Metal-Substituted Microporous Aluminophosphates

This chapter aims to present the zeotypes aluminophosphates (AlPOs) as a complementary alternative to zeolites in the isomorphic incorporation of metal ions within all-inorganic microporous frameworks as well as to discuss didactically the catalytic consequences derived from the distinctive features of both frameworks. It does not intend to be a compilation of either all or the most significant publications involving metal-substituted microporous aluminophosphates. Families of AlPOs and zeolites, which include metal ion-substituted variants, are the dominant microporous materials. Both these systems are widely used as catalysts, in particular through aliovalent metal ions substitution. Here, some general description of the synthesis procedures and characterization techniques of the MeAPOs (metal-contained aluminophosphates) is given along with catalytic properties. Next, some illustrative examples of the catalytic possibilities of MeAPOs as catalysts in the transformation of the organic molecules are given. The oxidation of the hardly activated hydrocarbons has probably been the most successful use of AlPOs doped with the divalent transition metal ions Co2+, Mn2+, and Fe2+, whose incorporation in zeolites is disfavoured. The catalytic role of these MeAPOs is rationalized based on the knowledge acquired from a combination of the most advanced characterization techniques. Finally, the importance of the high specificity of the structure-directing agents employed in the preparation of MeAPOs is discussed taking N,N-methyldicyclohexylamine in the synthesis of AFI-structured materials as a driving force. It is shown how such a high specificity could be predicted and how it can open great possibilities in the control of parameters as critical in catalysis as crystal size, inter-and intracrystalline mesoporosity, acidity, redox properties, incorporation of a great variety of heteroatom ions or final environment of the metal site (surrounding it by either P or Al)

Adapted lean thinking for healthcare services: an empirical study in the traditional Chinese hospital

This paper looks at how Lean Thinking can be adapted using a model derived from a case study of a large Traditional Chinese Hospital. After a restructuring in divisions and the implementation of the care programmers and clinical pathways, hospital management found that they had no tools to evaluate if these changes were resulting in a Lean Thinking approach on the work-floor. In agreement with hospital management, an existing tool of Business Process Reengineering measurement was adopted and adapted to the specific context of healthcare. This paper reports on how the quantitative model was changed and validated in order to come up with a useful instrument to measure the Lean Thinking of the employees in the hospital. The Hospital Lean Thinking (HLT) tool can be useful to measure the effects of changes that are assumed to lead to more Lean Thinking or even patient focus. In this way the pay-off of these investments can be made more tangible. The HLT tool offers hospitals a way to evaluate how they are evolving towards more Lean Thinking