Catalytic removal of NO

A method of converting nitrogen oxides in a gas to nitrogen by contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a zeolite catalyst containing at least one transition metal, wherein the zeolite is a small pore zeolite containing a maximum ring size of eight tetrahedral atoms, wherein the at least one transition metal is selected from the group consisting of Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir and Pt.

Transition metal/zeolite scr catalysts

A novel catalyst for catalytic reduction of nitrogen oxide using a hydrocarbon as a reducing agent is provided, which comprises (a) at least an element of the platinum group selected from the group consisting of platinum, iridium, rhodium and ruthenium and (b) gold, and which may further comprises (c) at least a metallic oxide selected from the group consisting of cerium oxide, lanthanum oxide, neodymium oxide, germanium oxide and gallium oxide.

Catalyst for catalytic reduction of nitrogen oxides

Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.

Copper cha zeolite catalysts

Apparatus and method for volatilizing a source reagent susceptible to particle generation or presence of particles in the corresponding source reagent vapor, in which such particle generation or presence is suppressed by structural or processing features of the vapor generation system. Such apparatus and method are applicable to liquid and solid source reagents, particularly solid source reagents such as metal halides, e.g., hafnium chloride. The source reagent in one specific implementation is constituted by a porous monolithic bulk form of the source reagent material. The apparatus and method of the invention are usefully employed to provide source reagent vapor for applications such as atomic layer deposition (ALD) and ion implantation.

Solid precursor-based delivery of fluid utilizing controlled solids morphology

A process for removing nitrogen oxides from an exhaust gas by bringing the exhaust gas containing nitrogen oxides into contact with at least one catalyst selected from a polyvalent metal phosphate, a polyvalent metal sulfate or an aluminate of a transition metal of the 4th period of the Periodic Table in an oxidizing atmosphere containing excess oxygen and in the presence of a hydrocarbon or an oxygen containing organic compound. There is also disclosed a process for removing nitrogen oxides from an exhaust gas which comprises bringing the exhaust gas into contact with the above catalyst and then with an oxidation catalyst.

Process for removing nitrogen oxides from exhaust gases

The effect of various metal additives on the catalytic performance of A12O3 was investigated for the selective reduction of NO by methanol in oxidizing atmosphere. The addition of Sn promoted the catalytic activity of alumina for the NO reduction at low temperatures. Moreover, it was found that Sn/Al2O3 catalyst maintained its high activity even in the presence of SO2.

Promotive effect of Sn on the catalytic activity of Al2O3 for the selective reduction of NO by methanol

PURPOSE: To obtain a gasoline fraction and a kerosine or light oil fraction, in high selectivity, by reacting a synthetic gas using a catalyst consisting of a metal or a metallic compound and a carrier composed of a metallic oxide wherein the pore diameter distribution has a very sharp peak at the micropore range. CONSTITUTION: A synthetic gas which is a mixture of CO and/or CO 2 and H 2 at a molar ratio of 0.5W3.0 is passed through a catalyst layer composed of (A) 100pts.wt. of a metallic oxide carrier having a pore diameter distribution having a very sharp peak within a micropore range of 10W100Å (especially 1W30Å), (B) 0.1W50pts.wt. of a metal or a metallic compound having catalytic activity to reduce CO and/or CO 2 , and (C) 0.1W17pts.wt. of an alkali metal, and is made to react at 200W350°C and 0W100kg/cm 2 A pressure at a space velocity of 500W 5,000/hr to obtain an intermediate fraction such as gasoline fraction, kerosine or light oil fraction, etc. An extremely preferable example of the catalyst is Ru catalyst supported on a carrier such as γ-alumina having the above specific pore distribution. COPYRIGHT: (C)1985,JPO&Japio

Production of hydrocarbon

A process for removing nitrogen oxide from exhaust is disclosed, comprising contacting exhaust containing nitrogen oxide with an alumina catalyst which contains not more than 0.5% by weight of an alkali metal and/or an alkaline earth metal and has a total pore volume of from 0.48 to 1.2 cm 3 ·g -1 with 0.26 to 0.6 cm 3 ·g -1 of the total pore volume being formed of pores of not greater than 80 Å or has a volume of pores formed of pores of not greater than 60 Å of from 0.06 to 0.2 cm 3 ·g -l and which may have supported thereon tin in an oxidative atmosphere containing excess oxygen in the presence of a hydrocarbon or an oxygen-containing organic compound.

Fujio Suganuma

Papers

Catalyst for catalytic reduction of nitrogen oxides

Process for removing nitrogen oxides from exhaust gases

Promotive effect of Sn on the catalytic activity of Al2O3 for the selective reduction of NO by methanol

Production of hydrocarbon

Removal of nitrogen oxide from exhaust gas