摘要:
A method of making a nanoparticle catalyst composition including: a single heating of an aqueous salt solution comprising a Ce, a Zr, a rare earth dopant, and a transition metal oxide precursor to provide nanoparticles, the nanoparticles have a compositional gradient comprised of a CeZrREO2, where RE is a rare earth, and the outer portion of the nanoparticles has a Ce:Zr ratio different from the inner portion of the nanoparticles. Also disclosed is a nanoparticle-catalyst composition and articles containing the composition, as defined herein.
摘要:
A catalyst body which includes ceria:zirconia and a metal-zeolite, and is substantially free, or free, of tungsten or tungsten compounds, and methods of manufacture. The ceria and zirconia are present with a zirconia/ceria mole ratio of less than or equal to 1.0. The catalyst body is especially useful in NOx reduction applications.
摘要:
A method of making a nanoparticle catalyst composition including: a single heating of an aqueous salt solution comprising a Ce, a Zr, a rare earth dopant, and a transition metal oxide precursor to provide nanoparticles, the nanoparticles have a compositional gradient comprised of a CeZrREO2, where RE is a rare earth, and the outer portion of the nanoparticles has a Ce:Zr ratio different from the inner portion of the nanoparticles. Also disclosed is a nanoparticle-catalyst composition and articles containing the composition, as defined herein.
摘要:
A catalyst body which includes ceria:zirconia and a metal-zeolite, and is substantially free, or free, of tungsten or tungsten compounds, and methods of manufacture. The ceria and zirconia are present with a zirconia/ceria mole ratio of less than or equal to 1.0. The catalyst body is especially useful in NOx reduction applications.
摘要:
A batch composition for making a highly porous honeycomb ceramic catalytic filter article, including base inorganic components including a mixture of a nano-zeolite powder, and an inorganic filler, in amounts defined herein; and super additives including: a mixture of at least two pore formers; a binder; and a metal salt, in amounts defined herein. Also disclosed are extruded catalyst filter articles and methods for making the articles.
摘要:
The disclosure provides a composition including a porous cordierite honeycomb body as defined herein having excellent strength, high thermal shock resistance, and reduced microcrack properties. The disclosure also provides methods of making and using the composition, for example, as a catalyst carrier.
摘要:
Disclosed are ceramic articles comprising a sintered phase ceramic composition containing, as expressed on a weight percent oxide basis: a(Al2TiO5)+b(ZrTiO4)+c(Y2O3)+d(YPO4) wherein “a, b, c, and d” represent weight fractions of each component such that (a+b+c+d)=1.00 and wherein 0.5
摘要翻译:公开了一种包含烧结相陶瓷组合物的陶瓷制品,其含有以氧化物重量百分数表示的:(Al 2 TiO 5)+ b(ZrTiO 4)+ c(Y 2 O 3)+ d(YPO 4),其中“a,b,c和d “表示每个组分的重量分数,使得(a + b + c + d)= 1.00,并且其中0.5
摘要:
Honeycomb catalyst structures and methods of using them, where the structures have honeycomb channel walls of selective catalytic reduction catalyst, the channel walls occupy at least 20% of the volume of the structure, the structure exhibits a pressure drop for flowing air not exceeding about 110 Pa at a space velocity of 20,000 hr−1, and the channel walls are of a thickness insuring high degree of catalyst utilization and NOx conversion efficiency.
摘要:
A method of manufacturing a catalyst body which includes: combining one or more inorganic components with an inorganic binder, and optionally with an organic binder, to form a mixture, the one or more inorganic components comprising a primary phase material being zeolite, or CeO2—ZrO2, or a combination; forming the mixture into a shaped body; firing the shaped body to allow the inorganic binder to bind the one or more inorganic components; impregnating the shaped body with a source of a reducing or oxidizing element; and heating the impregnated shaped body to form a redox oxide from the source, the redox oxide being supported by the shaped body.
摘要:
Zeolite-based honeycomb bodies and methods of manufacturing same. Zeolite-based honeycomb bodies especially suited for engine exhaust treatment applications include a primary phase comprising a zeolite having a SiO2 to Al2O3 molar ratio in the range from 5 to 300. The zeolite-based composites are porous with an open porosity of at least 25% and a median pore diameter of at least 1 micron. The zeolite-based honeycomb bodies can be manufactured by an extrusion method.
摘要翻译:沸石类蜂窝体及其制造方法。 特别适用于发动机排气处理应用的沸石类蜂窝体包括:主相,其包含SiO 2与Al 2 O 3摩尔比在5至300范围内的沸石。沸石基复合材料是多孔的,孔隙率至少为25% 中值孔径至少为1微米。 沸石类蜂窝体可以通过挤出法制造。