Transition metal chalcogenide bifunctional catalysts for chemical recycling by plastic hydrocracking: a single-source precursor approach

Abstract

Sulfided nickel, an established hydrocracking and hydrotreating catalyst for hydrocarbon refining, was synthesized on porous aluminosilicate supports for the hydrocracking of mixed polyolefin waste. Zeolite beta, zeolite 13X, MCM41 and an amorphous silica-alumina catalyst support were impregnated with the single-source precursor (SSP) nickel (II) ethylxanthate for catalyst support screening. Application of this synthesis method to beta-supported nickel (Ni@Beta), as an alternative to wet impregnation using aqueous nickel (II) nitrate, provided catalytic materials with higher conversion to fluid products at the same mild batch reaction conditions of 330°C with appropriate agitation and 20 bar H 2 pressure. Mass balance quantification demonstrated that SSP-derived 5wt%Ni@Beta yielded a greater than 95 wt% conversion of a mixed polyolefin feed to fluid products, compared with 39.8 wt% conversion in the case of 5wt%Ni@Beta prepared by wet impregnation. Liquid and gas products were quantitatively analysed by gas chromatography–flame ionization detection (GC-FID) and gas chromatography–mass spectrometry (GC-MS), revealing a strong selectivity to saturated C 4 (37.3 wt%), C 5 (21.6 wt%) and C 6 (12.8 wt%) hydrocarbons in the case of the SSP-derived catalyst.

A reusable, impurity-tolerant and noble metal–free catalyst for hydrocracking of waste polyolefins

“…Recent works have studied the applicability of catalyst in hydroconversion under scenarios including clean postconsumer plastics (39)(40)(41)(42), different additives (43), and mixed polyolefins (19,(44)(45)(46), but none of them were performed under different combinations of scenarios simultaneously. Herein, we first explored the application potential of MoS x -Hbeta in chemical recycling of real-world waste plastics.…”

Energy storehouse and a remarkable photocatalyst: Al2S3/Cu2S/Ni17S18 thin film as supercapacitor electrode and pollutants degradation

“…These metal chalcogenides nanomaterials have been utilised largely in various fields that focus on the semiconductor, photovoltaic, solar cells, telecommunication technologies [8][9][10]. The single source precursor route is preferable for the synthesis of metal chalcogenides mainly because of the already present metal-sulphur bonds [11,12]. The desired nanomaterials can be obtained by the careful decomposition of these compounds.…”

Advancing energy and water solutions: Unleashing the potential of Nd2S3:Ni9S8 thin film for supercapacitors and sustainable water purification

“…12 This distinguishing feature emphasizes the wide variety of uses that dithiocarbamate ligands have in the field of nanotechnology. 13 The adaptability of metal chalcogenides and the promise for further advancement in this area are highlighted by their capacity to complete a variety of roles in diverse technological sectors. The utilization of single-source precursor techniques and the strategic deployment of dithiocarbamate ligands enable the synthesis and manipulation of metal chalcogenides, opening up new horizons for their application in cutting-edge technologies.…”