载Ni^(2+)/Fe^(3+)海泥催化污泥蒸汽气化制富氢燃气

Catalytic steam gasification of sludge by sea mud supported Ni^(2+)/Fe^(3+)catalyst to produce hydrogen-rich gas

以滩涂海泥(SM)为催化剂载体,通过共浸渍法制备了Fe^(3+)、Ni^(2+)、Ni-Fe基低负载催化剂并进行表征分析。考察了负载金属、负载率、温度等因素对污泥蒸汽气化效果的影响。结果表明:所制备催化剂的催化性能为SM-Ni-Fe-6%>SM-Ni-6%>SM-Ni-Fe-12%>SM-Fe-6%。Ni-Fe低负载SM催化剂具有优异的催化活性:在相同气化条件下,可有效提高合成气产率、H_(2)纯度及H_(2)产率;在相同H_(2)产率条件下,可显著降低气化温度。t=850℃,催化剂Ni-Fe负载率为6%时,获得最大合成气产率(0.38 m 3/kg)、H_(2)纯度(49.34%)和H_(2)产率(8.40 mol/kg),相比无催化剂(对照组)分别提高了74.77%、17.45%和105.73%。Ni-Fe基催化剂中NiFe_(2)O_(4)的形成可有效协同Fe^(3+)裂解C—O和Ni^(2+)裂解C—H,从而提升污泥气化产氢的效果。

Fe^(3+),Ni^(2+),Ni-Fe based low-loaded catalysts were prepared with sea mud(SM)as catalyst carrier,and the catalysts were characterized and analyzed.The effects of loading metals,loading ratio and temperature on sludge gasification were investigated.The results show that the rank of the catalytic performance of the prepared catalyst is SM-Ni-Fe-6%>SM-Ni-6%>SM-Ni-Fe-12%>SM-Fe-6%.SM catalyst with low-loaded ratio of Ni-Fe exhibits excellent catalytic activity.Under the same gasification conditions,the catalysts can effectively improve the syngas yield,H_(2)purity and H_(2)yield.Meanwhile,under the same H_(2)yield condition,the catalysts can significantly reduce the gasification temperature.Compared with the conditions without the catalyst,the maximum gas yield(0.38 m^(3)/kg),H_(2)purity(49.34%)and H_(2)yield(8.40 mol/kg)are obtained under the conditions of 850℃and sea mud catalyst with 6%Ni-Fe supporting ratio,and the value increases by 74.77%,17.45%and 105.73%,respectively.The formation of NiFe_(2)O_(4) in Ni-Fe based catalysts can effectively cooperate with Fe^(3+)cracking C—O and Ni^(2+)cracking C—H,thus improving the effects of hydrogen production from sludge gasification.