Publication

Selective methylation of catechol: Catalyst development and characterization

Albert Renken, Lioubov Kiwi
1996
Book Chapters

Abstract

A symposium report on the gas-phase methylation of catechol by methanol on g -Al2O3 modified by the basic elements: K, Li, Mg and Ca. Addn. of 7.5 at % Mg to g-Al2O3 was optimal and increased the 3-Me catechol selectivity from 0.26 to 0.65. X-ray diffraction expts. showed the diffusion of Li+ and Mg2+ cations into the g -Al2O3 bulk. This induces a change in the surface species and the surface acid-base properties. Ca2+ and K+ addn. to g-alumina was ineffective due to formation of basic oxide layers on the surface. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/0d2a5f36-f222-4fbe-b1f7-b7565fb4bfe8

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Albert Renken, Lioubov Kiwi
1996
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0d2a5f36-f222-4fbe-b1f7-b7565fb4bfe8

About this result

Related concepts (29)

Aluminium oxide

Aluminium oxide (or Aluminium(III) oxide) is a chemical compound of aluminium and oxygen with the chemical formula . It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium oxide. It is commonly called alumina and may also be called aloxide, aloxite, or alundum in various forms and applications. It occurs naturally in its crystalline polymorphic phase α-Al2O3 as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.

Properties of water

Water () is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, which is nearly colorless apart from an inherent hint of blue. It is by far the most studied chemical compound and is described as the "universal solvent" and the "solvent of life". It is the most abundant substance on the surface of Earth and the only common substance to exist as a solid, liquid, and gas on Earth's surface. It is also the third most abundant molecule in the universe (behind molecular hydrogen and carbon monoxide).

Aluminium hydroxide

Aluminium hydroxide, , is found in nature as the mineral gibbsite (also known as hydrargillite) and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite. Aluminium hydroxide is amphoteric, i.e., it has both basic and acidic properties. Closely related are aluminium oxide hydroxide, AlO(OH), and aluminium oxide or alumina (), the latter of which is also amphoteric. These compounds together are the major components of the aluminium ore bauxite. Aluminium hydroxide also forms a gelatinous precipitate in water.

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Selective methylation of catechol: Catalyst development and characterization

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