Honeycomb Structured Catalysts for H2 Production via H2S Oxidative Decomposition

Abstract

Cordierite honeycomb structured catalysts were studied for the reaction of H2S decomposition in the presence of oxygen to obtain H2 and sulphur. An Al2O3-based washcoat was deposited on the honeycomb monolith by a dip-coating procedure. In particular, three different washcoat percentages (15, 20 and 30 wt%) were deposited on the structured carrier and the obtained samples were characterized by N2 adsorption and SEM analysis. The evaluation of the catalytic performance of the three samples was carried out at two different temperatures (1000 °C and 1100 °C). The sample with 30 wt% washcoat content showed the lowest SO2 selectivity at 1000 °C (<0.4%), whereas the H2S conversion and H2 yield values were very similar to those achieved for the samples at 15 and 20 wt% washcoat loading. Based on these results, additional tests were carried out on the catalyst with 30 wt% Al2O3-based washcoat loading, varying the contact time and the H2S inlet concentration to identify the operating conditions that minimize the SO2 formation, obtaining good H2S conversion and H2 yield. The comparison of the structured catalyst with the powder alumina sample has shown the same catalytic performance, exhibiting lower SO2 selectivity.

Ni-Mo Sulfide Semiconductor Catalyst with High Catalytic Activity for One-Step Conversion of CO2 and H2S to Syngas in Non-Thermal Plasma

“…They also prepared cordierite-honeycomb-structured catalysts for H 2 S oxidative decomposition at high temperature. It revealed that the optimal washcoat percentage of 30 wt% for the catalysts could obtain high H 2 S conversion and H 2 yield [11]. Previously, we demonstrated that the semiconductor catalysts synergistically working with non-thermal plasma could exhibit excellent performance in H 2 S decomposition [12][13][14].…”

In Situ DRIFTS Investigation on CeOx Catalyst Supported by Fly-Ash-Made Porous Cordierite Ceramics for Low-Temperature NH3-SCR of NOX

“…Porous cordierite (2MgO•2Al 2 O 3 •5SiO 2 ) ceramics have been widely adopted as catalyst supports due to their high chemical and mechanical stability, low thermal expansion coefficient and high porosity [19]. Qiu et al [20] reported a series of cordierite supported V 2 O 5 -MoO 3 /TiO 2 catalysts that were synthesized through an impregnation method for NH 3 -SCR.…”

“…Liu et al [21] prepared a Al 2 O 3 -coated cordierite supported CuO catalyst for NH 3 -SCR and reported that the SCR reaction followed the E-R mechanism over the synthesized catalyst. In most works, the cordierite ceramics used are commercial products [19][20][21][22], which are expensive due to the high fabrication costs and the complex preparation process [23]. In our previous work, porous cordierite ceramics have been successfully synthesized from fly ash and natural minerals.…”