Abstract
Abstract The aim of this general review is to give an overview of the reaction pathways involving the transformation of carbon monoxide (CO), methanol synthesis and propylene epoxidation using gold (Au) and gold supported clusters. Over the catalyst system of Nano-gold (Au/SiO2), the process of methane to methanol was also highlighted. A reaction mechanism proposed, indicated that molecular oxygen was consumed in the oxidation–reduction cycle. Consequently, methane oxidation to methanol can be achieved as a green chemical process. The system can also be used in other green chemical processes of liquid phase or gas phase oxidations. Methanol is expected to be a potential solution to the partial deployment of fossil source-based economies. Moreover, it is a recognized energy carrier that is better than other alternatives in terms of transportation, storage and reuse. New or improved catalysts for methanol production are likely to be discovered in the near future.
Highlights
For some time, Gold (Au) was regarded as a poorly active catalyst
Activities of catalysts having a high degree of support Au catalysts for carbon monoxide (CO) oxidation under room temperature arises from reaction of CO absorbed on the step, the extreme which is the edge, and the corner of nanoparticles of Au catalyst on oxide support where molecules of oxygen are adsorbed at it circumference area
It is unlikely that oxide Au species and non-metallic small Au clusters are brain behind the extraordinarily high catalytic activity, they are active to a certain extent
Summary
Gold (Au) was regarded as a poorly active catalyst. Theoretical findings newly describe reason. The report from this work shows that, SiO2 support (being a reducible oxides) is highly stable with very limited formation of carbonaceous deposit, despite it lower activity when compared with a reducible TiO2 (being a reducible oxide) which exhibit low stability. A recent work in 2018 reported by Ziyauddin S. et al on Silica-Supported Au Nano catalyst for CO Oxidation, expressed that the catalytic activity of Au NPs supported on reducible metal oxides such TiO2, CeO2, Fe2O3, Co3O3 is very high compared to the activity of SiO2 being a non-reducible oxide, but silica is an inert, inexpensive, and convenient support that can be shaped into a lot of attractive and varied morphologies. The report on this work shows that SEA and CEDI opens a new and a promising approach for support metal catalyst preparation [28]
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