Process for production of supported catalyst for acetic acid production
View Patent ↗A process for production of a supported catalyst that, when used for production of lower aliphatic carboxylic acids from oxygen and lower olefins, improves yields of the lower aliphatic carboxylic acids and minimizes production of carbon dioxide gas (CO 2 ) by-product compared to the prior art. A compound comprising at least one element selected from elements of Groups 8, 9 and 10 of the Periodic Table, at least one chloride of an element selected from copper, silver and zinc, and a chloroauric acid salt, are loaded on a carrier, after which there are further loaded a compound comprising at least one element selected from gallium, indium, thallium, germanium, tin, lead, phosphorus, arsenic, antimony, bismuth, sulfur, selenium, tellurium and polonium, and a heteropoly acid.
1. A process for production of a supported catalyst to be used for production of a lower aliphatic carboxylic acid from a lower olefin and oxygen, characterized by comprising the following first, second and third steps in order
First step
A step of impregnating a carrier with a solution containing at least one compound comprising at least one element selected from elements of Groups 8, 9 and 10 of the Periodic Table (hereinafter referred to as (a) group compound), at least one chloride of an element selected from copper, silver and zinc (hereinafter referred to as (d) group compound), and an alkali metal salt of chloroauric acid, to obtain an impregnated carrier (A)
Second step
A step of contacting the impregnated carrier (A) with an alkaline substance and a compound comprising at least one element selected from gallium, indium, thallium, germanium, tin, lead, phosphorus, arsenic, antimony, bismuth, sulfur, selenium, tellurium and polonium (hereinafter referred to as (b) group compound) to obtain impregnated carrier (B) (where the alkaline substance and the (b) group compound may be contacted with impregnated carrier (A) either simultaneously or separately)
Third step
A step of contacting impregnated carrier (B) with a reducing substance to obtain supported catalyst (C).
2. The process for production of a supported catalyst according to claim 1 , which further comprises a step of loading at least one compound selected from heteropoly acids and their salts (hereinafter referred to as (c) group compound) on the carrier.
3. The process for production of a supported catalyst according to claim 2 , wherein the polyatom of the heteropoly acid and/or its salt as (c) group compound is tungsten and/or molybdenum.
4. The process for production of a supported catalyst according to claim 2 , wherein the heteroatom of the heteropoly acid and/or its salt as the (c) group compound is at least one element selected from phosphorus, silicon and boron.
5. The process for production of a supported catalyst according to claim 2 , wherein the heteropoly acid and/or its salt as the (c) group compound is at least one compound selected from silicotungstic acid, phosphotungstic acid, silicomolybdic acid, phosphomolybdic acid and salts thereof.
6. The process for production of a supported catalyst according to claim 2 , wherein the (d) group compound is zinc chloride.
7. The process for production of a supported catalyst according to claim 1 , wherein the (d) group compound is zinc chloride.
8. The process for production of a supported catalyst according to claim 1 , wherein the (a) group compound is a compound comprising at least one element selected from ruthenium, osmium, rhodium, iridium, palladium and platinum.
9. The process for production of a supported catalyst according to claim 1 , wherein the (b) group compound is a compound comprising at least one element selected from gallium, germanium, tin, lead, bismuth, selenium and tellurium.
10. A supported catalyst for production of acetic acid by reaction between ethylene and oxygen, which is produced by a process according to claim 1 .