RATIONAL DESIGN OF PLATINUM-IRON FISCHER-TROPSCH SYNTHESIS CATALYSTS : AN ACTIVITY-STRUCTURE RELATIONSHIPS STUDY

ISBN-13: 9783639161311 / Angielski / Miękka / 2009 / 152 str.

Jian Xu

Opis

Silica-supported iron catalysts were prepared using an advanced non-aqueous evaporative deposition technique, which leads to a catalyst with high extents of reduction, high CO conversions, and high C2+ hydrocarbons productivities. The catalysts were tested following an L18 orthogonal array statistical design approach. Primary independent variables affecting catalysts activity were promoter type, pretreatment gas composition, pretreatment and reaction temperature. Steady state catalytic activity is positively correlated with increasing bulk chi-carbide content for silica-supported Fe and FePt catalysts but not for FePtK.The bulk and surface carbonaceous species was both measured with high pressure in situ Mössbauer spectroscopy and TPSR-MS. A correlation between the amount of reactive -carbon (C ) and initial catalytic activity was established. An modified method was proposed for quantitative measurement of irreversible CO site density on the iron catalysts. Finally, a comprehensive model was proposed for iron phase transformations during pretreatment, FTS and post-reaction passivation/oxidation.

O autorze

Dr. Jian Xu graduated from Brigham Young University in 2003
with a brief a postdoc fellow work in UC Berkeley. Currently he
is the Deputy Director of the R&D center under Synfuels China.
From 2004 to 2007, he worked as a senior project engineer for
China Shenhua Coal Liquefaction company and the China Combined
Working Team.