King Abdulaziz City for Science and Technology

Ahmad Alshammari

Abdulaziz Bagabas

Zeid A Al-Othman

Mohamed Mokhtar M Mostafa

Reda M Mohamed

Mohamed F A Aboud

Andreas Martin

Angela Koeckritz

Narayana Venkata Kalevaru

The present invention relates to a method for preparing dicarboxylic acids from saturated and cycloaliphatic hydrocarbons by oxidation at a reaction temperature comprised in the range of 25 to 300&#xb0; C. in an autoclave using a solid heterogeneous catalyst. More particularly, the method of the invention relates to a method for preparing adipic acid (AA) from cyclohexane (CH) by selective oxidation.

Method for preparation of dicarboxylic acids from saturated hydrocarbons or cycloaliphatic hydrocarbons by catalytic oxidation

A simple, room-temperature method of producing zinc oxide nanoparticles was established by reacting zinc nitrate hexahydrate and cyclohexylamine (CHA) in either aqueous or ethanolic medium. Particles of polyhedra morphology were obtained for zinc oxide, prepared in EtOH (ZnO) and zinc oxide prepared in water (ZnO). The results indicate that there are significant morphological differences between ZnOand ZnO. ZnOshowed a regular polyhedral shape, while spherical and chunky particles were observed for ZnO. The morphology was crucial in enhancing the cyanide ion photocatalytic degradation efficiency of ZnOby a factor of 1.5 in comparison to the efficiency of ZnOat equivalent loading of 0.0166 ZnO nanoparticles wt %.

Zinc-oxide nanoparticles and their use for photo catalytic degradation of cyanide

A simple, room-temperature process of using zinc oxide nanoparticles was established by reacting zinc nitrate hexahydrate and cyclohexylamine (CHA) in either aqueous or ethanol medium. Particles of polyhedra morphology were obtained for zinc oxide, prepared in EtOH (ZnO) and zinc oxide prepared in water (ZnO). The results indicate that there are significant morphological differences between ZnOand ZnO. ZnOshowed a regular polyhedral shape, while spherical and chunky particles were observed for ZnO. The morphology was crucial in enhancing the cyanide ion photocatalytic degradation efficiency of ZnOby a factor of 1.5 in comparison to the efficiency of ZnOat equivalent loading of 0.0166 ZnO nanoparticles wt %.

Zinc-oxide nanoparticles and their use for photo catalytic degradation of cyanide&#x2014;a process

A simple, room-temperature method of producing zinc oxide nanoparticles was established by reacting zinc nitrate hexahydrate and cyclohexylamine (CHA) in either aqueous or EtOHic medium. Particles of polyhedra morphology were obtained for zinc oxide, prepared in EtOH (ZnO), while an irregular spherical morphology, mixed with some chunky particles forzinc oxide prepared in water (ZnO). The results indicate that there are significant morphological differences between ZnOand ZnO. ZnOshowed a regular polyhedral shape, while spherical and chunky particles were observed for ZnO. The morphology was crucial in enhancing the cyanide ion photocatalytic degradation efficiency of ZnOby a factor of 1.5 in comparison to the efficiency of ZnOat equivalent loading of 0.02 ZnO nanoparticles wt %. Increasing the loading wt % of ZnOfrom 0.01 to 0.07 led to an increase in the photocatalytic degradation efficiency from 67% to 90% after 45 minutes and a doubling of the first-order rate constant (k).

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Riyadh, Saudi Arabia

Ahmad Alshammari