Investigation on the simultaneous removal of COS, CS2 and O2 from coke oven gas by hydrogenation on a Pd/Al2O3 catalyst

Eva Kamp,Jens-Uwe Repke,Olaf Von Morstein,Sven Kureti,Norman Schreiter,Holger Thielert

doi:10.1039/c9cy02579k

Eva Kamp, Jens-Uwe Repke + Show 4 more

Open Access

https://doi.org/10.1039/c9cy02579k

Copy DOI

Abstract

Simultaneous hydrogenation of organosulfur compounds and O2 by Pd/Al2O3 catalyst was studied in a fixed bed reactor and by DRIFTS.

Highlights

For deep desulfurization of diesel fuels, noble metal catalysts based on platinum and palladium were investigated with promising results.[13,14,15,16,17] But, only little is known on the HDS performance of noble metals in gaseous streams containing COS or mercaptans
In addition to the evaluation of the catalytic performance, in situ diffuse reflectance infrared Fourier transform spectroscopy coupled with mass spectrometry was conducted to obtain some mechanistic insights into the complex reaction network, at low temperatures
The performance of a Pd/Al2O3 catalyst was evaluated for the simultaneous hydrogenation of organosulfur compounds and conversion of O2, while some mechanistic investigations were made by DRIFT spectroscopy coupled with MS

Summary

Introduction

Some papers investigated the interaction of sulfur compounds with Pt and Pd catalysts. Bartholomew et al.[19] reported on the dissociative adsorption of COS, CS2 and methyl mercaptan (CH3SH) with strong sticking of the sulfur on the noble metals. Reinhoudt et al.[14] studied the nature of the active sites on alumina–silica-supported Pt suggesting that the desulfurization takes place on vacancies present in small platinum particles. High activity was attributed to the support acidity affecting the electron deficiency and weakening the noble metal–sulfur bond.[20] Pt and Pd sulfides originated from HDS can effectively be regenerated by reaction with H2 above 463 K.17,21,22. With the above background the present study is the first that deals with the simultaneous removal of organosulfur compounds and O2 from coke oven gas by hydrogenation on a commercially available Pd/Al2O3 catalyst. In addition to the evaluation of the catalytic performance, in situ diffuse reflectance infrared Fourier transform spectroscopy coupled with mass spectrometry was conducted to obtain some mechanistic insights into the complex reaction network, at low temperatures

Catalytic studies

In situ DRIFTS and MS studies

Results and discussion

Mechanistic studies

Conclusions