Oxidative Desulfurization Catalyzed by Phosphotungstic Acid Supported on Hierarchical Porous Carbons.

Bao Wang,Mingyuan Zhu,Lihua Kang

doi:10.3390/nano11092369

Abstract

A hierarchical porous carbon material (HPC) with an ultra-high specific surface area was synthesized with sisal fiber (SF) as a precursor, and then H3PW12O40·24H2O (HPW) was immobilized on the support of SF-HPC by a simple impregnation method. A series characterization technology approved that the obtained SF-HPC had a high surface area of 3152.46 m2g−1 with micropores and macropores. HPW was well-dispersed on the surface of the SF-HPC support, which reduced the loading of HPW to as low as 5%. HPW/SF-HPW showed excellent catalytic performance for oxidative desulfurization, and the desulfurization rate reached almost 100% under the optimal reaction conditions. The desulfurization rate of HPW/SF-HPW could be maintained at above 94% after four recycles.

Highlights

Nanomaterials 2021, 11, 2369. https://Reduction in the sulfur content in oil products is the primary solution to decrease the pollution caused by oil burning [1]
The sisal fiber (SF)-hierarchical porous carbon material (HPC) materials had obvious macroporous structures, which provided the basis for preparing the support with a high specific surface area
The use of the ultra-high specific surface area and macroporous structure of the SF-HPC improved the dispersion of the HPW catalyst, avoiding the agglomeration of HPW and reducing the required HPW loading

Summary

Introduction

Nanomaterials 2021, 11, 2369. https://Reduction in the sulfur content in oil products is the primary solution to decrease the pollution caused by oil burning [1]. Among the developed desulfurization technologies, oxidative desulfurization is widely studied as the most promising process because of its mild reaction conditions and good desulfurization effect [2] In this approach, heteropoly acids such as phosphotungstate decompose in the presence of excessive hydrogen peroxide into a peroxide metal complex W(O2 )n , providing an active site for oxidative desulfurization [3,4]. The specific surface area was only 167 m2 g−1 , the pore diameter of the catalyst was 12.99 nm, and this large pore size increased the reaction mass transfer rate, allowing the HPW load to be reduced to 10%. Pham et al [9]

Methods

Results

Conclusion