acase@tulane.edu

acase@tulane.edu

The kinetics of electrochemical H$\sb2$ evolution and glucose reduction (to sorbitol) on powdered Raney nickel catalyst was investigated in a batch slurry reactor. Electro-generation of hydrogen on the nickel catalyst was found to proceed via a Volmer-Heyrovsky mechanism. The H$\sb2$ evolution kinetic parameters were determined as a function of electrolyte pH (7.0-14.7) and temperature (298-328 K) by performing potential sweep experiments in the slurry reactor. During glucose electro-hydrogenation, the Volmer and Heyrovsky steps for H$\sb2$ evolution were found to occur in conjunction with a chemical catalytic reaction between adsorbed atomic H and organic substrate in solution. A kinetic model was formulated to predict electric current and glucose reduction rate at a given cathodic overpotential. The model included rate equations for the individual reaction steps and Langmuir adsorption isotherm for glucose along with equations for the Raney Ni open circuit potential shift due to glucose adsorption, steady-state atomic H balance and charge balance at the electrode/electrolyte interface. The theoretical predictions were in excellent agreement with experimental potential sweep data (with an average error of 8-10%) and the computed sorbitol production rates were within 8-15% of constant potential electrolyses in the batch reactor A computer model was developed to simulate electrocatalytic hydrogenation of glucose in a flow reactor containing a packed bed Raney nickel powder cathode. The mathematical formulation included the relevant equations describing the transport of reactants and products, conservation of species electroneutrality, and Ohm's law in solution. The model also contained the kinetic rate equations for H$\sb2$ evolution and glucose reduction which were obtained from the batch slurry reactor studies. The flow reactor model was solved in one-dimension with no adjustable parameters to predict sorbitol production rates and current efficiencies. The simulation results reproduced accurately (with an average error of 9%) constant current electrolyses data in the literature at a reactor temperature of 333 K with glucose feed concentration ranging from 0.4 M to 1.6 M and applied current density in the range 0.005-0.021 A/cm$\sp2.$ The model predictions indicated that sorbitol production rates and current efficiencies can be maximized by operating the flow reactor at the highest glucose feed concentration and temperature possible and by pulsing the applied current (in either ON-OFF or ON-ON mode) to the reactor / acase@tulane.edu

acase@tulane.edu

acase@tulane.edu

acase@tulane.edu

John Fletcher's last tragicomedy, A Wife for a Moneth (1624), has suffered unmerited neglect since the end of the seventeenth century. Although it is not unflawed, this play is a striking example of the playwright's unique tragicomic style. The play is included in the various eighteenth, nineteenth, and early twentieth century Beaumont and Fletcher collection, each of which is based mainly upon the text of the Second Folio (Fifty Comedies and Tragedies, 1679). With the exception of the Glover and Waller edition of 1907, which is little more than a reprint of the Second Folio text, all previous editions display the eclecticism characteristic of eigtheenth and nineteenth century editing. This old-spelling, critical edition, based on the authoritative text of the First Folio (Comedies and Tragedies, 1647), meets the need for a reliable text; it not only draws attention to this fine play, but also provides insight into John Fletcher's art in his more widely appreciated plays The Introduction to this edition begins with a discussion of the authorship of the play. John Fletcher's sole authorship has never been questioned. Nevertheless, a brief review of contemporary attribution and of linguistic and stylistic characteristics which support the assertion of Fletcher's authorship provides a foundation for the rest of the discussion. A review of various suggestions of sources for the play follows, leading to the conclusion that in most cases Fletcher drew on his potential sources only in the most general way Sections on Stage History and The Text document the rather few performances of this play and its history in print. The latter section also presents the rationale for selection of the First Folio as the copy text, and documents my extensive collation of copies of the First Folio text of A Wife for a Moneth In order to provide the reader with a sufficient sense of the intellectual milieu of the play, the Introduction also examines Fletcher's presentation of the themes of Absolute Monarchy, Melancholy, and Honor. This examination prepares for a consideration of the play as an example of the author's unique tragicomic style. The themes are less important in themselves than in the theatrical effects which they help to achieve. Fletcher's genius as an author of tragicomedy lies in his ability to produce certain effects: a series of startling events, rapid shifts of emotion, and a denouement which, while completely surprising, is well prepared-for in the course of the play. A Wife for a Moneth provides an excellent illustration of Fletcher's art The edition itself follows the dicta of W. W. Greg and Fredson Bowers, insofar as it preserves the significant accidentals of the copy text. In general, aside from the correction of obvious printing errors, the only emendations are those required to preserve the clarity of expression. The running commentary on the text provides the reader with insight into the linguistic, literary, and cultural background of the play / acase@tulane.edu

acase@tulane.edu

acase@tulane.edu

acase@tulane.edu