The present invention relates to a catalyst for decomposition of nitrous oxide and also to its method of preparation and use.

The invention discloses a novel method for preparation of highly active and selective dehydrogenation catalyst, comprising of metal oxide of group VIB elements of periodic table, and at least one metal oxide from group IA and/or group VIII, supported on alumina or silica or mixture thereof, wherein the accessibility to active sites and dispersion of metal oxides is enhanced by the addition of carbonaceous material such as coke derived from coal or petroleum coke or any other form of carbon, during catalyst preparation and its combustion thereof during calcination.

This disclosure provides compositions and methods directed to thermally stable catalyst systems, which display stable physical properties and/or stable catalytic properties after thermal pretreatment at a temperature in the range of about 600 C. to about 1000 C. The catalyst systems include metal particles which contain a stable metal and a catalytic metal deposited on a porous support. Embodiments of the disclosure include catalyst systems that can be used in high temperature applications such as the hybrid sulfur cycle. The hybrid sulfur cyclic is an elevated temperature and high acid reaction that may be conducted using concentrated sulfuric acid heated to 800 C. Embodiments of the disclosure can provide thermally stable catalysts and methods to produce thermally stable catalysts that remain active for at least 80 hours' exposure to these harsh conditions.

A catalyst for oxidative dehydrogenation (ODH) of ethane with an empirical formula MoVTeNbPdO produced using a process comprising impregnation of the Pd component on the surface of the catalyst following a calcination step using a Pd compound free of halogens. The resulting catalyst can be used in both diluted and undiluted ODH processes and shows higher than expected activity without any loss of selectivity.

A catalyst for oxidative dehydrogenation (ODH) of ethane with an empirical formula MoVTeNbPdO produced using a process comprising impregnation of the Pd component on the surface of the catalyst following a calcination step using a Pd compound free of halogens. The resulting catalyst can be used in both diluted and undiluted ODH processes and shows higher than expected activity without any loss of selectivity.

Disclosed is a ruthenium-based catalyst for hydrogen production from ammonia decomposition, comprising an active component, a promoter and a carrier, wherein the active component is ruthenium, the promoter is cesium and/or potassium, and the carrier comprises magnesium oxide, an activated carbon, cerium oxide, molybdenum oxide, tungsten oxide, barium oxide and potassium oxide. The present invention further discloses a preparation method and application of the aforementioned ruthenium-based catalyst for hydrogen production from ammonia decomposition. Compared with the prior art, the ruthenium-based catalyst for hydrogen production from ammonia decomposition provided by the present invention is low in preparation cost and simple in process, and has high catalytic activity at low temperature and good heat resistance.

Oxidative dehydrogenation of alkanes employs a catalyst, usually a mixed metal oxide, to convert, in the presence of oxygen, a lower alkane into its corresponding alkene. Continuous operation of an oxidative dehydrogenation process may result in a gradual decrease of catalyst activity and or selection, requiring downtime for regeneration. Provided herein is a process for regeneration of an oxidative dehydrogenation catalyst including initiating regeneration by passing a regeneration gas over the catalyst, monitoring regeneration by comparing the oxygen concentration of the regeneration gas before and after being passed over the catalyst, and ceasing regeneration when the oxygen concentration of the regeneration gas after passed over the catalyst is at least 90% of the concentration of the regeneration gas before being passed over the catalyst.

A compound having the formula (I): ##STR00001##
is disclosed. A method of preparing the compound of formula (I) is also disclosed.

Embodiments of methods of synthesizing a metathesis catalyst system, which include impregnating tungsten oxide on silica support in the presence of a precursor to produce a base catalyst; calcining the base catalyst; dispersing a solid metal-based co-catalyst onto the surface of the base catalyst to produce a doped catalyst; and calcining the doped catalyst to produce a metathesis catalyst system. Further embodiments of processes for the production of propylene, which include contacting a hydrocarbon feedstock comprising a mixture of 1-butene and 2-butene with embodiments of the metathesis catalyst system to produce, via metathesis conversion, a product stream comprising propylene.

Embodiments of methods of synthesizing a metathesis catalyst system, which include impregnating tungsten oxide on silica support in the presence of a precursor to produce a base catalyst; calcining the base catalyst; dispersing a solid metal-based co-catalyst onto the surface of the base catalyst to produce a doped catalyst; and calcining the doped catalyst to produce a metathesis catalyst system. Further embodiments of processes for the production of propylene, which include contacting a hydrocarbon feedstock comprising a mixture of 1-butene and 2-butene with embodiments of the metathesis catalyst system to produce, via metathesis conversion, a product stream comprising propylene.