Characteristics on HDS over amorphous silica-alumina in single and dual catalytic bed system for gas oil

Joo Il Park, Koji Nakano, Young Kwang Kim, Jin Miyawaki, Seong Ho Yoon, Isao Mochida

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Deep hydrodesulfurization (HDS) was investigated over amorphous silica-alumina (ASA), produced using various synthetic methods as supports for NiMo catalysts, in single and dual catalytic bed systems. NiMoS active components supported on ASA-2 (ASA from synthetic method 2) achieved S levels of 4.5 and 3.0 ppm at 345 and 360 °C, respectively, in single catalytic beds, which was the highest HDS reactivity. Dual catalytic beds were introduced to inhibit excess hydro-cracking of C species in gas oil. For the dual catalytic combination of LX6 (commercial catalyst for reactive S species) and NMASA-2 (NiMoS supported on ASA-2), the S levels were 5.4 and 2 ppm at 345 and 360 °C, respectively, indicating that the performance was enhanced at higher temperatures, likely due to improved activity for refractory S species. The increased reactivity for HDS over NMASA-2 was related to the strong acidity of this support due to tetrahedrally coordinated Al species. In addition, the smaller homogeneous particle size of the support influenced the HDS catalytic performance. Moreover, weaker interactions between the Mo and ASA-2 in NMASA-2 improved the HDS reactivity, as confirmed by laser Raman spectroscopy.

Original languageEnglish
Pages (from-to)100-106
Number of pages7
JournalCatalysis Today
Volume164
Issue number1
DOIs
Publication statusPublished - Apr 30 2011

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Fingerprint Dive into the research topics of 'Characteristics on HDS over amorphous silica-alumina in single and dual catalytic bed system for gas oil'. Together they form a unique fingerprint.

  • Cite this