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- ONECSIR
| Designation: |
Sr. Scientist
|
| Email Id: | yb_pakade[at]neeri[dot]res[dot]in |
| Qualification: |
B.Sc., M.Sc., Ph.D |
| Specialization: |
Analytical Chemistry
|
| Address: |
Vertical 2 : Environmental Chemical Processes & System Design, NEERI, Nagpur
|
| Biodata: |
| Sr. No. | Publication Name |
|---|---|
| 1 |
Application of microwave synthesized Ag-Rh nanoparticles in cyclohexane dehydrogenation for enhanced H2 delivery
The catalytic dehydrogenation of liquid organic hydrides (LOH) is a promising route to deliver H2 for various mobile and stationary applications. However, an efficient and low-cost dehydrogenation catalyst, as an alternative to Pt, is a key for the success of LOH-based H2 supply. In a quest for such catalysts, we synthesized stable Ag-Rh bimetallic nanoparticles (BNP) supported on activated carbon cloth (ACC) and Y2O3 using the microwave-assisted polyol technique. The performance of these catalysts during dehydrogenation of LOH viz., cyclohexane, was evaluated at 300 ?C using an advanced spray-pulse reactor system. The Ag:Rh ratio was optimized to maximize the cyclohexane conversion and H2 evolution. The effect of Ag:Rh ratio, catalyst support, and synthesis method was investigated, too. The most stable H2 evolution performance was exhibited by microwave-synthesized 1:4 Ag-Rh/Y2O3 catalyst with the cyclohexane conversion, dehydrogenation rate and H2 evolution rate of 35.8%, 17.2 mmol/gMet/min and 400 mmol/gMet/min, respectively. Finally, the performance of catalysts used in this study was compared with the Pt-based catalysts. |
| 2 |
On H2 supply through liquid organichydrides e Effect of functional groups
Liquid organic hydride (LOH) based H2 supply systems possess an excellent potential to overcome the obstacles of upcoming ?hydrogen economy?. However, their efficiency mainly relies on the choice of organic hydride and the dehydrogenation catalyst. In the present study, we focused on the former to strengthen the understanding of H2 supply through LOH dehydrogenation. We investigated the role of various functionalities viz., methyl group, N heteroatom, cyclic ring and their combinations in LOH dehydrogenation. Several simple representative LOH's such as methylcyclohexane, piperidine, 4-methylpiperidine and decalin were considered and their dehydrogenation was studied over a 5 wt% Pt/ ACC catalyst in a spray pulse reactor at 350 C. The H2 evolution rates were found to follow the trend: cyclohexane < methylcyclohexane < piperidine < 4-methylpiperidine < decalin. The inductive effects caused by these functional groups and their impact on H2 evolution were comprehensively described. Finally, the results were compared with the benchmark reaction, cyclohexane dehydrogenation to benzene. |
| 3 |
Methyl acrylate modified apple pomace as promising adsorbent for the removal of divalent metal ion from industrial wastewater
Polymerized apple pomace (PoAP) surface was evaluated as adsorbent for the removal of Pb+2, Cd+2, and Ni+2 ions from aqueous solution. PoAP was characterized by FTIR, SEM, EDS, XRD, and BET surface area analyzer. Furthermore, the adsorption influencing parameters such as dose, pH, time, concentration, and temperature were optimized for maximum removal of metal ions from aqueous solution. The maximummonolayer adsorption capacity of PoAP was found to be 106, 34.12, and 19.45 mg, for Pb+2, Cd+2, and Ni+2 ions respectively, using the Langmuir isotherm model. The rate of adsorption was evaluated using pseudo-second order kinetics and intra-particle diffusion. The adsorption data followed pseudo-second order kinetic with the correlation coefficient ( r 2) from 0.99 at al l concentration. Thermodynamic study revealed endothermic nature of Pb+2 and Cd+2 adsorption and exothermic for Ni+2 ions. The rate of adsorption for binary and tertiary mixtures of Pb+2, Ni+2, and Cd+2 metal ion was studied using the ideal adsorbed solution theory. The regeneration study revealed that PoAP could be re-utilized up to 4 cycles for Pb+2 and 2 cycles for Cd+2 and Ni+2 ions. PoAP was successfully applied to real industrial wastewater for the removal of Pb+2, Cd+2, and Ni+2 ions. |
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