Metal monolith for use in a reverse flow reactor
A technology of metals and metal alloys, applied in the direction of non-metal elements, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of low volume heat capacity and thermal conductivity, reduced production capacity, and reactors size increase etc.
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Embodiment 1
[0046] Example 1: Constructing Metal Monoliths
[0047] A 3D printed 1" long x 0.5" diameter metal monolith composed of Inconel 718 was constructed. Nominally, Inconel 718 alloy contains nickel (50-55%), chromium (17-21%), tantalum (up to 0.05%), manganese (up to 0.35%), carbon (up to 0.08%), silicon (up to 0.35%) , molybdenum (2.8-3.3%), niobium (4.75-5.5%), titanium (0.65-1.15%), cobalt (up to 1%), copper (up to 0.3%), phosphorus (up to 0.015%), sulfur (up to 0.015%) %), boron (up to 0.006%) and iron (balance). Such as figure 1 As shown, 400 cpsi and 800 cpsi (cells per square inch) were constructed via 3D printing. 3D printing is done by DMLS of Inconel718 powder. figure 2 A and figure 2 B shows that a large amount of surface area or roughness of the monolith wall is created due to the metal powder sintering process. External roughness and increased surface area can benefit the catalytic activity of 3D printed monoliths compared to monoliths with smoother channels...
Embodiment 2-17
[0048] Examples 2-17: Laboratory Evaluation of 3D Printed Monoliths
[0049] The performance of the 3D printed metal monolith constructed in Example 1 for methane reforming (steam reforming, dry reforming, and double reforming) was evaluated in a laboratory-scale fixed-bed downflow reactor. A 1" x 0.5" monolith was wrapped in high temperature alumina cloth to prevent bypass and loaded into a quartz reactor with an inlet diameter of approximately 0.6". Thermocouples were located just above the top of the metal monolith and just above the bottom. Below. The conversion of methane and carbon dioxide is determined by the disappearance of the reactants. Take the H in the product 2 and CO molar ratio to calculate the syngas ratio. All conversions for continuous flow experiments are reported after 1 hour of lineout. Continuous output refers to the time in flow required to obtain a constant conversion of reactants to products. In the following experiments, the continuous output wa...
Embodiment 2
[0050] Example 2 shows initial experiments on Monolith A (800 cpsi, synthesized from Inconel 718 metal powder as described in Example 1). At 10,000h based on the total volume of the monolith -1 The reforming of methane and water (steam reforming) is performed on the monolith at a gas hourly space velocity (GHSV) of . The reformed feed has 20 vol% CH 4 , 70% by volume of H 2 O and 10 vol% N 2 gas composition. At a temperature of 1000 °C, the monolith exhibited minimal catalytic activity, converting 15% of the methane to syngas ratio (H 2 / CO) was about 3.51 product. Some initial deactivation of the monolith was observed during the first 60 minutes of on-stream time, but the conversion was constant at 15% for 180 minutes after the initial inactivation.
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