Phosphorus modification to improve the hydrothermal stability of a Cu-SSZ-13 catalyst for selective reduction of NOx with NH 3

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Huawang Zhao
  • Yingnan Zhao
  • Mengke Liu
  • Xianghui Li
  • Yuhan Ma
  • Xin Yong
  • Hong Chen
  • Yongdan Li

Research units

  • Tianjin University

Abstract

Phosphorus is introduced to modify the Cu-SSZ-13 catalyst via incipient wetness impregnation, with P/Cu-SSZ-13 = 1 and 2 wt.%, and Si/Al = 4, for selective catalytic reduction of NOx with NH 3 . N 2 physisorption and XRD results show the incorporation of phosphorus as phosphate acid enhanced the hydrothermal stability of Cu-SSZ-13 significantly, during hydrothermal aging in 10 vol.% H 2 O/air at 750 °C for 16 h. NMR and Raman results suggest that phosphate ions migrate and coordinate with the framework-bonded Al species, forming a framework silicoaluminophosphate interface, thus impeding further dealumination and structure collapse. Before the hydrothermal aging, the isolated Cu 2+ ions partly interact with the phosphate ions, forming Cu-phosphate species and reducing the SCR performance. Nevertheless, the appropriate content of phosphate ions can prevent the structure collapse caused by the hydrothermal aging, remaining the isolated Cu 2+ ions as well as excellent SCR performance.

Details

Original languageEnglish
Pages (from-to)230-239
Number of pages10
JournalApplied Catalysis B: Environmental
Volume252
Publication statusPublished - 5 Sep 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Cu-SSZ-13, Emission control, Hydrothermal aging, NH -SCR, Phosphorus modification, CU-SAPO-34, CRACKING, SI/AL RATIO, PERFORMANCE, NH3-SCR, CU SITES, NMR, PROMOTION, CU/SSZ-13, ZEOLITE

ID: 33777643