Compaction versus Surface Parameters of Certain Solid Catalysts
The effect of compaction at 0.31–3.1 t/cm 2 on Al(OH) 3 , Mg(OH) 2 and their mixed hydroxide was studied by nitrogen adsorption. With Al(OH) 3 , compaction gave no significant changes up to 1.24 t/cm 2 , but above 1.55 t/cm 2 a considerable decrease in S BET and an increase in pore radius occurred w...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
1997-04-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361749701500407 |
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| _version_ | 1832544607752159232 |
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| author | Anwar Amin Laila I. Ali Anwar M. Ibrahim |
| author_facet | Anwar Amin Laila I. Ali Anwar M. Ibrahim |
| author_sort | Anwar Amin |
| collection | DOAJ |
| description | The effect of compaction at 0.31–3.1 t/cm 2 on Al(OH) 3 , Mg(OH) 2 and their mixed hydroxide was studied by nitrogen adsorption. With Al(OH) 3 , compaction gave no significant changes up to 1.24 t/cm 2 , but above 1.55 t/cm 2 a considerable decrease in S BET and an increase in pore radius occurred with small changes in pore volume. This could be ascribed to the presence of free water between the structural layers in the material which normally prevents their contact and a consequent destruction of the pore structure. With Mg(OH) 2 , compaction at low pressures decreased S BET and increased the pore dimensions as a result of adhesion between neighbouring particles, leading to a blocking of that fraction of the micropore structure originally accessible to nitrogen molecules. Increasing compaction led to a marked increase in the adsorption capacity as a consequence of plastic deformation associated with the breakage of fragile primary particles and the creation of new surfaces. Compaction of the mixed hydroxide led at first to an increase in both the S BET and V p values (due to fragmentation of the particles), followed by a loss of S BET due to the presence of a mixture of particles in the system which increase the compression ability of the latter. Complete pore structure analysis showed that samples of Al(OH) 3 powder when compacted at 0.31 and 1.55 t/cm 2 were microporous. All other samples contained mainly mesopores. |
| format | Article |
| id | doaj-art-40022c5fb1fe47e7b51691515004bbe2 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 1997-04-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-40022c5fb1fe47e7b51691515004bbe22025-02-03T10:07:40ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40381997-04-011510.1177/026361749701500407Compaction versus Surface Parameters of Certain Solid CatalystsAnwar AminLaila I. AliAnwar M. IbrahimThe effect of compaction at 0.31–3.1 t/cm 2 on Al(OH) 3 , Mg(OH) 2 and their mixed hydroxide was studied by nitrogen adsorption. With Al(OH) 3 , compaction gave no significant changes up to 1.24 t/cm 2 , but above 1.55 t/cm 2 a considerable decrease in S BET and an increase in pore radius occurred with small changes in pore volume. This could be ascribed to the presence of free water between the structural layers in the material which normally prevents their contact and a consequent destruction of the pore structure. With Mg(OH) 2 , compaction at low pressures decreased S BET and increased the pore dimensions as a result of adhesion between neighbouring particles, leading to a blocking of that fraction of the micropore structure originally accessible to nitrogen molecules. Increasing compaction led to a marked increase in the adsorption capacity as a consequence of plastic deformation associated with the breakage of fragile primary particles and the creation of new surfaces. Compaction of the mixed hydroxide led at first to an increase in both the S BET and V p values (due to fragmentation of the particles), followed by a loss of S BET due to the presence of a mixture of particles in the system which increase the compression ability of the latter. Complete pore structure analysis showed that samples of Al(OH) 3 powder when compacted at 0.31 and 1.55 t/cm 2 were microporous. All other samples contained mainly mesopores.https://doi.org/10.1177/026361749701500407 |
| spellingShingle | Anwar Amin Laila I. Ali Anwar M. Ibrahim Compaction versus Surface Parameters of Certain Solid Catalysts Adsorption Science & Technology |
| title | Compaction versus Surface Parameters of Certain Solid Catalysts |
| title_full | Compaction versus Surface Parameters of Certain Solid Catalysts |
| title_fullStr | Compaction versus Surface Parameters of Certain Solid Catalysts |
| title_full_unstemmed | Compaction versus Surface Parameters of Certain Solid Catalysts |
| title_short | Compaction versus Surface Parameters of Certain Solid Catalysts |
| title_sort | compaction versus surface parameters of certain solid catalysts |
| url | https://doi.org/10.1177/026361749701500407 |
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