Propane Steam Reforming over Catalysts Derived from Noble Metal (Ru, Rh)-Substituted LaNiO3 and La0.8Sr0.2NiO3 Perovskite Precursors.

Theodora Ramantani,Andreas Vavatsikos,Georgios Vatskalis,Dimitris I Kondarides,Georgios Bampos

doi:10.3390/nano11081931

Theodora Ramantani, Andreas Vavatsikos + Show 3 more

Open Access

https://doi.org/10.3390/nano11081931

Copy DOI

Journal: Nanomaterials	Publication Date: Jul 27, 2021
Citations: 10	License type: CC BY 4.0

Affiliation: University of Patras

Abstract

The propane steam reforming (PSR) reaction was investigated over catalysts derived from LaNiO3 (LN), La0.8Sr0.2NiO3 (LSN), and noble metal-substituted LNMx and LSNMx (M = Ru, Rh; x = 0.01, 0.1) perovskites. The incorporation of foreign cations in the A and/or B sites of the perovskite structure resulted in an increase in the specific surface area, a shift of XRD lines toward lower diffraction angles, and a decrease of the mean primary crystallite size of the parent material. Exposure of the as-prepared samples to reaction conditions resulted in the in situ development of new phases including metallic Ni and La2O2CO3, which participate actively in the PSR reaction. The LN-derived catalyst exhibited higher activity compared to LSN, and its performance for the title reaction did not change appreciably following partial substitution of Ru for Ni. In contrast, incorporation of Ru and, especially, Rh in the LSN perovskite matrix resulted in the development of catalysts with significantly enhanced catalytic performance, which improved by increasing the noble metal content. The best results were obtained for the LSNRh0.1-derived sample, which exhibited excellent long-term stability for 40 hours on stream as well as high propane conversion (XC3H8 = 92%) and H2 selectivity (SH2 = 97%) at 600 °C.

Highlights

The most common industrial process for hydrogen production is the steam reforming of natural gas, which accounts for ca. 85% of the total H2 produced worldwide [3,4,7]
This is in agreement with the results of previous studies, which showed that partial substitution of the A-sites of a perovskite generally results in an increase of the specific area surface areaa (SSA) induced by structural disorder and delay in the crystallite growth [52,73,74]
A further increase of the SSA up to 8 m2 g−1 was observed upon partial substitution of Ni by Ru or Rh in the B-sites of the LN and LSN perovskites, which is more significant for the samples containing larger amounts of noble metals (Table 1)

Summary

Introduction

Hydrogen (H2 ) appears to be the most promising future energy carrier since, when combined with fuel cells, it makes it possible to produce electricity for mobile, stationary, and industrial applications with minimal pollutant emissions [3,4,5]. Hydrogen is mainly produced via hydrocarbon conversion employing steam reforming (SR), dry reforming (DR), autothermal reforming (ATR), and partial oxidation (POX) reactions [6]. The most common industrial process for hydrogen production is the steam reforming of natural gas, which accounts for ca. The use of propane as a source of hydrogen has attracted significant attention in recent years because of its favorable physical properties The use of propane as a source of hydrogen has attracted significant attention in recent years because of its favorable physical properties (liquefaction at room temperature and ca. 9 bar), which facilitate its safe handling, storage, and transportation as well as its relatively low cost, abundance, and availability through the existing distribution network of liquefied petroleum gas (LPG) [13,14,15,16,17]

Methods

Results

Conclusion