Reactions Between Vapor Phase Lead Compounds and In Situ Generated Silica Particles at Various Lead-Silicon Feed Ratios: Applications to Toxic Metal Capture in Combustors

Timothy M. Owens, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

A detailed characterization was performed of the particles produced under various Pb:Si molar feed ratios for a maximum flow reactor temperature of 1000 °C. The silica particles formed in the high temperature region coagulated and only partially coalesced to form large agglomerate structures of high specific surface area. For a lead-only feed, the resulting particles were hydrocerussite with small but detectable amounts of massicot. As the silica precursor was inlet in excess amounts (Pb:Si < 1:12, the crystalline lead compounds disappeared and amorphous lead-silica complexes dominated. The particle morphology also changed from cylindrical, polygonal, and spherical shapes to large agglomerate structures composed of several size modes of primary particles. At Pb:Si molar feed ratios of 1:12 and 1:29, the particles making up the chainlike agglomerate structure were primarily spherical, with larger lead silicate spherical particles (=0.5 μm) attached to the agglomerate. The lead was found to be distributed throughout the large agglomerate structures, implying easier capture of lead emissions in particulate control devices.

Original languageEnglish (US)
Pages (from-to)530-538
Number of pages9
JournalJournal of the Air and Waste Management Association
Volume46
Issue number6
DOIs
StatePublished - Jun 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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