Al- and Ga-promoted WO3/ZrO2 strong solid acid catalysts and their catalytic activities in n-butane isomerization

Xiao Rong Chen, Chang Lin Chen, Nan Ping Xu, Chung Yuan Mou

Research output: Contribution to journalConference articlepeer-review

36 Citations (Scopus)

Abstract

A series of Al- and Ga-promoted tungstated zirconia strong solid acid catalysts were prepared. The effect of Al2O3 and Ga 2O3 on the structural, acidic and redox features of WO3/ZrO2 (WZ) has been characterized by means of X-ray powder diffraction (XRD), N2 adsorption (BET), UV-visible diffuse reflectance spectra (UV-vis), infrared spectra (IR), NH3 temperature-programmed desorption (NH3-TPD) and H2 temperature-programmed reduction (H2-TPR). With respect to tungstated zirconia, the promoted catalysts stabilized the zirconia tetragonal phase, prevented crystalline WO3 growth. Al or Ga addition to WZ had less effect on the strength of the acid sites, but effected reduction temperature of WZ. The isomerization of n-butane was investigated at 300°C over tungstated zirconia and promoted catalysts. The promoted catalysts improved the isomerization conversion and stability in the presence of hydrogen. The best Al and Ga loading in these catalysts is around 0.5 and 1.0%, respectively, and the optimal calcination temperature is ∼850°C. The experiment results showed that Ga was a more efficient promoter than Al. Pt addition to promoted catalysts showed great improvement on the performance of selectivity and stability.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalCatalysis Today
Volume93-95
DOIs
Publication statusPublished - Sep 1 2004
Externally publishedYes
EventSelections from the Presentations of the 3rd Asia-Pacific Congress - Dalian, China
Duration: Oct 12 2003Oct 12 2003

Keywords

  • AlO/WO /ZrO
  • Butane isomerization
  • GaO/WO/ZrO
  • Strong solid acid
  • WO/ZrO

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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