MeMo/USY催化剂对神东煤热解产物的调控

以USY分子筛为载体，通过等体积浸渍MoO₃、Fe₂O₃、Co₃O₄、NiO四种过渡金属氧化物，制备了Mo/USY、FeMo/USY、CoMo/USY、NiMo/USY催化剂，并借助ICP、XRD、BET、NH₃-TPD、TG等手段对催化剂进行表征。使用粉-粒流化床进行神东煤的催化热解实验，考察了过渡金属氧化物对USY的改性作用及其对热解产物的影响。结果表明：不同催化剂作用下，半焦收率基本保持在65%左右；与SiO₂相比，USY分子筛使焦油中酚类化合物含量从36.95%减少到5.08%，萘类化合物含量从8.24%增加到72.76%；与USY相比，Mo/USY使气体、液体产物的收率分别降低了4.4个百分点、30.0个百分点，萘类含量减少了18.5个百分点；Fe₂O₃、Co₃O₄、NiO对Mo/USY的改性作用明显，降低了催化剂的积炭率，提高了CH₄、C₂、C₃、CO₂的收率和气体总收率；FeMo/USY促进了产物的芳构化和萘类的生成；CoMo/USY促进了产物的芳构化反应，抑制了萘类的生成反应；NiMo/USY抑制了产物的芳构化反应、萘类的生成反应。

Regulation of Shendong coal pyrolysis products based on MeMo/USY catalyst

Four transition metal oxides, MoO₃, Fe₂O₃, Co₃O₄, and NiO, were supported on USY molecular sieves by equal volume impregnation to prepare Mo/USY, FeMo/USY, CoMo/USY and NiMo/USY catalysts, and characterized by ICP, XRD, BET, NH₃-TPD, TG. The pyrolysis experiments of Shendong coal were conducted in a powder-particle fluidized bed reactor. The results showed that the yield of the semi coke was basically around 65% with different catalysts. Compared with SiO₂, the content of phenols was reduced from 36.95% to 5.08%, and the content of naphthalenes was increased from 8.24% to 72.76% in tar by USY molecular sieve. Compared with USY molecular sieve, gas product yield, liquid product yield, and content of naphthalenes was decreased by 4.4%, 30.0% and 18.5% by Mo/USY, respectively. The effects of Fe₂O₃, Co₃O₄ and NiO on the modification of Mo/USY were obvious, which reduced the carbon accumulation rate of the catalyst and increased the yield of CH₄, C₂, C₃, CO₂ and the total gas. The aromatization of the products and the formation of naphthalenes were enhanced by FeMo/USY. The aromatization reaction of the product was enhanced, but the formation reaction of naphthalenes was inhibited by CoMo/USY. The aromatization reaction of the products and the formation reaction of naphthalenes were inhibited by NiMo/USY.