摘要:
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.
摘要:
A transalkylation catalyst for the transalkylation of a heavy reformate is provided. The catalyst includes two solid acid zeolites having different physical and chemical properties, and at least three metals selected from the group 4 Lanthanoids, and the elements found in groups 6 and 10 of the periodic table.
摘要:
A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. The catalyst comprises copper and a small pore molecular sieve having a maximum ring size of eight tetrahedral atoms. The chemical process undergoes at least one period of exposure to a reducing atmosphere. The catalyst has an initial activity and the catalyst has a final activity after the at least one period of exposure to the reducing atmosphere. The final activity is within 30% of the initial activity at a temperature between 200 and 500° C.
摘要:
The present invention provides a method for producing a tertiary amine by using a secondary amine and an alcohol as starting materials to obtain a corresponding tertiary amine. The method of the present invention includes reacting a secondary amine with an alcohol in the presence of a catalyst, wherein the catalyst is previously used in the reaction of a primary amine with an alcohol to obtain a tertiary amine.
摘要:
A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. The catalyst comprises copper and a small pore molecular sieve having a maximum ring size of eight tetrahedral atoms. The chemical process undergoes at least one period of exposure to a reducing atmosphere. The catalyst has an initial activity and the catalyst has a final activity after the at least one period of exposure to the reducing atmosphere. The final activity is within 30% of the initial activity at a temperature between 200 and 500° C.
摘要:
The present invention relates to a micro-porous crystalline material that is isostructural with the mineral known as boggsite and to a method for preparing same, said material having composition x X2O3: z ZO2: y YO2, wherein: X is a trivalent element such as Al, B, Fe, In, Ga, Cr or mixtures thereof; where (y+z)/x may have values between 9 and infinity; Z corresponds to a tetravalent element selected from Si and Ge or mixtures thereof; Y corresponds to a tetravalent element such as Ti, Sn, Zr, V or mixtures thereof; and z/y may have values between 10 and infinity.
摘要翻译:本发明涉及一种与被称为硼氢化合物的矿物同构的微孔结晶材料及其制备方法,所述材料具有x X 2 O 3 :z ZO 2:y YO 2,其中:X是三价元素,例如 Al,B,Fe,In,Ga,Cr或其混合物; 其中(y + z)/ x可以具有在9和无穷大之间的值; Z对应于选自Si和Ge的四价元素或其混合物; Y对应于四价元素如Ti,Sn,Zr,V或其混合物; z / y可以具有在10和无穷大之间的值。
摘要:
A cold start catalyst is disclosed. The cold start catalyst comprises a zeolite catalyst and a supported platinum group metal catalyst. The zeolite catalyst comprises a base metal, a noble metal, and a zeolite. The supported platinum group metal catalyst comprises one or more platinum group metals and one or more inorganic oxide carriers. The invention also includes an exhaust system comprising the cold start catalyst. The cold start catalyst and the process result in improved NOx storage and NOx conversion, improved hydrocarbon storage and conversion, and improved CO oxidation through the cold start period.
摘要:
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, Jr and Pt.
摘要:
Disclosed are: an exhaust gas purification catalyst which is capable of achieving a higher NOx removal ratio in comparison to conventional exhaust gas purification catalysts; and an exhaust gas purification apparatus which uses the exhaust gas purification catalyst. An exhaust gas purification catalyst comprises: a first catalyst layer that contains Pt and has NOx capturing ability; a second catalyst layer that contains a zeolite that has HC capturing ability; and an intermediate layer that is provided between the first catalyst layer and the second catalyst layer and has NOx reducing ability. The intermediate layer contains, as a main component, at least one oxide selected from the group consisting of CeO2, ZrO2 and complex oxides containing Ce and Zr, and also contains one or both of Rh and Pd. Also specifically disclosed is an exhaust gas purification apparatus which uses the exhaust gas purification catalyst.