yasamin bide

The possibility of releasing unburned hydrocarbons and other compounds resulting from incomplete combustion from the exhaust is considered a common industrial issue. Pathing the exhaust gas through catalysts is a common way to lower the emissions. Alternatively, catalytic flameless combustion, used in a wide range of dilute air-fuel mixtures due to its optimal performance, is of interest for local radiative heating applications because of its low emission and high combustion efficiency (over 90%). However, using platinum catalysts in these systems increases production costs, and its surface temperature, ranging from 400-600 °C, faces a temperature limit in some applications. In this study, the feasibility of using a Pd-Au catalyst, with lower temperature and production costs, in a flameless catalytic counter-diffusive system was experimentally evaluated for the first time to reduce pollutants. A methane conversion rate of 98.3% in the 200-250 °C temperature range and a long life without CO and NOx pollutants were observed. This not only leads to reducing environmental pollutants, but by producing low-temperature radiant heat, it also provides the possibility of producing heat from exhaust gases, making it a dual-function solution in the field.

Due to their high polarity andsolubility in water these acidic herbicides can be released from harvest fields and therefore pollute surface and ground waters. The World Health Organization (WHO) regulations set 70 ng mL−1 as the maximum contaminant level (MCL) of phenoxy acid herbicidesin drinking water [2]. Therefore، the presence of these chemicals inwater sources is highly objectionable for human and animal consumption. Due to the fact that the major sources of drinking water are ground water and river water، monitoring the acidic and polar herbicides in these water sources is quite necessary. Therefore، in this study، we focused on introducing a novel microgel sorbent in which the adsorption and desorption of analytes are controlled only by changing the pH value of the sample. To the best of our knowledge، it is the first report on employing a pH-sensitive magnetic microgel as a new sorbent. In order to increase the adsorption efficiency and rapidly separatethe sorbent from the sample matrix by an external magnetic field، microgel was grafted on magnetic nanoparticles. Finally، the optimized procedure was employed to determine these phenoxy acid herbicides in river water samples.