Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 48, Issue 21, Pages 9490-9497Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie900334g
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Funding
- Center for Environmentally Beneficial Catalysis under the National Science Foundation Engineering Research Centers Grant [EEC-0310689]
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The facile desorption of C-8 and heavier products from solid acid alkylation catalysts is essential to thwart catalyst deactivation by fouling. To better understand this phenomenon, a tapered element oscillating microbalance (TEOM) was employed to investigate the adsorption/desorption characteristics of 224-trimethylpentane (224-TMP), a proxy C-8 alkylate product, on beta-zeolite and mesoporous materials (T = 298-473 K, P224-TMP = 0-0.3 bar) It is found that the 224-TMP desorption rates from saturated beta-zeolite (by helium purging) are characterized by a rapid initial burst of 224-TMP followed by a rather long desorption phase. Complementary experimental and modeling investigations using pelletized beta-zeolites of known sizes indicate that the adsorption rate and initial desorption (during the burst phase) rate of 224-TMP are controlled by meso-/macropore diffusion resistance external to the beta-zeolite crystals and that the long transient could be due to pore diffusion resistance within the beta-zeolite crystals. In contrast, mesoporous silica materials provide facile pore accessibility for large alkylate molecules such as 224-TMP, as evidenced by complete desorption of 224-TMP even at mild temperatures These insights provide guidance for rational engineering of stable solid acid alkylation catalysts
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