01600nas a2200217 4500008004100000022001400041245012300055210006900178260010500247300001200352490000800364520070000372653003101072653003801103653002701141653002301168100002601191700001401217700002201231856012901253 2005 eng d a0253-413400aHighly active and reusable catalyst from Fe-Mg-hydrotalcite anionic clay for friedel-crafts type benzylation reactions0 aHighly active and reusable catalyst from FeMghydrotalcite anioni aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACADEMY SCIENCEScNOV a635-6390 v1173 a

Fe-Mg-hydrotalcite (Mg/Fe = 3) anionic clay with or without calcination (at 200-800 degrees C) has been used for the benzylation of toluene and other aromatic compounds by benzyl chloride. Hydrotalcite before and after its calcination was characterized for surface area, crystalline phases and basicity. Both the hydrotalcite, particularly after its use in the benzylation reaction, and the catalyst derived from it by its calcination at 200-800 degrees C show high catalytic activity for the benzylation of toluene and other aromatic compounds. The catalytically active species present in the catalyst in its most active form are the chlorides and oxides of iron on the catalyst surface.

10aactivation by calcinations10abenzylation of aromatic compounds10abenzylation of toluene10aFe-Mg-hydrotalcite1 aChoudhary, Vasant, R.1 aJha, Rani1 aChoudhari, P., A. uhttps://library.ncl.res.in/content/highly-active-and-reusable-catalyst-fe-mg-hydrotalcite-anionic-clay-friedel-crafts-type-002001nas a2200265 4500008004100000022001400041245014200055210006900197260009500266300001000361490000800371520084800379653003701227653001301264653004301277653002901320653005801349653003101407653005201438653004001490100002601530700002401556700002401580856013101604 2005 eng d a0021-951700aHigh-temperature stable and highly active/selective supported NiCoMgCeOx catalyst suitable for autothermal reforming of methane to syngas0 aHightemperature stable and highly activeselective supported NiCo a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJUL a36-400 v2333 a

Low-surface-area, macroporous, zirconia-haffnia-supported NiCoMgOx and NiCoMgCeOx (Ni/Co/Mg/Ce = 1/0.2/1.2/0.0 or 1.2) catalysts, precalcined at high temperature ( 1400 degrees C for 4 h), showed both high activity (> 98% conversion) and selectivity ( > 95%) in the catalytic partial oxidation of methane (CPOM) to syngas. Their performance remained unchanged even after they were subjected to higher temperature (> 2000 degrees C for 30 min) or a number of high-temperature (> 2000 degrees C) shocks, due to their direct exposure to an oxyacetylene flame. The supported NiCoMgCeOx, however, showed superior performance in the steam and CO2 reforming reactions because of its much higher lattice oxygen mobility. Hence it is more suitable for the autothermal reforming of methane. (c) 2005 Elsevier Inc. All rights reserved.

10aautothermal reforming of methane10aCatalyst10acatalytic partial oxidation of methane10aCO2 reforming of methane10ahigh-temperature stable supported NiCoMgCeOx catalyst10asteam reforming of methane10azirconia-haffnia-supported NiCoMgCeOx catalysts10azirconia-haffnia-supported NiCoMgOx1 aChoudhary, Vasant, R.1 aMondal, Kartick, C.1 aMamman, Ajit, Singh uhttps://library.ncl.res.in/content/high-temperature-stable-and-highly-activeselective-supported-nicomgceox-catalyst-suitable-001226nas a2200193 4500008004100000022001400041245017100055210006900226260006100295300001000356490000700366520039900373653003400772653002200806653003300828100002600861700001600887856012900903 2005 eng d a1011-372X00aHydrogen peroxide formation in the interaction of oxygen with boron-containing Pd catalysts prereduced by hydrazine in aqueous acidic medium containing bromide anions0 aHydrogen peroxide formation in the interaction of oxygen with bo a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcJAN a79-810 v993 a

Interaction of molecular oxygen with Pd/BPO4 or ZrO2 (or Al2O3, CeO2, TiO2) - B2O3 catalysts, prereduced by hydrazine hydrate, in an aqueous acidic (H2SO4 or H3PO4) reaction medium containing bromide ions leads to the formation of H2O2. However, in the absence of boron in the catalyst and also in the absence of acid and/or bromide ions in the reaction medium, almost no H2O2 is formed.

10aboron-containing Pd catalysts10aHydrogen peroxide10aoxygen-catalyst interactions1 aChoudhary, Vasant, R.1 aSamanta, C. uhttps://library.ncl.res.in/content/hydrogen-peroxide-formation-interaction-oxygen-boron-containing-pd-catalysts-prereduced-002341nas a2200169 4500008004100000022001400041245015100055210006900206260007100275300001400346490000700360520161300367100002601980700002202006700001802028856012502046 2007 eng d a0888-588500aHydrogenation of hydrogen peroxide over palladium/carbon in aqueous acidic medium containing different halide anions under static/flowing hydrogen0 aHydrogenation of hydrogen peroxide over palladiumcarbon in aqueo a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a3237-32420 v463 a

Kinetics of the hydrogenation of hydrogen peroxide (at 278 and/or 300 K) over Pd(5 wt%)/carbon in aqueous medium with or without containing acid or different halide anions (F-, Cl-, Br-, or I-) under static H-2 (i.e. batchwise) or flowing H-2 (i.e. semi-batchwise) at atmospheric pressure have been thoroughly studied. In the absence of protons or halide anions and also in the presence of F- anions, a very rapid decomposition of H2O2 (H2O2 -> H2O + 0.5O(2)) predominates over the H2O2 hydrogenation (H2O2 + H-2 -> 2H(2)O). However, in the presence of both the protons and Cl- or Br- anions, the H2O2 conversion occurs mainly by the hydrogenation reaction. The hydrogenation is found to be a zero-order reaction with respect to the H2O2 concentration, and its activation energy and frequency factor are strongly influenced by the halide anions. The hydrogenation is found to be more and more inhibited with increasing halide (Cl- or Br-) anion concentration. The cations associated with the halide anions have, however, only a very little influence on the hydrogenation. Iodide anions act as a very strong catalyst poison for the hydrogenation. In the presence of acid, the hydrogenation is very strongly influenced by the different halides, but, in the presence of halide anions (5.4 mmol/dm(3)), it is very mildly influenced by the different mineral acids (except HI). In the absence of protons, the Cl- and Br- anions are ineffective for inhibiting the rapid H2O2 decomposition. A role played by protons and halide anions for drastically inhibiting the rapid H2O2 decomposition is discussed.

1 aChoudhary, Vasant, R.1 aSamanta, Chanchal1 aJana, Prabhas uhttps://library.ncl.res.in/content/hydrogenation-hydrogen-peroxide-over-palladiumcarbon-aqueous-acidic-medium-containing01468nas a2200217 4500008004100000022001400041245015100055210006900206260007500275300001000350490000700360520061300367653002000980653001301000653003101013653002501044653001201069653001701081100002601098856012601124 2013 eng d a0369-820300aHighly efficient catalyst derived from Ni-Fe-hydrotalcite for solvent-free O- or S-acetylation of alcohols, phenols and thiols at room temperature0 aHighly efficient catalyst derived from NiFehydrotalcite for solv a5 LAJPATRAI RD, ALLAHABAD 211002, INDIAbNATL ACAD SCIENCES INDIAcMAR a15-190 v833 a

Solvent-free O-acetylation of alcohols (including secondary and tertiary alcohols) and phenols and S- acetylation of thiols by acetyl chloride with high product yields at room temperature in a very short reaction period can be easily accomplished using a small amount of solid catalyst obtained from the decomposition (at 600 A degrees C) of Ni-Fe-hydrotalcite. Both the reactions are carried out at room temperature under solvent-free conditions. The catalyst can be easily separated from the reaction mixture, simply by filtration and reused several times without a significant loss of its activity.

10aAcetyl chloride10aAlcohols10aNi-Fe- ht derived catalyst10aO- and S-acetylation10aPhenols10aSolvent-free1 aChoudhary, Vasant, R. uhttps://library.ncl.res.in/content/highly-efficient-catalyst-derived-ni-fe-hydrotalcite-solvent-free-o-or-s-acetylation-0