Lee Y.-J.,Seoul National University of Science and Technology |
Koo B.-R.,Seoul National University of Science and Technology |
Baek S.-H.,Daegu Gyeongbuk Institute of Science and Technology |
Park M.-H.,Alantum |
Ahn H.-J.,Seoul National University of Science and Technology
Korean Journal of Materials Research | Year: 2015
NiO catalysts/Al2O3/FeCrAl alloy foam for hydrogen production was prepared using atomic layer deposition (ALD) and subsequent dip-coating methods. FeCrAl alloy foam and Al2O3 inter-layer were used as catalyst supports. To improve the dispersion and stability of NiO catalysts, an Al2O3 inter-layer was introduced and their thickness was systematically controlled to 0, 20, 50 and 80 nm using an ALD technique. The structural, chemical bonding and morphological properties (including dispersion) of the NiO catalysts/Al2O3/FeCrAl alloy foam were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy and scanning electron microscopy-energy dispersive spectroscopy. In particular, to evaluate the stability of the NiO catalysts grown on Al2O3/FeCrAl alloy foam, chronoamperometry tests were performed and then the ingredient amounts of electrolytes were analyzed via inductively coupled plasma spectrometer. We found that the introduction of Al2O3 inter-layer improved the dispersion and stability of the NiO catalysts on the supports. Thus, when an Al2O3 inter-layer with a 80 nm thickness was grown between the FeCrAl alloy foam and the NiO catalysts, it indicated improved dispersion and stability of the NiO catalysts compared to the other samples. The performance improvement can be explained by optimum thickness of Al2O3 inter-layer resulting from the role of a passivation layer. © 2015 Materials Research Society of Korea. Source
Alantum | Date: 2014-05-21
Common metals and their alloys, namely, nickel, iron, aluminum, and chromium; Metallic substrates, namely, uncoated alloy foam; Common metals and their alloys, namely, nickel, iron, aluminum, and chromium used in the manufacture of exhaust aftertreatment systems consisting; Metal foams coated with catalytic materials for use in exhaust aftertreatment systems. Exhaust gas catalytic converters and parts thereof; Exhaust aftertreatment systems consisting of a Diesel Particulate Filter (DPF), Diesel Oxidization Catalyst (DOC), Selective Catalytic Reduction (SCR), or combined systems, for motors and engines. Treatment of materials, particularly catalytic treatment of metal substrates. Engineering consulting services; Engineering consulting services in the field of exhaust gas catalytic converters and materials used therefor.
Alantum | Date: 2010-12-03
Provided is an exhaust gas filter, including: an external case connected with an exhaust pipe; a filtering unit provided in the external case; a filtering path supplying exhaust gas to the filtering unit; and a pressure relief flange provided in the external case to discharge exhaust gas by bypassing the filtering unit. According to an exemplary embodiment of the present invention, an exhaust gas filter can prevent the exhaust gas filter from being broken by circuitously discharging exhaust gas even when particular matters collected in the exhaust gas filter increase and thus, pressure in the exhaust gas filter excessively increases Further, engine components such as an EGR, a turbocharger, and the like can be prevented from being broken or outputs thereof can be prevented from deteriorating.
Alantum | Date: 2011-03-22
Disclosed is a method of manufacturing a porous metal foam cone assembly. The metal foam cone assembly according to the present invention includes providing a porous metal foam sheet; cutting the porous metal foam sheet to be in a predetermined shape using a cutting press that is provided with a knife tool; disposing the cut metal foam sheet on a base plate of a forming die and then primarily forming the metal foam sheet using a mandrel of a cone shape; secondarily forming the metal foam sheet using a left slider and a right slider of the forming die; and pressing an overlapping portion of the metal foam sheet using a stamping jig of the forming die after the forming using the left and right sliders.
Alantum | Date: 2012-07-24
A method of manufacturing a metal foam stack is provided. According to the present invention, the method includes: a metal foam sheet preparing step of preparing a plurality of metal foam sheets having a predetermined size and shape; a slurry application step of applying a slurry on a surface of the metal foam sheet; a metal foam stack forming step of forming the metal foam stack by stacking the metal foam sheets in a block form; a pressing force application step of applying pressing force having a predetermined magnitude to the metal foam stack; a pressing force removing step of removing pressing force applied to the metal foam stack after the pressing force application step is performed; and a heat treatment step of performing heat treatment of the metal foam stack to strongly attach the metal foam sheets to each other after pressing force applied to the metal foam stack is removed in the pressing force removing step.