The catalyst for the dehydrogenation of alkylaromatic hydrocarbons

 

(57) Abstract:

The catalyst for the dehydrogenation of alkylaromatic hydrocarbons, including iron oxide, zirconium dioxide, potassium carbonate, rubidium oxide or cesium oxide, molybdenum oxide, cerium oxide, chromium oxide, lanthanum oxide and/or neodymium oxide, Portland cement, silica and magnesium oxide and/or calcium oxide in the following content, wt.%: the Zirconia 0,5-2,5; potassium carbonate 13,0-25,0; oxide of rubidium or cesium oxide 0,05-5,0; molybdenum oxide 0,5-5,0; cerium oxide 1,0-3,0; Portland 5,0-10,0; chromium oxide 0,5-5,0; oxide of lanthanum and/or neodymium oxide 0,05-1,0; silicon oxide 0,5-5,0; magnesium oxide and/or calcium oxide 0.5 to 10.0; iron oxide rest. A new catalyst has a high activity and selectivity. table 1.

The invention relates to the production of catalysts, namely the production of catalysts for the processes of dehydrogenation of alkylaromatic hydrocarbons.

Known catalyst for the dehydrogenation of alkylaromatic hydrocarbons containing, by weight. Fe2O383; K2CO312; CR2O312; SiO23. [1]

Closest to the present invention is a catalyst for dehydrogenation of ethylbenzene is 0-15 [2]

The disadvantages of these catalysts is their relatively low activity and selectivity.

The aim of the invention is to increase the activity and selectivity of the catalyst.

This is achieved by a catalyst for the dehydrogenation of alkylaromatic hydrocarbons contains iron oxide, potassium carbonate, magnesium oxide and/or calcium oxide, cerium oxide, Portland cement, chromium oxide, zirconium dioxide, silicon oxide, rubidium oxide or cesium oxide, lanthanum oxide and/or neodymium oxide in the following, wt. potassium carbonate 12,0-25,0; magnesium oxide and/or calcium oxide 0.5 to 10.0; molybdenum oxide 0,5-5,0; cerium oxide 1,0-8,0; Portland 5,0-10,0; chromium oxide 0,5-5,0; zirconium dioxide of 0.5 to 2.5; a silicon oxide 0,5-5,0; oxide of rubidium and/or cesium 0,05-5,0; oxide of lanthanum and/or neodymium oxide is 0.01-1.0; iron oxide rest.

The difference of the catalyst from the prototype is more content of chromium oxide, zirconium dioxide, silicon oxide, rubidium oxide and/or oxide and cesium oxide of lanthanum and/or neodymium oxide at the specified content component.

The use of the new catalyst of the inventive combination of components in a number of poses is resistant to high temperatures, which significantly increases its service life compared to known catalysts.

The proposed catalyst is prepared by mixing a predetermined ratio chopped oxides of iron, zirconium, chromium, oxides or easy to decompose to oxides of compounds of molybdenum, cerium, lanthanum and/or neodymium, calcium and/or magnesium. The components are mixed and impregnated with an aqueous solution of alkali promoters of potassium, rubidium or cesium. Silicon compounds are administered together with the alkaline promoters or separately. Preferred as compounds of silicon to use organosilicon compounds (for example, aryl-acetyl, etc.) Portland cement is introduced into the catalyst at the stage of dry mixing the components.

The catalyst mass is stirred for 0.5-2.5 hours until a homogeneous mass is then formed by extrusion into a "worm", dried at 110-150oC and calcined at 550-750oC.

The invention is illustrated by the following examples:

Example 1. The dry ingredients of the catalyst g: iron oxide 123; zirconium dioxide 1,0; molybdenum oxide 3; cerium oxide 16; Portland 10; chromium oxide 1 oxide of lanthanum 2; magnesium oxide 2 is mixed for 1 hour Add 30 ml of an aqueous solution, the content of the mass is stirred for 1.5 h to obtain a homogeneous paste, is then formed by extrusion in the "worm" in diameter 3,0-4,0 mm, dried at 110-750oC and calcined at 500-750oC for 3-4 h

Get the catalyst composition, wt. potassium carbonate 13,0; magnesium oxide 1,0; molybdenum oxide 1,5; cerium oxide 8,0; Portland 5,0; chromium oxide 0,5; zirconium dioxide of 0.5; the silicon oxide 1,5; rubidium carbonate 1,5; oxide of lanthanum 1,0; iron oxide 61,5.

The catalyst test is carried out in a reaction dehydrogenation of ethylbenzene to styrene at a temperature of 600-620oWith a feed rate of the raw material 1 liter/liter of catalyst per hour and the mass dilution of the raw water vapor of 1:2. Data for testing of the catalyst shown in the table.

Example 2. The catalyst prepare and test as in example 1, but instead of magnesium oxide used magnesium carbonate, instead of molybdenum oxide is used molybdenum acid instead of potassium silicate is used colloidal solution of silicic acid. Data on the composition and testing of the catalyst shown in the table.

Example 3. The catalyst prepare and test as in example 1, but instead of magnesium oxide using calcium oxide. Data on the composition and testing of the catalyst shown in the table.

Example 4. The catalyst was prepared similarly to portalization per hour, mass dilution of raw water vapor of 1:3. Data on the composition and testing of the catalyst shown in the table.

Example 5. The catalysts prepared similarly to examples 1-3, experience in the reaction of dehydrogenation of ethyltoluene at 600-620oWith the speed of feed of 0.5-1.0 liter/liter of catalyst per hour, the mass dilution of the raw water vapor of 1:3. Data on the composition and testing of catalysts shown in the table.

Example 6. The catalysts prepared similarly to examples 1-3, experience in the reaction of dehydrogenation of diethylbenzene at 620oWith a feed rate of the raw material 1 liter/liter of catalyst per hour, the mass dilution of the raw water vapor is 1:5. Data on the composition and testing of the catalyst shown in the table.

The catalyst for the dehydrogenation of alkylaromatic hydrocarbons, including iron oxide, potassium carbonate, magnesium oxide and/or calcium oxide, molybdenum oxide, cerium oxide and Portland cement, characterized in that it additionally contains chromium oxide, zirconium dioxide, silicon oxide, rubidium oxide or cesium oxide, lanthanum oxide and/or neodymium oxide at the following content, wt.

Potassium carbonate 13,0 25,0

Magnesium oxide and/or calcium oxide 0,5 10,0

Oxide mol,5

The silicon oxide 0,5 5,0

The oxide of rubidium or cesium oxide 0,05 5,0

The oxide of lanthanum and/or neodymium oxide 0,05 1,0

Iron oxide Ostalnoe

 

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