King Abdulaziz City for Science and Technology

International Business Machines Corporation

Abdulaziz Bagabas

Mohammed Abdullah Bahattab

Zeid A Al-Othman

Abdulrahman A Al-Rabiah

Mohamed Mokhtar Mohamed Mostafa

Ahmad Alshammari

Ibrahim M Al-Najjar

Reda M Mohamed

Mohamed F A Aboud

Mohamed Mokhtar M Mostafa

Vagif Melik Akhmedov

Robert Dennis Miller

John Campbell Scott

John David Bass

Qing Song

Xin Ai

Vagif Malik Akhmedov

Emad Addurihem

Akhmedov Vagif Malik

Musaed A Alangari

Ahmed S Alshammari

Mohamed F Aboud

A method of forming CuFeSchalcopyrite nanoparticles. The method includes, in the presence of one or more ligands, reacting an iron-containing compound, a copper-containing compound and a sulfur-containing compound to form CuFeSchalcopyrite nanoparticles; and wherein at least one of the ligands forms a coordination complex with copper, and at least one of the ligands forms a coordination complex with iron. Also a method of forming metal-doped CuFeSchalcopyrite nanoparticles such as Zn-doped CuFeSchalcopyrite nanoparticles. Also, a CuFeSchalcopyrite nanoparticle layer on a substrate. Also, a composition of matter including Zn-doped CuFeSchalcopyrite nanoparticles. Also, a Zn-doped CuFeSchalcopyrite nanoparticle layer on a substrate.

Methods for making doped and undoped copper chalcopyrite nanoparticles and thin films thereof

A simple, room-temperature method of producing CuO-doped zinc oxide nanoparticles was established by reacting zinc nitrate hexahydrate, copper nitrate trihydrate and cyclohexylamine (CHA) at room temperature. These nanoparticles may be used for photocatalytic degradation of cyanide in aqueous solutions. The degradation of cyanide is effective because electrons transfer from the p-type copper oxide to the n-type zinc oxide.

Synthesis of copper oxide-doped zinc-oxide nanoparticles and their use

Methods and systems of preparing a catalyst to be used in the synthesis of carbon nanotubes through Chemical Vapor Depositions are disclosed. The method may include a mixture comprising at least one of an iron catalyst source and a catalyst support. In another aspect, a method of synthesizing multi-walled carbon nanotubes using the catalyst is disclosed. The method may include driving a reaction in a CVD furnace and generating at least one multi-walled carbon nanotube through the reaction. The method also includes depositing the catalyst on the CVD furnace and driving a carbon source with a carrier gas to the CVD furnace. The method further includes decomposing the carbon source in the presence of the catalyst under a sufficient gas pressure for a sufficient time to grow at least one multi-walled carbon nanotube.

Combination catalysts based on iron for the substantial synthesis of multi-walled carbon nanotubes by chemical vapor deposition

Isopropyl alcohol is a very useful chemical that is widely used in the industry as a solvent. Economical and easy process to make ispopropyl alcohol using novel composite catalyst is described in the instant application. Production of isopropyl alcohol (IPA) from dimehtyl ketone (DMK) and hydrogen (H) in gas-phase using a ruthenium nano-particle-supported on activated charcoal/nano-zinc oxide composite catalyst is described. Gas phase production of isopropyl alcohol using DMK and hydrogen is also described using optimal time on stream, temperature, catalyst ratio and DMK/Hratio. Ruthenium nano-zinc oxide composite catalyst is formulated using different ratios of ruthenium activated charcoal and n-ZnO is described. CAT-IV is shown to be the best performer for the efficient production of isopropyl alcohol.

Composite catalyst and using the same for making isopropyl alcohol

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).

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

Ruthenium/activated charcoal (Ru/AC) treated with synthesized nano-ZnO (n-ZnO) is used for the first time as a novel composite catalyst in one-step self-condensation of acetone (DMK) to methyl isobutyl ketone in the gas phase. The DMK self-condensation was performed under atmospheric pressure, in a tubular glass fixed-bed microreactor, under DMK and Hcontinuous flow at temperature in the range of 523 to 648 K. Addition of n-ZnO to Ru/AC resulted in a pronounced increase in the degree of dispersion of Ru and in the acidic/basic sites concentration ratio. For the one-step synthesis of MIBK at 623 K, the composite catalyst with 2.5 wt % Ru loading was an active and selective bi-functional composite catalyst with balanced acid/base and hydrogenation properties. At 523 K, isopropyl alcohol, product of DMK-direct hydrogenation, was produced in high selectivity for instantly investigated composite catalyst. The catalytic performance depended on the composite catalyst identity, DMK flow rate, Hflow rate, and reaction temperature.

Synthesizing and utilizing novel ruthenium nanoparticle-activated charcoal-nano-zinc oxide composite catalyst

A low-pressure one-step gas-phase process for the production and recovery of methyl isobutyl ketone (MIBK) is disclosed. One-step gas-phase synthesis of MIBK from acetone and hydrogen over nano-Pd/nano-ZnCrOcatalyst at atmospheric pressure is used as an example. The said process is designed to recover the additional heat associated with the reactor effluent via heating acetone feed and recycle (mixed acetone) before entering the reactor. A compressor is introduced to the gas-phase process to increase slightly the reactor effluent pressure before this effluent is cooled and fed to a flash drum. The compressed reactor effluent is used to preheat hydrogen feed and recycle (mixed hydrogen) before entering the reactor. The separation scheme of low-pressure one-step gas-phase process comprises of several distillation columns used for MIBK separation and purification.

Low pressure one-step gas-phase process for production of methyl isobutyl ketone

Several metal-supported catalyst compositions based on nano-crystalline zinc oxide were synthesized and characterized by X-ray powder diffraction (XRD), Carbon dioxide temperature programmed desorption (COTPD), and nitrogen adsorption at &#x2212;196&#xb0; C. The Pd-supported nano-ZnO mixed with different oxides such as CrO, CrO, MgO, and &#x3b3;-AlOshowed high catalytic activity in acetone condensation in gas-phase process under hydrogen flow. This reaction involves the base-acid coupling of acetone to form mesityl oxide, followed by its hydrogenation to methyl isobutyl ketone (MIBK). The novel catalyst 1% wt. n-Pd/n-ZnCrOwas utilized during gas-phase reaction during production of MIBK. MIBK selectivity was 70-72% at 66-77% acetone conversion at 300-350&#xb0; C. Diisobutyl ketone (DIBK) was the main by-product, with a total MIBK+DIBK selectivity up to 88%. The prepared catalysts showed stable activity and may be used repeatedly and for a longer period of time.

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Riyadh, Saudi Arabia

Abdulaziz Bagabas