Sulfur Dioxide(SO2)
The release of SO2 to the atmosphere is the primary cause of acid rain in the world.
Fossil fuel combustion at electric power-generating plants accounts for about70% of
the emissions.
Coal, Oil, and all other fossil fuels naturally
contain some sulfur.
Volcanic eruptions are another more localized natural source of SO2
SO2 + OH. HSO3.
HS
catalyst
이 방법은 ethanol을 480℃의 공기 하에서 silver catalyst를 이용하여, acetaldehyde를 생산해 내는 방법이다.
2) Wacker oxidation of ethylene
ethylene을 사용함으로써, 위에서 ethanol을 사용하는 방법에 비하여, 더욱 직접적인 방법으로 acetaldehyde를 생산해 내는 방법이다.
3) Hydration of acetaldehyde
mercury salts
catalysts
초순수 100 ml에 백금 전구체로 사용된 platinum (IV) chloride (PtCl4, Alfa Aesar) 일정량을 넣고 20분간 교반한다. 백금-킬레이트 화합물을 형성하기 위해 계산된 양의 1,3-diaminopropane을 넣는다. 이때 용액의 색은 맑은 노란색에서 탁한 색으로 변하며, 이는 백금-킬레이트 화합물이 형성되었음을 의미한
oxide gas sensors
The reason we take Nox as target gas
1. NOx is harmful to human health in its own right.
2. NOx reaction produces tropospheric ozone.
3. NOx causes acid rain, smog, and destruction of forests.
- This problems become more serious due to the rapid increase of car.
Sensitivity
▪ Temperature
▪ Catalyst
▪ Large surface area
▪ Low carrier co
:
Maximum 200°C/min
*Separate Electric furnace and other system like Electronic scale
-Because Electric furnace temperature is very high
so we need to protect other system.
instrument composition
-Electric furnace
Temperature range:
25°C~1500°C
Heat speed :
Maximum 200°C/min
*Nitrogen or Argon in Electric furnace
-Because the inhibition of oxidization of sample