Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1986-01-23
1987-06-23
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502328, 502341, B01J 2104, B01J 2302, B01J 2326, B01J 2378
Patent
active
046753079
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL FIELD
This invention relates to an alkali metal-supported substance which particularly is useful as an isomerization reaction catalyst.
BACKGROUND TECHNOLOGY
One known strongly basic catalyst used, for example, in the isomerization of olefins is an alkali metal-supported substance prepared by depositing an alkali metal on a carrier having a high specific surface area such as active alumina (see Japanese Patent Publication No. 24138/1970). This substance has high catalytic activity but is very unstable, and even when meticulous cares are taken in its preparation, storage, operational treatments, etc., it cannot show stable catalytic performance.
DISCLOSURE OF THE INVENTION
It is an object of this invention to provide a novel alkali metal-supported substance by a novel combination of a carrier substance and a substance to be deposited.
Another object of this invention is to provide an active alkali metal-supported substance having high activity as a strongly basic catalyst.
Still another object of this invention is to provide an alkali metal-supported substance which can be prepared with good reproducibility and therefore can exhibit highly active catalytic ability with good reproducibility.
Yet another object of this invention is to provide a stabilized alkali metal-supported substance which is not likely to ignite even on contact with water, compounds containing water, or moist air and is easy to handle.
A further object of this invention is to provide a highly active and strongly basic solid catalyst useful, for example, as an isomerization catalyst for olefins.
Still further object of this invention is to provide a method for isomerizing olefins using the substance of this invention as an isomerization catalyst.
Other objects and advantages of this invention will become apparent from the following description.
According to this invention, these objects and advantages of the invention are achieved by an alkali metal-supported substance comprising a calcination product of a hydrotalcite compound represented by the following formula (I) a number represented by 0<m<5, and an alkali metal supported on the calcination product.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 of the accompanying drawings shows one example of a laboratory-scale device for treating an alkali metal-supported substance.
FIG. 2 shows the relation between the treating time and the oxygen content of a discharged gas when an alkali metal-supported substance is treated with a gas containing molecular oxygen by the device of FIG. 1.
BEST MODE FOR PRACTICING THE INVENTION AND ITS INDUSTRIAL UTILIZABILITY
The hydrotalcite compounds of formula (I) constitute part of hydrotalcite compounds represented by the following formula (II) having a valence of n, n is 1 or 2, and x and m are as defined in formula (I) above. divalent metal such as Mg, Zn, Mn and Ni, R' is a trivalent metal such as Al, Cr or Fe, and A is an inorganic anion such as F.sup.-, Cl.sup.-, Br.sup.-, I.sup.-, CO.sub.3.sup.2-, CrO.sub.4.sup.2-, HPO.sub.4.sup.2-, NO.sub.3.sup.-, SO.sub.4.sup.2- or an organic anion such as an oxalate or salicylate anion. The above hydrotalcite compounds of formula (I) correspond to compounds of formula (II) in which M is Mg, R' is Al, Cr or Fe and A is CO.sub.3.sup.2-.
The hydrotalcite compounds of general formula (I) have a crystal structure in which the structural matrix consists of basic layers formed by the combination of octahedrons having Mg as a central metal ion in a network pattern and since these basic layers are positively charged by partial replacement of Mg therein with the metal R, ion-exchangeable CO.sub.3 anions are present between these basic layers to maintain a neutral charge. Water is also present between these basic layers.
Examples of the hydrotalcite compounds of formula (I) are 0.0.5-0.652H.sub.2 O],
Of the above hydrotalcite compounds, those of formula (I) in which R is Al are especially preferably used. These hydrotalcite compounds are used in the form of a calcination product in the present inven
REFERENCES:
patent: 3577354 (1971-05-01), Kehl
Fujimoto Tadaaki
Saeki Kenji
Taniguchi Katsuo
Mitsui Petrochemical Industries Ltd.
Shine W. J.
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