Abstract: The present invention relates to a high-performance polyoxometalate catalyst and a method of preparing the same. More particularly, the present invention provides a high-performance polyoxometalate catalyst, the activity and selectivity of which may be improved by controlling the content of vanadium and the like and which has superior reproducibility and may unsaturated carboxylic acid from unsaturated aldehyde in a high yield for a long time, a method of preparing the same, and the like.

Abstract: A method for generating a signal of a broadcasting receiving apparatus is provided. The method includes receiving a broadcasting signal, setting a guide band frequency according to a preset frequency range and a tuned frequency, and transmitting information for the set guide band frequency to at least one external apparatus.

Abstract: Disclosed are a high-performance polyoxometalate catalyst and a method of preparing the same. More particularly, disclosed are a high-performance polyoxometalate catalyst which may enhance activity and selectivity by controlling the content of vanadium, etc. exhibits superior reproducibility, and may produce unsaturated carboxylic acid with high yield and long lifespan from unsaturated aldehyde, and a method of preparing the same.

Abstract: Disclosed are a high-performance polyoxometalate catalyst and a method of preparing the same. More particularly, disclosed are a high-performance polyoxometalate catalyst which may enhance activity and selectivity by controlling the content of vanadium, etc. exhibits superior reproducibility, and may produce unsaturated carboxylic acid with high yield and long lifespan from unsaturated aldehyde, and a method of preparing the same.

Abstract: A television and a control method of the television are provided. The control method of the television includes receiving a broadcasting signal, detecting whether a pilot signal is included in the received broadcasting signal, setting a channel of the broadcasting signal as a channel of a first broadcasting format in response to detecting the pilot signal is included in the received broadcasting signal, and setting the channel of the broadcasting signal as a channel of a second broadcasting format in response to detecting that the pilot signal is not included in the received broadcasting signal.

Abstract: The present invention relates to a catalyst for preparing acrolein and acrylic acid, and a preparation method thereof. The catalyst according to the present invention can be uniformly packed in a reactor and the collapse of the catalyst can be minimized because it has excellent mechanical properties, and it can be stably used for a long period of time.

Abstract: The present invention relates to a catalyst for preparing acrolein and acrylic acid, and use of the same. The catalyst according to the present invention can be uniformly packed in the reactor and collapse of the catalyst can be minimized because it has excellent mechanical properties, and it can lower initial pressure of the reaction by securing stable pore spaces and can be stably used for a long period of time. In addition, the preparation method of acrolein and acrylic acid according to the present invention can provide more improved production efficiency by using the catalyst.

Abstract: A method for generating a signal of a broadcasting receiving apparatus is provided. The method includes receiving a broadcasting signal, setting a guide band frequency according to a preset frequency range and a tuned frequency, and transmitting information for the set guide band frequency to at least one external apparatus.

Abstract: The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst. Further, the present invention provides a method for producing the (meth)acrylic acid without any additional process of converting (meth)acrolein into (meth)acrylic acid.

Abstract: The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst. Further, the present invention provides a method for producing the (meth)acrylic acid without any additional process of converting (meth)acrolein into (meth)acrylic acid.

Abstract: The invention provides a system and method for automatically displaying a user's logged-in status across an Internet based network of affiliated Web sites via a visual indicator such as a toolbar to help the user to be certain about his logged-in status when he stays with one or switches from one to another affiliated Web site.

Abstract: The present invention relates to a method of preparing a heteropoly acid catalyst used for the production of methacrylic acid by gas phase oxidation of methacrolein, more precisely a method of preparing a heteropoly acid catalyst comprising the steps of preparing a slurry by adding metal precursors and ammonium salt to protonic acid Keggin-type heteropoly acid aqueous solution and stirring thereof; and drying, molding and firing the slurry to give a catalyst. The present invention provides a method of preparing a heteropoly acid catalyst exhibiting high methacrolein conversion rate and methacrylic acid selectivity without pre-firing process by using high purity protonic acid Keggin-type heteropoly acid and ammonium salt.

Abstract: The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst. Further, the present invention provides a method for producing the (meth)acrylic acid without any additional process of converting (meth)acrolein into (meth)acrylic acid.

Abstract: The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst. Further, the present invention provides a method for producing the (meth)acrylic acid without any additional process of converting (meth)acrolein into (meth)acrylic acid.

Abstract: The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst.

Abstract: The invention provides a system and method for automatically displaying a user's logged-in status across an Internet based network of affiliated Web sites via a visual indicator such as a toolbar to help the user to be certain about his logged-in status when he stays with one or switches from one to another affiliated Web site.

Abstract: The present invention relates to a catalyst system, an oxidation reactor comprising the same, and a method for producing an acrolein and an acrylic acid by using the same. By using the catalyst system according to the present invention, when acrolein and acrylic acid are produced, since heat accumulation in a catalyst layer may be effectively prevented, catalyst deterioration may be prevented, and the catalyst may be stably used for a long period of time. In addition, an acrolein and an acrylic acid may be produced at high selectivity and high yield.

Abstract: The invention provides a system and method for automatically displaying a user's logged-in status across an Internet based network of affiliated Web sites via a visual indicator such as a toolbar to help the user to be certain about his logged-in status when he stays with one or switches from one to another affiliated Web site.

Abstract: Disclosed is a shell-and-tube reactor that may be used for fixed-bed catalytic partial oxidation, the reactor being characterized by including at least one reaction zone of a first-step reaction zone for mainly producing unsaturated aldehydes and a second-step reaction zone for mainly producing unsaturated acids, wherein at least one reaction zone of the above reaction zones comprises two or more catalytic layers; each of the catalytic layers is packed with a formed product of catalyst that is different in pore density and/or pore size in a catalytically active component; and the pore density and/or pore size is controlled in such a manner that specific surface area of the catalytically active component increases from the inlet of the reactor to the outlet of the reactor. A method for producing unsaturated aldehydes and/or unsaturated fatty acids from olefins using the same reactor is also disclosed.

Abstract: The present invention relates to a method of preparing a heteropoly acid catalyst used for the production of methacrylic acid by gas phase oxidation of methacrolein, more precisely a method of preparing a heteropoly acid catalyst comprising the steps of preparing a slurry by adding metal precursors and ammonium salt to protonic acid Keggin-type heteropoly acid aqueous solution and stirring thereof; and drying, molding and firing the slurry to give a catalyst. The present invention provides a method of preparing a heteropoly acid catalyst exhibiting high methacrolein conversion rate and methacrylic acid selectivity without pre-firing process by using high purity protonic acid Keggin-type heteropoly acid and ammonium salt.