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The Recovery of a Rhodium‐Containing Catalyst by Various New Silica‐Based Amine Ion Exchangers
Author(s) -
Kramer Jurjen,
Scholten Arjen,
Driessen Willem L.,
Reedijk Jan
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200206)2002:6<1488::aid-ejic1488>3.0.co;2-#
Subject(s) - chemistry , rhodium , catalysis , amine gas treating , ion exchange , ion , anion exchanger , polymer chemistry , inorganic chemistry , organic chemistry
Various mono‐, di‐, and triamine ligands have been successfully attached to an inert silica backbone. Their efficiency in the recovery of the model catalyst RhCl 3 has been thoroughly investigated. Correlation of the distribution coefficients for Rh 3+ as a function of the pH with recovery experiments, shows a subtle balance between the stability of the ligand‐to‐metal complexes and the elution efficiency. Rhodium ion exchanger complexes with log D values above 2.5 appear to be too stable to ensure a high (> 70%) desorption. A very high desorption (> 90%) has been effected with 2 M HNO 3 with ion exchangers containing monoamine ligands or sterically hindered diamine ligands. The adsorption medium appeared to be of major influence, both on the extractability and on the elution possibility.