A method for preparing an active catalyst for high-efficiency denitration is disclosed. The method includes: a catalyst raw material is charged into a denitration reactor, NH.sub.3 and an inert gas are introduced and then heating is performed, and the temperature is held and then natural cooling is performed, thereby obtaining the catalyst. The active catalyst can greatly improve the denitration activity in low temperature range, and can not only improve the denitration efficiency under the condition without SO.sub.2 and H.sub.2O, but also can improve the denitration efficiency under the condition with both SO.sub.2 and H.sub.2O. The service life of the catalyst is prolonged under the premise of not changing the existing catalyst preparation process, and the economic benefit is significant. The denitration efficiency of a powder catalyst can be increased by 25%, and the denitration efficiency of a honeycombed catalyst or a corrugated catalyst can be increased by 20%.

The present invention is in the field of heterogeneous catalysis. Particularly, the present invention relates to a process for preparing catalysts advantageously usable in the hydrotreatment processes, for example in hydrodesulphurization, hydrodenitrogenation, hydrodearomatization processes of hydrocarbons. More in particular, the present invention relates to a process for obtaining said catalysts, which comprise mixed oxides of Nickel, Aluminum, Molybdenum and Tungsten and optionally a transition metal Me selected from the group consisting of Zn, Mn, Cd, and a mixture thereof, an organic component C, and possibly an inorganic binder B. Said mixed oxides comprise an amorphous phase and a pseudo-crystalline phase isostructural to Wolframite. The present invention further relates to said hydrotreatment catalysts and a hydrotreatment process wherein said catalysts are used.

The present invention is in the field of heterogeneous catalysis. Particularly, the present invention relates to a process for preparing catalysts advantageously usable in the hydrotreatment processes, for example in hydrodesulphurization, hydrodenitrogenation, hydrodearomatization processes of hydrocarbons. More in particular, the present invention relates to a process for obtaining said catalysts, which comprise mixed oxides of Nickel, Aluminum, Molybdenum and Tungsten and optionally a transition metal Me selected from the group consisting of Zn, Mn, Cd, and a mixture thereof, an organic component C, and possibly an inorganic binder B. Said mixed oxides comprise an amorphous phase and a pseudo-crystalline phase isostructural to Wolframite. The present invention further relates to said hydrotreatment catalysts and a hydrotreatment process wherein said catalysts are used.

There are provided an ammoxidation catalyst for propylene, a manufacturing method of the same, and an ammoxidation method of propylene using the same. Specifically, according to one embodiment of the invention, a catalyst is realized with a structure in which metal oxide is supported on a silica carrier, and thus, using mesopores useful for adsorption and desorption of gas, a high reaction surface area can be provided, and ultimately, ammoxidation of propylene can be increased.

There are provided an ammoxidation catalyst for propylene, a manufacturing method of the same, and an ammoxidation method of propylene using the same. Specifically, according to one embodiment of the invention, a catalyst is realized with a structure in which metal oxide is supported on a silica carrier, and thus, using mesopores useful for adsorption and desorption of gas, a high reaction surface area can be provided, and ultimately, ammoxidation of propylene can be increased.

This document relates to oxidative dehydrogenation catalysts that include molybdenum, vanadium, and oxygen.

This document relates to oxidative dehydrogenation catalysts that include molybdenum, vanadium, and oxygen.

A method of loading granules into reaction tubes of a vertical multitube reactor installed in a vertical direction by dropping the granules from above each of the reaction tubes in a state that a linear member is inserted and suspended in the reaction tube. The reaction tube has an effective length of 1000 mm or more. The linear member includes a small-diameter portion positioned on an upper side and a large-diameter portion continuously extending from the small-diameter portion. The small-diameter portion has an outer diameter (Ra) of 5.0 mm or less, and the large-diameter portion has an outer diameter (Rb) of 5.0 to 15.0 mm larger than the outer diameter (Ra). A length of the small-diameter portion from an upper end of the reaction tube is 10.0 mm or more. A distance between an upper surface of a granule loaded layer formed inside the reaction tube and a lower end of the linear member inserted in the reaction tube is 100 mm or more.

A method of loading granules into reaction tubes of a vertical multitube reactor installed in a vertical direction by dropping the granules from above each of the reaction tubes in a state that a linear member is inserted and suspended in the reaction tube. The reaction tube has an effective length of 1000 mm or more. The linear member includes a small-diameter portion positioned on an upper side and a large-diameter portion continuously extending from the small-diameter portion. The small-diameter portion has an outer diameter (Ra) of 5.0 mm or less, and the large-diameter portion has an outer diameter (Rb) of 5.0 to 15.0 mm larger than the outer diameter (Ra). A length of the small-diameter portion from an upper end of the reaction tube is 10.0 mm or more. A distance between an upper surface of a granule loaded layer formed inside the reaction tube and a lower end of the linear member inserted in the reaction tube is 100 mm or more.

The present development is a metal particle coated nanowire catalyst for use in the hydrodesulfurization of fuels and a process for the production of the catalyst. The catalyst comprises titanium(IV) oxide nanowires wherein the nanowires are produced by exposure of a TiO.sub.2—KOH paste to microwave radiation. Metal particles selected from the group consisting of molybdenum, nickel, cobalt, tungsten, or a combination thereof, are impregnated on the metal oxide nanowire surface. The metal impregnated nanowires are sulfided to produce catalytically-active metal particles on the surface of the nanowires The catalysts of the present invention are intended for use in the removal of thiophenic sulfur from liquid fuels through a hydrodesulfurization (HDS) process in a fixed bed reactor. The presence of nanowires improves the HDS activity and reduces the sintering effect, therefore, the sulfur removal efficiency increases.