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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Process Safety Progress 16 (1997), S. 23-24 
    ISSN: 1066-8527
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Large scale centralized manufacture of chemicals coupled with distribution to remote customers has obvious economic advantages derived from economy of scale. In some cases, however, concern for safety and environment can drive a search for competitive small scale processes for production of toxic chemicals at the end-use site, thereby eliminating the potential hazards associated with transportation. We will present a case study in which novel technology is being explored to develop a safe, economically attractive process with minimal waste for the synthesis of hydrogen cyanide.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: Rhodium ; silica ; catalyst microstructure ; disruption ; carbon monoxide ; nitric oxide ; model catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Initially reduced ≈ 100 Å diameter Rh metal particles on SiO2 are found by TEM to be dispersed into an amorphous metal film by treatment in 5% NO + 5% CO in He at 260 °C, leaving thin rings around the perimeter of the original particles. Electron diffraction shows that Rh is amorphous while XPS shows that the Rh is approximately zero valent in the dispersed state. Continued heating in this mixture resulted in irreversible volatilization of the Rh even at these low temperatures. Subsequent heating in H2 at 650 °C caused sintering and the reformation of crystalline Rh particles, but with a lower loading than observed initially. Treatment of Rh particles in 5% NO at 260 °C causes Rh particles to shrink in diameter and to form thin shells around their perimeters. The only change observed after treatment in 5% CO alone at 260 °C was slight sintering of adjacent Rh particles.
    Type of Medium: Electronic Resource
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