NiO-Fe_2O_3/MD催化剂的制备及其在城市生活垃圾气化中的应用

Preparation of NiO-Fe_2O_3/MD catalysts and its application in gasification of municipal solid waste

以改性白云石(Modified Dolomite,MD)为载体,利用沉积沉淀法制备了负载型NiO-Fe2O3/MD催化剂,并利用XRD、SEM、TEM、BET等手段对催化剂进行了表征和分析。同时,利用双固定床反应器对NiO-Fe2O3/MD催化剂在城市生活垃圾气化中的催化活性和使用寿命进行了评价,并与NiO/MD催化剂进行了比较。实验结果表明,NiO-Fe2O3/MD催化剂为核壳式涂层结构,表面活性颗粒粒径约为37 nm,比表面积62.48 m2/g。催化剂活性测试显示,NiO-Fe2O3/MD催化剂用于城市生活垃圾气化具有极高的催化活性,能够显著提高产品燃气品质及燃气中的H2含量,减少焦油的产生;相对于NiO/MD催化剂,其抗失活能力强,使用寿命长。

The supported NiO-Fe2O3/modified dolomite （NiO-Fe2O3/MD） catalysts were prepared by deposition-precipitation （DP）method using modified dolomite as carrier, and different approaches including XRD, SEM, TEM and BET were used to characterize the synthetic catalysts. Meanwhile, the catalytic gasification of municipal solid wastes （MSW） was conducted to test the catalytic activity and life of NiO-Fe2O3/ MD catalyst in a bench-scale combined fixed bed reactor, and compared with the catalytic properties of NiO/MD catalysts. The results indicated that the prepared NiO-Fe2O3/MD catalysts had a coated core-shell structure, the particles size of the active components in catalyst surface were about 37 nm, and they had also a high BET surface area of 62.48 m2/g. The catalytic activity testing showed that the NiO-Fe2O3/MD catalysts using in gasification of MSW had a very high catalytic activity, which could significantly improve the quality and H2 yields of the produced gas, meanwhile efficiently eliminate the tar generation. Comparing with NiO/MD catalyst, the NiO-Fe2O3/MD catalyst demonstrated its unique property in preventing deactivation to attain a longer lifetime.