Highly Carbon-Resistant Y Doped NiO–ZrOm Catalysts for Dry Reforming of Methane

Ye Wang,Yannan Wang,Patrick Da Costa,Li Li,Changwei Hu

doi:10.3390/catal9121055

Abstract

Yttrium-doped NiO–ZrOm catalyst was found to be novel for carbon resistance in the CO2 reforming of methane. Yttrium-free and -doped NiO–ZrOm catalysts were prepared by a one-step urea hydrolysis method and characterized by Brunauer-Emmett-Teller (BET), TPR-H2, CO2-TPD, XRD, TEM and XPS. Yttrium-doped NiO–ZrOm catalyst resulted in higher interaction between Ni and ZrOm, higher distribution of weak and medium basic sites, and smaller Ni crystallite size, as compared to the Y-free NiO–ZrOm catalyst after reaction. The DRM catalytic tests were conducted at 700 °C for 8 h, leading to a significant decrease of activity and selectivity for the yttrium-doped NiO–ZrOm catalyst. The carbon deposition after the DRM reaction on yttrium-doped NiO–ZrOm catalyst was lower than on yttrium-free NiO–ZrOm catalyst, which indicated that yttrium could promote the inhibition of carbon deposition during the DRM process.

Highlights

Fischer-Tropsch (F-T) synthesis has become a significant process for producing liquid organic hydrocarbons from syngas (H2 and CO)
The NiO–ZrOm catalyst shows a surface area of 113 m2 /g and a pore volume of 2 nm; while, the NiO–ZrOm –YOn catalyst exhibits the lower specific surface area (79 m2 /g ) and the smaller pore volume (0.1 cm3 /g), which may decrease the activity of the catalyst, because the high surface area can enhance the activity of the catalyst [31]
The content of Zr4+ and Zr3+ on both catalysts after reduction determined by X-ray photoelectron spectroscopy (XPS), and the content of Ni on both catalysts determined by Inductively

Summary

Introduction

Fischer-Tropsch (F-T) synthesis has become a significant process for producing liquid organic hydrocarbons from syngas (H2 and CO). There are several methods to produce syngas: e.g., steam reforming of methane (Equation (1)), partial oxidation of methane (Equation (2)) and dry reforming of methane (Equation (3)) [1,2,3,4,5] Among these methods, the dry reforming of methane has a competitive advantage of producing clean hydrogen and carbon monoxide mixture gases with an equimolar ratio (1:1), which best suits for F-T synthesis. The dry reforming of methane has a competitive advantage of producing clean hydrogen and carbon monoxide mixture gases with an equimolar ratio (1:1), which best suits for F-T synthesis Another significant aspect is the consumption of two greenhouse gases (CO2 and CH4 ), thereby offering an environmental benefit [3,6].

Methods

Results

Conclusion