Novel ZnO-NiO-graphene-based sorbents for removal of hydrogen sulfide at intermediate temperature

•New family of reduced graphene Zn-Ni-rGO sorbents synthesized.•Prepared by non-expensive and easily replicable methods.•Studied for the first time for H2S reactive adsorption for syngas to biofuels.•Lab-scale performance studied for fixed bed desulfurization in syngas processing.•Better capacity at...

Full description

Saved in:
Bibliographic Details
Published in:Fuel (Guildford) 2022-04, Vol.314, p.122724, Article 122724
Main Authors: Sánchez-Hervás, J.M., Maroño, M., Fernández-Martínez, R., Ortiz, I., Ortiz, R., Gómez-Mancebo, M.B.
Format: Article
Language:English
Subjects:
Adsorption
Catalysts
Corrosion products
Desulfurization
Fixed beds
Gas cleaning
Gas streams
Graphene
Hydrogen
Hydrogen sulfide
Nickel oxides
Refineries
Sorbent
Sorbents
Sulfur
Syngas
Synthesis gas
Zinc
Zinc oxide
ZnO-NiO-rGO composite
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•New family of reduced graphene Zn-Ni-rGO sorbents synthesized.•Prepared by non-expensive and easily replicable methods.•Studied for the first time for H2S reactive adsorption for syngas to biofuels.•Lab-scale performance studied for fixed bed desulfurization in syngas processing.•Better capacity at intermediate temperature than the commercial counterparts. When syngas is upgraded to bio-refinery products, hydrogen sulfide removal is necessary to prevent corrosion of equipment and avoid poisoning of sulfur sensitive catalysts. Technologies relying on sorbents working in the 300–500 °C temperature range are desirable for better process integration. In this work, a new family of reduced graphene ZnO-NiO sorbents, Zn-Ni-rGO, were synthesized by non-expensive and easily replicable scalable methods and studied for the first time for hydrogen sulfide reactive adsorption. Preparation was based on the Hummers & the improved Tour methods followed by addition of Zn(NO3), Ni(NO3), hydrothermal reduction and annealing. As obtained as well as post-reaction rGO-NiO-ZnO sorbents were characterized by XRF, XRD and N2 adsorption at −196 °C. The performance of the sorbents for fixed bed desulfurization was determined at lab-scale (P = 10 bar, T = 400 °C, GHSV = 3500 h−1) on a gas stream containing 9000 ppmv of H2S/N2. The sorbents showed better hydrogen sulfide removal capacity than the commercial one studied for comparison, what makes them a potential candidate for gas cleaning in the syngas-related sectors.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122724