NOPR Collection:

Unusual catalytic activity of iron containing mesoporous materials for synthesis of diphenylmethane

Tue, 01 Apr 2014 00:00:00 GMT

Title: Unusual catalytic activity of iron containing mesoporous materials for synthesis of diphenylmethane Authors: Kanchamreddy, Raveendranath Reddy; Mutyala, Suresh; Kantam, M Lakshmi; Srinivasu, Pavuluri Abstract: Mesoporous ferrosilicates with various Si/Fe mole ratios have been prepared for the Friedel-Crafts alkylation reaction to synthesize diphenylmethane selectively under solvent-free reaction conditions. Mesoporous ferrosilicates (PS-1) have high BET specific surface area (ca. 1050 m² g^-1) and ordered pore structure. The incorporation of iron into the framework of mesoporous silica is characterized and confirmed by various techniques such as XRD, N₂-sorption and FTIR. The nitrogen sorption results show that the sample with Si/Fe mole ratio of 46 possesses improved textural properties as compared with 91 and 125 mole ratios. The catalytic activity of PS-1 catalysts has been tested in the Friedel-Crafts alkylation of aromatic compound for the selective synthesis of diphenylmethane. The results of the alkylation reaction indicate that the PS-1(46) catalyst shows higher activity as compare to other mesoporous ferrosilicates prepared under similar experimental conditions. Page(s): 576-579

Catalytic dehydration of 1-phenylethanol over chromia-carbon composite derived from metal organic framework, CrMIL-101

Tue, 01 Apr 2014 00:00:00 GMT

Title: Catalytic dehydration of 1-phenylethanol over chromia-carbon composite derived from metal organic framework, CrMIL-101 Authors: Mutyala, Suresh; Kanchamreddy, Raveendranath Reddy; Jonnalagadda, Madhavi; Burri, David Raju; Rao, Kamaraju Seetha Rama; Kantam, M Lakshmi; Srinivasu, Pavuluri Abstract: The synthesis and characterization of a new composite material containing chromia and carbon using metal organic framework (Cr-MIL-101) is presented. The dispersion of chromia particles on carbon material by direct thermal treatment of Cr-MIL-101 containing terephthalate is also described. The investigation of removal of guest molecules in Cr-MIL-101 leading to the formation of chromia in the temperature range of 373-473 K has been studied. The catalytic activity of the composite material for dehydration of 1-phenylethanol is tested as a possible application. The composite catalytic system can be used up to 10 h without significant loss of activity. Page(s): 572-575

Synthesis and characterization of Pt supported on Fe₅(PO₄)₃(OH)₅catalysts

Sat, 19 Apr 2014 12:36:32 GMT

Title: Synthesis and characterization of Pt supported on Fe₅(PO₄)₃(OH)₅catalysts Authors: Kumar, P Anil; Padmasri, A Hari; Kumar, S Naveen; Venugopal, A; Singh, Sooboo Abstract: Pt supported on iron hydroxyphosphate catalysts has been synthesized and characterized by various adsorption and spectroscopic methods. X-ray diffraction patterns of the supported and unsupported catalysts indicate a very weak diffraction line due to the Fe₅(PO₄)₃(OH)₅ phase. The X-ray photoelectron spectroscopic studies reveal a surface composition attributed to Fe₅(PO₄)₃(OH)₅ species. The temperature programmed sequential reduction-oxidation-reduction of 1wt.% Pt/Fe₅(PO₄)₃(OH)₅ indicates the absence of H₂ spillover due to Pt on the Fe₅(PO₄)₃(OH)₅ support. The temperature programmed reduction studies also show the non-reducible behavior of Fe₅(PO₄)₃(OH)₅ phase. Page(s): 566-571

Synthesis, characterization and studies on optical properties of indium doped ZnO nanoparticles

Sat, 19 Apr 2014 12:35:51 GMT

Title: Synthesis, characterization and studies on optical properties of indium doped ZnO nanoparticles Authors: Sharma, Manu; Jeevanandam, P Abstract: Indium doped zinc oxide hierarchical nanostructures have been synthesized using a simple aqueous solution based method. A change in morphology from hierarchical nanostructures in ZnO to nanorods after doping with indium has been observed. The optical properties of nanostructures have been investigated using diffuse reflectance and photoluminescence spectroscopy. The band gap of zinc oxide nanoparticles changes after the incorporation of indium and a blue shift of band gap is observed. Page(s): 561-565

NOPR Collection:

Unusual catalytic activity of iron containing mesoporous materials for synthesis of diphenylmethane

Catalytic dehydration of 1-phenylethanol over chromia-carbon composite derived from metal organic framework, CrMIL-101

Synthesis and characterization of Pt supported on Fe5(PO4)3(OH)5 catalysts

Synthesis, characterization and studies on optical properties of indium doped ZnO nanoparticles

Synthesis and characterization of Pt supported on Fe₅(PO₄)₃(OH)₅catalysts