An alkali-promoted ruthenium catalyst for the synthesis of ammonia, supported on thermally modified active carbon
Ruthenium catalysts deposited on active carbon and pre-calcined at 1900°C in He atmosphere were studied. The precursors of the active phase were RuCl3·0.5H2O and Ru3(CO)12. Potassium and cesium (hydroxides or nitrates) were used as promoters. The catalysts were characterized by TEM, WAXS and H2 chem...
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| Veröffentlicht in: | Catalysis letters 1997-01, Vol.45 (1-2), p.65-72 |
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| creator | KOWALCZYK, Z SENTEK, J JODZIS, S MIZERA, E GORALSKI, J PARYJCZAK, T DIDUSZKO, R |
| description | Ruthenium catalysts deposited on active carbon and pre-calcined at 1900°C in He atmosphere were studied. The precursors of the active phase were RuCl3·0.5H2O and Ru3(CO)12. Potassium and cesium (hydroxides or nitrates) were used as promoters. The catalysts were characterized by TEM, WAXS and H2 chemisorption. Activity measurements in NH3 synthesis were performed in a flow integral reactor under a pressure of 10 MPa at 470, 430, and 400°C (H2:N2=3:1). It has been found that the alkali-promoted catalyst deposited on the thermally modified carbon is much more active than that based on untreated carbon. The form of the Ru precursor used in the manufacture of the K-promoted catalyst had no effect on its dispersion or activity. The promoting effect of potassium was comparable to that of cesium. A monotonous increase in the activity of alkali-promoted catalyst vs. Ru content (5--15%) was observed, accompanied by a decrease in dispersion. |
| doi_str_mv | 10.1023/a:1018970318628 |
| format | Article |
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The precursors of the active phase were RuCl3·0.5H2O and Ru3(CO)12. Potassium and cesium (hydroxides or nitrates) were used as promoters. The catalysts were characterized by TEM, WAXS and H2 chemisorption. Activity measurements in NH3 synthesis were performed in a flow integral reactor under a pressure of 10 MPa at 470, 430, and 400°C (H2:N2=3:1). It has been found that the alkali-promoted catalyst deposited on the thermally modified carbon is much more active than that based on untreated carbon. The form of the Ru precursor used in the manufacture of the K-promoted catalyst had no effect on its dispersion or activity. The promoting effect of potassium was comparable to that of cesium. A monotonous increase in the activity of alkali-promoted catalyst vs. Ru content (5--15%) was observed, accompanied by a decrease in dispersion.</description><identifier>ISSN: 1011-372X</identifier><identifier>EISSN: 1572-879X</identifier><identifier>DOI: 10.1023/a:1018970318628</identifier><language>eng</language><publisher>Dordrecht: Springer</publisher><subject>Activated carbon ; Ammonia ; Carbon ; Catalysis ; Catalysts ; Catalysts: preparations and properties ; Cesium ; Chemical activity ; Chemical synthesis ; Chemisorption ; Chemistry ; Dispersion ; Exact sciences and technology ; General and physical chemistry ; Hydroxides ; Organic chemistry ; Potassium ; Precursors ; Ruthenium trichloride ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><ispartof>Catalysis letters, 1997-01, Vol.45 (1-2), p.65-72</ispartof><rights>1997 INIST-CNRS</rights><rights>Catalysis Letters is a copyright of Springer, (1997). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c256t-43d00789704c72731972561edd2167a93b2b8b2d37a56b6f3ff6f95b6f0db6f73</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,27928,27929</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2704693$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>KOWALCZYK, Z</creatorcontrib><creatorcontrib>SENTEK, J</creatorcontrib><creatorcontrib>JODZIS, S</creatorcontrib><creatorcontrib>MIZERA, E</creatorcontrib><creatorcontrib>GORALSKI, J</creatorcontrib><creatorcontrib>PARYJCZAK, T</creatorcontrib><creatorcontrib>DIDUSZKO, R</creatorcontrib><title>An alkali-promoted ruthenium catalyst for the synthesis of ammonia, supported on thermally modified active carbon</title><title>Catalysis letters</title><description>Ruthenium catalysts deposited on active carbon and pre-calcined at 1900°C in He atmosphere were studied. The precursors of the active phase were RuCl3·0.5H2O and Ru3(CO)12. Potassium and cesium (hydroxides or nitrates) were used as promoters. The catalysts were characterized by TEM, WAXS and H2 chemisorption. Activity measurements in NH3 synthesis were performed in a flow integral reactor under a pressure of 10 MPa at 470, 430, and 400°C (H2:N2=3:1). It has been found that the alkali-promoted catalyst deposited on the thermally modified carbon is much more active than that based on untreated carbon. The form of the Ru precursor used in the manufacture of the K-promoted catalyst had no effect on its dispersion or activity. The promoting effect of potassium was comparable to that of cesium. A monotonous increase in the activity of alkali-promoted catalyst vs. Ru content (5--15%) was observed, accompanied by a decrease in dispersion.</description><subject>Activated carbon</subject><subject>Ammonia</subject><subject>Carbon</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Catalysts: preparations and properties</subject><subject>Cesium</subject><subject>Chemical activity</subject><subject>Chemical synthesis</subject><subject>Chemisorption</subject><subject>Chemistry</subject><subject>Dispersion</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Hydroxides</subject><subject>Organic chemistry</subject><subject>Potassium</subject><subject>Precursors</subject><subject>Ruthenium trichloride</subject><subject>Theory of reactions, general kinetics. Catalysis. 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The precursors of the active phase were RuCl3·0.5H2O and Ru3(CO)12. Potassium and cesium (hydroxides or nitrates) were used as promoters. The catalysts were characterized by TEM, WAXS and H2 chemisorption. Activity measurements in NH3 synthesis were performed in a flow integral reactor under a pressure of 10 MPa at 470, 430, and 400°C (H2:N2=3:1). It has been found that the alkali-promoted catalyst deposited on the thermally modified carbon is much more active than that based on untreated carbon. The form of the Ru precursor used in the manufacture of the K-promoted catalyst had no effect on its dispersion or activity. The promoting effect of potassium was comparable to that of cesium. A monotonous increase in the activity of alkali-promoted catalyst vs. Ru content (5--15%) was observed, accompanied by a decrease in dispersion.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1023/a:1018970318628</doi><tpages>8</tpages></addata></record> |
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| identifier | ISSN: 1011-372X |
| ispartof | Catalysis letters, 1997-01, Vol.45 (1-2), p.65-72 |
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| language | eng |
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| source | SpringerNature Journals |
| subjects | Activated carbon Ammonia Carbon Catalysis Catalysts Catalysts: preparations and properties Cesium Chemical activity Chemical synthesis Chemisorption Chemistry Dispersion Exact sciences and technology General and physical chemistry Hydroxides Organic chemistry Potassium Precursors Ruthenium trichloride Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | An alkali-promoted ruthenium catalyst for the synthesis of ammonia, supported on thermally modified active carbon |
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