Background Brief Historical Overview

This is the introductory chapter which sets the stage for those that follow. We start by attempting the definition of the term free radical together with a very brief historical background. This is followed by brief overviews of some of the types of radical that might be encountered in biological systems. 

To address the need of various audiences to understand this Report at different levels of detail, the Report consists of three essentially self-contained parts a short Synopsis, an extended Technical Summary, and the main Report. The Synopsis presents a brief description of the proposed waste classification system, essentially in the form of an overview for legislators and other executive-level decision makers. The aim is to show that the system is simple in principle and concepts, and to illustrate its benefits. The Technical Summary (Section 1) presents an extended discussion of existing hazardous waste classification systems, difficulties with these systems, and the proposed classification system. The aim is to fully describe the proposed system and its rationale and benefits, but without much of the background information on technical and historical details that support the proposal. Many audiences may find that the Technical... 

What is presented is a brief overview of these issues, not a comprehensive discussion of the historical background and methodologies of the traditional... 

In a first part, we present a brief overview of the historical background of MTO, and then we describe the mechanisms existing in the Uterature. In a second phase, we will try to be critical of those results, understand the formation and the maximization of ethylene and propylene selectivities, as well as refine the existing concepts. 

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