02088nas a2200181   4500008004100000022001400041245010100055210006900156260011000225300001600335490000600351520132500357100002201682700002801704700002701732700002201759856012501781       2016                        eng d  a2046-206900aCatalytic activity of bare and porous palladium nanostructures in the reduction of 4-nitrophenol0 aCatalytic activity of bare and porous palladium nanostructures i  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJAN  a11911-119200 v63 a<p>The catalytic activity of bare and porous palladium nanostructures viz. palladium nanoballs (PdNBs) and palladium urchins (Pdurc) synthesized in surfactant based liquid crystalline mesophase have been investigated in the reduction of 4-nitrophenol. The loading of PdNBs and Pdurc nanocatalyst in the reaction are optimized to 1.57 x 10(-4) mol% and 1.57 x 10(-3) mol% respectively. The surface area normalized rate constant obtained at 303 K for PdNBs (0.74 +/- 0.03) s(-1) m(-2) L and Pdurc (0.41 +/- 0.05) s(-1) m(-2) L is the highest, considering the low palladium loading used in the reaction. The specific surface area determined for the PdNBs and Pdurc are 153 m(2) g(-1) and 27 m(2) g(-1) respectively. The high surface area of PdNBs nanostructure is consistent with the highest catalytic activity. The palladium nanostructure catalyzed reaction lacks induction time (t(0)), indicating the influence of porosity in the Langmuir-Hinshelwood mechanism. Besides, PdNBs and Pdurc exhibited thermal stability and structural integrity with good conversion of the substrate (&gt;97%) even up to five consecutive reactions. The mechanistic insight of the bare and porous palladium nanostructures presented in this study is significant for the development of stable and efficient palladium metal based nanocatalyst.</p>1 aKalekar, Ajit, M.1 aSharma, Kiran, Kumar K.1 aLuwang, Meitram, Niraj1 aSharma, Geeta, K.  uhttps://library.ncl.res.in/content/catalytic-activity-bare-and-porous-palladium-nanostructures-reduction-4-nitrophenol-0