Guo, Shuai published the artcileUnveiling the mechanism of NOx precursor formation during sewage sludge pyrolysis: Effects of carbohydrate-protein interactions, Synthetic Route of 826-36-8, the publication is Journal of Environmental Chemical Engineering (2022), 10(3), 107579, database is CAplus.
Municipal sewage sludge poses environmental and health risks, and thus, requires proper disposal using pyrolytic techniques. However, these techniques are hindered by the production of NH3 and HCN (NOx precursors) by the sludge. Hence, a comprehensive understanding of NH3 and HCN formation during sludge pyrolysis is required to minimize its NOx footprint. As sludge N mainly occurs in proteins forms, its transformations can be modeled using amino acids. Here, we aimed to the study the mechanism by which carbohydrates influence the formation of NOx precursors during sludge protein pyrolysis at different temperatures using glutamic acid, tyrosine, and histidine as protein models and cellulose and lignin as carbohydrate models. During pyrolysis, the release of NH3 and HCN was promoted by high temperatures and inhibited by carbohydrates. Despite this inhibitory effect, the results suggested that the release of NH3 should be considered for samples rich in aliphatic amino acids. For glutamic acid and tyrosine, NOx precursor formation was inhibited by N fixation in coke under the action of volatiles produced during carbohydrate pyrolysis. For glutamic acid, adding cellulose and lignin increased the coke-N content by 25.32% and 44.73% at 700°C. For histidine, this effect was ascribed to the ring-opening reactions induced by the free radical products of carbohydrate decomposition and the enhanced transfer of N-containing compounds to tar after ring-opening recombination. Further, heterocyclic-N within tar increased to 69.12% due to lignin-histidine interactions at 700°C. The results of this study can assist in regulating sludge protein pyrolysis intended for minimizing the production of NOx precursors.
Journal of Environmental Chemical Engineering published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Synthetic Route of 826-36-8.
Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem