Synthesis of ZnO-CuO and ZnO-Co3O4 Materials with Three-Dimensionally Ordered Macroporous Structure and Its H2S Removal Performance at Low-Temperature

Abstract

H2S is a common but hazardous impurity in syngas, biogas, or natural gas. For some advanced power generation technologies, such as integrated gasification combined cycle (IGCC), solid oxide fuel cells, H2S content needs to be reduced to an acceptable level. In this work, a series of highly porous Zn-Cu and Zn-Co composites with three-dimensionally ordered macropores (3DOM) structure were synthesized via the colloidal crystal template method and used to remove H2S at 150 °C and one atm. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption studies, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were carried out to analyze the fresh and spent adsorbents. The results show that all the adsorbents possess well-ordered macropores, a large surface area, and a highly dispersed active phase. The relative content of Zn and (Cu or Co) has a significant influence on the desulfurization performance of adsorbents. The addition of CuO significantly increases the sulfur capacity and 3DOM-Zn0.5Cu0.5 shows the largest sulfur capacity of all the adsorbents, reaching up to 102.5 mg/g. The multiple adsorption/regeneration cycles of 3DOM-Zn0.5Cu0.5 and 3DOM-Zn0.5Co0.5 indicate that the as-prepared adsorbents are stable, and the sulfur capacity can still exceed 65% of the fresh adsorbents after six cycles.

Two-Dimensional N-Doped Carbon with Embedded Microfluidic-Architected Fe, Mo Nanodots toward Efficient Electrocatalytic Nitrogen Reduction

“…Considering the vital role of nitrogen capacity in ENRR performance, Brunauer–Emmett–Teller (BET) surface area analysis and temperature-programmed desorption (N 2 -TPD) were carried out to investigate the nitrogen adsorption ability of g-C 3 N 4 and FeMo/g-C 3 N 4 . As shown in Figure f, the nitrogen adsorption–desorption isotherms of both g-C 3 N 4 and FeMo/g-C 3 N 4 display similar curves, conforming to the type IV isotherm according to the IUPAC classification . Moreover, the BET specific surface area of g-C 3 N 4 can be determined as 96.15 m 2 g –1 , indicating the adequate surface for nitrogen adsorption and metal loading.…”

“…As shown in Figure 3f, the nitrogen adsorption−desorption isotherms of both g-C 3 N 4 and FeMo/g-C 3 N 4 display similar curves, conforming to the type IV isotherm according to the IUPAC classification. 51 Moreover, the BET specific surface area of g-C 3 N 4 can be determined as 96.15 m 2 g −1 , indicating the adequate surface for nitrogen adsorption and metal loading. In addition, after loading Fe, Mo nanodots, a slight decline in the BET specific surface area of FeMo/g-C 3 N 4 is observed (63.31 m 2 g −1 ) owing to the relatively high density of the metallic nanodots.…”