Abstract: Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described.

Abstract: Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described.

Abstract: Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described.

Abstract: Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described.

Abstract: An emission treatment system and method for remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams are described. The emission treatment system has an oxidation catalyst upstream of a soot filter upstream from a NOx reducing catalyst.

Abstract: Described are SCR catalyst systems comprising a first SCR catalyst composition and a second SCR catalyst composition arranged in the system, the first SCR catalyst composition having a faster DeNOx response time when exposed to ammonia than the second catalyst composition and the second SCR catalyst composition has a higher steady state DeNOx performance than the first catalyst composition. The SCR catalyst systems are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Abstract: Described are SCR catalyst systems comprising a first SCR catalyst composition and a second SCR catalyst composition arranged in the system, the first SCR catalyst composition having a faster DeNOx response time when exposed to ammonia than the second catalyst composition and the second SCR catalyst composition has a higher steady state DeNOx performance than the first catalyst composition. The SCR catalyst systems are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Abstract: Exhaust treatment filters, systems, and methods are disclosed. According to one or more embodiments, a particulate filter is zone coated with an oxidation catalyst and is used in an emission treatment system or method including a NOx reducing catalyst and an optional NH3 destruction catalyst.

Abstract: Described are catalysts for the hydrogenation, hydroisomerisation, hydrocracking and/or hydrodesulfurisation, of hydrocarbon feedstocks, the catalysts comprising a substantially binder free bead type support material comprising 5 to 60 wt. % of at least one crystalline molecular sieve material and 40 to 95 wt. % of non-crystalline, non-zeolitic silica-alumina and a catalytically active component comprising precious metals. Also described are methods for making catalyst supports by the dropwise addition of an aqueous sol of inorganic salts of aluminum and silicon, having dispersed therein the crystalline molecular sieve material, through an oil-phase to a water phase, thus providing homogeneous beads that are obtained without a separate shape-forming step.

Abstract: A catalyst for the hydrogenation, hydroisomerisation, hydrocracking and/or hydrodesulfurisation, of hydrocarbon feedstocks, the catalyst consisting of a substantially binder free bead type support material obtained through a sol-gel method, and a catalytically active component selected from precious metals, the support comprising 5 to 50 wt. % of at least one molecular sieve material and 50 to 95 wt. % of silica-alumina.

Abstract: A composition for promoting the oxidation of CO and minimizing NOx emissions during FCC processes comprises (i) acidic oxide support, (ii) at least one precious metal for promoting CO oxidation, and (iii) metals or metal oxides capable of reducing NOx production during CO oxidation, at least one precious metal (ii) being primarily distributed in the central interior of particulate additive and the metals or metal oxides (iii) being primarily distributed in the particulate additive as a shell around the precious metal.

Abstract: Zoned diesel oxidation catalysts containing a higher precious metal loading in the inlet zone that the outlet zone and an equal or shorter length inlet zone are described. Emission treatment systems and methods of remediating nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons using zoned diesel oxidation catalysts are also described.

Abstract: An emission treatment system and associated method for treating an exhaust stream containing nitrogen oxides and particulate matter are disclosed. One embodiment of the system comprises a flow-through oxidation catalyst, a reductant injector downstream from the oxidation catalyst, a particulate filter downstream from the reductant injector, an SCR catalyst downstream from the particulate filter and an ammonia oxidation catalyst downstream from the SCR catalyst. An embodiment of the method comprises passing the exhaust gas stream through the oxidation catalyst, injecting a reductant into the exhaust gas stream, passing the exhaust gas stream through the particulate filter, passing the exhaust gas stream through an SCR catalyst, and passing the exhaust gas stream through an ammonia oxidation catalyst.

Abstract: An emission treatment system and method for remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams are described. The emission treatment system has an oxidation catalyst upstream of a soot filter upstream from a NOx reducing catalyst.

Abstract: The invention is directed to a process for hydroprocessing of hydrocarbon feedstock containing sulfur and/or nitrogen contaminants, said process comprising first contacting the hydrocarbon feedstock with hydrogen in the presence of at least one first group VIII metal on a first acidic support catalyst, and thereafter contacting the feedstock with hydrogen in the presence of at least one second group VIII metal catalyst on a less acidic support.

Abstract: Exhaust treatment filters, systems, and methods are disclosed. According to one or more embodiments, a particulate filter is zone coated with an oxidation catalyst and is used in an emission treatment system or method including a NOx reducing catalyst and an optional NH3 destruction catalyst.

Abstract: Exhaust treatment filters, systems, and methods are disclosed. According to one or more embodiments, a particulate filter is zone coated with an oxidation catalyst and is used in an emission treatment system or method including a NOx reducing catalyst and an optional NH3 destruction catalyst.

Abstract: A composition for promoting the oxidation of CO and minimizing NOx emissions during FCC processes comprises (i) acidic oxide support, (ii) at least one precious metal for promoting CO oxidation, and (iii) metals or metal oxides capable of reducing NOx production during CO oxidation, at least one precious metal (ii) being primarily distributed in the central interior of particulate additive and the metals or metal oxides (iii) being primarily distributed in the particulate additive as a shell around the precious metal.

Abstract: A composition for controlling CO and NOx emissions during FCC processes comprises (i) acidic oxide support, (ii) cerium oxide, (iii) lanthanide oxide other than ceria such as praseodymium oxide (iv), optionally, oxide of a metal from Groups Ib and IIb such as copper, silver and zinc and (v) precious metal such as Pt and Pd.

Abstract: The invention is directed to a process for hydroprocessing of hydrocarbon feedstock containing sulfur and/or nitrogen contaminants, said process comprising first contacting the hydrocarbon feedstock with hydrogen in the presence of at least one first group VIII metal on a first acidic support catalyst, and thereafter contacting the feedstock with hydrogen in the presence of at least one second group VIII metal catalyst on a less acidic support.