skip to main content

SciTech ConnectSciTech Connect

Title: Effect of Pt promotion on Ni/Al{sub 2}O{sub 3} for the selective catalytic reduction of NO with hydrogen

Ni/Al{sub 2}O{sub 3} (10 wt.% Ni) and Ni-Pt/Al{sub 2}O{sub 3} (10 wt.% Ni, 0.5 wt.% Pt) were comparatively tested in the hydrogen selective catalytic reduction process (H{sub 2}-SCR), at reaction temperatures below 350°C. Catalytic activity tests consisted in temperature programmed reactions (TPRea) under plug flow conditions from 50 to 350°C, with a temperature rate of 5°C/min, using a feed stream with a reactant ratio NO:H{sub 2} = 1:1.3 and a GHSV of 4500 h{sup −1}. Promotion with Pt increases the catalytic performances of the Ni based catalyst, in respect to NO conversion, N{sub 2} selectivity and N{sub 2} yield. The reaction temperatures for NO conversion above 95% decrease significantly due to Pt addition, from 250°C for Ni/Al{sub 2}O{sub 3} to 125°C for Ni-Pt/Al{sub 2}O{sub 3}. Characterization of catalysts was performed by: X ray powder diffraction (XRD) for the estimation of Ni crystallite size, temperature programmed reduction (TPR) for the catalyst reducibility, temperature programmed desorption of hydrogen (H{sub 2}-TPD) for the investigation of active sites and metal dispersion on the support, N{sub 2} adsorption-desorption isotherms at −196°C for the determination of total specific surface area and pore size distribution, and H/D isotopic exchange on the catalyst surface.
Authors:
; ; ;  [1]
  1. National Institute for Research and Development of Isotopic and Molecular Technologies-INCDTIM, 65-103 Donath Str., 400293 Cluj-Napoca (Romania)
Publication Date:
OSTI Identifier:
22257172
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1565; Journal Issue: 1; Conference: PIM 2013: International conference on processes in isotopes and molecules, Cluj Napoca (Romania), 25-27 Sep 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; ALUMINIUM OXIDES; CATALYSTS; DESORPTION; DISPERSIONS; HYDROGEN; ISOTHERMS; ISOTOPIC EXCHANGE; NITRIC OXIDE; SELECTIVE CATALYTIC REDUCTION; X-RAY DIFFRACTION