Scholarlink

<p>The dry reforming of biogas provides a promising route for generating syngas sustainably by concurrently converting CH<sub>4</sub> and CO<sub>2</sub>. However, the presence of trace H<sub>2</sub>S in biogas streams can significantly influence catalyst stability and performance. In this study, Ni-based catalysts promoted with M (M = K, Mg, Ba, Y, Ce, La) and supported on commercial or sol-gel alumina were synthesized via wet impregnation. The physical and chemical characteristics of the catalysts were analyzed using XRD, N<sub>2</sub> adsorption–desorption, DRIFTS, TGA, Raman, XPS, SEM, TPR and ICP-OES techniques. All samples exhibited mesoporous structures, while DRIFTS results indicated that promoter addition reduced the surface acidity of Ni-based commercial alumina-supported catalyst in the following order: K &gt; Mg &gt; Y &gt; Ce &gt; Ba &gt; La. In H<sub>2</sub>-TPR profile of sol-gel alumina supported Ni-La catalyst, a broad reduction peak spanning from 700&#xa0;°C to 900&#xa0;°C were observed, indicating the reduction of nickel aluminate spinel (NiAl<sub>2</sub>O<sub>4</sub>) phases, which are associated with strong interactions between Ni species and the alumina support. XRD analysis showed that La incorporation increased the nickel crystal size, which may have enhanced the reducibility of nickel species in Ni-based alumina catalyst, particularly in commercial alumina-supported catalyst. Catalytic activity was tested at 750&#xa0;°C under atmospheric conditions in the presence of 50 ppm H<sub>2</sub>S. The incorporation of La decreased CH<sub>4</sub> conversion from 77% to 62% and significantly suppressed coke formation from 9% to 1.2% for the sol-gel alumina-supported catalyst. The results demonstrated that the effect of La strongly depended on the support type. For the commercial alumina-supported catalyst (CAL), La enhanced Ni reducibility and improved sulfur tolerance, whereas for the sol-gel alumina- supported catalyst (SGA), La decreased catalyst acidity, contributing to a substantial reduction in carbon deposition. These findings highlight the critical balance between promoter effects, catalytic activity, sulfur tolerance, and coke suppression in Ni-based systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of H2S on the Catalytic Conversion of Biogas to Syngas

  • 期刊论文

  • 发表日期：

    2026年7月28日

查看全文
  • Musab E. K. Doutoum,
  • Mert Yekta Dogan,
  • Hale Akansu,
  • Pinar Degirmencioglu,
  • Huseyin Arbag,
  • Levent Degirmenci

摘要

The dry reforming of biogas provides a promising route for generating syngas sustainably by concurrently converting CH4 and CO2. However, the presence of trace H2S in biogas streams can significantly influence catalyst stability and performance. In this study, Ni-based catalysts promoted with M (M = K, Mg, Ba, Y, Ce, La) and supported on commercial or sol-gel alumina were synthesized via wet impregnation. The physical and chemical characteristics of the catalysts were analyzed using XRD, N2 adsorption–desorption, DRIFTS, TGA, Raman, XPS, SEM, TPR and ICP-OES techniques. All samples exhibited mesoporous structures, while DRIFTS results indicated that promoter addition reduced the surface acidity of Ni-based commercial alumina-supported catalyst in the following order: K > Mg > Y > Ce > Ba > La. In H2-TPR profile of sol-gel alumina supported Ni-La catalyst, a broad reduction peak spanning from 700 °C to 900 °C were observed, indicating the reduction of nickel aluminate spinel (NiAl2O4) phases, which are associated with strong interactions between Ni species and the alumina support. XRD analysis showed that La incorporation increased the nickel crystal size, which may have enhanced the reducibility of nickel species in Ni-based alumina catalyst, particularly in commercial alumina-supported catalyst. Catalytic activity was tested at 750 °C under atmospheric conditions in the presence of 50 ppm H2S. The incorporation of La decreased CH4 conversion from 77% to 62% and significantly suppressed coke formation from 9% to 1.2% for the sol-gel alumina-supported catalyst. The results demonstrated that the effect of La strongly depended on the support type. For the commercial alumina-supported catalyst (CAL), La enhanced Ni reducibility and improved sulfur tolerance, whereas for the sol-gel alumina- supported catalyst (SGA), La decreased catalyst acidity, contributing to a substantial reduction in carbon deposition. These findings highlight the critical balance between promoter effects, catalytic activity, sulfur tolerance, and coke suppression in Ni-based systems.