Role of carboxylic acid groups in the reduction of nitric oxide by carbon at low temperature, as exemplified by graphene oxide
| Autor: | Zhi Ping Xu, Ji Zhi Zhou, Gao Qi, Jia Zhang, Qian Liu, Xiuxiu Ruan, Xiaopeng Li, Guangren Qian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Graphene Catalyst support Carboxylic acid Reactive intermediate Oxide General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nitric oxide law.invention chemistry.chemical_compound chemistry law Organic chemistry Physical and Theoretical Chemistry 0210 nano-technology Carbon Lactone Nuclear chemistry |
| Zdroj: | Physical Chemistry Chemical Physics. 19:22462-22471 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Graphene oxide (GO) was utilized to investigate the role of carboxylic acid groups in the reduction of nitric oxide (NO) for the first time. As a result, GO with sufficient carboxylic acid groups reduced 45% of NO at 100 °C. However, GO without these oxygen-containing groups barely reduced NO (lower than 5%) under the same conditions. After reduction of NO, the carboxylic acid group content on GO decreased from 8.32 to 5.22 mmol g-1. Simultaneously, the anhydride group content increased from 0.14 to 0.28 mmol g-1. FTIR spectroscopy also indicated that the carboxylic acid groups transformed into anhydride and lactone groups. Moreover, both transient kinetics and TG-MS studies demonstrated that reactive intermediates formed during the reaction between NO and GO at 100 °C. Based on these results, it was proposed that the carboxylic acid groups participated in NO reduction by consumption and regeneration. This mechanism explains why carbon is usually an effective reductant and catalyst support for NO removal at low temperature. |
| Databáze: | OpenAIRE |
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