Development of Vanadium-phosphate Catalysts for Methanol Production by Selective Oxidation of Methane. Quarterly Technical Progress Report 5, October--December, 1993 PDF Download
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Languages : en
Pages : 12
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During this quarter several runs directed at revealing the presence of transport limitations were conducted. Also, methanol oxidation over vanadyl pyrophosphate was studied in a series of tests that investigated the effects of pressure, temperature, and methanol:oxygen ratio. Work on the preparation of a silica supported catalyst continued and several promoted catalysts were prepared. These results are discussed in detail and plans for the coming quarter are outlined.
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Languages : en
Pages : 12
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During this quarter several runs directed at revealing the presence of transport limitations were conducted. Also, methanol oxidation over vanadyl pyrophosphate was studied in a series of tests that investigated the effects of pressure, temperature, and methanol:oxygen ratio. Work on the preparation of a silica supported catalyst continued and several promoted catalysts were prepared. These results are discussed in detail and plans for the coming quarter are outlined.
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Languages : en
Pages : 17
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This document is the fourth quarterly technical progress report under Contract No. DE-AC22-92PC92110, {open_quotes}Development of Vanadium-Phosphate Catalysts for Methanol Production by Selective Oxidation of Methane.{close_quotes} During this quarter, the authors focused primarily on catalyst activity testing in the microreactor. Additional blank runs using methane and methanol were performed. Initial attempts at preparing a silica supported catalyst are described. These results are discussed in detail and plans for the coming quarter are outlined.
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Languages : en
Pages : 17
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This document is the fifteenth quarterly technical progress report under Contract No. DE-AC22-92PC921 'Development of Vanadium- Phosphate Catalysts for Methanol Production by Selective Oxidation of Methane' and covers the period October-December, 1996. Vanadium phosphate, vanadyl pyrophosphate specifically, is used commercially to oxidize butane to maleic anhydride and is one of the few examples of an active and selective oxidation catalyst for alkanes. In this project we are examining this catalyst for the methane oxidation reaction. Initial process variable and kinetic studies indicated that vanadyl pyrophosphate is a reasonably active catalyst below 5000°C but produces CO as the primary product, no formaldehyde or methanol were observed. A number of approaches for modification of the phosphate catalyst to improve selectivity have been tried during this project. During this quarter we have obtained surface areas of catalysts prepared with modified surface acidity. The results confirm the enhanced activity of two of the modified preparations in methanol conversion (a test reaction for surface acid sites). In previous work we noted no improvement in methane oxidation selectivity for these catalysts. Surface areas, surface analysis by XPS, and bulk analysis by ICP-AA have been obtained for vanadyl pyrophosphate promoted by Cr, Cu, and Fe. These data indicate that roughly one tenth of the surface metal atoms are promoter. A similar analysis was obtained for the bulk. Preliminary examination of binding energies suggests a slightly more reduced surface for the Cr and Fe promoted catalysts which exhibit a significant selectivity to formaldehyde in methane oxidation. A more detailed kinetic model has also been developed to aid in comparing the promoted catalysts and is discussed. Plans for the coming months are outlined.
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Languages : en
Pages : 19
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This document is the third quarterly technical progress report under Contract No. AC22-92PC92110, ''Development of Vanadium-Phosphate Catalysts for Methanol Production by Selective Oxidation of Methane.'' During this quarter, we have continued to develop methods for catalyst activation by investigating activation in wet gas environments. This procedure leads to the formation of highly crystalline (VO)2P2O--, while activation under identical conditions, but with no moisture, leads to a poorly crystalline sample. Published data indicate that the highly crystalline form is representative of commercial butane oxidation catalysts. The main focus of our work during this quarter has been in the area of catalyst testing in the microreactor system. In order to confirm that our microreactor system was providing reliable data, we tested a V2O5/SiO2 catalyst at atmospheric pressure and temperatures from 500 to 600°C using 90 to 95 percent CH4/O2. Several studies of methane oxidation using this catalyst have been published with reasonably good agreement between different research groups. We were not able to reproduce the literature data using steel reactors. However, when the steel reactor was lined with quartz and the postcatalyst reactor volume was minimized by packing with quartz chips, we obtained results which agree closely with those previously published. Using the same quartz reactor and test conditions, we also tested a highly crystalline (wet activated) VPO catalyst.
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Languages : en
Pages : 18
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During the second quarter, we initiated Task 2 (Process and Catalyst Variable Study). This task involves an investigation of methods for vanadium phosphate (VPO) catalyst synthesis and activation as well as detailed testing of the catalysts produced for activity and selectivity in methane selective oxidation. As we initiated work on Task 2, three problem areas were identified: Preparation of catalysts with P:V ratio greater than 1. Activation of the precursor to produce the B-phase described in the patent literature. Achieving high (>95 percent) carbon balances in the bench-scale test unit. Each of these problems has been addressed and overcome during this quarter. Several catalysts with P:V ratios ranging from 0.95 to 1.1 have been prepared. Activation procedures are continuing to be investigated. We have found several procedures which yield catalysts having the desired X-ray diffraction pattern. The reactor system was modified and analytical procedures improved so that in a 7-day run using V2O5 as the catalyst, carbon balances ranged from 95 to 105 percent.
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Category : Power resources
Languages : en
Pages : 782
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Pages : 23
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Amax R & D will perform laboratory scale development of a promising, practical catalyst for the selective oxidation of methane to methanol. The primary component of this catalyst is vanadium-phosphate (VPO) which has shown good activity and selectivity in the partial oxidation of n-butane and propane but has not been studied in detail for methane oxidation. The goal of the project is to develop a catalyst which allows methane oxidation to methanol to be conducted at high conversion and selectivity. A low CH4/O2 ratio will be employed with air as the source of oxygen. Temperatures below 600°C and pressures up to 20 atm are to be investigated. The use of steam in the feed gas will also be investigated. The catalyst development strategy will be to utilize promoters and supports to improve the activity and selectivity of the unmodified VPO catalyst. The catalyst testing reactor system was used to perform blank (empty) reactor runs over a wide range of temperatures, pressure, and flow rates. No methane conversion was observed at temperatures of 500°C or lower in any of the tests. At higher temperatures, significant methane conversion to carbon dioxide was observed. At 550°C, 300 psig, and the highest flow rate studied, reactor ignition was observed. Based on the results of these blank runs, we conclude that catalyst testing should be performed at temperatures not to exceed 500°C.
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Languages : en
Pages : 94
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Martin Huber, son of Henry Huber and Maria Wenger, married Annie Wenger (b. 1799). They had four children. After Martin's death, Annie married John Gayman. They had five children. They lived in Pennsylvania. Includes Bricker, Thrush and related families.
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