ABSTRACT

In the present study, desulfurization and de-ashing of the low rank lignite coal were investigated by catalytic oxidation using H₂O₂/HCOOH oxidation system in the presence of Fe³⁺ and Cu²⁺ as catalysts. The catalysts were loaded in three different forms along with coal during oxidation, including impregnated on coal, as aqueous solutions and supported on activated carbon. Before oxidation, the coal sample was leached with HNO₃ and KOH solutions, out of which HNO₃ exhibited good results. Furthermore, among the three modes of catalysts loading, the catalyst loaded on AC was more efficient. In case of Fe and Cu loaded on AC, about 81% and 71% sulfur and ash were removed with 0.1% Fe/AC. Likewise, in the presence of 0.1% Cu/AC catalyst, the level of sulfur and ash removed was 88.04 and 79.81% respectively. Post-treatment characterization of the coal sample revealed that the heating value of the coal sample has slightly declined with the catalytic oxidation, probably due to surface oxidation of coal, which was confirmed by the FTIR analysis. The XRD analysis of the ash suggested that the coal samples had mostly Quartz, hematite and clay substances, representing the mineral matter in coal, most of these were removed during oxidation.

摘要

^{本研究以Fe 3+}和Cu ²⁺为催化剂，采用H ₂ O ₂ /HCOOH氧化体系催化氧化法对低阶褐煤进行脱硫脱灰研究。催化剂在氧化过程中以三种不同的形式与煤一起负载，包括浸渍在煤上、作为水溶液以及负载在活性炭上。_{氧化前，煤样用HNO 3}和KOH溶液浸出，其中HNO ₃表现出了良好的效果。此外，在三种催化剂负载模式中，负载在AC上的催化剂效率更高。在活性炭上负载铁和铜的情况下，0.1% Fe/AC 去除了约 81% 和 71% 的硫和灰分。同样，在 0.1% Cu/AC 催化剂存在下，硫和灰分的去除率分别为 88.04% 和 79.81%。煤样的后处理表征表明，煤样的热值随着催化氧化而略有下降，这可能是由于煤的表面氧化所致，这一点通过 FTIR 分析得到了证实。灰分的X射线衍射分析表明，煤样主要含有石英、赤铁矿和粘土物质，代表煤中的矿物质，其中大部分在氧化过程中被去除。