阿拉丁SCI论文搜索工具

Journal of Environmental Sciences · 2019 · IF 3.556

Deactivation of Cu-SAPO-34 by urea-related deposits at low temperatures and the regeneration

Yue Ma,Xiaodong Wu,Junyu Zhang,Rui Ran,Zhichun Si,Duan Weng

Selective catalytic reduction (SCR) with urea catalyzed by Cu-SAPO-34 is an effective method to eliminate NO x from diesel exhaust . However, urea-related deposits may form during cold-start and urban driving due to low exhaust temperatures. The activity of Cu-SAPO-34 at 175°C is significantly degraded by urea exposure, and 300°C is required for regeneration. Through in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed hydrolysis studies, the dominant stable deposit at 175°C is identified as biuret, which can be eliminated at 300°C. The urea-derived deactivation and regeneration mechanisms of Cu-SAPO-34 were compared with those of anatase-supported catalysts.

CAS / MDL: 108-80-5

研究领域: 催化 · 环境工程 · 化学工程

✓ 已验证产品关联 DOI PubMed 高影响因子

查看原文查看 PubMed

JOURNAL OF CULTURAL HERITAGE · 2023 · IF 3.1

A new proposed semi-quantitative method for the organic additives analysis in traditional lime mortar

Kuanrong Zhai,Bingjian Zhang,Longguan Zhu

To improve the performance of lime mortar, ancient craftsmen often added various additives to mortars, including inorganic and organic materials. The analysis of mortar additives plays an important role in the conservation and restoration of historical buildings. However, it is quite difficult to accurately identify the species of additives. This paper proposed a series of semi-quantitative analytical procedures to identify the organic additives in ancient lime mortars. By using reagents such as phenolphthalein, periodic acid, acetylacetone, anthrone, bicinchoninic acid (BCA), iodine-potassium iodide, chloramine T, etc., organic additives such as triglyceride, soluble sugar, starch, and protein (including blood, gelatine, and other unknown proteins) remaining in ancient lime mortar were accurately detected, respectively. The linear relationship of the standard curve was significant, and the detection limits for the target additives were below 7 µg/mL. The process is easy to operate within 6 h, and it is suitable for rapid in-situ testing.

CAS / MDL: 979-88-4 7758-98-7 142-82-5 7553-56-2 7681-11-0 868-18-8

研究领域: 建筑保护 · 材料科学 · 化学分析

✓ 已验证产品关联 DOI 高影响因子

查看原文查看 PubMed

查找使用阿拉丁产品的科研文献

与阿拉丁产品相关的已发表科研成果

热门产品

Deactivation of Cu-SAPO-34 by urea-related deposits at low temperatures and the regeneration

A new proposed semi-quantitative method for the organic additives analysis in traditional lime mortar