ≤0.2−19.9 Bq·m−3. Significantly, higher tritium levels were measured in samples at the site boundary (1.6 km) of KAPS compared to off-site
locations. The atmospheric dilution factor was found to be in the range of 1.1·10−7–2.9·10−7 s·m−3. The scavenging ratio of KAPS site was found to be varying from 0.4·104 to 16.7·104 (Bq·m−3 rain water per Bq·m−3 air). The inhalation dose to a member of general public at different distances (1.6−30 km) from KAPS site was found to be