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采用碳酸铵共沉淀法制备六铝酸盐为涂层、以γ-Al2O3为载体、负载Pd活性组分的煤矿乏风低浓度瓦斯燃烧催化剂。采用自行设计的固定床单管试验仪,考察了催化剂的活性、水热稳定性及抗硫中毒能力。结果表明:以La0.5Sr0.5MnAl11O19为涂层的催化剂活性最高;氧化铝涂覆六铝酸盐后,在维持相同甲烷燃烧的情况下,Pd负载量可以大幅度下降,说明氧化铝经六铝酸盐改性后可以节约贵金属的用量;以六铝酸盐作为涂层的氧化铝催化剂具有很好的热稳定性和抗烧结性能;煤矿的潮湿环境对所制备的负载Pd催化剂影响有限,并且这种影响是可逆的,对于连续的甲烷催化燃烧过程,通风瓦斯水蒸气的影响可以忽略;氧化铝经六铝酸盐修饰后再负载Pd催化剂,其抗硫中毒能力明显增强。
A catalyst for the gas-free and low-concentration gas combustion of coal mine with Pd active component supported on γ-Al2O3 by using ammonium carbonate coprecipitation method was prepared. Using self-designed fixed bed tube tester, the activity of the catalyst, hydrothermal stability and anti-sulfur poisoning ability were investigated. The results show that the catalyst with La0.5Sr0.5MnAl11O19 as the coating has the highest activity. After the aluminate is coated with hexaaluminate, the loading of Pd can be greatly decreased with the same methane combustion, The modification of acid salts can save the amount of precious metals. The aluminate catalyst coated with hexaaluminate has good thermal stability and sintering resistance. The humid environment of coal mine has a limited impact on the prepared Pd catalyst. This effect is reversible. For the continuous methane catalytic combustion process, the influence of ventilation gas vapor can be neglected. Alumina modified with hexaaluminate and then loaded with Pd catalyst has a significantly enhanced anti-sulfur poisoning ability.