The present invention relates to a method for producing unsaturated aldehydes and unsaturated carboxylic acids. According to the present invention, a method for producing unsaturated aldehydes and unsaturated carboxylic acids which can impart activity and control temperature independently in fixed catalyst layer zones in a shell-and-tube reactor, thereby exhibiting improved yield and operation stability, is provided.

A method for producing an ammoxidation catalyst, comprising: a step of preparing a precursor slurry that is a precursor of the catalyst; a drying step of obtaining a dry particle from the precursor slurry; and a calcination step of calcining the dry particle, wherein the step of preparing the precursor slurry is a step of mixing a first solution or slurry having a first pH and a second solution or slurry to obtain a solution or slurry having a second pH after completion of mixing, a time during which a pH of a mixture passes through a particular range having an upper limit and a lower limit while the second solution or slurry is mixed is 1-70 seconds, he upper limit and the lower limit being designated as a third pH and a fourth pH respectively, and the third pH and the fourth pH are set between the first pH and the second pH.

A method for producing an ammoxidation catalyst, comprising: a step of preparing a precursor slurry that is a precursor of the catalyst; a drying step of obtaining a dry particle from the precursor slurry; and a calcination step of calcining the dry particle, wherein the step of preparing the precursor slurry is a step of mixing a first solution or slurry having a first pH and a second solution or slurry to obtain a solution or slurry having a second pH after completion of mixing, a time during which a pH of a mixture passes through a particular range having an upper limit and a lower limit while the second solution or slurry is mixed is 1-70 seconds, he upper limit and the lower limit being designated as a third pH and a fourth pH respectively, and the third pH and the fourth pH are set between the first pH and the second pH.

The present disclosure provides a multi-metallic catalyst system comprising at least one support, and at least one promoter component and an active component comprising at least two metals uniformly dispersed on the support. The present disclosure also provides a process for preparing the multi-metallic catalyst system. Further, the present disclosure provides a process for preparing upgraded fuel from biomass. The process is carried out in two steps. In the first step, a biomass slurry is prepared and is heated in the presence of hydrogen and a multi-metallic catalyst that comprises at least one support, at least one promoter component, and an active component comprising at least two metals to obtain crude biofuel as an intermediate product. The intermediate product obtained in the first step is then cooled and filtered to obtain a filtered intermediate product. In the second step, the filtered intermediate product is hydrogenated in the presence of the multi-metallic catalyst to obtain the upgraded fuel. The fuel obtained from the process of the present disclosure is devoid of heteroatoms such as oxygen, nitrogen and sulfur.

A sulfur-tolerant catalyst can be used in the sulfur-tolerant shift catalytic reaction. The catalyst has a carrier and a molybdenum oxide, a cobalt oxide and a cobalt-molybdenum-based perovskite composite oxide carried thereon. The cobalt-molybdenum-based perovskite composite oxide contains a molybdenum element, a cobalt element, an A element, and an oxygen element. The A element is one or more selected from a group consisting of a rare-earth metal element, an alkali metal element and an alkaline earth metal element.

A sulfur-tolerant catalyst can be used in the sulfur-tolerant shift catalytic reaction. The catalyst has a carrier and a molybdenum oxide, a cobalt oxide and a cobalt-molybdenum-based perovskite composite oxide carried thereon. The cobalt-molybdenum-based perovskite composite oxide contains a molybdenum element, a cobalt element, an A element, and an oxygen element. The A element is one or more selected from a group consisting of a rare-earth metal element, an alkali metal element and an alkaline earth metal element.

A catalyst precursor represented by the following formula (1) having an average particle diameter (D50), which is a particle diameter at which a cumulative volume fraction is 50%, of 10 ?m or more and 40 ?m or less.

Mo.sub.a1Bi.sub.b1Ni.sub.c1Co.sub.d1Fe.sub.e1X.sub.f1Y.sub.g1Z.sub.h1O.sub.i1(1) where, Mo, Bi, Ni, Co and Fe represent molybdenum, bismuth, nickel, cobalt, and iron, respectively; X is tungsten or the like; Y is potassium or the like; and Z belongs to the 1st to 16th groups in the periodic table and represents at least one element selected from elements other than the above Mo, Bi, Ni, Co, Fe, X, and Y.

This document relates to oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and iron; oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, and aluminum; and oxidative dehydrogenation catalyst materials that include molybdenum, vanadium, oxygen, iron, and aluminum.

The present invention relates to a process for preparing molybdenum-bismuth-iron-cobalt-based multielement oxide catalysts by means of hydrothermal synthesis, wherein the hydrothermal synthesis is conducted with an aqueous solution and/or an aqueous suspension of precursor compounds of the elements present in the multielement oxide catalyst to be prepared, the pH of which has been adjusted to a value between about 6 and about 8. The present invention also further relates to the multielement oxide catalysts obtainable by this process and to the use thereof in the partial gas phase oxidation of olefins and tert-butanol.

The present invention relates to a process for preparing molybdenum-bismuth-iron-cobalt-based multielement oxide catalysts by means of hydrothermal synthesis, wherein the hydrothermal synthesis is conducted with an aqueous solution and/or an aqueous suspension of precursor compounds of the elements present in the multielement oxide catalyst to be prepared, the pH of which has been adjusted to a value between about 6 and about 8. The present invention also further relates to the multielement oxide catalysts obtainable by this process and to the use thereof in the partial gas phase oxidation of olefins and tert-butanol.