Scott Gamble

Bio: Scott Gamble is an academic researcher. The author has contributed to research in topics: Catalysis & Methane. The author has an hindex of 3, co-authored 5 publications receiving 1131 citations.

Platinum Catalysts for the High-Yield Oxidation of Methane to a Methanol Derivative

Abstract: Platinum catalysts are reported for the direct, low-temperature, oxidative conversion of methane to a methanol derivative at greater than 70 percent one-pass yield based on methane. The catalysts are platinum complexes derived from the bidiazine ligand family that are stable, active, and selective for the oxidation of a carbon-hydrogen bond of methane to produce methyl esters. Mechanistic studies show that platinum(II) is the most active oxidation state of platinum for reaction with methane, and are consistent with reaction proceeding through carbon-hydrogen bond activation of methane to generate a platinum-methyl intermediate that is oxidized to generate the methyl ester product.

Platinum Catalysts for the High-Yield Oxidation of Methane to a Methanol Derivative

Abstract: Platinum catalysts are reported for the direct, low-temperature, oxidative conversion of methane to a methanol derivative at greater than 70 percent one-pass yield based on methane. The catalysts are platinum complexes derived from the bidiazine ligand family that are stable, active, and selective for the oxidation of a carbon-hydrogen bond of methane to produce methyl esters. Mechanistic studies show that platinum(II) is the most active oxidation state of platinum for reaction with methane, and are consistent with reaction proceeding through carbon-hydrogen bond activation of methane to generate a platinum-methyl intermediate that is oxidized to generate the methyl ester product.

Ligated platinum group metal catalyst complex and improved process for catalytically converting alkanes to esters and derivatives thereof

Abstract: This invention is an improved process for the selective oxidation of lower alkane starting materials (such as methane) into esters and, optionally, into various derivatives (such as methanol) in oxidizing acidic media using a stable platinum group metal ligand catalyst complex at elevated temperatures and refers to a class of novel platinum group metal ligand complexes employed bidiazine ligands, which are sufficiently stable in the oxidizing acidic media at elevated temperatures to be effective catalysts in the alkane conversion reaction.

High Yield, Low Temperature Oxidation of Methane to Methanol

Abstract: Developing methods for the direct oxidation of alkanes to fuel and chemicals will lead to a paradigm shift in the manufacture of chemicals and fuels in the 21st century. We wish to report the development of novel catalysts that allow the direct, low temperature, oxidative conversion of methane to a methanol equivalent product in 70% one-pass yield. To our knowledge, this is the highest one-pass yield ever reported for methane oxidation to a methyl product. The keys to achieving this high yield are: A) the development of novel catalysts that are stable and active for the oxidation of the CH bonds of methane at temperatures as low as 100°C and B) the chemical “protection” of the methanol product from over-oxidation by esterification. The catalysts utilized are novel ligated Pt complexes based on the bidiazine ligand family. A particularly effective oxidation system is based on 20mM solutions of (bipyrimidine)PtC12 in concentrated sulfuric acid. Reaction of methane at 500 psig at 250°C with this solution results in 90% conversion of methane to methyl bisulfate in 80% selectivity (70% one-pass yield) based on added methane.

Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles.

Abstract: Metal species with different size (single atoms, nanoclusters, and nanoparticles) show different catalytic behavior for various heterogeneous catalytic reactions. It has been shown in the literature that many factors including the particle size, shape, chemical composition, metal–support interaction, and metal–reactant/solvent interaction can have significant influences on the catalytic properties of metal catalysts. The recent developments of well-controlled synthesis methodologies and advanced characterization tools allow one to correlate the relationships at the molecular level. In this Review, the electronic and geometric structures of single atoms, nanoclusters, and nanoparticles will be discussed. Furthermore, we will summarize the catalytic applications of single atoms, nanoclusters, and nanoparticles for different types of reactions, including CO oxidation, selective oxidation, selective hydrogenation, organic reactions, electrocatalytic, and photocatalytic reactions. We will compare the results o...

Understanding and exploiting C–H bond activation

Abstract: The selective transformation of ubiquitous but inert C–H bonds to other functional groups has far-reaching practical implications, ranging from more efficient strategies for fine chemical synthesis to the replacement of current petrochemical feedstocks by less expensive and more readily available alkanes. The past twenty years have seen many examples of C–H bond activation at transition-metal centres, often under remarkably mild conditions and with high selectivity. Although profitable practical applications have not yet been developed, our understanding of how these organometallic reactions occur, and what their inherent advantages and limitations for practical alkane conversion are, has progressed considerably. In fact, the recent development of promising catalytic systems highlights the potential of organometallic chemistry for useful C–H bond activation strategies that will ultimately allow us to exploit Earth's alkane resources more efficiently and cleanly.

Highly Regioselective Arylation of sp3 C−H Bonds Catalyzed by Palladium Acetate

Abstract: A new palladium-catalyzed arylation process based on C−H activation has been developed. The utilization of pyridine-containing directing groups allows the β-arylation of carboxylic acid derivatives and γ-arylation of amine derivatives. Both primary and secondary sp3 C−H bonds, as well as sp2 C−H bonds, are reactive.