Microporous and Mesoporous Materials 

About: Microporous and Mesoporous Materials is an academic journal published by Elsevier BV. The journal publishes majorly in the area(s): Mesoporous material & Adsorption. It has an ISSN identifier of 1387-1811. Over the lifetime, 11666 publications have been published receiving 408451 citations.

Metal-organic frameworks: a new class of porous materials

Abstract: A review of the synthesis, structure, andproperties of metal–organic frameworks (MOFs) is presented , highlighting the important advances in their research over the past decade. This new class of porous materials is attracting attention due to demonstrations of their large pore sizes, high apparent surface areas, selective uptake of small molecules, andoptical or magnetic responses to the inclusion of guests. More importantly, their synthesis from molecular building blocks holds the potential for directed tailoring of these properties.

Ordered mesoporous materials in catalysis

Abstract: Ordered mesoporous catalysts could open the door for new catalytic processes, based partly on novel principles, owing to their hitherto unprecedented intrinsic features. For the preparation of ordered mesoporous catalysts, many strategies have been described. These strategies and the essential properties of the resulting materials are described in the first part of this review. Catalytic processes over such mesoporous materials, especially such reactions where the specific features of ordered mesoporous catalysts are exploited, are described in the second part.

Pore size determination in modified micro- and mesoporous materials. Pitfalls and limitations in gas adsorption data analysis

Abstract: Physical gas adsorption is extensively used in the characterization of micro- and mesoporous materials and is often considered as a straightforward-to-interpret technique. However, physical phenomena like the tensile strength effect, adsorbate phase transitions, and monolayer formation in combined micro- and mesoporous materials frequently lead to extra contributions in the adsorption isotherm. Models for pore size determination mostly do not account for this, and assignment to real pores leads to improper analysis of adsorption data. In this review, common pitfalls and limitations in the analysis of pore size distributions derived from adsorption isotherms of micro- and mesoporous materials are identified and discussed based on new results and examples reported in the recent literature.

Methanol-to-hydrocarbons: catalytic materials and their behavior

Abstract: The literature related to methanol-to-hydrocarbons (MTHC) technology over the past two decades has been reviewed, covering mainly the methanol-to-olefin (MTO) and methanol-to-gasoline (MTG) reactions. The work before around 1990 is briefly addressed, and the interested reader's attention is drawn to review papers published during the late 1980s summarizing the early work related to the methanol-to-hydrocarbons technology. This review focuses mainly on the chemistry and mechanism of those reactions including the catalysts involved and their behavior due to crystal size, pore architecture, acidity and reaction conditions, covering the time since around 1990. In a second review authored by F. Keil, the process related items of methanol-to-hydrocarbons technology will be summarized and discussed in the light of kinetic and reaction technology aspects.

The hydrothermal synthesis of zeolites: precursors, intermediates and reaction mechanism

Abstract: An account is presented of the mechanistic aspects of hydrothermal zeolite synthesis. The introduction provides a historical and experimental perspective and is followed by a summary of proposed mechanisms and associated modelling studies. The central section of the review contains a description of the most probable mechanistic pathways in zeolite formation. In this, the reaction stages of the induction period, nucleation and crystal growth are examined in chronological sequence. Finally, particular aspects of the synthesis process such as the constitution of growth species, template–framework interactions and the nature of zeolite solubility are treated in more detail. Emphasis is placed upon the chemical basis of zeolite synthesis. Fundamental to this are the T O T bond-making and bond-breaking reactions which establish the equilibration between solid and solution components. The consequent generation of order, driven by energy differences and strongly moderated by kinetic limitations, is essentially one of continuous evolution. However, the discreet step of nucleation provides a discontinuity in which isolated regions of local order are superceded by the establishment of a periodic crystal lattice, capable of propagation. Crystal growth occurs through an in-situ, localised construction process from small, mobile species ordered by the participating cations. The process of hydrothermal zeolite synthesis can be most adequately explained by a mechanism based upon the solution–mediation model, whether or not there is a visible liquid phase. The common presence of mobile species emphasises the overall similarity of zeolite synthesis reactions so that the need to distinguish any separate “gel rearrangement” or “solid-phase transformation” mechanism becomes unnecessary.