FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Hao Bi,Zhiwei Wang,Hao Zhan,Lijian Leng,Zhiyong Zeng,Xinming Wang,Huacai Liu,Xiuli Yin,Chuangzhi Wu
Chinese herbal residue (CHR) is an association of renewable resource and hazardous waste , and high nitrogen content and low energy density are two primary obstacles to its efficient and clean thermal utilization. In this paper, acid-promoted hydrothermal was employed to probe the feasibility on CHR toward enhanced solid biofuel concerning upgradation and denitrogenation. A more excellent hydrothermal promoter (H 2 SO 4 ) was demonstrated to upgrade and denitrogenate CHR with better energy (1.125) and nitrogen densities (0.586) at optimal conditions (160 °C, 0.5 N H 2 SO 4 ), which could be attributed to the improved removal of oxygen, amino and ash during acid-promoted hydrothermal. Compared to raw feedstock or the conventional hydrochar , the acid-promoted hydrochar had enhanced compositional characteristics with higher heating value (21.00 kJ·mol −1 ), lower nitrogen (1.44 wt%) and ash (11.03 wt%) contents, thus showing more stable combustion flame with a higher comprehensive combustion index of 4.861 × 10 −8 , a higher combustion stability index of 4979.342, lower combustion alkali index of 0.026, and less nitrogen gaseous pollutant emission. Thus, acid-promoted hydrothermal would be a promising way to convert CHR into much cleaner and higher-grade solid biofuel.
研究领域:
能源与环境科学
·
生物质能工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yongtao Zhang,Fulin Chen,Yan He,Fei Wang
CO 2 sequestration based on hydrate technology is considered to be the most promising long-term CO 2 sequestration technology. In this study, a method of using initial stirring to activate CO 2 hydrate formation process was proposed in the aim of saving energy and avoiding the problem of stirring shaft stuck, where the stirring only played a role in activating hydrate formation process. Two amino acids, l -Methionine and d -leucine, were chosen as promoters for improving the formation kinetics of CO 2 hydrates, and l -Methionine presents better than d -leucine. When the concentration of l -methionine solution is equal to or greater than 4 mmol/L, even with the initial stirring of 10 rpm within 8 min, T 90 can be shortened to close to or less than 40 min with a high gas consumption of more than 7.3 mmol gas/mL water, where the promoting effect is similar to the condition of continuous stirring of about 100 min, indicating that about 90 % of the energy consumed for mechanical stirring can be saved. Moreover, an interesting phenomenon was observed that CO 2 hydrates firstly nucleated inside the l -methionine solution, and a large number of small hydrate floccules rapidly formed and filled the entire solution under the action of magnetic stirring, which proved the instantaneous excitation effect of stirring on hydrate formation. This work contributes to rethinking the promoting roles of stirring and promoters in CO 2 hydrate formation.
研究领域:
环境科学
·
能源化学
·
物理化学
·
气体水合物
·
碳捕集与封存
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Dandan Xu,Bing Zhao,Qinglong Luo,Xiao Du,Xiaogang Hao,Zhong Liu
It is a meaningful study to develop adsorbents with high adsorption capacity and fast adsorption rate for the removal of specific ions in aqueous solution. This paper mainly studies the removal of boron in aqueous solution by UiO-66. Regular octahedral structured UiO-66(HAC) via acetic acid-promoted was synthesized by a hydrothermal method. The boron adsorption kinetics, isotherms, thermodynamics, mechanism, and recycling on UiO-66(HAC) were further investigated in batch adsorption process, which found that adsorption capacity of UiO-66(HAC) is enhanced by 40% compared with UiO-66. UiO-66(HAC) exhibits great adsorption performance of 79.43 mg·g −1 at 25 °C and the adsorption process reaches equilibrium rapidly in 2 h. The selective adsorption of boron by UiO-66(HAC) is due to the presence of a large amount of Zr-OH which can chemically adsorb with boron. Compared with traditional boron removal adsorbents, UiO-66(HAC) has higher boron adsorption capacity and is easy to regenerate. It is a promising boron removal adsorbent in aqueous solution.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Current Protocols
·
2023
·Vol. 3
·期 5
·e741
·
IF 0
Wen-Wu Sun,Yi-Bing Xie,Ting-Ting Deng,Jie Huang,Ji-Kai Liu,Bin Wu
Despite the importance of nucleosides and nucleotides for drug discovery, only a few practical methods to prepare tricyclic nucleosides have been reported. Here, we describe a synthetic strategy for late-stage functionalization of nucleosides and nucleotides via chemo- and site-selective acid-promoted intermolecular cyclization. The nucleoside analogs with an additional ring were obtained in moderate-to-high yields, including some antiviral drugs (acyclovir, ganciclovir, and penciclovir) derivatives, endogenous fused ring nucleoside (M 1 dG) and its derivatives, and nucleotide derivatives. © 2023 Wiley Periodicals LLC. Basic Protocol 1 : Synthesis of tricyclic acyclovir analogs ( 3a-3c ) Basic Protocol 2 : Synthesis of tricyclic nucleosides M 1 dG ( 6 ) and M 1 G ( 9 ) Basic Protocol 3 : Synthesis of tricyclic nucleotide ( 12 )
研究领域:
药物化学
·
有机合成
·
核酸化学
·
分子生物学
·
化学生物学
·
抗病毒药物研发
✓ 已验证
DOI
危险品化学品经营许可证（带存储）