The present invention relates to a method for preparing acrylic acid from glycerin. More specifically, the present invention provides a method which can improve the selectivity of acrolein by applying a specific catalyst composition and process conditions to minimize the generation of coke carbon of the catalyst, and can prepare acrylic acid with higher productivity for a longer duration of time because a dehydration reaction can be performed for a longer working period while maintaining catalyst activity at a high level during the reaction.

The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus modified with alkali metal. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed.

The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus modified with alkali metal. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed.

A catalyst for gas-phase oxidation of 1,2,4,5-tetraalkylbenzene to prepare benzene-1,2,4,5-tetracarboxylic dianhydride, a preparation method for and an application of the catalyst, and a preparation method for benzene-1,2,4,5-tetracarboxylic dianhydride are disclosed. The catalyst according to the present invention comprises a carrier and a catalytically active component coating attached to the carrier; the catalytically active component coating comprises a first coating and a second coating; the first coating is close to the surface of the carrier, and the second coating is distant from the surface of the carrier; in the first coating, the mass ratio of a titanium element denoted by Ti to a vanadium element denoted by V is Ti/V.sup.1; in the second coating, the mass ratio of the titanium element denoted by Ti to the vanadium element denoted by V is Ti/V.sup.2, wherein Ti/V.sup.2=Ti/V.sup.1+?Ti/V, and ?Ti/V is within a range of 3 to 9.

A catalyst for gas-phase oxidation of 1,2,4,5-tetraalkylbenzene to prepare benzene-1,2,4,5-tetracarboxylic dianhydride, a preparation method for and an application of the catalyst, and a preparation method for benzene-1,2,4,5-tetracarboxylic dianhydride are disclosed. The catalyst according to the present invention comprises a carrier and a catalytically active component coating attached to the carrier; the catalytically active component coating comprises a first coating and a second coating; the first coating is close to the surface of the carrier, and the second coating is distant from the surface of the carrier; in the first coating, the mass ratio of a titanium element denoted by Ti to a vanadium element denoted by V is Ti/V.sup.1; in the second coating, the mass ratio of the titanium element denoted by Ti to the vanadium element denoted by V is Ti/V.sup.2, wherein Ti/V.sup.2=Ti/V.sup.1+?Ti/V, and ?Ti/V is within a range of 3 to 9.

The present invention relates to a method for preparing hydrocarbon double acids using a cyclic hydrocarbon oxidation catalyst, wherein adipic acid and dodecanedioic acid may be produced with high yield while solving the problem of environmental pollution, the adipic acid and the dodecanedioic acid being prepared by using an oxidation reaction of a cyclohexane-cyclohexanone mixture and an oxidation reaction of a cyclododecane-cyclododecanone mixture, respectively, in the presence of a vanadium phosphate oxide-based catalyst and/or a cobalt-manganese oxide-based catalyst.

The present invention relates to a method for preparing hydrocarbon double acids using a cyclic hydrocarbon oxidation catalyst, wherein adipic acid and dodecanedioic acid may be produced with high yield while solving the problem of environmental pollution, the adipic acid and the dodecanedioic acid being prepared by using an oxidation reaction of a cyclohexane-cyclohexanone mixture and an oxidation reaction of a cyclododecane-cyclododecanone mixture, respectively, in the presence of a vanadium phosphate oxide-based catalyst and/or a cobalt-manganese oxide-based catalyst.

The invention relates to a catalyst molded body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition containing vanadium, phosphorus and oxygen. The shaped catalyst body has an essentially cylindrical body having a longitudinal axis. The cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body. The catalyst molded body has a large outer surface area, a lower pressure loss and sufficient mechanical stability.

The invention relates to a catalyst molded body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition containing vanadium, phosphorus and oxygen. The shaped catalyst body has an essentially cylindrical body having a longitudinal axis. The cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body. The catalyst molded body has a large outer surface area, a lower pressure loss and sufficient mechanical stability.

A process has been developed for preparing a Fischer-Tropsch catalyst precursor and a Fischer-Tropsch catalyst made from the precursor. The process includes preparing a catalyst precursor by contacting a boehmite material with a stabilizer containing vanadium-phosphorus. The boehmite material includes two or more different crystalline boehmites having the same average crystallite size to the nearest whole nanometer and having differing properties selected from surface area, pore volume, density and combinations thereof. The boehmite material is subjected to at least one heat treatment at a temperature of at least 500 C., either before or after the contacting step to obtain a stabilized catalyst support having a pore volume of at least 0.3 cc/g. A catalytic metal or a compound containing cobalt is applied to the stabilized catalyst support to form the catalyst precursor. Finally, the catalyst precursor is reduced to activate the catalyst precursor to obtain the Fischer Tropsch catalyst. The catalyst has enhanced hydrothermal stability as measured by losing no more than 6% of its pore volume when exposed to water vapor.