Abstract To enhance the catalytic effect of dolomite, La/Dol catalyst was prepared by impregnation modification of dolomite with La (NO3)3 as additive. The catalyst was characterized by BET, SEM and XRD. With pine rods as raw materials and La/Dolas reforming catalysts, the effects of gasification temperature and La amount of catalysts on the catalytic gasification of pine were compared and analyzed in a self-made two-stage biomass gasification reforming experimental furnace. The results show that a small amount of La (2%) can obviously promote the forward progress of water gas reaction and perfect the catalytic reforming effect. Under the working condition of steam flow rate of 10 g/min, 2-La/Dol catalyst and reforming temperature of 750°C, with the increase of gasification temperature, the amount of H2 increases significantly, and the highest volume fraction of H2 increases from 28.51% (0-La/Dol) to 41.72% (2-La/Dol). La2O3 in the catalyst promotes the secondary cracking of tar. As a result, the tar content of liquid phase product is obviously reduced, and the number of functional groups is also reduced. La2O3 on dolomite surface occupies active sites, so carbon filaments are not suitable for accumulation and carbon deposition is inhibited. Carbonate (La2O2CO3) in the catalyst can react with carbon to slow down the carbon deposition on the surface and improve the activity and service life of the catalyst.

中文翻译：

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负载镧白云石催化剂松催化气化性能研究

摘要 为提高白云石的催化效果，以La(NO3)3为添加剂，对白云石进行浸渍改性制备了La/Dol催化剂。通过BET、SEM和XRD对催化剂进行了表征。以松杆为原料，La/Dolas重整催化剂，在自制的两级生物质气化重整实验炉中，对比分析了气化温度和催化剂La量对松木催化气化的影响。结果表明，少量的La（2%）可以明显促进水煤气反应的向前进行，完善催化重整效果。在蒸汽流量10 g/min、2-La/Dol催化剂、重整温度750℃的工况下，随着气化温度的升高，H2的量显着增加，H2 的最高体积分数从 28.51% (0-La/Dol) 增加到 41.72% (2-La/Dol)。催化剂中的La2O3促进了焦油的二次裂解。结果，液相产物的焦油含量明显降低，官能团的数目也减少了。白云石表面的La2O3占据活性位点，因此碳丝不适合堆积，抑制了碳的沉积。催化剂中的碳酸盐（La2O2CO3）可以与碳发生反应，减缓碳在表面的沉积，提高催化剂的活性和使用寿命。白云石表面的La2O3占据活性位点，因此碳丝不适合堆积，抑制了碳的沉积。催化剂中的碳酸盐（La2O2CO3）可以与碳发生反应，减缓碳在表面的沉积，提高催化剂的活性和使用寿命。白云石表面的La2O3占据活性位点，因此碳丝不适合堆积，抑制了碳的沉积。催化剂中的碳酸盐（La2O2CO3）可以与碳发生反应，减缓碳在表面的沉积，提高催化剂的活性和使用寿命。