High pressure ammonia decomposition on Ru-K/CaO catalysts
Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. At an optimum Ru loading of 3% wt, catalysts with a K/Ru atomic ratio of 0.9 showed the best catalytic performance under a wide range of oper...
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| Veröffentlicht in: | Catalysis science & technology 2020-08, Vol.1 (15), p.527-535 |
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| creator | Sayas, Salvador Morlanés, Natalia Katikaneni, Sai P Harale, Aadesh Solami, Bandar Gascon, Jorge |
| description | Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. At an optimum Ru loading of 3% wt, catalysts with a K/Ru atomic ratio of 0.9 showed the best catalytic performance under a wide range of operating conditions,
P
= 1-40 bar,
T
= 250-550 °C and WHSV = 9000-30 000 mL g
−1
h
−1
. Although NH
3
conversion levels decrease considerably upon increasing the reaction pressure (
X
550 °C, 40 bar
= 0.8), high pressure ammonia decomposition offers the possibility of CO
x
-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.
Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. |
| doi_str_mv | 10.1039/d0cy00686f |
| format | Article |
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P
= 1-40 bar,
T
= 250-550 °C and WHSV = 9000-30 000 mL g
−1
h
−1
. Although NH
3
conversion levels decrease considerably upon increasing the reaction pressure (
X
550 °C, 40 bar
= 0.8), high pressure ammonia decomposition offers the possibility of CO
x
-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.
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P
= 1-40 bar,
T
= 250-550 °C and WHSV = 9000-30 000 mL g
−1
h
−1
. Although NH
3
conversion levels decrease considerably upon increasing the reaction pressure (
X
550 °C, 40 bar
= 0.8), high pressure ammonia decomposition offers the possibility of CO
x
-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.
Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids.</description><subject>Ammonia</subject><subject>Catalysts</subject><subject>Chemisorption</subject><subject>Decomposition</subject><subject>Potassium</subject><subject>Ruthenium</subject><issn>2044-4753</issn><issn>2044-4761</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp90M9LwzAUB_AgCo65i3eh4k2oe_nRND1KdU4cDEQPnkKaH9qxLjVpD_3vrU7mzfAgD96H9-CL0DmGGwy0mBvQAwAX3B2hCQHGUpZzfHzoM3qKZjFuYHyswCDIBBXL-v0jaYONsQ82UU3jd7VKjNW-aX2su9rvkrGe-_RpXqp1olWntkPs4hk6cWob7ez3n6LXxf1LuUxX64fH8naVakZwl1JOtBC20qbiVGeac5ILURkiTKWIy0k-DnAlCiYcz41jGeQ2EwoKU2nHMzpFV_u9bfCfvY2d3Pg-7MaTkjAKlAIUYlTXe6WDjzFYJ9tQNyoMEoP8TkfeQfn2k85ixJd7HKI-uL_0ZGvcaC7-M_QLRGRreQ</recordid><startdate>20200805</startdate><enddate>20200805</enddate><creator>Sayas, Salvador</creator><creator>Morlanés, Natalia</creator><creator>Katikaneni, Sai P</creator><creator>Harale, Aadesh</creator><creator>Solami, Bandar</creator><creator>Gascon, Jorge</creator><general>Royal Society of Chemistry</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0001-7558-7123</orcidid></search><sort><creationdate>20200805</creationdate><title>High pressure ammonia decomposition on Ru-K/CaO catalysts</title><author>Sayas, Salvador ; Morlanés, Natalia ; Katikaneni, Sai P ; Harale, Aadesh ; Solami, Bandar ; Gascon, Jorge</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c421t-362c88ebcdb63c5c662788bd28dba2f727db61b8948f67df4507e58a09dbcf653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Ammonia</topic><topic>Catalysts</topic><topic>Chemisorption</topic><topic>Decomposition</topic><topic>Potassium</topic><topic>Ruthenium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sayas, Salvador</creatorcontrib><creatorcontrib>Morlanés, Natalia</creatorcontrib><creatorcontrib>Katikaneni, Sai P</creatorcontrib><creatorcontrib>Harale, Aadesh</creatorcontrib><creatorcontrib>Solami, Bandar</creatorcontrib><creatorcontrib>Gascon, Jorge</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Catalysis science & technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sayas, Salvador</au><au>Morlanés, Natalia</au><au>Katikaneni, Sai P</au><au>Harale, Aadesh</au><au>Solami, Bandar</au><au>Gascon, Jorge</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High pressure ammonia decomposition on Ru-K/CaO catalysts</atitle><jtitle>Catalysis science & technology</jtitle><date>2020-08-05</date><risdate>2020</risdate><volume>1</volume><issue>15</issue><spage>527</spage><epage>535</epage><pages>527-535</pages><issn>2044-4753</issn><eissn>2044-4761</eissn><abstract>Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. At an optimum Ru loading of 3% wt, catalysts with a K/Ru atomic ratio of 0.9 showed the best catalytic performance under a wide range of operating conditions,
P
= 1-40 bar,
T
= 250-550 °C and WHSV = 9000-30 000 mL g
−1
h
−1
. Although NH
3
conversion levels decrease considerably upon increasing the reaction pressure (
X
550 °C, 40 bar
= 0.8), high pressure ammonia decomposition offers the possibility of CO
x
-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.
Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/d0cy00686f</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-7558-7123</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Catalysis science & technology, 2020-08, Vol.1 (15), p.527-535 |
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| language | eng |
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| source | Royal Society Of Chemistry Journals 2008- |
| subjects | Ammonia Catalysts Chemisorption Decomposition Potassium Ruthenium |
| title | High pressure ammonia decomposition on Ru-K/CaO catalysts |
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