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

Chemical Reviews, Год журнала: 2018, Номер 118(10), С. 4981 - 5079

Опубликована: Апрель 16, 2018

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

Язык: Английский

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Small-Pore Zeolites: Synthesis and Catalysis

Chemical Reviews, Год журнала: 2018, Номер 118(11), С. 5265 - 5329

Опубликована: Май 10, 2018

In the past decade or so, small-pore zeolites have received greater attention than large- and medium-pore molecular sieves that historically dominated literature. This is primarily due to commercialization of two major catalytic processes, NOx exhaust removal methanol conversion light olefins, take advantage properties these materials with smaller apertures. Small-pore possess pores are constructed eight tetrahedral atoms (Si4+ Al3+), each time linked by a shared oxygen These eight-member ring (8MR) provide small molecules access intracrystalline void space, e.g., during car cleaning (NOx removal) en route its into while restricting larger molecule entrance departure critical overall catalyst performance. total, there forty-four structurally different zeolites. Forty-one can be synthesized, first synthetic zeolite (KFI, 1948) was in fact material. Although field 8MR chemistry has expanded many directions, progress synthesis framework-specific, leaving insights generalizations difficult realize. review focuses on relevant details all provides some generalized findings related insights. Next, applications where either been commercialized investigations presented, aim providing structure-activity relationships. The ends summary discusses (i) both progress, (ii) list opportunities field, (iii) brief future outlook.

Язык: Английский

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The Direct Catalytic Oxidation of Methane to Methanol—A Critical Assessment

Angewandte Chemie International Edition, Год журнала: 2017, Номер 56(52), С. 16464 - 16483

Опубликована: Июнь 23, 2017

Despite the large number of disparate approaches for direct selective partial oxidation methane, none them has translated into an industrial process. The methane to methanol is a difficult, but intriguing and rewarding, task as it potential eliminate prevalent natural gas flaring by providing novel routes its valorization. This Review considers synthesis derivatives from homogeneous heterogeneous pathways. By establishing severe limitations related catalytic we highlight vastly superior performance systems which produce or incorporate specific measures, such use multicomponent catalysts stabilize methanol. We thereby identify protection being indispensable future research on catalysis.

Язык: Английский

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Mild oxidation of methane to methanol or acetic acid on supported isolated rhodium catalysts

Nature, Год журнала: 2017, Номер 551(7682), С. 605 - 608

Опубликована: Ноя. 1, 2017

Язык: Английский

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Co-electrolysis of CO2 and glycerol as a pathway to carbon chemicals with improved technoeconomics due to low electricity consumption

Nature Energy, Год журнала: 2019, Номер 4(6), С. 466 - 474

Опубликована: Апрель 22, 2019

Язык: Английский

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Direct Methane Conversion under Mild Condition by Thermo-, Electro-, or Photocatalysis

Chem, Год журнала: 2019, Номер 5(9), С. 2296 - 2325

Опубликована: Май 27, 2019

Язык: Английский

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Chemical looping beyond combustion – a perspective

Energy & Environmental Science, Год журнала: 2020, Номер 13(3), С. 772 - 804

Опубликована: Янв. 1, 2020

Facilitated by redox catalysts capable of catalytic reactions and reactive separation, chemical looping offers exciting opportunities for intensified production.

Язык: Английский

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Room-Temperature Methane Conversion by Graphene-Confined Single Iron Atoms

Chem, Год журнала: 2018, Номер 4(8), С. 1902 - 1910

Опубликована: Июнь 19, 2018

Язык: Английский

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New trends in tailoring active sites in zeolite-based catalysts

Chemical Society Reviews, Год журнала: 2019, Номер 48(4), С. 1095 - 1149

Опубликована: Янв. 1, 2019

This review discusses approaches for tailoring active sites in extra-large pore, nanocrystalline, and hierarchical zeolites their performance emerging catalytic applications.

Язык: Английский

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Direct Conversion of Methane to Methanol under Mild Conditions over Cu-Zeolites and beyond

Accounts of Chemical Research, Год журнала: 2017, Номер 50(2), С. 418 - 425

Опубликована: Фев. 2, 2017

ConspectusIn the recent years methane has become increasingly abundant. However, transportation costs are high and recovered as side product is often flared rather than valorized. The chemical utilization of highly challenging currently mainly based on cost-intensive production synthesis gas its conversion. Alternative routes have been discovered in academia, though temperatures mostly required. direct conversion to methanol an exception. It can already be carried out at comparably low temperatures. that more prone oxidation methane, which makes selectivities moderate conversions difficult reach. Decades research for reaction oxygen did not yield a satisfactory solution partial toward methanol. When changing oxidant from hydrogen peroxide, reached conversions, but cost peroxide high. major advancements field were introduced by converting stable precursor. Most notable methyl bisulfate presence platinum catalyst. 102% sulfuric acid using SO3 oxidant. This allows catalyst prevents situ hydrolysis less With slightly different motif, stepped over copper-zeolites was developed decade ago. copper-zeolite first activated 450 °C, then cooled 200 °C reacts with absence oxygen, thus protecting precursor overoxidation. Subsequently extracted water. Several active found, sites identified discussed. For long time, process almost unchanged. Lately, we implemented online steam extraction off-line liquid water, enables execution successive cycles. While recently reported isothermal employing higher pressures, carrying according prior art only yielded neglectable amounts methane. Using pressure <40 bar gave yields under conditions most reports. yield, both after temperature activation increased monotonously pressure. this account show trend represented Langmuir model. Thus, dependence governed adsorption. We processes properties should treated independently, experimental mechanistic point view.

Язык: Английский

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