An enamel composition having improved cleaning performance, a method of preparing the enamel composition, and a cooking device having the enamel composition are disclosed. The enamel composition includes glass frit and a metal oxide catalyst, wherein the metal oxide catalyst includes at least one of a unary metal oxide or a binary metal oxide, thereby allowing cleaning at room temperature while exhibiting good fouling resistance to allow easy removal of oil contaminants, such as chicken fat.

An enamel composition having improved cleaning performance, a method of preparing the enamel composition, and a cooking device having the enamel composition are disclosed. The enamel composition includes glass frit and a metal oxide catalyst, wherein the metal oxide catalyst includes at least one of a unary metal oxide or a binary metal oxide, thereby allowing cleaning at room temperature while exhibiting good fouling resistance to allow easy removal of oil contaminants, such as chicken fat.

Disclosed are a mesoporous composite oxide catalyst, a method for preparing the same and a method for synthesizing 1,3-butadidne using the same. The surface area is increased by introducing certain porous silica into preparation of a catalyst for synthesizing 1,3-butadiene, thereby improving a conversion ratio of normal-butene, and selectivity and yield of 1,3-butadiene, and providing economic efficiency from the viewpoint of decreasing an amount of used metal and reducing catalyst production cost.

Disclosed is a multi-component bismuth molybdate catalyst for production of butadiene which comprises bismuth, molybdenum and at least one metal having a monovalent, divalent or trivalent cation, and further comprises cesium and potassium and thus has advantages of improving conversion ratio, yield and selectivity of butadiene and of providing stability of process operation.

Disclosed is a multi-component bismuth molybdate catalyst for production of butadiene which comprises bismuth, molybdenum and at least one metal having a monovalent, divalent or trivalent cation, and further comprises cesium and potassium and thus has advantages of improving conversion ratio, yield and selectivity of butadiene and of providing stability of process operation.

The present specification relates to a preparation method for rod-shaped molybdenum oxide and a preparation method for a molybdenum oxide composite, the preparation method for rod-shaped molybdenum oxide according to the present invention may be carried out under low temperature and pressure conditions, and thus has an advantage in that it is possible to mass produce rod-shaped molybdenum oxide, and the preparation method for a molybdenum oxide composite according to the present invention has an advantage in that the molybdenum oxide composite may be synthesized at a temperature which is equal to or less than the boiling point of ethanol, and the amount of an ethanol solvent used is reduced.

The present specification relates to a preparation method for rod-shaped molybdenum oxide and a preparation method for a molybdenum oxide composite, the preparation method for rod-shaped molybdenum oxide according to the present invention may be carried out under low temperature and pressure conditions, and thus has an advantage in that it is possible to mass produce rod-shaped molybdenum oxide, and the preparation method for a molybdenum oxide composite according to the present invention has an advantage in that the molybdenum oxide composite may be synthesized at a temperature which is equal to or less than the boiling point of ethanol, and the amount of an ethanol solvent used is reduced.

The present invention discloses a bismuth oxide (Bi.sub.2O.sub.3)/bismuth subcarbonate ((BiO).sub.2CO.sub.3)/bismuth molybdate (Bi.sub.2MoO.sub.6) composite photocatalyst, including a Bi.sub.2MoO.sub.6 photocatalyst, where Bi.sub.2O.sub.3 and (BiO).sub.2CO.sub.3 nanosheets are introduced to a surface of the Bi.sub.2MoO.sub.6 through addition of Na.sub.2CO.sub.3 and roasting. The present invention also discloses a preparation method of the Bi.sub.2O.sub.3/(BiO).sub.2CO.sub.3/Bi.sub.2MoO.sub.6 composite photocatalyst which is specifically implemented by the following steps: step 1: preparing a Bi.sub.2MoO.sub.6 photocatalyst; step 2: introducing Bi.sub.2O.sub.3 and (BiO).sub.2CO.sub.3 nanosheets to a surface of the Bi.sub.2MoO.sub.6 photocatalyst obtained in step 1 through addition of Na.sub.2CO.sub.3 and roasting to obtain the Bi.sub.2O.sub.3/(BiO).sub.2CO.sub.3/Bi.sub.2MoO.sub.6 composite photocatalyst. The photocatalyst of the present invention has no agglomeration, a wide responsive range of visible light, a significantly improved catalytic activity compared with a Bi.sub.2MoO.sub.6 alone, and excellent reusability. Moreover, the preparation method is simple with mild conditions, desired controllability and convenient operation.

The present invention discloses a bismuth oxide (Bi.sub.2O.sub.3)/bismuth subcarbonate ((BiO).sub.2CO.sub.3)/bismuth molybdate (Bi.sub.2MoO.sub.6) composite photocatalyst, including a Bi.sub.2MoO.sub.6 photocatalyst, where Bi.sub.2O.sub.3 and (BiO).sub.2CO.sub.3 nanosheets are introduced to a surface of the Bi.sub.2MoO.sub.6 through addition of Na.sub.2CO.sub.3 and roasting. The present invention also discloses a preparation method of the Bi.sub.2O.sub.3/(BiO).sub.2CO.sub.3/Bi.sub.2MoO.sub.6 composite photocatalyst which is specifically implemented by the following steps: step 1: preparing a Bi.sub.2MoO.sub.6 photocatalyst; step 2: introducing Bi.sub.2O.sub.3 and (BiO).sub.2CO.sub.3 nanosheets to a surface of the Bi.sub.2MoO.sub.6 photocatalyst obtained in step 1 through addition of Na.sub.2CO.sub.3 and roasting to obtain the Bi.sub.2O.sub.3/(BiO).sub.2CO.sub.3/Bi.sub.2MoO.sub.6 composite photocatalyst. The photocatalyst of the present invention has no agglomeration, a wide responsive range of visible light, a significantly improved catalytic activity compared with a Bi.sub.2MoO.sub.6 alone, and excellent reusability. Moreover, the preparation method is simple with mild conditions, desired controllability and convenient operation.

The present invention relates to a catalyst for oxidative dehydrogenation of butene and a method for producing the same. The catalyst for oxidative dehydrogenation of butene has a large amount of Mo—Bi phase acting as a reaction active phase on the surface, and therefore, can exhibit high catalytic activity, high conversion rate and high butadiene selectivity in the oxidative dehydrogenation of butene.