B. Manohar

Reactivity of V2O5 with TiO2ZrO2 mixed oxide: An X-ray diffraction study☆

Abstract The reactivity of vanadia with TiO 2 ZrO 2 mixed oxide support was investigated by the X-ray powder diffraction technique. TiO 2 ZrO 2 mixed oxide was prepared by the technique of precipitation from homogeneous solution. Ammonium metavanadate was used as a source of vanadia, and V 2 O 5 contents varied from 2 to 16 wt%. Calcination of Ti- and Zr-hydroxides at 773 K result in the formation of an amorphous phase, and further heating at 873 K converts this amorphous phase into a crystalline TiO 2 · ZrO 2 compound. This compound is quite stable in the absence of V 2 O 5 . Addition of V 2 O 5 and heating of the samples beyond 873 K result in the formation ZrV 2 O 7 , with the simultaneous presence of TiO 2 rutile phase. Quantities of these phases increase with increasing in V 2 O 5 content.

Mo-ZrO2 Solid Acid Catalyst For Transesterification of β-Ketoesters

Abstract An efficient and mild method for transesterification of β-ketoester catalyzed by Mo-Z1O2 solid acid catalyst is described.

Esterification by ZrO2 and Mo-ZrO2 ECO-Friendly Solid Acid Catalysts

Abstract Esterification of mono-and dicarboxylic acids catalysed by single (ZrO2) and mixed oxide (Mo-ZrO2) eco-friendly solid acid catalysts is described. The Mo-ZrO2 catalyst exhibits better catalytic performance than ZrO2.

Synthesis of isobutyraldehyde from methanol and ethanol over mixed oxide supported vanadium oxide catalysts

Abstract A one step synthesis of isobutyraldehyde from methanol and ethanol over mixed oxide (TiO2-Al2O3, TiO2-SiO2, TiO2-ZrO2 and TiO2-SiO2-ZrO2) supported vanadium oxide catalysts was investigated at atmospheric pressure and 350 °C. The V2O5/TiO2-SiO2 catalyst showed a better performance in terms of total conversion and product selectivity than the other catalyst systems.

A single-step synthesis of isobutyraldehyde from methanol and ethanol over CuO–ZnO–Al2O3 catalyst

Selective synthesis of isobutyraldehyde from methanol and ethanol in a single step over CuO–ZnO–Al2O3 catalyst is reported.

One step synthesis of acetonitrile from ethanol via ammoxidation over Sb–V–P–O/Al2O3 catalyst

Selective synthesis of acetonitrile in one step from ethanol by ammoxidation is reported, for the first time, using alumina supported and antimony promoted vanadium phosphorus oxide catalyst.

Ammoxidation of 3-picoline to nicotinonitrile over vanadium phosphorus oxide-based catalysts

Ammoxidation of 3-picoline to nicotinonitrile was investigated on vanadium phosphorus oxide (VPO), VPO/SiO 2 and additive atom (Cu, Zr, Mn and Co) incorporated VPO catalysts under atmospheric pressure and at 673 K. For the purpose of comparison a conventional V 2 O 5 -MoO 3 /Al 2 O 3 catalyst was also studied under identical conditions. These catalysts were characterized by means of X-ray diffraction, electron spin resonance, infrared, ammonia chemisorption and BET surface area methods. The VPO-based catalysts show better performance than the V 2 O 5 -MoO 3 /Al 2 O 3 catalyst. Further, the VPO/SiO 2 and VPO catalysts exhibit better conversion and product selectivities than the additive-containing VPO catalysts. Better activity of VPO and VPO/SiO 2 catalysts was related to their high active surface area, higher surface acidity and lower oxidation state of vanadium. The redox couple between (VO) 2 P 2 O 7 (V 4+ ) and α I -VOPO 4 (V 5+ ) phases appears to be responsible for the ammoxidation activity of VPO catalysts.

Aniline synthesis from cyclohexanol and ammonia over mixed oxide catalysts

Abstract Aniline is obtained by amination of cyclohexanol followed by oxidative dehydrogenation over MoO 3 /Al 2 O 3 , V 2 O 5 –MoO 3 /Al 2 O 3 and NiO–MoO 3 /Al 2 O 3 mixed oxide catalysts in the presence of ammonia and air in vapour phase at 623–723 K under atmospheric pressure.

Solid–solid wetting: a simple and effective method for the preparation of molybdenum sulphide/alumina catalysts

The spreading of MoS2 on an Al2O3 support under thermal treatment at 723 K in the presence of a CS2–H2 atmosphere results in a dispersed phase, which exhibits activity for thiophene hydrodesulphurisation comparable with a conventional catalyst.

One-step synthesis of adiponitrile by catalytic ammoxidation over antimony–vanadium phosphorus oxide/γ-alumina catalyst

The selective synthesis of adiponitrile from cyclohexanol, cyclohexanone, cyclohexane and n-hexane in a single step by vapour-phase ammoxidationoveran antimony-promoted vanadium phosphorus oxide catalyst supported on alumina s reported