Abstract:
The present invention pertains to a process for the treatment of waste gas, preferably engine exhaust gas, in particular diesel or gasoline exhaust gas, wherein the waste gas is contacted with a zeolite Y which has a unit cell size of 24, 17-24.45 Å, a water adsorption capacity (p/p0 = 0.2, T=25°C) of at most 5 wt.%, and a silica-alumina molar ratio of at least 40. The zeolite is used in adsorbent or catalytic applications, with catalytic applications particularly including oxidation., NOx conversion, and NOx trapping. The invention also pertains to a unit for use in this application comprising the specified zeolite. It has been found that a zeolite with the specified properties has a high temperature stability under the conditions prevailing in this application. The use of this specific zeolite in this specific application leads to an adsorbent/catalyst with high activity and long life.
Abstract:
A composition comprising FCC catalyst particles and additive particles suitable for the reduction of NOx emissions from a FCC regenerator, said additive particles comprising a Mg and Al-containing anionic clay or solid solution, a rare earth metal oxide, alumina and/or silica-alumina, and Y-type zeolite. The invention further relates to a process for preparing such a composition and its use for reducing NOx emissions.
Abstract:
The invention pertains to a process and catalyst for removing arsenic and one or more other metal compounds, e.g. silicon, vanadium and nickel, from a hydrocarbon feedstock. The catalyst comprises a molybdenum compound and a nickel compound on a carrier. The catalyst has a surface area of at least 200 m2/g. Next to contaminant removal, the catalyst is also suitable for hydrodesulphurisation, hydrodenitrogenation and/or hydrygenation.
Abstract:
The present invention relates to a continuous alkylation process wherein an alkylatable compound is reacted with an alkylation agent in the presence of a solid acid alkylation catalyst to form an alkylate and wherein the catalyst is regenerated, said process being performed in an apparatus comprising a series of at least two catalyst-containing reactors (4A,5A) in a zone A and a series of at least two catalyst-containing reactors (4B,5B) in a zone B, in which process (a) the zone A reactors and the zone B reactors cycle back and forth per zone between the alkylation mode and the mild regeneration mode, (b) the alkylation mode comprises introducing an alkylation agent into a first reactor (4A,4B) of the zone through which the alkylatable compound passes, reacting a portion of the alkylatable compound with at least a portion of the alkylation agent to produce an alkylate-containing product stream, and performing this operation at least once more in a downstream reactor (5A,5B) in the same zone employing, instead of said alkylate compound, a stream comprising said alkylate-containing product stream which may or may not have been subjected to a prior intermittent separation during which a portion of the alkylate has been removed, to produce an alkylation mode alkylate-containing effluent, (c) the mild regeneration mode comprises contacting the solid acid alkylation catalyst with hydrogen in each of the at least two reactors of the zone, (d) alkylate is recovered.
Abstract:
Compositions and methods suitable for removing poisonous metals from hydrocarbons are provided. The composition comprises hydrotalcite having one or more trapping metals dispersed on the outer surface thereof.