A Scientific Description of Pt Adsorption onto Alumina

Regalbuto, John R.; Agashe, Krishna B.; Navada, A.; Bricker, Maureen; Chen, Q.

doi:10.1016/s0167-2991(98)80177-8

Cited by 16 publications

(3 citation statements)

References 19 publications

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“…Oxide surfaces are usually covered with hydroxyl groups, and when the oxides are in an aqueous solution, they become positively charged below the PZC (point of zero charge) of the oxides or negatively charged above the PZC. Under these conditions, the metal ion complexes deposit onto the support surfaces via strong electrostatic adsorption (SEA). − When the metal ion complexes are strongly anchored onto the support surfaces to form a monolayer and the subsequent treatments to remove the undesired ligands do not destabilize the metal atoms, a maximum loading of single metal atoms can be realized. The spatial distribution of functional groups on the supports is, however, usually heterogeneous, and the presence of various types of surface defects significantly influences the adsorption behavior of the metal complexes.…”

Section: Synthesis Of Single-atom Catalystsmentioning

confidence: 99%

Catalysis by Supported Single Metal Atoms

2016

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The recent explosive growth in research on catalysis by supported single metal atoms proves the scientific interest in this new frontier of heterogeneous catalysis. A supported single-atom catalyst (SAC) contains only isolated individual atoms dispersed on, and/or coordinated with, the surface atoms of an appropriate support. SACs not only maximize the atom efficiency of expensive metals but also provide an alternative strategy to tune the activity and selectivity of a catalytic reaction. When single metal atoms are strongly anchored onto high-surface-area supports, SACs offer a great potential to significantly transform the field of heterogeneous catalysis, which has been critical to enabling many important technologies. In this Perspective, I discuss the most recent advances in preparing, characterizing, and catalytically testing SACs with a focus on correlating the structural perspective of the anchored single metal atoms to the observed catalytic performances. The grand challenge to successfully developing practical SACs is to find appropriate approaches to strongly anchor the single metal atoms and to keep them stable and functional during the desired catalytic reactions. I will highlight the recent advances to overcome this barrier to develop SACs for a variety of important catalytic transformations of molecules.

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Section: Synthesis Of Single-atom Catalystsmentioning

confidence: 99%

Catalysis by Supported Single Metal Atoms

2016

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“…Conventional wet synthetic routes , include impregnation, , coprecipitation, − deposition–precipitation, and strong electrostatic adsorption methods. − These approaches are widely used due to their large-scale production and operational simplicity. They are the preferred methods for commercial production of supported metal catalysts.…”

Section: Single-atom Catalystsmentioning

confidence: 99%

Single-Atom Catalysts Designed and Prepared by the Atomic Layer Deposition Technique

Fonseca

2021

ACS Catal.

168

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The atomic layer deposition (ALD) technique allows the synthesis of materials at the atomic scale to be controlled. ALD has been adapted to design and prepare single-atom catalysts (SACs) with atomic-level control. The major aim of this Review is to systematize our knowledge of the synthesis of SACs by ALD and thus help the reader to extract fundamental principles for the further development of this field. Studies of metal dimers prepared by ALD are also explored. In addition, we describe the fundamental mechanism of ALD, discuss the effects of size, shape, and metal–support interactions for catalysts, and summarize the characterization techniques and preparation methods of SACs. At the end of this Review, we present an outlook of the challenges and opportunities of the synthesis of SACs by ALD.

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“…Then, liquid was evaporated at 80 °C and finally the monolith was calcined at 500 °C for 4 h. On the other hand, in the adsorption from solution procedure, the monoliths were immersed in an aqueous solution with the adequate concentration of Pt. The pH of the solution was turned basic (11.9) in order to generate an electrostatic attraction between the alumina surface, positively charged, and the Pt precursor, negatively charged Pt(NH3)4 2+ [53][54][55]. The monoliths were maintained immersed in the solution for 24 h so as to reach the adsorption equilibrium.…”

Section: Preparation Procedures Of Monolithic Nsr Catalystsmentioning

confidence: 99%