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Desulfurization and de-ashing of low-rank coal by catalytic oxidation using Sn as catalyst loaded in different forms
International Journal of Coal Preparation and Utilization ( IF 2.1 ) Pub Date : 2020-10-04 , DOI: 10.1080/19392699.2020.1825078
Waqas Ahmad 1 , Ishraq Ahmad 1 , Imtiaz Ahmad 1 , Muhammad Yaseen 1 , Nisar Muhammad 2 , Muhammad Salman 1
Affiliation  

ABSTRACT

The desulfurization and de-ashing of Darra Adam Khel Coal (Pakistan) was studied by oxidation using Hydrogen peroxide (H2O2) and formic acid (HCOOH) oxidation system. The maximum de-ashing and desulfurization of about 63 and 48% was achieved through oxidation at 70°C in 90 min with H2O2 and HCOOH volume of 2 mL each. Catalytic oxidation was studied in the presence of Tin (Sn) as catalyst loaded under different forms, including as aqueous Tin chloride (SnCl2) solution, SnCl2 pre-impregnated on coal sample and Sn impregnated on activated carbon (AC). The catalyst shown high efficiency loaded in the form of impregnated on AC i.e. Sn/AC in the concentration of 0.086%. The maximum desulfurization of 68.1% and de-ashing of 44.63% was attained in the presence of 0.1% of Sn catalyst in the Aq. form, whereas in case of Sn pre-impregnated on coal, the maximum sulfur and ash removal of 69.1 and 44.6% was attained at 0.1% catalyst loading, respectively. Similarly, the catalyst used as Sn/AC, highest desulfurization and deashing of 82 and 72% is achieved at concentration of 0.086% Sn loaded on AC. Oxidation in the presence of Tin (Sn) catalyst shown a clear advantage of increasing the sulfur and ash removal from 48 and 63% to maximum of 82 and 72% respectively under optimized conditions. Post catalytic oxidation characterization of coal shown that the process had no negative effects on the coal properties, rather the overall coal quality was improved. This study provides a new approach for the desulfurization and de-ashing of Dara Adam Khel coal at mild operating conditions with minimum mechanical and reagents requirements and hence can be extended to any types of coal found in other parts of the world.

Abbreviations: AC: Activated carbon; ROM: Run of mine; ODS: Oxidative desulfurization; Sn/AC: Tin/Activated carbon; SEM: Scanning electron microscopy; FTIR: Fourier Transform Infrared radiation; ASTM: American system for testing and materials; GCV: Gross Calorific Value



中文翻译:

不同形态负载Sn催化氧化低阶煤脱硫脱灰

摘要

采用过氧化氢 (H 2 O 2 ) 和甲酸 (HCOOH) 氧化系统对 Darra Adam Khel Coal(巴基斯坦)的脱硫和脱灰进行了研究。通过在 70°C 下氧化 90 分钟,H 2 O 2和 HCOOH 体积各为 2 mL ,可实现约 63% 和 48% 的最大脱灰和脱硫。在作为催化剂的锡 (Sn) 存在下研究了催化氧化,该催化剂以不同形式负载,包括氯化锡 (SnCl 2 ) 水溶液、SnCl 2预浸渍在煤样上和浸渍在活性炭 (AC) 上的 Sn。催化剂以浸渍在活性炭上的形式表现出高效率,即浓度为 0.086% 的 Sn/AC。在 Aq 中存在 0.1% 的 Sn 催化剂时,最​​大脱硫率为 68.1%,脱灰率为 44.63%。形式,而在煤上预浸渍 Sn 的情况下,在 0.1% 的催化剂负载下分别达到 69.1% 和 44.6% 的最大硫和灰去除率。类似地,用作 Sn/AC 的催化剂在 0.086% 的 Sn 负载在 AC 上的浓度下实现了 82% 和 72% 的最高脱硫和脱灰。在锡 (Sn) 催化剂存在下的氧化表现出明显的优势,即在优化条件下将硫和灰分的去除率分别从 48% 和 63% 提高到最大值 82% 和 72%。煤的后催化氧化表征表明该过程对煤的性质没有负面影响,而是改善了整体煤质量。该研究为 Dara Adam Khel 煤在温和操作条件下的脱硫和脱灰提供了一种新方法,对机械和试剂的要求最低,因此可以扩展到世界其他地区发现的任何类型的煤。

缩写:AC:活性炭;ROM:我的运行;ODS:氧化脱硫;Sn/AC:锡/活性炭;SEM:扫描电子显微镜;FTIR:傅里叶变换红外辐射;ASTM:美国测试和材料体系;GCV:总热值

更新日期:2020-10-04
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