Xiongbo Chen

Publications (4)9.21 Total impact

• Article: Ceria supported on sulfated zirconia as a superacid catalyst for selective catalytic reduction of NO with NH(3).

  Shan Gao, Xiongbo Chen, Haiqiang Wang, Jiansong Mo, Zhongbiao Wu, Yue Liu, Xiaole Weng
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  ABSTRACT: In this paper, ceria supported on sulfated zirconia (CeSZ) as a superacid catalyst was synthesized and the resulted performances for selective catalytic reduction (SCR) of NO with NH(3) were investigated. Experimental results revealed that the sulfation of zirconia supports could greatly improve the SCR activity of the catalysts. Among the tested samples, the CeSZ catalyst with Ce/Zr mole ratio at 0.095 possessed the highest NO conversion (i.e., 98.6% at ca. 420°C and 180,000h(-1)). The sulfation had led to a formation of pure tetragonal phase of ZrO(2), a well dispersion of CeO(2), abundant stable superacid sites, increasing surface area and enrichment of Ce(3+) on the surface, all of which were responsible for its excellent performance in SCR of NO with NH(3).
  Journal of Colloid and Interface Science 01/2013; · 3.07 Impact Factor
• Article: Polyethyleneimine functionalized protonated titanate nanotubes as superior carbon dioxide adsorbents.

  Jie Liu, Yue Liu, Zhongbiao Wu, Xiongbo Chen, Haiqiang Wang, Xiaole Weng
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  ABSTRACT: In this paper, protonated titanate nanotubes (PTNTs) were modified with polyethyleneimine (PEI) by wet impregnation method for CO(2) adsorption. Their micro-morphology and structural properties were characterized by a range of analytical techniques, including XRD, TEM, SEM, N(2) adsorption etc. Experimental results revealed that the functionalized PTNTs with 50wt.% PEI loaded exhibited a high CO(2) adsorption capacity of 130.8mg/g-sorbent at 100°C. Only a minor loss of its capacity was observed after five consecutive adsorption-desorption runs. The PEI was existed both in the internal and external mesoporous pores of PTNTs via chemical combination between amino group and enriched protons, which accounted for their good thermal stability at elevated temperatures. The results present herein imply that the PEI modified PTNTs could be appealing materials for capturing CO(2) from power plant flue gas.
  Journal of Colloid and Interface Science 07/2012; 386(1):392-7. · 3.07 Impact Factor
• Article: Effect of pH value on the microstructure and deNO(x) catalytic performance of titanate nanotubes loaded CeO2.

  Xiongbo Chen, Haiqiang Wang, Shan Gao, Zhongbiao Wu
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  ABSTRACT: The relationship between catalytic performance and pH value of post-treatment of the catalyst supports-titanate materials was investigated and discussed. Three types of titanate nanotubes (TNTs) that are acidic TNTs (TNTs-1.6, pH value at 1.6), neutral TNTs (TNTs-7), and alkaline TNTs (TNTs-12) were synthesized by hydrothermal method with the controlled washing pH value and then were used as the catalyst supports for ceria. These titanate-supported ceria catalysts showed extremely different performance for the selective catalytic reduction in NO. The pH value had a notable effect on the structure and composition of titanate nanotubes and further affected the state and redox property of cerium oxides. The structure of TNTs-1.6, TNTs-7, and TNTs-12 were identified as anatase-like structure, protonated titanate (H(2)Ti(3)O(7)), and Na-containing titanate, respectively. Indeed, the residual sodium (TNTs-12) was harmful to ceria, but the presence of water in the interlayer (TNTs-7) was beneficial to the stability of nanotube structure. Therefore, TNTs-7 doped ceria showed the best SCR activity among these tested samples.
  Journal of Colloid and Interface Science 03/2012; 377(1):131-6. · 3.07 Impact Factor
• Article: Novel H2Ti12O25-Confined CeO2 Catalyst with Remarkable Resistance to Alkali Poisoning Based on the “Shell Protection Effect”

  Xiongbo Chen, Haiqiang Wang, Zhongbiao Wu, Yue Liu, Xiaole Weng
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  ABSTRACT: In this paper, a novel catalyst, titanate nanotube (TNT) confined CeO2 was designed and synthesized. Such catalyst showed a remarkable resistance to alkali metal poisoning in deNOx application. The catalyst effectively shielded the main active phase, CeO2, from the poisons with the tubular channel of H2Ti12O25. Furthermore, the poisons (e.g., Na+) could also be stabilized in the interlayer of H2Ti12O25 through ion exchange. This catalyst developed herein gives a new sight for the design of “shell protection” catalysts to improve their tolerance to poisons.
  08/2011;