【摘要】 KHW型及CPK型两类新型含稀土的多元复合氧化物催化剂在活性、热稳定性、强度及抗=氧化硫中毒方面均已达到实用指标。和贵金属催化剂相比,其优点为原料组份资源丰富,价格便宜,并可在空燃比较低情况下具有一定活性。KHW型催化剂在高温区的活性和抗二氧化硫中毒能力略优于CPK型催化剂,并且价格极为便宜,但是热稳定性和低氧条件下的活性比CPK型略差.更多还原

【Abstract】 Two types of rare earth metal oxide catalysts KHW and CPK on G427 automobile engine has shown an average conversion of 85.4% for CO and 84.7% for hydrocarbon. It was found that α-Al₂O₃ support containing La₂O₃ or CeO₂ could improve catalytic activity and heat stability. For a gas containing 1.1% CO and the rest N₂, CO conversion still kept as high as 69% after reaction for 2hrs at 400℃. It meants the mobility of lattice oxygen was rather high and the lattice oxygen could take part in the oxidation reaction even without oxygen being conpensated to the crystal lattice for 2hrs. The CO conversion kept at 81.6% after SO₂ poisoning for 6750 min. in the case of KHW-31, and 76.1% after 3840 min for CPK-6. SO₂ poison was reversible on KHW-31. When SO₂ concentration decreased and temperature increased, the activity of the poisoned catalyst could be recovered.更多还原