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Gold nanocatalysts supported on Mono-/Mixed oxides for efficient synthesis of methyl methacrylate.

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Title: Gold nanocatalysts supported on Mono-/Mixed oxides for efficient synthesis of methyl methacrylate.
Authors: Farooq, Muhammad Umar1,2 (AUTHOR) umar@sjtu.edu.cn, Zairov, Rustem R.2,3 (AUTHOR), Arkook, Bassim4 (AUTHOR), Harb, Moussab4 (AUTHOR), Makhlouf, Mohamed M1,5 (AUTHOR) m.makhlouf@tu.edu.sa
Source: Fuel (0016-2361). Feb2025:Part A, Vol. 382, pN.PAG-N.PAG. 1p.
Subjects: Aluminum oxide, Clean energy, Sustainability, Gold nanoparticles, Combustion efficiency, Cerium oxides
Abstract: [Display omitted] • Both mono and mixed support effects of gold nanocatalysts are explored for MAL conversion. • Choice of oxide support plays beneficial role in determining the catalytic activity of gold nanocatalysts. • Mixed oxides provide a stable and well-defined surface for anchoring gold nanocatalysts. • A kinetics strategy to overcome thermodynamic constraints the formation of unwanted by-products is presented. Developing sustainable methods for producing methyl methacrylate (MMA) has gained strategic importance for industrial applications and as a promising oxygenated fuel additive to enhance combustion efficiency and reduce emissions. This dual-purpose approach addresses both industrial needs and the growing demand for cleaner fuel solutions. Our study focuses on synthesizing gold nanoparticles (AuNPs) supported by alumina (Al 2 O 3), cerium oxide (CeO 2), and Al 2 O 3 /CeO 2 combination by deposition–-precipitation method, aiming to advance far-reaching MMA synthesis through direct oxidative esterification (DOE) of methacrolein (MAL) with methanol. The research explores the relationship between catalyst structure and activity, particularly investigating the impact of AuNPs doping on Al 2 O 3 , CeO 2 , and Al 2 O 3 /CeO 2 and the mechanism that promotes selective oxidation. The intimate interaction between CeO 2 and Al 2 O 3 and adequate doping of AuNPs with Al 2 O 3 /CeO 2 is beneficial in enhancing catalytic activity and facilitating selective oxidation. Notably, Au/Al 2 O 3 /CeO 2 demonstrated significantly higher catalytic activity compared to Au/Al 2 O 3 and Au/CeO 2 catalysts, achieving 98% MAL conversion and 95% MMA selectivity. The reaction yield, in particular, strongly correlated with surface and active oxygen species around AuNPs. This highly efficient catalytic process provides a green route for MMA production and enables its application as a sustainable fuel additive, contributing to improved engine performance and reduced environmental impact. The optimized catalyst system presents a viable pathway for both industrial chemical production and sustainable energy applications, addressing crucial environmental and energy challenges simultaneously. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • Both mono and mixed support effects of gold nanocatalysts are explored for MAL conversion. • Choice of oxide support plays beneficial role in determining the catalytic activity of gold nanocatalysts. • Mixed oxides provide a stable and well-defined surface for anchoring gold nanocatalysts. • A kinetics strategy to overcome thermodynamic constraints the formation of unwanted by-products is presented. Developing sustainable methods for producing methyl methacrylate (MMA) has gained strategic importance for industrial applications and as a promising oxygenated fuel additive to enhance combustion efficiency and reduce emissions. This dual-purpose approach addresses both industrial needs and the growing demand for cleaner fuel solutions. Our study focuses on synthesizing gold nanoparticles (AuNPs) supported by alumina (Al 2 O 3), cerium oxide (CeO 2), and Al 2 O 3 /CeO 2 combination by deposition–-precipitation method, aiming to advance far-reaching MMA synthesis through direct oxidative esterification (DOE) of methacrolein (MAL) with methanol. The research explores the relationship between catalyst structure and activity, particularly investigating the impact of AuNPs doping on Al 2 O 3 , CeO 2 , and Al 2 O 3 /CeO 2 and the mechanism that promotes selective oxidation. The intimate interaction between CeO 2 and Al 2 O 3 and adequate doping of AuNPs with Al 2 O 3 /CeO 2 is beneficial in enhancing catalytic activity and facilitating selective oxidation. Notably, Au/Al 2 O 3 /CeO 2 demonstrated significantly higher catalytic activity compared to Au/Al 2 O 3 and Au/CeO 2 catalysts, achieving 98% MAL conversion and 95% MMA selectivity. The reaction yield, in particular, strongly correlated with surface and active oxygen species around AuNPs. This highly efficient catalytic process provides a green route for MMA production and enables its application as a sustainable fuel additive, contributing to improved engine performance and reduced environmental impact. The optimized catalyst system presents a viable pathway for both industrial chemical production and sustainable energy applications, addressing crucial environmental and energy challenges simultaneously. [ABSTRACT FROM AUTHOR]
ISSN:00162361
DOI:10.1016/j.fuel.2024.133763