The present study investigates a process for the selective production of hydrogen from the cataly... more The present study investigates a process for the selective production of hydrogen from the catalytic decomposition of formic acid in the presence of iridium and iridium–palladium nanoparticles under various conditions. It was found that a loading of 1 wt.% of 2% palladium in the presence of 1% iridium over activated charcoal led to a 43% conversion of formic acid to hydrogen at room temperature after 4 h. Increasing the temperature to 60 °C led to further decomposition and an improvement in conversion yield to 63%. Dilution of formic acid from 0.5 to 0.2 M improved the decomposition, reaching conversion to 81%. The reported process could potentially be used in commercial applications.
Journal of Inorganic and Organometallic Polymers and Materials, 2022
Herein, we report a strategy to synthesize zinc oxide nanoparticles (ZnO NPs) from Clitoria terna... more Herein, we report a strategy to synthesize zinc oxide nanoparticles (ZnO NPs) from Clitoria ternatea flower extract through green synthesis platform. The bioactive components in the C. ternatea flower extract acts as a stabilizing and capping agent, which enables the synthesis of ZnO NPs without the use of chemical reagents. Synthesis of of ZnO NPs through green platform was confirmed by analytical characterization techniques such as UV–Vis spectrophotometry, XRD, FTIR, DLS, Zeta potential, TEM, and EDX methods. The surface morphology and average size of ZnO NPs investigated through TEM and DLS results indicates rod shaped structure with average particle size of 84 nm. Green synthesized ZnO NPs shows excellent antibacterial, antibiofilm, and antioxidant activity which is dose-dependent. These ZnO NPs have cytotoxicity against breast cancer cells (MCF-7). The MTT test revealed a concentration-dependent inhibitory effect on MCF-7 cells, with IC50 being 12.1 g/ml, and their anticancer potential was detected utilizing live and dead cell assays LDH release, Ao/EtBr), DAPI, ROS, and caspase-3 activation assays. Finally, the findings of these results shows that ZnO NPs derived from C. ternatea flower extract are highly potential candidates to treat bacterial infection and human breast cancer.
Despite a number of reports on synthetic methods for 1,1'- binaphthyl molecules with a substi... more Despite a number of reports on synthetic methods for 1,1'- binaphthyl molecules with a substitution in certain positions, to the best of our knowledge neither the synthesis of binaphthyl-based chiral dendrimers by 1,3-cycloaddition reactions, "Click" chemistry, or attempts to achieve the substitution in multiple potential positions on binaphthyl cores has been studied yet. Previously reported optically active binaphthyl-based dendrimers have shown application in a number of applications, such as in asymmetric catalysts, enantioselective fluorescent sensors and chiral molecular recognition. Therefore, this project will focus on the synthesis of some novel chiral multiply functionalized 1,1'-binaphthyl molecules, including those that contain suitable groups to enable "Click" reactions and to facilitate the synthesis of some symmetric and asymmetric chiral dendrimers.
Abstract Using gold and palladium supported catalysts, the selective hydrogenation of furfuryl al... more Abstract Using gold and palladium supported catalysts, the selective hydrogenation of furfuryl alcohol into 2-methylfuran at 25 °C was examined. The use of 2-methylfuran has become applicable in the perfumery and personalised care product industry, and it has been shown that there are two conditions under which Au:Pd/SiO2 catalysts are successful for selectivity to 2-methylfuran at 25 °C and (1 bar, H2). Moreover, this study has shed light on the effectiveness of several reaction conditions (supports and catalyst amount).
The selective hydrogenation of furfural at ambient temperature has been investigated using a Pd/T... more The selective hydrogenation of furfural at ambient temperature has been investigated using a Pd/TiO2 catalyst.
The selective hydrogenation of furfuryl alcohol into 2-methylfuran was investigated at room tempe... more The selective hydrogenation of furfuryl alcohol into 2-methylfuran was investigated at room temperature using palladium supported catalysts.
Hydrogenation is one of the major processes used in commercial and academic applications in the m... more Hydrogenation is one of the major processes used in commercial and academic applications in the manufacture of chemical intermediates; high tonnage products of high value, and useful chemicals, such as agrochemicals and pharmaceuticals. Free solvent hydrogenation of cyclohexanol using Au, Au:Pd and Pd/CsxH0.5PW12O40 catalysts have been performed in the liquid phase. Reaction conditions, for example supports with/without Cs-salt loading, metal loading and/or ratio were varied to achieve ideal conditions. The Palladium supported on Cs2.5H0.5PW12O40 is a successful catalyst for such hydrogenation, and Cs2.5H0.5PW12O40 has been shown to be the best of the supports investigated for the preparation of catalysts using the impregnation method. Pd, Au and Au:Pd catalysts supported on TiO2 have been used for the hydrogenation of furfuryl alcohol and furfural with H2 at room temperature. The influence of the pressure, catalyst mass, support, Au:Pd variation, Pd loading and solvent have been investigated. In addition, Ru and Ru:Pd was studied with furfural, and also the effect of Ru:Pd ratios. The selective hydrogenation of both Furfuryl alcohol and Furfural into 2-methylfuran was investigated at room temperature using Palladium supported catalysts. This study has shown that Pd/TiO2 catalysts can be very effective for the synthesis of 2-methylfuran at room temperature and low pressure hydrogen (1-3 bar). The effect of various reaction conditions (pressure, catalyst amount, and solvent) has been studied. Controlling the catalyst composition can control the selectivity to molecules with multiple functioning groups, and reaction conditions can promote or hinder the various reaction pathways, thus increasing selectivity to the desired hydrogenation yields.
The present study investigates a process for the selective production of hydrogen from the cataly... more The present study investigates a process for the selective production of hydrogen from the catalytic decomposition of formic acid in the presence of iridium and iridium–palladium nanoparticles under various conditions. It was found that a loading of 1 wt.% of 2% palladium in the presence of 1% iridium over activated charcoal led to a 43% conversion of formic acid to hydrogen at room temperature after 4 h. Increasing the temperature to 60 °C led to further decomposition and an improvement in conversion yield to 63%. Dilution of formic acid from 0.5 to 0.2 M improved the decomposition, reaching conversion to 81%. The reported process could potentially be used in commercial applications.
Journal of Inorganic and Organometallic Polymers and Materials, 2022
Herein, we report a strategy to synthesize zinc oxide nanoparticles (ZnO NPs) from Clitoria terna... more Herein, we report a strategy to synthesize zinc oxide nanoparticles (ZnO NPs) from Clitoria ternatea flower extract through green synthesis platform. The bioactive components in the C. ternatea flower extract acts as a stabilizing and capping agent, which enables the synthesis of ZnO NPs without the use of chemical reagents. Synthesis of of ZnO NPs through green platform was confirmed by analytical characterization techniques such as UV–Vis spectrophotometry, XRD, FTIR, DLS, Zeta potential, TEM, and EDX methods. The surface morphology and average size of ZnO NPs investigated through TEM and DLS results indicates rod shaped structure with average particle size of 84 nm. Green synthesized ZnO NPs shows excellent antibacterial, antibiofilm, and antioxidant activity which is dose-dependent. These ZnO NPs have cytotoxicity against breast cancer cells (MCF-7). The MTT test revealed a concentration-dependent inhibitory effect on MCF-7 cells, with IC50 being 12.1 g/ml, and their anticancer potential was detected utilizing live and dead cell assays LDH release, Ao/EtBr), DAPI, ROS, and caspase-3 activation assays. Finally, the findings of these results shows that ZnO NPs derived from C. ternatea flower extract are highly potential candidates to treat bacterial infection and human breast cancer.
Despite a number of reports on synthetic methods for 1,1'- binaphthyl molecules with a substi... more Despite a number of reports on synthetic methods for 1,1'- binaphthyl molecules with a substitution in certain positions, to the best of our knowledge neither the synthesis of binaphthyl-based chiral dendrimers by 1,3-cycloaddition reactions, "Click" chemistry, or attempts to achieve the substitution in multiple potential positions on binaphthyl cores has been studied yet. Previously reported optically active binaphthyl-based dendrimers have shown application in a number of applications, such as in asymmetric catalysts, enantioselective fluorescent sensors and chiral molecular recognition. Therefore, this project will focus on the synthesis of some novel chiral multiply functionalized 1,1'-binaphthyl molecules, including those that contain suitable groups to enable "Click" reactions and to facilitate the synthesis of some symmetric and asymmetric chiral dendrimers.
Abstract Using gold and palladium supported catalysts, the selective hydrogenation of furfuryl al... more Abstract Using gold and palladium supported catalysts, the selective hydrogenation of furfuryl alcohol into 2-methylfuran at 25 °C was examined. The use of 2-methylfuran has become applicable in the perfumery and personalised care product industry, and it has been shown that there are two conditions under which Au:Pd/SiO2 catalysts are successful for selectivity to 2-methylfuran at 25 °C and (1 bar, H2). Moreover, this study has shed light on the effectiveness of several reaction conditions (supports and catalyst amount).
The selective hydrogenation of furfural at ambient temperature has been investigated using a Pd/T... more The selective hydrogenation of furfural at ambient temperature has been investigated using a Pd/TiO2 catalyst.
The selective hydrogenation of furfuryl alcohol into 2-methylfuran was investigated at room tempe... more The selective hydrogenation of furfuryl alcohol into 2-methylfuran was investigated at room temperature using palladium supported catalysts.
Hydrogenation is one of the major processes used in commercial and academic applications in the m... more Hydrogenation is one of the major processes used in commercial and academic applications in the manufacture of chemical intermediates; high tonnage products of high value, and useful chemicals, such as agrochemicals and pharmaceuticals. Free solvent hydrogenation of cyclohexanol using Au, Au:Pd and Pd/CsxH0.5PW12O40 catalysts have been performed in the liquid phase. Reaction conditions, for example supports with/without Cs-salt loading, metal loading and/or ratio were varied to achieve ideal conditions. The Palladium supported on Cs2.5H0.5PW12O40 is a successful catalyst for such hydrogenation, and Cs2.5H0.5PW12O40 has been shown to be the best of the supports investigated for the preparation of catalysts using the impregnation method. Pd, Au and Au:Pd catalysts supported on TiO2 have been used for the hydrogenation of furfuryl alcohol and furfural with H2 at room temperature. The influence of the pressure, catalyst mass, support, Au:Pd variation, Pd loading and solvent have been investigated. In addition, Ru and Ru:Pd was studied with furfural, and also the effect of Ru:Pd ratios. The selective hydrogenation of both Furfuryl alcohol and Furfural into 2-methylfuran was investigated at room temperature using Palladium supported catalysts. This study has shown that Pd/TiO2 catalysts can be very effective for the synthesis of 2-methylfuran at room temperature and low pressure hydrogen (1-3 bar). The effect of various reaction conditions (pressure, catalyst amount, and solvent) has been studied. Controlling the catalyst composition can control the selectivity to molecules with multiple functioning groups, and reaction conditions can promote or hinder the various reaction pathways, thus increasing selectivity to the desired hydrogenation yields.
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Papers by Obaid Aldosari