Author
Sergey Beloshapkin
Bio: Sergey Beloshapkin is an academic researcher from University of Limerick. The author has contributed to research in topics: Catalysis & Formic acid. The author has an hindex of 22, co-authored 41 publications receiving 1503 citations.
Topics: Catalysis, Formic acid, Hydrogen production, Hydrogen, Redox
Papers
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Abstract: Single-site heterogeneous catalysis with isolated Pd atoms was reported earlier, mainly for oxidation reactions and for Pd catalysts supported on oxide surfaces. In the present work, we show that single Pd atoms on nitrogen-functionalized mesoporous carbon, observed by aberration-corrected scanning transmission electron microscopy (ac STEM), contribute significantly to the catalytic activity for hydrogen production from vapor-phase formic acid decomposition, providing an increase by 2–3 times in comparison to Pd catalysts supported on nitrogen-free carbon or unsupported Pd powder. Some gain in selectivity was also achieved. According to X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) studies after ex situ reduction in hydrogen at 573 K, these species exist in a Pd2+ state coordinated by nitrogen species of the support. Extended density functional theory (DFT) calculations confirm that an isolated Pd atom can be the active site for the reaction, giving decompos...
222 citations
TL;DR: In this article, the mean metal particle size of these materials was estimated by HRTEM and turnover frequencies were calculated using these data, and the selectivity of these catalysts was found to be only weakly dependent on the reaction temperature and the formic acid conversion.
208 citations
TL;DR: In this article, the authors compared the performance of N-doped and undoped Pt catalysts on carbon nanofibers with different nitrogen contents for hydrogen production by formic acid decomposition.
125 citations
TL;DR: In this paper, a detailed mechanism for the oxidation of methanol on vanadia catalysts is discussed, which involves a reversible reduction of V 5+ cations, indicating that vanadia lattice oxygen participates in the oxidation via the classical Mars-van Krevelen mechanism.
114 citations
TL;DR: The rate of hydrogen production from vapour-phase formic acid decomposition can be increased by 1-2 orders of magnitude by doping a Pd/C catalyst with potassium ions.
97 citations
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1,414 citations
TL;DR: In this article, the state of research for heterogeneous and homogeneous formic acid dehydrogenation catalysts is reviewed in detail and an outlook on necessary development steps is presented.
Abstract: Formic acid has recently been suggested as a promising hydrogen storage material. The basic concept is briefly discussed and the recent advances in the development of formic acid dehydrogenation catalysts are shown. Both the state of research for heterogeneous and for homogeneous catalyst systems are reviewed in detail and an outlook on necessary development steps is presented. Formic acid is considered as one of the most promising materials for hydrogen storage today. There are a number of highly active and robust homogeneous catalysts that selectively decompose formic acid to H2 and CO2 near to room temperature. Although the activity and selectivity of heterogeneous catalysts have not yet reached the level of homogeneous systems, this gap is closing.
929 citations
711 citations
TL;DR: In this paper, the authors survey the research progress in hydrogen generation from liquid-phase chemical hydrogen storage materials and their regeneration, and present a review of these materials in hydrogen storage.
Abstract: In the search for future energy supplies, the application of hydrogen as an energy carrier is seen as a prospective issue. However, the implementation of a hydrogen economy is suffering from several unsolved problems. Particularly challenging is the storage of appropriate amounts of hydrogen. In this context one of the promising hydrogen storage techniques relies on liquid-phase chemical hydrogen storage materials, in particular, aqueous sodium borohydride, ammonia borane, hydrazine, hydrazine borane and formic acid. The use of these materials in hydrogen storage provides high gravimetric and volumetric hydrogen densities, low potential risk, and low capital investment because it is largely compatible with the current transport infrastructure. In this review, we survey the research progresses in hydrogen generation from these liquid-phase chemical hydrogen storage materials and their regeneration.
709 citations
TL;DR: In this article, the advances achieved during the past few years in the development of catalytic materials for hydrogen generation through fuel reforming, 1 water-gas shift and carbon monoxide preferential oxidation, as used or aimed to be of use in fuel processing for PEM fuel cell systems.
Abstract: The rapid development in recent years of the proton-exchange membrane (PEM) fuel cell technology has stimulated research in all areas of fuel processor catalysts for hydrogen generation. The principal aim is to develop more active catalytic systems that allow for the reduction in size and increase the efficiency of fuel processors. The overall selectivity in generating a low CO content hydrogen stream as needed by the PEM fuel cell catalyst is dependent on the efficiency of the catalysts in each segment of the fuel processor. This article reviews the advances achieved during the past few years in the development of catalytic materials for hydrogen generation through fuel reforming, 1 water-gas shift and carbon monoxide preferential oxidation, as used or aimed to be of use in fuel processing for PEM fuel cell systems.
672 citations