Synthesis of bimetallic gold-pallidum loaded on carbon as efficient catalysts for the oxidation of benzyl alcohol into benzaldehyde

Tareq, Sanaa; Taufiq-Yap, Yun Hin; Saleh, Tawfik A.; Abdullah, Abdul Halim; Rashid, Umer; Saiman, Mohd Izham

doi:10.1016/j.molliq.2018.09.037

Cited by 60 publications

(12 citation statements)

References 32 publications

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“…In recent years, the heterogeneous bimetallic catalysts containing Au and Pd nanoparticles as the active sites were synthesized and successfuly used for catalytic oxidation of BzOH [1a,7–8,14–16] . The comparison of kinetic parameters of BzOH oxidation with PdAu@APTES@SiO 2 microspheres with the similar studies are given in Table 3.…”

Section: Resultsmentioning

confidence: 95%

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Bimetallic Pd‐Au Nanoparticles Supported Monodisperse Porous Silica Microspheres as an Efficient Heterogenous Catalyst for Fast Oxidation of Benzyl Alcohol

2022

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A bimetallic heterogeneous catalyst in the form of PdAu nanoparticle supported monodisperse‐porous SiO2 microspheres (PdAu@APTES@SiO2) was prepared for fast oxidation of benzyl alcohol (BzOH). The mesoporous support obtained by an originally developed staged‐shape templated hydrolysis‐condensation protocol provided large surface area and high pore volume for parking of noble metal nanoparticles. PdAu@APTES@SiO2 provided higher BzOH conversion, benzaldehyde (BzH) selectivity and BzH formation yield with respect to monometallic catalysts containing Pd or Au nanoparticles supported with SiO2 microspheres. BzOH conversions and BzH formation yields higher than 95 % were obtained in 30 min at 80 °C. The maximum TON and TOF values were determined as 300 and 600 h−1, respectively. BzOH conversions and TOF were also higher with respect to similar catalysts prepared using different supports also carrying PdAu nanoparticles. PdAu@APTES@SiO2 exhibited good stability with a decrease of BzOH conversion less than 2.5 % over five consecutive runs.

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Section: Resultsmentioning

confidence: 95%

“…They obtained the highest BzH selectivity (88 %) from the bimetallic catalyst prepared by the sol immobilization method. [15] Olmos et. al adjusted the size of AuPd catalyst supported on ceriazirconia oxide with oxidation temperature.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Pd‐Au Nanoparticles Supported Monodisperse Porous Silica Microspheres as an Efficient Heterogenous Catalyst for Fast Oxidation of Benzyl Alcohol

2022

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“…Gold and platinum were loaded on titania, using two techniques; impregnation and immobilization (28).…”

Section: Synthesis Of the Catalystsmentioning

confidence: 99%

Synthesis of Bimetallic Au–Pt / TiO2 Catalysts as an Efficient Catalyst for the Photodegradation of Crystal Violet Dye

et al. 2021

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Bimetallic Au –Pt catalysts supporting TiO2 were synthesised using two methods; sol immobilization and impregnation methods. The prepared catalyst underwent a thermal treatment process at 400◦ C, while the reduction reaction under the same condition was done and the obtained catalysts were identified with transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). It has been found that the prepared catalysts have a dimension around 2.5 nm and the particles have uniform orders leading to high dispersion of platinum molecules .The prepared catalysts have been examined as efficient photocatalysts to degrade the Crystal violet dye under UV-light. The optimum values of Bimetallic Au –Pt catalysts supporting TiO2 have been found (0.05g of the catalyst prepared in sol immobilization method, 0.07 g of the synthesised in impregnation procedure. The impact of pH on the degradation reaction was tested; it has been found that pH 10 is the best media for the reaction. The effect of temperature has been discussed when various temperatures were used, and the heat of photoreaction Ea was estimated from the Arrhenius relationship, it has been concluded that the reaction is independent of temperature as the activation energy was very small (Ea= 22 kJ/ mole). The thermodynamic functions; entropy, enthalpy and the free energy have been figured out. It has been found that the positive values of enthalpy ∆H# refer to endothermic reaction, moreover, it has been demonstrated that the photoreaction is an endergonic one according to the calculated values of the free energy of activation. It has been noticed that when temperature increases, it promotes the production of free radicals, but it has been noticed that exceeding the temperature more than the used range causes reducing the percentage of degradation of crystal violet, the reason is due to the limitation conditions of adsorption process at higher temperature on the surface of the catalyst.

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“…Transition metals have received considerable attention in photocatalysis due to their physicochemical properties [15,29,30]. As a result, doping TiO 2 with transition metal is an effective and commonly used method for extending light response and preventing recombination of photo-generated electron-hole pairs, resulting in outstanding photocatalytic performance [31].…”

Section: Introductionmentioning

confidence: 99%

Efficient degradation of doxycycline and ofloxacin in an aqueous environment using Fe and Cu doped TiO2-SiO2 photocatalyst under sunlight

Rani

Garg

Singh

2021

Environmental Engineering Research

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Several drugs have sparked interest as potential COVID-19 treatment options. Doxycycline (DOX) has been widely used with other potential agents to reduce COVID-19-induced inflammation. DOX and OFLX, both well-known antimicrobial and anti-inflammatory drugs, were chosen as model pollutants. Fe, Cu-codoped TiO2-SiO2 was synthesised as a novel photocatalyst active under sunlight irradiation to treat model pollutants. The synthesised catalyst samples were meticulously characterised using various techniques to evaluate their morphological, optical, and structural properties. The results of BET analysis showed that the TSFC1 sample has a large specific surface area of 288 m 2 g -1 . Maximum degradation of DOX and OFLX (about 98%) was achieved with the TSFC1 catalyst. The photocatalytic reusability was investigated for up to seven successive cycles, and the composite particles maintained their high photodegradation activity for DOX and OFLX. TFSC1 composite, in particular, demonstrated high catalytic activity as well as excellent recovery potential, and its combination with solar light, silica, and dopants can be introduced as a promising strategy for efficiently destroying both DOX and OFLX antibiotics. This study highlights the feasibility of hybridising doped dual semiconductor nanostructures in implementing solar light-powered pharmaceutical wastewater degradation.

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Synthesis of bimetallic gold-pallidum loaded on carbon as efficient catalysts for the oxidation of benzyl alcohol into benzaldehyde

Cited by 60 publications

References 32 publications

Bimetallic Pd‐Au Nanoparticles Supported Monodisperse Porous Silica Microspheres as an Efficient Heterogenous Catalyst for Fast Oxidation of Benzyl Alcohol

Bimetallic Pd‐Au Nanoparticles Supported Monodisperse Porous Silica Microspheres as an Efficient Heterogenous Catalyst for Fast Oxidation of Benzyl Alcohol

Synthesis of Bimetallic Au–Pt / TiO2 Catalysts as an Efficient Catalyst for the Photodegradation of Crystal Violet Dye

Efficient degradation of doxycycline and ofloxacin in an aqueous environment using Fe and Cu doped TiO2-SiO2 photocatalyst under sunlight

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