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Indexed by:期刊论文

Date of Publication:2014-01-01

Journal:MICROPOROUS AND MESOPOROUS MATERIALS

Included Journals:SCIE、EI

Volume:183

Page Number:185-191

ISSN No.:1387-1811

Key Words:Nanofibrous SUZ-4; Pt/HSUZ-4; H-2-SCR; Morphology

Abstract:Nanofibrous SUZ-4 zeolite (NF) was synthesized for preparing the Pt/HSUZ-4 catalyst used in the selective catalytic reduction of NOx by hydrogen (H-2-SCR). The seed dissolution during the crystallization played an important role for the nanofibrous SUZ-4 formation. It was found that the zeolite NF is oriented along the 10-ring channels, and it has much more Bronsted acid sites on its external surface compared with general SUZ-4 zeolite. Consequently, Pt primarily existed as the well-dispersed particles (similar to 5 nm) on the NF external surface for the Pt/NF catalyst prepared by impregnation. In comparison with 0.1 wt.% Pt/HZSM-5 as well as general 0.1 wt.% Pt/HSUZ-4, the 0.1 wt.% Pt/NF catalyst gave much higher activity and N-2 selectivity in the H-2-SCR. For identifying the Pt ions in SUZ-4 zeolite channels, the band at 1652 cm(-1) ascribed to nitrous species adsorbed on the ions was proposed. (C) 2013 Elsevier Inc. All rights reserved.