mixed metal oxide
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Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123061
Author(s):  
Shiwei Ge ◽  
Xiaoqing Liu ◽  
Jun Liu ◽  
Hao Liu ◽  
Haiyan Liu ◽  
...  

Author(s):  
Muhammad Asim Farid ◽  
Sana Ijaz ◽  
Muhammad Naeem Ashiq ◽  
Muhammad Fahad Ehsan ◽  
Fiza Gul ◽  
...  

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 94
Author(s):  
Gajanan Y. Shinde ◽  
Abhishek S. Mote ◽  
Manoj B. Gawande

Constantly increasing hydrocarbon fuel combustion along with high levels of carbon dioxide emissions has given rise to a global energy crisis and environmental alterations. Photocatalysis is an effective technique for addressing this energy and environmental crisis. Clean and renewable solar energy is a very favourable path for photocatalytic CO2 reduction to value-added products to tackle problems of energy and the environment. The synthesis of various products such as CH4, CH3OH, CO, EtOH, etc., has been expanded through the photocatalytic reduction of CO2. Among these products, methanol is one of the most important and highly versatile chemicals widely used in industry and in day-to-day life. This review emphasizes the recent progress of photocatalytic CO2 hydrogenation to CH3OH. In particular, Metal organic frameworks (MOFs), mixed-metal oxide, carbon, TiO2 and plasmonic-based nanomaterials are discussed for the photocatalytic reduction of CO2 to methanol. Finally, a summary and perspectives on this emerging field are provided.


Author(s):  
Mostafa H. Sliem ◽  
Karthik Kannan ◽  
Muni Raj Maurya ◽  
Khouloud Jlassi ◽  
Kishor Kumar Sadasivuni ◽  
...  

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 245
Author(s):  
Nugroho Pranyoto ◽  
Yuni Dewi Susanti ◽  
Immanuel Joseph Ondang ◽  
Artik Elisa Angkawijaya ◽  
Felycia Edi Soetaredjo ◽  
...  

The fast depletion of fossil fuels has attracted researchers worldwide to explore alternative biofuels, such as biodiesel. In general, the production of biodiesel is carried out via transesterification processes of vegetable oil with the presence of a suitable catalyst. A mixed metal oxide has shown to be a very attractive heterogeneous catalyst with a high performance. Most of the mixed metal oxide is made by using the general wetness impregnation method. A simple route to synthesize silane-modified mixed metal oxide (CaO-CuO/C6) catalysts has been successfully developed. A fluorocarbon surfactant and triblock copolymers (EO)106(PO)70(EO)106 were used to prevent the crystal agglomeration of carbonate salts (CaCO3-CuCO3) as the precursor to form CaO-CuO with a definite size and morphology. The materials show high potency as a catalyst in the transesterification process to produce biodiesel. The calcined co-precipitation product has a high crystallinity form, as confirmed by the XRD analysis. The synthesized catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The mechanism of surface modification and the effects of the catalytic activity were also discussed. The biodiesel purity of the final product was analyzed by gas chromatography. The optimum biodiesel yield was 90.17% using the modified mixed metal oxide CaO-CuO/C6.


Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 79
Author(s):  
Ethar Yahya Salih ◽  
Asmiet Ramizy ◽  
Osamah Aldaghri ◽  
Mohd Faizul Mohd Sabri ◽  
Nawal Madkhali ◽  
...  

In this article, an in-depth optical investigation of Zn(Al)O-mixed metal oxide (MMO) film using Zn/Al-layered double hydroxide (LDH) was elucidated through co-precipitation and spin coating techniques. The field emission scanning electron microscopy (FE-SEM) analysis revealed the occurrence of a vertically aligned sheet-like structure with a thickness of 60 nm for pristine LDH, which further reduced to 45 nm after calcination at 300 °C. Additionally, pristine LDH showed multiple optical bandgaps of 5.18, 3.6, and 3.2 eV. Moreover, a good agreement of the obtained optical bandgaps was attained between both utilized methods, ultraviolet-visible light (UV-Vis), and photoluminescence (PL) spectroscopies. The optical bandgap decreased at higher calcination temperatures, which indicates the active role of the applied post-fabrication process on the optical profile of the deposited MMO film/s. The demonstrated transmittance spectra of the deposited MMO films exhibited a transparency between 85% and 95%; this indicates the usefulness and consistency of the proposed film for transparent conductive oxide (TCO) based optoelectronic applications.


Author(s):  
Raissa Antonelli ◽  
Geoffroy Roger Pointer Malpass ◽  
Meuris Gurgel Carlos da Silva ◽  
Melissa Gurgel Adeodato Vieira

Author(s):  
Anna K. Boehm ◽  
Samantha Husmann ◽  
Marie Besch ◽  
Oliver Janka ◽  
Volker Presser ◽  
...  

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7444
Author(s):  
Rangsalid Panyadee ◽  
Aphinan Saengsrichan ◽  
Pattaraporn Posoknistakul ◽  
Navadol Laosiripojana ◽  
Sakhon Ratchahat ◽  
...  

Biomass valorization to building block chemicals in food and pharmaceutical industries has tremendously gained attention. To produce monophenolic compounds from palm empty fruit bunch (EFB), EFB was subjected to alkaline hydrothermal extraction using NaOH or K2CO3 as a promotor. Subsequently, EFB-derived lignin was subjected to an oxidative depolymerization using Cu(II) and Fe(III) mixed metal oxides catalyst supported on γ-Al2O3 or SiO2 as the catalyst in the presence of hydrogen peroxide. The highest percentage of total phenolic compounds of 63.87 wt% was obtained from microwave-induced oxidative degradation of K2CO3 extracted lignin catalyzed by Cu-Fe/SiO2 catalyst. Main products from the aforementioned condition included 27.29 wt% of 2,4-di-tert-butylphenol, 19.21 wt% of syringol, 9.36 wt% of acetosyringone, 3.69 wt% of acetovanillone, 2.16 wt% of syringaldehyde, and 2.16 wt% of vanillin. Although the total phenolic compound from Cu-Fe/Al2O3 catalyst was lower (49.52 wt%) compared with that from Cu-Fe/SiO2 catalyst (63.87 wt%), Cu-Fe/Al2O3 catalyst provided the greater selectivity of main two value-added products, syringol and acetosyrigone, at 54.64% and 23.65%, respectively (78.29% total selectivity of two products) from the NaOH extracted lignin. The findings suggested a promising method for syringol and acetosyringone production from the oxidative heterogeneous lignin depolymerization under low power intensity microwave heating within a short reaction time of 30 min.


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