Scholarlink

Abstract <p>This study investigates how the precursor type, catalyst composition, metal salt ratio, and sulfur content affect the catalytic performance of dispersed (unsupported) bimetallic transition-metal sulfide catalysts in guaiacol hydrotransformation under water–gas shift conditions (CO + H<sub>2</sub>O). The dispersed catalysts were synthesized <i>in situ</i> from oil-soluble or water-soluble transition-metal salts. After decomposition of precursors, the resulting oxides were sulfided using elemental sulfur in the reaction mixture as a sulfiding agent precursor. Under typical test conditions (340°C, 5 MPa CO at 25°C, 6 h, Mo : guaiacol = 1 : 75, 20 wt % H<sub>2</sub>O), the Ni–Mo catalyst derived from water-soluble precursors at a Ni : Mo molar ratio of 1 : 3 with 1.0–1.5 wt % sulfur achieved 95–100% guaiacol conversion, with a total yield of cyclohexene and cyclohexane (the main hydrocarbon products) of 25–35%. Phenol represented 38–42% of the products regardless of sulfur content and the lowest selectivity to phenol (32%) was detected for sulfur content of 1.25 wt %. However, raising the sulfur content from 1.25 to 1.5 wt % reduced cyclohexanone selectivity from 22 to 15%.</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

Dispersed Transition-Metal Sulfides for Guaiacol Hydrotransformation under Water–Gas Shift Conditions: Effects of Precursor Type and Composition of Reaction Medium on Catalytic Performance

  • 期刊论文

  • 发表日期：

    2026年3月1日

查看全文
  • Anna V. Vutolkina

摘要

Abstract

This study investigates how the precursor type, catalyst composition, metal salt ratio, and sulfur content affect the catalytic performance of dispersed (unsupported) bimetallic transition-metal sulfide catalysts in guaiacol hydrotransformation under water–gas shift conditions (CO + H2O). The dispersed catalysts were synthesized in situ from oil-soluble or water-soluble transition-metal salts. After decomposition of precursors, the resulting oxides were sulfided using elemental sulfur in the reaction mixture as a sulfiding agent precursor. Under typical test conditions (340°C, 5 MPa CO at 25°C, 6 h, Mo : guaiacol = 1 : 75, 20 wt % H2O), the Ni–Mo catalyst derived from water-soluble precursors at a Ni : Mo molar ratio of 1 : 3 with 1.0–1.5 wt % sulfur achieved 95–100% guaiacol conversion, with a total yield of cyclohexene and cyclohexane (the main hydrocarbon products) of 25–35%. Phenol represented 38–42% of the products regardless of sulfur content and the lowest selectivity to phenol (32%) was detected for sulfur content of 1.25 wt %. However, raising the sulfur content from 1.25 to 1.5 wt % reduced cyclohexanone selectivity from 22 to 15%.